#[vertex]

#version 450

#VERSION_DEFINES

#include "scene_forward_clustered_inc.glsl"

#define SHADER_IS_SRGB false
#define SHADER_SPACE_FAR 0.0

/* INPUT ATTRIBS */

// Always contains vertex position in XYZ, can contain tangent angle in W.
layout(location = 0) in vec4 vertex_angle_attrib;

//only for pure render depth when normal is not used

#if defined(NORMAL_USED) || defined(TANGENT_USED)
// Contains Normal/Axis in RG, can contain tangent in BA.
layout(location = 1) in vec4 axis_tangent_attrib;
#endif

// Location 2 is unused.

#if defined(COLOR_USED)
layout(location = 3) in vec4 color_attrib;
#endif

#ifdef UV_USED
layout(location = 4) in vec2 uv_attrib;
#endif

#if defined(UV2_USED) || defined(USE_LIGHTMAP) || defined(MODE_RENDER_MATERIAL)
layout(location = 5) in vec2 uv2_attrib;
#endif

#if defined(CUSTOM0_USED)
layout(location = 6) in vec4 custom0_attrib;
#endif

#if defined(CUSTOM1_USED)
layout(location = 7) in vec4 custom1_attrib;
#endif

#if defined(CUSTOM2_USED)
layout(location = 8) in vec4 custom2_attrib;
#endif

#if defined(CUSTOM3_USED)
layout(location = 9) in vec4 custom3_attrib;
#endif

#if defined(BONES_USED) || defined(USE_PARTICLE_TRAILS)
layout(location = 10) in uvec4 bone_attrib;
#endif

#if defined(WEIGHTS_USED) || defined(USE_PARTICLE_TRAILS)
layout(location = 11) in vec4 weight_attrib;
#endif

#ifdef MOTION_VECTORS
layout(location = 12) in vec4 previous_vertex_attrib;

#if defined(NORMAL_USED) || defined(TANGENT_USED)
layout(location = 13) in vec4 previous_normal_attrib;
#endif

#endif // MOTION_VECTORS

vec3 oct_to_vec3(vec2 e) {
	vec3 v = vec3(e.xy, 1.0 - abs(e.x) - abs(e.y));
	float t = max(-v.z, 0.0);
	v.xy += t * -sign(v.xy);
	return normalize(v);
}

void axis_angle_to_tbn(vec3 axis, float angle, out vec3 tangent, out vec3 binormal, out vec3 normal) {
	float c = cos(angle);
	float s = sin(angle);
	vec3 omc_axis = (1.0 - c) * axis;
	vec3 s_axis = s * axis;
	tangent = omc_axis.xxx * axis + vec3(c, -s_axis.z, s_axis.y);
	binormal = omc_axis.yyy * axis + vec3(s_axis.z, c, -s_axis.x);
	normal = omc_axis.zzz * axis + vec3(-s_axis.y, s_axis.x, c);
}

/* Varyings */

layout(location = 0) out vec3 vertex_interp;

#ifdef NORMAL_USED
layout(location = 1) out vec3 normal_interp;
#endif

#if defined(COLOR_USED)
layout(location = 2) out vec4 color_interp;
#endif

#ifdef UV_USED
layout(location = 3) out vec2 uv_interp;
#endif

#if defined(UV2_USED) || defined(USE_LIGHTMAP)
layout(location = 4) out vec2 uv2_interp;
#endif

#ifdef TANGENT_USED
layout(location = 5) out vec3 tangent_interp;
layout(location = 6) out vec3 binormal_interp;
#endif

#ifdef MOTION_VECTORS
layout(location = 7) out vec4 screen_position;
layout(location = 8) out vec4 prev_screen_position;
#endif

#ifdef MATERIAL_UNIFORMS_USED
/* clang-format off */
layout(set = MATERIAL_UNIFORM_SET, binding = 0, std140) uniform MaterialUniforms {
#MATERIAL_UNIFORMS
} material;
/* clang-format on */
#endif

float global_time;

#ifdef MODE_DUAL_PARABOLOID

layout(location = 9) out float dp_clip;

#endif

layout(location = 10) out flat uint instance_index_interp;

#ifdef USE_MULTIVIEW
#ifdef has_VK_KHR_multiview
#define ViewIndex gl_ViewIndex
#else // has_VK_KHR_multiview
// !BAS! This needs to become an input once we implement our fallback!
#define ViewIndex 0
#endif // has_VK_KHR_multiview
vec3 multiview_uv(vec2 uv) {
	return vec3(uv, ViewIndex);
}
ivec3 multiview_uv(ivec2 uv) {
	return ivec3(uv, int(ViewIndex));
}
layout(location = 11) out vec4 combined_projected;
#else // USE_MULTIVIEW
// Set to zero, not supported in non stereo
#define ViewIndex 0
vec2 multiview_uv(vec2 uv) {
	return uv;
}
ivec2 multiview_uv(ivec2 uv) {
	return uv;
}

#endif //USE_MULTIVIEW

#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED) && defined(USE_VERTEX_LIGHTING)
layout(location = 12) highp out vec4 diffuse_light_interp;
layout(location = 13) highp out vec4 specular_light_interp;

#include "../scene_forward_vertex_lights_inc.glsl"

void cluster_get_item_range(uint p_offset, out uint item_min, out uint item_max, out uint item_from, out uint item_to) {
	uint item_min_max = cluster_buffer.data[p_offset];
	item_min = item_min_max & 0xFFFFu;
	item_max = item_min_max >> 16;

	item_from = item_min >> 5;
	item_to = (item_max == 0) ? 0 : ((item_max - 1) >> 5) + 1; //side effect of how it is stored, as item_max 0 means no elements
}

uint cluster_get_range_clip_mask(uint i, uint z_min, uint z_max) {
	int local_min = clamp(int(z_min) - int(i) * 32, 0, 31);
	int mask_width = min(int(z_max) - int(z_min), 32 - local_min);
	return bitfieldInsert(uint(0), uint(0xFFFFFFFF), local_min, mask_width);
}
#endif // !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED) && defined(USE_VERTEX_LIGHTING)
invariant gl_Position;

#GLOBALS

#ifdef USE_DOUBLE_PRECISION
// Helper functions for emulating double precision when adding floats.
vec3 quick_two_sum(vec3 a, vec3 b, out vec3 out_p) {
	vec3 s = a + b;
	out_p = b - (s - a);
	return s;
}

vec3 two_sum(vec3 a, vec3 b, out vec3 out_p) {
	vec3 s = a + b;
	vec3 v = s - a;
	out_p = (a - (s - v)) + (b - v);
	return s;
}

vec3 double_add_vec3(vec3 base_a, vec3 prec_a, vec3 base_b, vec3 prec_b, out vec3 out_precision) {
	vec3 s, t, se, te;
	s = two_sum(base_a, base_b, se);
	t = two_sum(prec_a, prec_b, te);
	se += t;
	s = quick_two_sum(s, se, se);
	se += te;
	s = quick_two_sum(s, se, out_precision);
	return s;
}
#endif

uint multimesh_stride() {
	uint stride = sc_multimesh_format_2d() ? 2 : 3;
	stride += sc_multimesh_has_color() ? 1 : 0;
	stride += sc_multimesh_has_custom_data() ? 1 : 0;
	return stride;
}

void vertex_shader(vec3 vertex_input,
#ifdef NORMAL_USED
		in vec3 normal_input,
#endif
#ifdef TANGENT_USED
		in vec3 tangent_input,
		in vec3 binormal_input,
#endif
		in uint instance_index, in uint multimesh_offset, in SceneData scene_data, in mat4 model_matrix, out vec4 screen_pos) {
	vec4 instance_custom = vec4(0.0);
#if defined(COLOR_USED)
	color_interp = color_attrib;
#endif

	mat4 inv_view_matrix = scene_data.inv_view_matrix;

#ifdef USE_DOUBLE_PRECISION
	vec3 model_precision = vec3(model_matrix[0][3], model_matrix[1][3], model_matrix[2][3]);
	model_matrix[0][3] = 0.0;
	model_matrix[1][3] = 0.0;
	model_matrix[2][3] = 0.0;
	vec3 view_precision = vec3(inv_view_matrix[0][3], inv_view_matrix[1][3], inv_view_matrix[2][3]);
	inv_view_matrix[0][3] = 0.0;
	inv_view_matrix[1][3] = 0.0;
	inv_view_matrix[2][3] = 0.0;
#endif

	mat3 model_normal_matrix;
	if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_NON_UNIFORM_SCALE)) {
		model_normal_matrix = transpose(inverse(mat3(model_matrix)));
	} else {
		model_normal_matrix = mat3(model_matrix);
	}

	mat4 matrix;
	mat4 read_model_matrix = model_matrix;

	if (sc_multimesh()) {
		//multimesh, instances are for it

#ifdef USE_PARTICLE_TRAILS
		uint trail_size = (instances.data[instance_index].flags >> INSTANCE_FLAGS_PARTICLE_TRAIL_SHIFT) & INSTANCE_FLAGS_PARTICLE_TRAIL_MASK;
		uint stride = 3 + 1 + 1; //particles always uses this format

		uint offset = trail_size * stride * gl_InstanceIndex;

#ifdef COLOR_USED
		vec4 pcolor;
#endif
		{
			uint boffset = offset + bone_attrib.x * stride;
			matrix = mat4(transforms.data[boffset + 0], transforms.data[boffset + 1], transforms.data[boffset + 2], vec4(0.0, 0.0, 0.0, 1.0)) * weight_attrib.x;
#ifdef COLOR_USED
			pcolor = transforms.data[boffset + 3] * weight_attrib.x;
#endif
		}
		if (weight_attrib.y > 0.001) {
			uint boffset = offset + bone_attrib.y * stride;
			matrix += mat4(transforms.data[boffset + 0], transforms.data[boffset + 1], transforms.data[boffset + 2], vec4(0.0, 0.0, 0.0, 1.0)) * weight_attrib.y;
#ifdef COLOR_USED
			pcolor += transforms.data[boffset + 3] * weight_attrib.y;
#endif
		}
		if (weight_attrib.z > 0.001) {
			uint boffset = offset + bone_attrib.z * stride;
			matrix += mat4(transforms.data[boffset + 0], transforms.data[boffset + 1], transforms.data[boffset + 2], vec4(0.0, 0.0, 0.0, 1.0)) * weight_attrib.z;
#ifdef COLOR_USED
			pcolor += transforms.data[boffset + 3] * weight_attrib.z;
#endif
		}
		if (weight_attrib.w > 0.001) {
			uint boffset = offset + bone_attrib.w * stride;
			matrix += mat4(transforms.data[boffset + 0], transforms.data[boffset + 1], transforms.data[boffset + 2], vec4(0.0, 0.0, 0.0, 1.0)) * weight_attrib.w;
#ifdef COLOR_USED
			pcolor += transforms.data[boffset + 3] * weight_attrib.w;
#endif
		}

		instance_custom = transforms.data[offset + 4];

#ifdef COLOR_USED
		color_interp *= pcolor;
#endif

#else
		uint stride = multimesh_stride();
		uint offset = stride * (gl_InstanceIndex + multimesh_offset);

		if (sc_multimesh_format_2d()) {
			matrix = mat4(transforms.data[offset + 0], transforms.data[offset + 1], vec4(0.0, 0.0, 1.0, 0.0), vec4(0.0, 0.0, 0.0, 1.0));
			offset += 2;
		} else {
			matrix = mat4(transforms.data[offset + 0], transforms.data[offset + 1], transforms.data[offset + 2], vec4(0.0, 0.0, 0.0, 1.0));
			offset += 3;
		}

		if (sc_multimesh_has_color()) {
#ifdef COLOR_USED
			color_interp *= transforms.data[offset];
#endif
			offset += 1;
		}

		if (sc_multimesh_has_custom_data()) {
			instance_custom = transforms.data[offset];
		}

#endif
		//transpose
		matrix = transpose(matrix);
#if !defined(USE_DOUBLE_PRECISION) || defined(SKIP_TRANSFORM_USED) || defined(VERTEX_WORLD_COORDS_USED) || defined(MODEL_MATRIX_USED)
		// Normally we can bake the multimesh transform into the model matrix, but when using double precision
		// we avoid baking it in so we can emulate high precision.
		read_model_matrix = model_matrix * matrix;
#if !defined(USE_DOUBLE_PRECISION) || defined(SKIP_TRANSFORM_USED) || defined(VERTEX_WORLD_COORDS_USED)
		model_matrix = read_model_matrix;
#endif // !defined(USE_DOUBLE_PRECISION) || defined(SKIP_TRANSFORM_USED) || defined(VERTEX_WORLD_COORDS_USED)
#endif // !defined(USE_DOUBLE_PRECISION) || defined(SKIP_TRANSFORM_USED) || defined(VERTEX_WORLD_COORDS_USED) || defined(MODEL_MATRIX_USED)
		model_normal_matrix = model_normal_matrix * mat3(matrix);
	}

	vec3 vertex = vertex_input;
#ifdef NORMAL_USED
	vec3 normal = normal_input;
#endif

#ifdef TANGENT_USED
	vec3 tangent = tangent_input;
	vec3 binormal = binormal_input;
#endif

#ifdef UV_USED
	uv_interp = uv_attrib;
#endif

#if defined(UV2_USED) || defined(USE_LIGHTMAP)
	uv2_interp = uv2_attrib;
#endif

	vec4 uv_scale = instances.data[instance_index].uv_scale;

	if (uv_scale != vec4(0.0)) { // Compression enabled
#ifdef UV_USED
		uv_interp = (uv_interp - 0.5) * uv_scale.xy;
#endif
#if defined(UV2_USED) || defined(USE_LIGHTMAP)
		uv2_interp = (uv2_interp - 0.5) * uv_scale.zw;
#endif
	}

#ifdef OVERRIDE_POSITION
	vec4 position = vec4(1.0);
#endif

#ifdef USE_MULTIVIEW
	mat4 combined_projection = scene_data.projection_matrix;
	mat4 projection_matrix = scene_data.projection_matrix_view[ViewIndex];
	mat4 inv_projection_matrix = scene_data.inv_projection_matrix_view[ViewIndex];
	vec3 eye_offset = scene_data.eye_offset[ViewIndex].xyz;
#else
	mat4 projection_matrix = scene_data.projection_matrix;
	mat4 inv_projection_matrix = scene_data.inv_projection_matrix;
	vec3 eye_offset = vec3(0.0, 0.0, 0.0);
#endif //USE_MULTIVIEW

//using world coordinates
#if !defined(SKIP_TRANSFORM_USED) && defined(VERTEX_WORLD_COORDS_USED)

	vertex = (model_matrix * vec4(vertex, 1.0)).xyz;

#ifdef NORMAL_USED
	normal = model_normal_matrix * normal;
#endif

#ifdef TANGENT_USED

	tangent = model_normal_matrix * tangent;
	binormal = model_normal_matrix * binormal;

#endif
#endif

	float roughness = 1.0;

	mat4 modelview = scene_data.view_matrix * model_matrix;
	mat3 modelview_normal = mat3(scene_data.view_matrix) * model_normal_matrix;
	mat4 read_view_matrix = scene_data.view_matrix;
	vec2 read_viewport_size = scene_data.viewport_size;

	{
#CODE : VERTEX
	}

// using local coordinates (default)
#if !defined(SKIP_TRANSFORM_USED) && !defined(VERTEX_WORLD_COORDS_USED)

#ifdef USE_DOUBLE_PRECISION
	// We separate the basis from the origin because the basis is fine with single point precision.
	// Then we combine the translations from the model matrix and the view matrix using emulated doubles.
	// We add the result to the vertex and ignore the final lost precision.
	vec3 model_origin = model_matrix[3].xyz;
	if (sc_multimesh()) {
		vertex = mat3(matrix) * vertex;
		model_origin = double_add_vec3(model_origin, model_precision, matrix[3].xyz, vec3(0.0), model_precision);
	}
	vertex = mat3(inv_view_matrix * modelview) * vertex;
	vec3 temp_precision; // Will be ignored.
	vertex += double_add_vec3(model_origin, model_precision, scene_data.inv_view_matrix[3].xyz, view_precision, temp_precision);
	vertex = mat3(scene_data.view_matrix) * vertex;
#else
	vertex = (modelview * vec4(vertex, 1.0)).xyz;
#endif
#ifdef NORMAL_USED
	normal = modelview_normal * normal;
#endif

#ifdef TANGENT_USED

	binormal = modelview_normal * binormal;
	tangent = modelview_normal * tangent;
#endif
#endif // !defined(SKIP_TRANSFORM_USED) && !defined(VERTEX_WORLD_COORDS_USED)

//using world coordinates
#if !defined(SKIP_TRANSFORM_USED) && defined(VERTEX_WORLD_COORDS_USED)

	vertex = (scene_data.view_matrix * vec4(vertex, 1.0)).xyz;
#ifdef NORMAL_USED
	normal = (scene_data.view_matrix * vec4(normal, 0.0)).xyz;
#endif

#ifdef TANGENT_USED
	binormal = (scene_data.view_matrix * vec4(binormal, 0.0)).xyz;
	tangent = (scene_data.view_matrix * vec4(tangent, 0.0)).xyz;
#endif
#endif

	vertex_interp = vertex;

	// Normalize TBN vectors before interpolation, per MikkTSpace.
	// See: http://www.mikktspace.com/
#ifdef NORMAL_USED
	normal_interp = normalize(normal);
#endif

#ifdef TANGENT_USED
	tangent_interp = normalize(tangent);
	binormal_interp = normalize(binormal);
#endif

#ifdef MODE_RENDER_DEPTH

#ifdef MODE_DUAL_PARABOLOID

	vertex_interp.z *= scene_data.dual_paraboloid_side;

	dp_clip = vertex_interp.z; //this attempts to avoid noise caused by objects sent to the other parabolloid side due to bias

	//for dual paraboloid shadow mapping, this is the fastest but least correct way, as it curves straight edges

	vec3 vtx = vertex_interp;
	float distance = length(vtx);
	vtx = normalize(vtx);
	vtx.xy /= 1.0 - vtx.z;
	vtx.z = (distance / scene_data.z_far);
	vtx.z = vtx.z * 2.0 - 1.0;
	vertex_interp = vtx;

#endif

#endif //MODE_RENDER_DEPTH

#ifdef OVERRIDE_POSITION
	gl_Position = position;
#else
	gl_Position = projection_matrix * vec4(vertex_interp, 1.0);
#endif

#ifdef USE_MULTIVIEW
	combined_projected = combined_projection * vec4(vertex_interp, 1.0);
#endif

#ifdef MOTION_VECTORS
	screen_pos = gl_Position;
#endif

#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED) && defined(USE_VERTEX_LIGHTING)
	diffuse_light_interp = vec4(0.0);
	specular_light_interp = vec4(0.0);

#ifdef USE_MULTIVIEW
	vec3 view = -normalize(vertex_interp - eye_offset);
	vec2 clip_pos = clamp((combined_projected.xy / combined_projected.w) * 0.5 + 0.5, 0.0, 1.0);
#else
	vec3 view = -normalize(vertex_interp);
	vec2 clip_pos = clamp((gl_Position.xy / gl_Position.w) * 0.5 + 0.5, 0.0, 1.0);
#endif

	uvec2 cluster_pos = uvec2(clip_pos / scene_data.screen_pixel_size) >> implementation_data.cluster_shift;
	uint cluster_offset = (implementation_data.cluster_width * cluster_pos.y + cluster_pos.x) * (implementation_data.max_cluster_element_count_div_32 + 32);
	uint cluster_z = uint(clamp((-vertex_interp.z / scene_data.z_far) * 32.0, 0.0, 31.0));

	{ //omni lights

		uint cluster_omni_offset = cluster_offset;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_omni_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_omni_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
			uint merged_mask = mask;

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);
				uint light_index = 32 * i + bit;

				if (!bool(omni_lights.data[light_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (omni_lights.data[light_index].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
					continue; // Statically baked light and object uses lightmap, skip
				}

				light_process_omni_vertex(light_index, vertex, view, normal, roughness,
						diffuse_light_interp.rgb, specular_light_interp.rgb);
			}
		}
	}

	{ //spot lights
		uint cluster_spot_offset = cluster_offset + implementation_data.cluster_type_size;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_spot_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_spot_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
			uint merged_mask = mask;

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);

				uint light_index = 32 * i + bit;

				if (!bool(spot_lights.data[light_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (spot_lights.data[light_index].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
					continue; // Statically baked light and object uses lightmap, skip
				}

				light_process_spot_vertex(light_index, vertex, view, normal, roughness,
						diffuse_light_interp.rgb, specular_light_interp.rgb);
			}
		}
	}

	{ // Directional light.

		// We process the first directional light separately as it may have shadows.
		vec3 directional_diffuse = vec3(0.0);
		vec3 directional_specular = vec3(0.0);

		for (uint i = 0; i < scene_data.directional_light_count; i++) {
			if (!bool(directional_lights.data[i].mask & instances.data[draw_call.instance_index].layer_mask)) {
				continue; // Not masked, skip.
			}

			if (directional_lights.data[i].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[draw_call.instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
				continue; // Statically baked light and object uses lightmap, skip.
			}
			if (i == 0) {
				light_compute_vertex(normal, directional_lights.data[0].direction, view,
						directional_lights.data[0].color * directional_lights.data[0].energy,
						true, roughness,
						directional_diffuse,
						directional_specular);
			} else {
				light_compute_vertex(normal, directional_lights.data[i].direction, view,
						directional_lights.data[i].color * directional_lights.data[i].energy,
						true, roughness,
						diffuse_light_interp.rgb,
						specular_light_interp.rgb);
			}
		}

		// Calculate the contribution from the shadowed light so we can scale the shadows accordingly.
		float diff_avg = dot(diffuse_light_interp.rgb, vec3(0.33333));
		float diff_dir_avg = dot(directional_diffuse, vec3(0.33333));
		if (diff_avg > 0.0) {
			diffuse_light_interp.a = diff_dir_avg / (diff_avg + diff_dir_avg);
		} else {
			diffuse_light_interp.a = 1.0;
		}

		diffuse_light_interp.rgb += directional_diffuse;

		float spec_avg = dot(specular_light_interp.rgb, vec3(0.33333));
		float spec_dir_avg = dot(directional_specular, vec3(0.33333));
		if (spec_avg > 0.0) {
			specular_light_interp.a = spec_dir_avg / (spec_avg + spec_dir_avg);
		} else {
			specular_light_interp.a = 1.0;
		}

		specular_light_interp.rgb += directional_specular;
	}

#endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED) && defined(USE_VERTEX_LIGHTING)

#ifdef MODE_RENDER_DEPTH
	if (scene_data.pancake_shadows) {
		if (gl_Position.z >= 0.9999) {
			gl_Position.z = 0.9999;
		}
	}
#endif
#ifdef MODE_RENDER_MATERIAL
	if (scene_data.material_uv2_mode) {
		vec2 uv_dest_attrib;
		if (uv_scale != vec4(0.0)) {
			uv_dest_attrib = (uv2_attrib.xy - 0.5) * uv_scale.zw;
		} else {
			uv_dest_attrib = uv2_attrib.xy;
		}

		vec2 uv_offset = unpackHalf2x16(draw_call.uv_offset);
		gl_Position.xy = (uv_dest_attrib + uv_offset) * 2.0 - 1.0;
		gl_Position.z = 0.00001;
		gl_Position.w = 1.0;
	}
#endif
}

void _unpack_vertex_attributes(vec4 p_vertex_in, vec3 p_compressed_aabb_position, vec3 p_compressed_aabb_size,
#if defined(NORMAL_USED) || defined(TANGENT_USED)
		vec4 p_normal_in,
#ifdef NORMAL_USED
		out vec3 r_normal,
#endif
		out vec3 r_tangent,
		out vec3 r_binormal,
#endif
		out vec3 r_vertex) {

	r_vertex = p_vertex_in.xyz * p_compressed_aabb_size + p_compressed_aabb_position;
#ifdef NORMAL_USED
	r_normal = oct_to_vec3(p_normal_in.xy * 2.0 - 1.0);
#endif

#if defined(NORMAL_USED) || defined(TANGENT_USED)

	float binormal_sign;

	// This works because the oct value (0, 1) maps onto (0, 0, -1) which encodes to (1, 1).
	// Accordingly, if p_normal_in.z contains octahedral values, it won't equal (0, 1).
	if (p_normal_in.z > 0.0 || p_normal_in.w < 1.0) {
		// Uncompressed format.
		vec2 signed_tangent_attrib = p_normal_in.zw * 2.0 - 1.0;
		r_tangent = oct_to_vec3(vec2(signed_tangent_attrib.x, abs(signed_tangent_attrib.y) * 2.0 - 1.0));
		binormal_sign = sign(signed_tangent_attrib.y);
		r_binormal = normalize(cross(r_normal, r_tangent) * binormal_sign);
	} else {
		// Compressed format.
		float angle = p_vertex_in.w;
		binormal_sign = angle > 0.5 ? 1.0 : -1.0; // 0.5 does not exist in UNORM16, so values are either greater or smaller.
		angle = abs(angle * 2.0 - 1.0) * M_PI; // 0.5 is basically zero, allowing to encode both signs reliably.
		vec3 axis = r_normal;
		axis_angle_to_tbn(axis, angle, r_tangent, r_binormal, r_normal);
		r_binormal *= binormal_sign;
	}
#endif
}

void main() {
	uint instance_index = draw_call.instance_index;
	if (!sc_multimesh()) {
		instance_index += gl_InstanceIndex;
	}

	instance_index_interp = instance_index;

	mat4 model_matrix = instances.data[instance_index].transform;

#ifdef MOTION_VECTORS
	// Previous vertex.
	vec3 prev_vertex;
#ifdef NORMAL_USED
	vec3 prev_normal;
#endif
#if defined(NORMAL_USED) || defined(TANGENT_USED)
	vec3 prev_tangent;
	vec3 prev_binormal;
#endif

	_unpack_vertex_attributes(
			previous_vertex_attrib,
			instances.data[instance_index].compressed_aabb_position_pad.xyz,
			instances.data[instance_index].compressed_aabb_size_pad.xyz,

#if defined(NORMAL_USED) || defined(TANGENT_USED)
			previous_normal_attrib,
#ifdef NORMAL_USED
			prev_normal,
#endif
			prev_tangent,
			prev_binormal,
#endif
			prev_vertex);

	global_time = scene_data_block.prev_data.time;
	vertex_shader(prev_vertex,
#ifdef NORMAL_USED
			prev_normal,
#endif
#ifdef TANGENT_USED
			prev_tangent,
			prev_binormal,
#endif
			instance_index, draw_call.multimesh_motion_vectors_previous_offset, scene_data_block.prev_data, instances.data[instance_index].prev_transform, prev_screen_position);
#else
	// Unused output.
	vec4 screen_position;
#endif

	vec3 vertex;
#ifdef NORMAL_USED
	vec3 normal;
#endif
#if defined(NORMAL_USED) || defined(TANGENT_USED)
	vec3 tangent;
	vec3 binormal;
#endif

	_unpack_vertex_attributes(
			vertex_angle_attrib,
			instances.data[instance_index].compressed_aabb_position_pad.xyz,
			instances.data[instance_index].compressed_aabb_size_pad.xyz,
#if defined(NORMAL_USED) || defined(TANGENT_USED)
			axis_tangent_attrib,
#ifdef NORMAL_USED
			normal,
#endif
			tangent,
			binormal,
#endif
			vertex);

	// Current vertex.
	global_time = scene_data_block.data.time;
	vertex_shader(vertex,
#ifdef NORMAL_USED
			normal,
#endif
#ifdef TANGENT_USED
			tangent,
			binormal,
#endif
			instance_index, draw_call.multimesh_motion_vectors_current_offset, scene_data_block.data, model_matrix, screen_position);
}

#[fragment]

#version 450

#VERSION_DEFINES

#define SHADER_IS_SRGB false
#define SHADER_SPACE_FAR 0.0

#include "scene_forward_clustered_inc.glsl"

/* Varyings */

layout(location = 0) in vec3 vertex_interp;

#ifdef NORMAL_USED
layout(location = 1) in vec3 normal_interp;
#endif

#if defined(COLOR_USED)
layout(location = 2) in vec4 color_interp;
#endif

#ifdef UV_USED
layout(location = 3) in vec2 uv_interp;
#endif

#if defined(UV2_USED) || defined(USE_LIGHTMAP)
layout(location = 4) in vec2 uv2_interp;
#endif

#ifdef TANGENT_USED
layout(location = 5) in vec3 tangent_interp;
layout(location = 6) in vec3 binormal_interp;
#endif

#ifdef MOTION_VECTORS
layout(location = 7) in vec4 screen_position;
layout(location = 8) in vec4 prev_screen_position;
#endif

#ifdef MODE_DUAL_PARABOLOID

layout(location = 9) in float dp_clip;

#endif

layout(location = 10) in flat uint instance_index_interp;

#ifdef USE_LIGHTMAP
// w0, w1, w2, and w3 are the four cubic B-spline basis functions
float w0(float a) {
	return (1.0 / 6.0) * (a * (a * (-a + 3.0) - 3.0) + 1.0);
}

float w1(float a) {
	return (1.0 / 6.0) * (a * a * (3.0 * a - 6.0) + 4.0);
}

float w2(float a) {
	return (1.0 / 6.0) * (a * (a * (-3.0 * a + 3.0) + 3.0) + 1.0);
}

float w3(float a) {
	return (1.0 / 6.0) * (a * a * a);
}

// g0 and g1 are the two amplitude functions
float g0(float a) {
	return w0(a) + w1(a);
}

float g1(float a) {
	return w2(a) + w3(a);
}

// h0 and h1 are the two offset functions
float h0(float a) {
	return -1.0 + w1(a) / (w0(a) + w1(a));
}

float h1(float a) {
	return 1.0 + w3(a) / (w2(a) + w3(a));
}

vec4 textureArray_bicubic(texture2DArray tex, vec3 uv, vec2 texture_size) {
	vec2 texel_size = vec2(1.0) / texture_size;

	uv.xy = uv.xy * texture_size + vec2(0.5);

	vec2 iuv = floor(uv.xy);
	vec2 fuv = fract(uv.xy);

	float g0x = g0(fuv.x);
	float g1x = g1(fuv.x);
	float h0x = h0(fuv.x);
	float h1x = h1(fuv.x);
	float h0y = h0(fuv.y);
	float h1y = h1(fuv.y);

	vec2 p0 = (vec2(iuv.x + h0x, iuv.y + h0y) - vec2(0.5)) * texel_size;
	vec2 p1 = (vec2(iuv.x + h1x, iuv.y + h0y) - vec2(0.5)) * texel_size;
	vec2 p2 = (vec2(iuv.x + h0x, iuv.y + h1y) - vec2(0.5)) * texel_size;
	vec2 p3 = (vec2(iuv.x + h1x, iuv.y + h1y) - vec2(0.5)) * texel_size;

	return (g0(fuv.y) * (g0x * texture(sampler2DArray(tex, SAMPLER_LINEAR_CLAMP), vec3(p0, uv.z)) + g1x * texture(sampler2DArray(tex, SAMPLER_LINEAR_CLAMP), vec3(p1, uv.z)))) +
			(g1(fuv.y) * (g0x * texture(sampler2DArray(tex, SAMPLER_LINEAR_CLAMP), vec3(p2, uv.z)) + g1x * texture(sampler2DArray(tex, SAMPLER_LINEAR_CLAMP), vec3(p3, uv.z))));
}
#endif //USE_LIGHTMAP

#ifdef USE_MULTIVIEW
#ifdef has_VK_KHR_multiview
#define ViewIndex gl_ViewIndex
#else // has_VK_KHR_multiview
// !BAS! This needs to become an input once we implement our fallback!
#define ViewIndex 0
#endif // has_VK_KHR_multiview
vec3 multiview_uv(vec2 uv) {
	return vec3(uv, ViewIndex);
}
ivec3 multiview_uv(ivec2 uv) {
	return ivec3(uv, int(ViewIndex));
}
layout(location = 11) in vec4 combined_projected;
#else // USE_MULTIVIEW
// Set to zero, not supported in non stereo
#define ViewIndex 0
vec2 multiview_uv(vec2 uv) {
	return uv;
}
ivec2 multiview_uv(ivec2 uv) {
	return uv;
}
#endif //USE_MULTIVIEW
#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED) && defined(USE_VERTEX_LIGHTING)
layout(location = 12) highp in vec4 diffuse_light_interp;
layout(location = 13) highp in vec4 specular_light_interp;
#endif
//defines to keep compatibility with vertex

#ifdef USE_MULTIVIEW
#define projection_matrix scene_data.projection_matrix_view[ViewIndex]
#define inv_projection_matrix scene_data.inv_projection_matrix_view[ViewIndex]
#else
#define projection_matrix scene_data.projection_matrix
#define inv_projection_matrix scene_data.inv_projection_matrix
#endif

#define global_time scene_data_block.data.time

#if defined(ENABLE_SSS) && defined(ENABLE_TRANSMITTANCE)
//both required for transmittance to be enabled
#define LIGHT_TRANSMITTANCE_USED
#endif

#ifdef MATERIAL_UNIFORMS_USED
/* clang-format off */
layout(set = MATERIAL_UNIFORM_SET, binding = 0, std140) uniform MaterialUniforms {
#MATERIAL_UNIFORMS
} material;
/* clang-format on */
#endif

#GLOBALS

#ifdef MODE_RENDER_DEPTH

#ifdef MODE_RENDER_MATERIAL

layout(location = 0) out vec4 albedo_output_buffer;
layout(location = 1) out vec4 normal_output_buffer;
layout(location = 2) out vec4 orm_output_buffer;
layout(location = 3) out vec4 emission_output_buffer;
layout(location = 4) out float depth_output_buffer;

#endif // MODE_RENDER_MATERIAL

#ifdef MODE_RENDER_NORMAL_ROUGHNESS
layout(location = 0) out vec4 normal_roughness_output_buffer;

#ifdef MODE_RENDER_VOXEL_GI
layout(location = 1) out uvec2 voxel_gi_buffer;
#endif

#endif //MODE_RENDER_NORMAL
#else // RENDER DEPTH

#ifdef MODE_SEPARATE_SPECULAR

layout(location = 0) out vec4 diffuse_buffer; //diffuse (rgb) and roughness
layout(location = 1) out vec4 specular_buffer; //specular and SSS (subsurface scatter)
#else

layout(location = 0) out vec4 frag_color;
#endif // MODE_SEPARATE_SPECULAR

#endif // RENDER DEPTH

#ifdef MOTION_VECTORS
layout(location = 2) out vec2 motion_vector;
#endif

#include "../scene_forward_aa_inc.glsl"

#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

// Default to SPECULAR_SCHLICK_GGX.
#if !defined(SPECULAR_DISABLED) && !defined(SPECULAR_SCHLICK_GGX) && !defined(SPECULAR_TOON)
#define SPECULAR_SCHLICK_GGX
#endif

#include "../scene_forward_lights_inc.glsl"

#include "../scene_forward_gi_inc.glsl"

#endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

#ifndef MODE_RENDER_DEPTH

vec4 volumetric_fog_process(vec2 screen_uv, float z) {
	vec3 fog_pos = vec3(screen_uv, z * implementation_data.volumetric_fog_inv_length);
	if (fog_pos.z < 0.0) {
		return vec4(0.0);
	} else if (fog_pos.z < 1.0) {
		fog_pos.z = pow(fog_pos.z, implementation_data.volumetric_fog_detail_spread);
	}

	return texture(sampler3D(volumetric_fog_texture, SAMPLER_LINEAR_CLAMP), fog_pos);
}

vec4 fog_process(vec3 vertex) {
	vec3 fog_color = scene_data_block.data.fog_light_color;

	if (scene_data_block.data.fog_aerial_perspective > 0.0) {
		vec3 sky_fog_color = vec3(0.0);
		vec3 cube_view = scene_data_block.data.radiance_inverse_xform * vertex;
		// mip_level always reads from the second mipmap and higher so the fog is always slightly blurred
		float mip_level = mix(1.0 / MAX_ROUGHNESS_LOD, 1.0, 1.0 - (abs(vertex.z) - scene_data_block.data.z_near) / (scene_data_block.data.z_far - scene_data_block.data.z_near));
#ifdef USE_RADIANCE_CUBEMAP_ARRAY
		float lod, blend;
		blend = modf(mip_level * MAX_ROUGHNESS_LOD, lod);
		sky_fog_color = texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(cube_view, lod)).rgb;
		sky_fog_color = mix(sky_fog_color, texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(cube_view, lod + 1)).rgb, blend);
#else
		sky_fog_color = textureLod(samplerCube(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), cube_view, mip_level * MAX_ROUGHNESS_LOD).rgb;
#endif //USE_RADIANCE_CUBEMAP_ARRAY
		fog_color = mix(fog_color, sky_fog_color, scene_data_block.data.fog_aerial_perspective);
	}

	if (scene_data_block.data.fog_sun_scatter > 0.001) {
		vec4 sun_scatter = vec4(0.0);
		float sun_total = 0.0;
		vec3 view = normalize(vertex);

		for (uint i = 0; i < scene_data_block.data.directional_light_count; i++) {
			vec3 light_color = directional_lights.data[i].color * directional_lights.data[i].energy;
			float light_amount = pow(max(dot(view, directional_lights.data[i].direction), 0.0), 8.0);
			fog_color += light_color * light_amount * scene_data_block.data.fog_sun_scatter;
		}
	}

	float fog_amount = 0.0;

	if (sc_use_depth_fog()) {
		float fog_z = smoothstep(scene_data_block.data.fog_depth_begin, scene_data_block.data.fog_depth_end, length(vertex));
		float fog_quad_amount = pow(fog_z, scene_data_block.data.fog_depth_curve) * scene_data_block.data.fog_density;
		fog_amount = fog_quad_amount;
	} else {
		fog_amount = 1 - exp(min(0.0, -length(vertex) * scene_data_block.data.fog_density));
	}

	if (abs(scene_data_block.data.fog_height_density) >= 0.0001) {
		float y = (scene_data_block.data.inv_view_matrix * vec4(vertex, 1.0)).y;

		float y_dist = y - scene_data_block.data.fog_height;

		float vfog_amount = 1.0 - exp(min(0.0, y_dist * scene_data_block.data.fog_height_density));

		fog_amount = max(vfog_amount, fog_amount);
	}

	return vec4(fog_color, fog_amount);
}

void cluster_get_item_range(uint p_offset, out uint item_min, out uint item_max, out uint item_from, out uint item_to) {
	uint item_min_max = cluster_buffer.data[p_offset];
	item_min = item_min_max & 0xFFFFu;
	item_max = item_min_max >> 16;

	item_from = item_min >> 5;
	item_to = (item_max == 0) ? 0 : ((item_max - 1) >> 5) + 1; //side effect of how it is stored, as item_max 0 means no elements
}

uint cluster_get_range_clip_mask(uint i, uint z_min, uint z_max) {
	int local_min = clamp(int(z_min) - int(i) * 32, 0, 31);
	int mask_width = min(int(z_max) - int(z_min), 32 - local_min);
	return bitfieldInsert(uint(0), uint(0xFFFFFFFF), local_min, mask_width);
}

#endif //!MODE_RENDER DEPTH

#if defined(MODE_RENDER_NORMAL_ROUGHNESS) || defined(MODE_RENDER_MATERIAL)
// https://advances.realtimerendering.com/s2010/Kaplanyan-CryEngine3(SIGGRAPH%202010%20Advanced%20RealTime%20Rendering%20Course).pdf
vec3 encode24(vec3 v) {
	// Unsigned normal (handles most symmetry)
	vec3 vNormalUns = abs(v);
	// Get the major axis for our collapsed cubemap lookup
	float maxNAbs = max(vNormalUns.z, max(vNormalUns.x, vNormalUns.y));
	// Get the collapsed cubemap texture coordinates
	vec2 vTexCoord = vNormalUns.z < maxNAbs ? (vNormalUns.y < maxNAbs ? vNormalUns.yz : vNormalUns.xz) : vNormalUns.xy;
	vTexCoord /= maxNAbs;
	vTexCoord = vTexCoord.x < vTexCoord.y ? vTexCoord.yx : vTexCoord.xy;
	// Stretch:
	vTexCoord.y /= vTexCoord.x;
	float fFittingScale = texture(sampler2D(best_fit_normal_texture, SAMPLER_NEAREST_CLAMP), vTexCoord).r;
	// Make vector touch unit cube
	vec3 result = v / maxNAbs;
	// scale the normal to get the best fit
	result *= fFittingScale;
	return result;
}
#endif // MODE_RENDER_NORMAL_ROUGHNESS

void fragment_shader(in SceneData scene_data) {
	uint instance_index = instance_index_interp;

#ifdef PREMUL_ALPHA_USED
	float premul_alpha = 1.0;
#endif // PREMUL_ALPHA_USED
	//lay out everything, whatever is unused is optimized away anyway
	vec3 vertex = vertex_interp;
#ifdef USE_MULTIVIEW
	vec3 eye_offset = scene_data.eye_offset[ViewIndex].xyz;
	vec3 view = -normalize(vertex_interp - eye_offset);

	// UV in our combined frustum space is used for certain screen uv processes where it's
	// overkill to render separate left and right eye views
	vec2 combined_uv = (combined_projected.xy / combined_projected.w) * 0.5 + 0.5;
#else
	vec3 eye_offset = vec3(0.0, 0.0, 0.0);
	vec3 view = -normalize(vertex_interp);
#endif
	vec3 albedo = vec3(1.0);
	vec3 backlight = vec3(0.0);
	vec4 transmittance_color = vec4(0.0, 0.0, 0.0, 1.0);
	float transmittance_depth = 0.0;
	float transmittance_boost = 0.0;
	float metallic = 0.0;
	float specular = 0.5;
	vec3 emission = vec3(0.0);
	float roughness = 1.0;
	float rim = 0.0;
	float rim_tint = 0.0;
	float clearcoat = 0.0;
	float clearcoat_roughness = 0.0;
	float anisotropy = 0.0;
	vec2 anisotropy_flow = vec2(1.0, 0.0);
#ifndef FOG_DISABLED
	vec4 fog = vec4(0.0);
#endif // !FOG_DISABLED
#if defined(CUSTOM_RADIANCE_USED)
	vec4 custom_radiance = vec4(0.0);
#endif
#if defined(CUSTOM_IRRADIANCE_USED)
	vec4 custom_irradiance = vec4(0.0);
#endif

	float ao = 1.0;
	float ao_light_affect = 0.0;

	float alpha = float(instances.data[instance_index].flags >> INSTANCE_FLAGS_FADE_SHIFT) / float(255.0);

#ifdef TANGENT_USED
	vec3 binormal = binormal_interp;
	vec3 tangent = tangent_interp;
#else
	vec3 binormal = vec3(0.0);
	vec3 tangent = vec3(0.0);
#endif

#ifdef NORMAL_USED
	vec3 normal = normal_interp;
#if defined(DO_SIDE_CHECK)
	if (!gl_FrontFacing) {
		normal = -normal;
	}
#endif // DO_SIDE_CHECK
#endif // NORMAL_USED

#ifdef UV_USED
	vec2 uv = uv_interp;
#endif

#if defined(UV2_USED) || defined(USE_LIGHTMAP)
	vec2 uv2 = uv2_interp;
#endif

#if defined(COLOR_USED)
	vec4 color = color_interp;
#endif

#if defined(NORMAL_MAP_USED)

	vec3 normal_map = vec3(0.5);
#endif

	float normal_map_depth = 1.0;

	vec2 screen_uv = gl_FragCoord.xy * scene_data.screen_pixel_size;

	float sss_strength = 0.0;

#ifdef ALPHA_SCISSOR_USED
	float alpha_scissor_threshold = 1.0;
#endif // ALPHA_SCISSOR_USED

#ifdef ALPHA_HASH_USED
	float alpha_hash_scale = 1.0;
#endif // ALPHA_HASH_USED

#ifdef ALPHA_ANTIALIASING_EDGE_USED
	float alpha_antialiasing_edge = 0.0;
	vec2 alpha_texture_coordinate = vec2(0.0, 0.0);
#endif // ALPHA_ANTIALIASING_EDGE_USED

	mat4 inv_view_matrix = scene_data.inv_view_matrix;
	mat4 read_model_matrix = instances.data[instance_index].transform;
#ifdef USE_DOUBLE_PRECISION
	read_model_matrix[0][3] = 0.0;
	read_model_matrix[1][3] = 0.0;
	read_model_matrix[2][3] = 0.0;
	inv_view_matrix[0][3] = 0.0;
	inv_view_matrix[1][3] = 0.0;
	inv_view_matrix[2][3] = 0.0;
#endif

#ifdef LIGHT_VERTEX_USED
	vec3 light_vertex = vertex;
#endif //LIGHT_VERTEX_USED

	mat3 model_normal_matrix;
	if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_NON_UNIFORM_SCALE)) {
		model_normal_matrix = transpose(inverse(mat3(read_model_matrix)));
	} else {
		model_normal_matrix = mat3(read_model_matrix);
	}

	mat4 read_view_matrix = scene_data.view_matrix;
	vec2 read_viewport_size = scene_data.viewport_size;
	{
#CODE : FRAGMENT
	}

#ifdef LIGHT_TRANSMITTANCE_USED
	transmittance_color.a *= sss_strength;
#endif

#ifdef LIGHT_VERTEX_USED
	vertex = light_vertex;
#ifdef USE_MULTIVIEW
	view = -normalize(vertex - eye_offset);
#else
	view = -normalize(vertex);
#endif //USE_MULTIVIEW
#endif //LIGHT_VERTEX_USED

#ifdef NORMAL_USED
	vec3 geo_normal = normalize(normal);
#endif // NORMAL_USED

#ifndef USE_SHADOW_TO_OPACITY

#ifdef ALPHA_SCISSOR_USED
#ifdef MODE_RENDER_MATERIAL
	if (alpha < alpha_scissor_threshold) {
		alpha = 0.0;
	} else {
		alpha = 1.0;
	}
#else
	if (alpha < alpha_scissor_threshold) {
		discard;
	}
#endif // MODE_RENDER_MATERIAL
#endif // ALPHA_SCISSOR_USED

// alpha hash can be used in unison with alpha antialiasing
#ifdef ALPHA_HASH_USED
	vec3 object_pos = (inverse(read_model_matrix) * inv_view_matrix * vec4(vertex, 1.0)).xyz;
#ifdef MODE_RENDER_MATERIAL
	if (alpha < compute_alpha_hash_threshold(object_pos, alpha_hash_scale)) {
		alpha = 0.0;
	} else {
		alpha = 1.0;
	}
#else
	if (alpha < compute_alpha_hash_threshold(object_pos, alpha_hash_scale)) {
		discard;
	}
#endif // MODE_RENDER_MATERIAL
#endif // ALPHA_HASH_USED

// If we are not edge antialiasing, we need to remove the output alpha channel from scissor and hash
#if (defined(ALPHA_SCISSOR_USED) || defined(ALPHA_HASH_USED)) && !defined(ALPHA_ANTIALIASING_EDGE_USED) && !defined(MODE_RENDER_MATERIAL)
	alpha = 1.0;
#endif

#ifdef ALPHA_ANTIALIASING_EDGE_USED
// If alpha scissor is used, we must further the edge threshold, otherwise we won't get any edge feather
#ifdef ALPHA_SCISSOR_USED
	alpha_antialiasing_edge = clamp(alpha_scissor_threshold + alpha_antialiasing_edge, 0.0, 1.0);
#endif
	alpha = compute_alpha_antialiasing_edge(alpha, alpha_texture_coordinate, alpha_antialiasing_edge);
#endif // ALPHA_ANTIALIASING_EDGE_USED

#ifdef MODE_RENDER_DEPTH
#if defined(USE_OPAQUE_PREPASS) || defined(ALPHA_ANTIALIASING_EDGE_USED)
	if (alpha < scene_data.opaque_prepass_threshold) {
		discard;
	}
#endif // USE_OPAQUE_PREPASS || ALPHA_ANTIALIASING_EDGE_USED
#endif // MODE_RENDER_DEPTH

#endif // !USE_SHADOW_TO_OPACITY

#if defined(NORMAL_MAP_USED)
	normal_map.xy = normal_map.xy * 2.0 - 1.0;
	normal_map.z = sqrt(max(0.0, 1.0 - dot(normal_map.xy, normal_map.xy))); //always ignore Z, as it can be RG packed, Z may be pos/neg, etc.

	// Tangent-space transformation is performed using unnormalized TBN vectors, per MikkTSpace.
	// See: http://www.mikktspace.com/
	normal = normalize(mix(normal, tangent * normal_map.x + binormal * normal_map.y + normal * normal_map.z, normal_map_depth));
#elif defined(NORMAL_USED)
	normal = geo_normal;
#endif // NORMAL_MAP_USED

#ifdef LIGHT_ANISOTROPY_USED

	if (anisotropy > 0.01) {
		mat3 rot = mat3(normalize(tangent), normalize(binormal), normal);
		// Make local to space.
		tangent = normalize(rot * vec3(anisotropy_flow.x, anisotropy_flow.y, 0.0));
		binormal = normalize(rot * vec3(-anisotropy_flow.y, anisotropy_flow.x, 0.0));
	}

#endif

#ifdef ENABLE_CLIP_ALPHA
#ifdef MODE_RENDER_MATERIAL
	if (albedo.a < 0.99) {
		// Used for doublepass and shadowmapping.
		albedo.a = 0.0;
		alpha = 0.0;
	} else {
		albedo.a = 1.0;
		alpha = 1.0;
	}
#else
	if (albedo.a < 0.99) {
		//used for doublepass and shadowmapping
		discard;
	}
#endif // MODE_RENDER_MATERIAL
#endif

	/////////////////////// FOG //////////////////////
#ifndef MODE_RENDER_DEPTH

#ifndef FOG_DISABLED
#ifndef CUSTOM_FOG_USED
	// fog must be processed as early as possible and then packed.
	// to maximize VGPR usage
	// Draw "fixed" fog before volumetric fog to ensure volumetric fog can appear in front of the sky.

	if (scene_data.fog_enabled) {
		fog = fog_process(vertex);
	}

	if (implementation_data.volumetric_fog_enabled) {
#ifdef USE_MULTIVIEW
		vec4 volumetric_fog = volumetric_fog_process(combined_uv, -vertex.z);
#else
		vec4 volumetric_fog = volumetric_fog_process(screen_uv, -vertex.z);
#endif
		if (scene_data.fog_enabled) {
			//must use the full blending equation here to blend fogs
			vec4 res;
			float sa = 1.0 - volumetric_fog.a;
			res.a = fog.a * sa + volumetric_fog.a;
			if (res.a == 0.0) {
				res.rgb = vec3(0.0);
			} else {
				res.rgb = (fog.rgb * fog.a * sa + volumetric_fog.rgb * volumetric_fog.a) / res.a;
			}
			fog = res;
		} else {
			fog = volumetric_fog;
		}
	}
#endif //!CUSTOM_FOG_USED

	uint fog_rg = packHalf2x16(fog.rg);
	uint fog_ba = packHalf2x16(fog.ba);

#endif //!FOG_DISABLED
#endif //!MODE_RENDER_DEPTH

	/////////////////////// DECALS ////////////////////////////////

#ifndef MODE_RENDER_DEPTH

#ifdef USE_MULTIVIEW
	uvec2 cluster_pos = uvec2(combined_uv.xy / scene_data.screen_pixel_size) >> implementation_data.cluster_shift;
#else
	uvec2 cluster_pos = uvec2(gl_FragCoord.xy) >> implementation_data.cluster_shift;
#endif
	uint cluster_offset = (implementation_data.cluster_width * cluster_pos.y + cluster_pos.x) * (implementation_data.max_cluster_element_count_div_32 + 32);

	uint cluster_z = uint(clamp((-vertex.z / scene_data.z_far) * 32.0, 0.0, 31.0));

	//used for interpolating anything cluster related
	vec3 vertex_ddx = dFdx(vertex);
	vec3 vertex_ddy = dFdy(vertex);

	{ // process decals

		uint cluster_decal_offset = cluster_offset + implementation_data.cluster_type_size * 2;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_decal_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

#ifdef USE_SUBGROUPS
		item_from = subgroupBroadcastFirst(subgroupMin(item_from));
		item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_decal_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
			uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
			uint merged_mask = mask;
#endif

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);
#ifdef USE_SUBGROUPS
				if (((1u << bit) & mask) == 0) { //do not process if not originally here
					continue;
				}
#endif
				uint decal_index = 32 * i + bit;

				if (!bool(decals.data[decal_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				vec3 uv_local = (decals.data[decal_index].xform * vec4(vertex, 1.0)).xyz;
				if (any(lessThan(uv_local, vec3(0.0, -1.0, 0.0))) || any(greaterThan(uv_local, vec3(1.0)))) {
					continue; //out of decal
				}

				float fade = pow(1.0 - (uv_local.y > 0.0 ? uv_local.y : -uv_local.y), uv_local.y > 0.0 ? decals.data[decal_index].upper_fade : decals.data[decal_index].lower_fade);

				if (decals.data[decal_index].normal_fade > 0.0) {
					fade *= smoothstep(decals.data[decal_index].normal_fade, 1.0, dot(geo_normal, decals.data[decal_index].normal) * 0.5 + 0.5);
				}

				//we need ddx/ddy for mipmaps, so simulate them
				vec2 ddx = (decals.data[decal_index].xform * vec4(vertex_ddx, 0.0)).xz;
				vec2 ddy = (decals.data[decal_index].xform * vec4(vertex_ddy, 0.0)).xz;

				if (decals.data[decal_index].albedo_rect != vec4(0.0)) {
					//has albedo
					vec4 decal_albedo;
					if (sc_decal_use_mipmaps()) {
						decal_albedo = textureGrad(sampler2D(decal_atlas_srgb, decal_sampler), uv_local.xz * decals.data[decal_index].albedo_rect.zw + decals.data[decal_index].albedo_rect.xy, ddx * decals.data[decal_index].albedo_rect.zw, ddy * decals.data[decal_index].albedo_rect.zw);
					} else {
						decal_albedo = textureLod(sampler2D(decal_atlas_srgb, decal_sampler), uv_local.xz * decals.data[decal_index].albedo_rect.zw + decals.data[decal_index].albedo_rect.xy, 0.0);
					}
					decal_albedo *= decals.data[decal_index].modulate;
					decal_albedo.a *= fade;
					albedo = mix(albedo, decal_albedo.rgb, decal_albedo.a * decals.data[decal_index].albedo_mix);

					if (decals.data[decal_index].normal_rect != vec4(0.0)) {
						vec3 decal_normal;
						if (sc_decal_use_mipmaps()) {
							decal_normal = textureGrad(sampler2D(decal_atlas, decal_sampler), uv_local.xz * decals.data[decal_index].normal_rect.zw + decals.data[decal_index].normal_rect.xy, ddx * decals.data[decal_index].normal_rect.zw, ddy * decals.data[decal_index].normal_rect.zw).xyz;
						} else {
							decal_normal = textureLod(sampler2D(decal_atlas, decal_sampler), uv_local.xz * decals.data[decal_index].normal_rect.zw + decals.data[decal_index].normal_rect.xy, 0.0).xyz;
						}
						decal_normal.xy = decal_normal.xy * vec2(2.0, -2.0) - vec2(1.0, -1.0); //users prefer flipped y normal maps in most authoring software
						decal_normal.z = sqrt(max(0.0, 1.0 - dot(decal_normal.xy, decal_normal.xy)));
						//convert to view space, use xzy because y is up
						decal_normal = (decals.data[decal_index].normal_xform * decal_normal.xzy).xyz;

						normal = normalize(mix(normal, decal_normal, decal_albedo.a));
					}

					if (decals.data[decal_index].orm_rect != vec4(0.0)) {
						vec3 decal_orm;
						if (sc_decal_use_mipmaps()) {
							decal_orm = textureGrad(sampler2D(decal_atlas, decal_sampler), uv_local.xz * decals.data[decal_index].orm_rect.zw + decals.data[decal_index].orm_rect.xy, ddx * decals.data[decal_index].orm_rect.zw, ddy * decals.data[decal_index].orm_rect.zw).xyz;
						} else {
							decal_orm = textureLod(sampler2D(decal_atlas, decal_sampler), uv_local.xz * decals.data[decal_index].orm_rect.zw + decals.data[decal_index].orm_rect.xy, 0.0).xyz;
						}
						ao = mix(ao, decal_orm.r, decal_albedo.a);
						roughness = mix(roughness, decal_orm.g, decal_albedo.a);
						metallic = mix(metallic, decal_orm.b, decal_albedo.a);
					}
				}

				if (decals.data[decal_index].emission_rect != vec4(0.0)) {
					//emission is additive, so its independent from albedo
					if (sc_decal_use_mipmaps()) {
						emission += textureGrad(sampler2D(decal_atlas_srgb, decal_sampler), uv_local.xz * decals.data[decal_index].emission_rect.zw + decals.data[decal_index].emission_rect.xy, ddx * decals.data[decal_index].emission_rect.zw, ddy * decals.data[decal_index].emission_rect.zw).xyz * decals.data[decal_index].modulate.rgb * decals.data[decal_index].emission_energy * fade;
					} else {
						emission += textureLod(sampler2D(decal_atlas_srgb, decal_sampler), uv_local.xz * decals.data[decal_index].emission_rect.zw + decals.data[decal_index].emission_rect.xy, 0.0).xyz * decals.data[decal_index].modulate.rgb * decals.data[decal_index].emission_energy * fade;
					}
				}
			}
		}
	}

	//pack albedo until needed again, saves 2 VGPRs in the meantime

#endif //not render depth
	/////////////////////// LIGHTING //////////////////////////////

#ifdef NORMAL_USED
	if (scene_data.roughness_limiter_enabled) {
		//https://www.jp.square-enix.com/tech/library/pdf/ImprovedGeometricSpecularAA.pdf
		float roughness2 = roughness * roughness;
		vec3 dndu = dFdx(normal), dndv = dFdy(normal);
		float variance = scene_data.roughness_limiter_amount * (dot(dndu, dndu) + dot(dndv, dndv));
		float kernelRoughness2 = min(2.0 * variance, scene_data.roughness_limiter_limit); //limit effect
		float filteredRoughness2 = min(1.0, roughness2 + kernelRoughness2);
		roughness = sqrt(filteredRoughness2);
	}
#endif
	//apply energy conservation

	vec3 specular_light = vec3(0.0, 0.0, 0.0);
	vec3 diffuse_light = vec3(0.0, 0.0, 0.0);
	vec3 ambient_light = vec3(0.0, 0.0, 0.0);
#ifndef MODE_UNSHADED
	// Used in regular draw pass and when drawing SDFs for SDFGI and materials for VoxelGI.
	emission *= scene_data.emissive_exposure_normalization;
#endif

#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

#ifndef AMBIENT_LIGHT_DISABLED

	if (scene_data.use_reflection_cubemap) {
#ifdef LIGHT_ANISOTROPY_USED
		// https://google.github.io/filament/Filament.html#lighting/imagebasedlights/anisotropy
		vec3 anisotropic_direction = anisotropy >= 0.0 ? binormal : tangent;
		vec3 anisotropic_tangent = cross(anisotropic_direction, view);
		vec3 anisotropic_normal = cross(anisotropic_tangent, anisotropic_direction);
		vec3 bent_normal = normalize(mix(normal, anisotropic_normal, abs(anisotropy) * clamp(5.0 * roughness, 0.0, 1.0)));
		vec3 ref_vec = reflect(-view, bent_normal);
		ref_vec = mix(ref_vec, bent_normal, roughness * roughness);
#else
		vec3 ref_vec = reflect(-view, normal);
		ref_vec = mix(ref_vec, normal, roughness * roughness);
#endif

		float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
		ref_vec = scene_data.radiance_inverse_xform * ref_vec;
#ifdef USE_RADIANCE_CUBEMAP_ARRAY

		float lod, blend;

		blend = modf(sqrt(roughness) * MAX_ROUGHNESS_LOD, lod);
		specular_light = texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(ref_vec, lod)).rgb;
		specular_light = mix(specular_light, texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(ref_vec, lod + 1)).rgb, blend);

#else
		specular_light = textureLod(samplerCube(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), ref_vec, sqrt(roughness) * MAX_ROUGHNESS_LOD).rgb;

#endif //USE_RADIANCE_CUBEMAP_ARRAY
		specular_light *= scene_data.IBL_exposure_normalization;
		specular_light *= horizon * horizon;
		specular_light *= scene_data.ambient_light_color_energy.a;
	}

#if defined(CUSTOM_RADIANCE_USED)
	specular_light = mix(specular_light, custom_radiance.rgb, custom_radiance.a);
#endif

#ifndef USE_LIGHTMAP
	//lightmap overrides everything
	if (scene_data.use_ambient_light) {
		ambient_light = scene_data.ambient_light_color_energy.rgb;

		if (scene_data.use_ambient_cubemap) {
			vec3 ambient_dir = scene_data.radiance_inverse_xform * normal;
#ifdef USE_RADIANCE_CUBEMAP_ARRAY
			vec3 cubemap_ambient = texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(ambient_dir, MAX_ROUGHNESS_LOD)).rgb;
#else
			vec3 cubemap_ambient = textureLod(samplerCube(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), ambient_dir, MAX_ROUGHNESS_LOD).rgb;
#endif //USE_RADIANCE_CUBEMAP_ARRAY
			cubemap_ambient *= scene_data.IBL_exposure_normalization;
			ambient_light = mix(ambient_light, cubemap_ambient * scene_data.ambient_light_color_energy.a, scene_data.ambient_color_sky_mix);
		}
	}
#endif // USE_LIGHTMAP
#if defined(CUSTOM_IRRADIANCE_USED)
	ambient_light = mix(ambient_light, custom_irradiance.rgb, custom_irradiance.a);
#endif

#ifdef LIGHT_CLEARCOAT_USED

	if (scene_data.use_reflection_cubemap) {
		float NoV = max(dot(geo_normal, view), 0.0001); // We want to use geometric normal, not normal_map
		vec3 ref_vec = reflect(-view, geo_normal);
		ref_vec = mix(ref_vec, geo_normal, clearcoat_roughness * clearcoat_roughness);
		// The clear coat layer assumes an IOR of 1.5 (4% reflectance)
		float Fc = clearcoat * (0.04 + 0.96 * SchlickFresnel(NoV));
		float attenuation = 1.0 - Fc;
		ambient_light *= attenuation;
		specular_light *= attenuation;

		float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
		ref_vec = scene_data.radiance_inverse_xform * ref_vec;
		float roughness_lod = mix(0.001, 0.1, sqrt(clearcoat_roughness)) * MAX_ROUGHNESS_LOD;
#ifdef USE_RADIANCE_CUBEMAP_ARRAY

		float lod, blend;
		blend = modf(roughness_lod, lod);
		vec3 clearcoat_light = texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(ref_vec, lod)).rgb;
		clearcoat_light = mix(clearcoat_light, texture(samplerCubeArray(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), vec4(ref_vec, lod + 1)).rgb, blend);

#else
		vec3 clearcoat_light = textureLod(samplerCube(radiance_cubemap, DEFAULT_SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP), ref_vec, roughness_lod).rgb;

#endif //USE_RADIANCE_CUBEMAP_ARRAY
		specular_light += clearcoat_light * horizon * horizon * Fc * scene_data.ambient_light_color_energy.a;
	}
#endif // LIGHT_CLEARCOAT_USED
#endif // !AMBIENT_LIGHT_DISABLED
#endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

	//radiance

/// GI ///
#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)
#ifndef AMBIENT_LIGHT_DISABLED
#ifdef USE_LIGHTMAP

	//lightmap
	if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP_CAPTURE)) { //has lightmap capture
		uint index = instances.data[instance_index].gi_offset;

		vec3 wnormal = mat3(scene_data.inv_view_matrix) * normal;
		const float c1 = 0.429043;
		const float c2 = 0.511664;
		const float c3 = 0.743125;
		const float c4 = 0.886227;
		const float c5 = 0.247708;
		ambient_light += (c1 * lightmap_captures.data[index].sh[8].rgb * (wnormal.x * wnormal.x - wnormal.y * wnormal.y) +
								 c3 * lightmap_captures.data[index].sh[6].rgb * wnormal.z * wnormal.z +
								 c4 * lightmap_captures.data[index].sh[0].rgb -
								 c5 * lightmap_captures.data[index].sh[6].rgb +
								 2.0 * c1 * lightmap_captures.data[index].sh[4].rgb * wnormal.x * wnormal.y +
								 2.0 * c1 * lightmap_captures.data[index].sh[7].rgb * wnormal.x * wnormal.z +
								 2.0 * c1 * lightmap_captures.data[index].sh[5].rgb * wnormal.y * wnormal.z +
								 2.0 * c2 * lightmap_captures.data[index].sh[3].rgb * wnormal.x +
								 2.0 * c2 * lightmap_captures.data[index].sh[1].rgb * wnormal.y +
								 2.0 * c2 * lightmap_captures.data[index].sh[2].rgb * wnormal.z) *
				scene_data.emissive_exposure_normalization;

	} else if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) { // has actual lightmap
		bool uses_sh = bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_SH_LIGHTMAP);
		uint ofs = instances.data[instance_index].gi_offset & 0xFFFF;
		uint slice = instances.data[instance_index].gi_offset >> 16;
		vec3 uvw;
		uvw.xy = uv2 * instances.data[instance_index].lightmap_uv_scale.zw + instances.data[instance_index].lightmap_uv_scale.xy;
		uvw.z = float(slice);

		if (uses_sh) {
			uvw.z *= 4.0; //SH textures use 4 times more data
			vec3 lm_light_l0;
			vec3 lm_light_l1n1;
			vec3 lm_light_l1_0;
			vec3 lm_light_l1p1;

			if (sc_use_lightmap_bicubic_filter()) {
				lm_light_l0 = textureArray_bicubic(lightmap_textures[ofs], uvw + vec3(0.0, 0.0, 0.0), lightmaps.data[ofs].light_texture_size).rgb;
				lm_light_l1n1 = (textureArray_bicubic(lightmap_textures[ofs], uvw + vec3(0.0, 0.0, 1.0), lightmaps.data[ofs].light_texture_size).rgb - vec3(0.5)) * 2.0;
				lm_light_l1_0 = (textureArray_bicubic(lightmap_textures[ofs], uvw + vec3(0.0, 0.0, 2.0), lightmaps.data[ofs].light_texture_size).rgb - vec3(0.5)) * 2.0;
				lm_light_l1p1 = (textureArray_bicubic(lightmap_textures[ofs], uvw + vec3(0.0, 0.0, 3.0), lightmaps.data[ofs].light_texture_size).rgb - vec3(0.5)) * 2.0;
			} else {
				lm_light_l0 = textureLod(sampler2DArray(lightmap_textures[ofs], SAMPLER_LINEAR_CLAMP), uvw + vec3(0.0, 0.0, 0.0), 0.0).rgb;
				lm_light_l1n1 = (textureLod(sampler2DArray(lightmap_textures[ofs], SAMPLER_LINEAR_CLAMP), uvw + vec3(0.0, 0.0, 1.0), 0.0).rgb - vec3(0.5)) * 2.0;
				lm_light_l1_0 = (textureLod(sampler2DArray(lightmap_textures[ofs], SAMPLER_LINEAR_CLAMP), uvw + vec3(0.0, 0.0, 2.0), 0.0).rgb - vec3(0.5)) * 2.0;
				lm_light_l1p1 = (textureLod(sampler2DArray(lightmap_textures[ofs], SAMPLER_LINEAR_CLAMP), uvw + vec3(0.0, 0.0, 3.0), 0.0).rgb - vec3(0.5)) * 2.0;
			}

			vec3 n = normalize(lightmaps.data[ofs].normal_xform * normal);
			float en = lightmaps.data[ofs].exposure_normalization;

			ambient_light += lm_light_l0 * en;
			ambient_light += lm_light_l1n1 * n.y * (lm_light_l0 * en * 4.0);
			ambient_light += lm_light_l1_0 * n.z * (lm_light_l0 * en * 4.0);
			ambient_light += lm_light_l1p1 * n.x * (lm_light_l0 * en * 4.0);

		} else {
			if (sc_use_lightmap_bicubic_filter()) {
				ambient_light += textureArray_bicubic(lightmap_textures[ofs], uvw, lightmaps.data[ofs].light_texture_size).rgb * lightmaps.data[ofs].exposure_normalization;
			} else {
				ambient_light += textureLod(sampler2DArray(lightmap_textures[ofs], SAMPLER_LINEAR_CLAMP), uvw, 0.0).rgb * lightmaps.data[ofs].exposure_normalization;
			}
		}
	}
#else

	if (sc_use_forward_gi() && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_SDFGI)) { //has lightmap capture

		//make vertex orientation the world one, but still align to camera
		vec3 cam_pos = mat3(scene_data.inv_view_matrix) * vertex;
		vec3 cam_normal = mat3(scene_data.inv_view_matrix) * normal;
		vec3 cam_reflection = mat3(scene_data.inv_view_matrix) * reflect(-view, normal);

		//apply y-mult
		cam_pos.y *= sdfgi.y_mult;
		cam_normal.y *= sdfgi.y_mult;
		cam_normal = normalize(cam_normal);
		cam_reflection.y *= sdfgi.y_mult;
		cam_normal = normalize(cam_normal);
		cam_reflection = normalize(cam_reflection);

		vec4 light_accum = vec4(0.0);
		float weight_accum = 0.0;

		vec4 light_blend_accum = vec4(0.0);
		float weight_blend_accum = 0.0;

		float blend = -1.0;

		// helper constants, compute once

		uint cascade = 0xFFFFFFFF;
		vec3 cascade_pos;
		vec3 cascade_normal;

		for (uint i = 0; i < sdfgi.max_cascades; i++) {
			cascade_pos = (cam_pos - sdfgi.cascades[i].position) * sdfgi.cascades[i].to_probe;

			if (any(lessThan(cascade_pos, vec3(0.0))) || any(greaterThanEqual(cascade_pos, sdfgi.cascade_probe_size))) {
				continue; //skip cascade
			}

			cascade = i;
			break;
		}

		if (cascade < SDFGI_MAX_CASCADES) {
			bool use_specular = true;
			float blend;
			vec3 diffuse, specular;
			sdfgi_process(cascade, cascade_pos, cam_pos, cam_normal, cam_reflection, use_specular, roughness, diffuse, specular, blend);

			if (blend > 0.0) {
				//blend
				if (cascade == sdfgi.max_cascades - 1) {
					diffuse = mix(diffuse, ambient_light, blend);
					if (use_specular) {
						specular = mix(specular, specular_light, blend);
					}
				} else {
					vec3 diffuse2, specular2;
					float blend2;
					cascade_pos = (cam_pos - sdfgi.cascades[cascade + 1].position) * sdfgi.cascades[cascade + 1].to_probe;
					sdfgi_process(cascade + 1, cascade_pos, cam_pos, cam_normal, cam_reflection, use_specular, roughness, diffuse2, specular2, blend2);
					diffuse = mix(diffuse, diffuse2, blend);
					if (use_specular) {
						specular = mix(specular, specular2, blend);
					}
				}
			}

			ambient_light = diffuse;
			if (use_specular) {
				specular_light = specular;
			}
		}
	}

	if (sc_use_forward_gi() && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_VOXEL_GI)) { // process voxel_gi_instances
		uint index1 = instances.data[instance_index].gi_offset & 0xFFFF;
		// Make vertex orientation the world one, but still align to camera.
		vec3 cam_pos = mat3(scene_data.inv_view_matrix) * vertex;
		vec3 cam_normal = mat3(scene_data.inv_view_matrix) * normal;
		vec3 ref_vec = mat3(scene_data.inv_view_matrix) * normalize(reflect(-view, normal));

		//find arbitrary tangent and bitangent, then build a matrix
		vec3 v0 = abs(cam_normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);
		vec3 tangent = normalize(cross(v0, cam_normal));
		vec3 bitangent = normalize(cross(tangent, cam_normal));
		mat3 normal_mat = mat3(tangent, bitangent, cam_normal);

		vec4 amb_accum = vec4(0.0);
		vec4 spec_accum = vec4(0.0);
		voxel_gi_compute(index1, cam_pos, cam_normal, ref_vec, normal_mat, roughness * roughness, ambient_light, specular_light, spec_accum, amb_accum);

		uint index2 = instances.data[instance_index].gi_offset >> 16;

		if (index2 != 0xFFFF) {
			voxel_gi_compute(index2, cam_pos, cam_normal, ref_vec, normal_mat, roughness * roughness, ambient_light, specular_light, spec_accum, amb_accum);
		}

		if (amb_accum.a > 0.0) {
			amb_accum.rgb /= amb_accum.a;
		}

		if (spec_accum.a > 0.0) {
			spec_accum.rgb /= spec_accum.a;
		}

		specular_light = spec_accum.rgb;
		ambient_light = amb_accum.rgb;
	}

	if (!sc_use_forward_gi() && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_GI_BUFFERS)) { //use GI buffers

		vec2 coord;

		if (implementation_data.gi_upscale_for_msaa) {
			vec2 base_coord = screen_uv;
			vec2 closest_coord = base_coord;
#ifdef USE_MULTIVIEW
			float closest_ang = dot(normal, normalize(textureLod(sampler2DArray(normal_roughness_buffer, SAMPLER_LINEAR_CLAMP), vec3(base_coord, ViewIndex), 0.0).xyz * 2.0 - 1.0));
#else // USE_MULTIVIEW
			float closest_ang = dot(normal, normalize(textureLod(sampler2D(normal_roughness_buffer, SAMPLER_LINEAR_CLAMP), base_coord, 0.0).xyz * 2.0 - 1.0));
#endif // USE_MULTIVIEW

			for (int i = 0; i < 4; i++) {
				const vec2 neighbors[4] = vec2[](vec2(-1, 0), vec2(1, 0), vec2(0, -1), vec2(0, 1));
				vec2 neighbour_coord = base_coord + neighbors[i] * scene_data.screen_pixel_size;
#ifdef USE_MULTIVIEW
				float neighbour_ang = dot(normal, normalize(textureLod(sampler2DArray(normal_roughness_buffer, SAMPLER_LINEAR_CLAMP), vec3(neighbour_coord, ViewIndex), 0.0).xyz * 2.0 - 1.0));
#else // USE_MULTIVIEW
				float neighbour_ang = dot(normal, normalize(textureLod(sampler2D(normal_roughness_buffer, SAMPLER_LINEAR_CLAMP), neighbour_coord, 0.0).xyz * 2.0 - 1.0));
#endif // USE_MULTIVIEW
				if (neighbour_ang > closest_ang) {
					closest_ang = neighbour_ang;
					closest_coord = neighbour_coord;
				}
			}

			coord = closest_coord;

		} else {
			coord = screen_uv;
		}

#ifdef USE_MULTIVIEW
		vec4 buffer_ambient = textureLod(sampler2DArray(ambient_buffer, SAMPLER_LINEAR_CLAMP), vec3(coord, ViewIndex), 0.0);
		vec4 buffer_reflection = textureLod(sampler2DArray(reflection_buffer, SAMPLER_LINEAR_CLAMP), vec3(coord, ViewIndex), 0.0);
#else // USE_MULTIVIEW
		vec4 buffer_ambient = textureLod(sampler2D(ambient_buffer, SAMPLER_LINEAR_CLAMP), coord, 0.0);
		vec4 buffer_reflection = textureLod(sampler2D(reflection_buffer, SAMPLER_LINEAR_CLAMP), coord, 0.0);
#endif // USE_MULTIVIEW

		ambient_light = mix(ambient_light, buffer_ambient.rgb, buffer_ambient.a);
		specular_light = mix(specular_light, buffer_reflection.rgb, buffer_reflection.a);
	}
#endif // !USE_LIGHTMAP

	if (bool(implementation_data.ss_effects_flags & SCREEN_SPACE_EFFECTS_FLAGS_USE_SSAO)) {
#ifdef USE_MULTIVIEW
		float ssao = texture(sampler2DArray(ao_buffer, SAMPLER_LINEAR_CLAMP), vec3(screen_uv, ViewIndex)).r;
#else
		float ssao = texture(sampler2D(ao_buffer, SAMPLER_LINEAR_CLAMP), screen_uv).r;
#endif
		ao = min(ao, ssao);
		ao_light_affect = mix(ao_light_affect, max(ao_light_affect, implementation_data.ssao_light_affect), implementation_data.ssao_ao_affect);
	}

	{ // process reflections

		vec4 reflection_accum = vec4(0.0, 0.0, 0.0, 0.0);
		vec4 ambient_accum = vec4(0.0, 0.0, 0.0, 0.0);

		uint cluster_reflection_offset = cluster_offset + implementation_data.cluster_type_size * 3;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_reflection_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

#ifdef USE_SUBGROUPS
		item_from = subgroupBroadcastFirst(subgroupMin(item_from));
		item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif

#ifdef LIGHT_ANISOTROPY_USED
		// https://google.github.io/filament/Filament.html#lighting/imagebasedlights/anisotropy
		vec3 anisotropic_direction = anisotropy >= 0.0 ? binormal : tangent;
		vec3 anisotropic_tangent = cross(anisotropic_direction, view);
		vec3 anisotropic_normal = cross(anisotropic_tangent, anisotropic_direction);
		vec3 bent_normal = normalize(mix(normal, anisotropic_normal, abs(anisotropy) * clamp(5.0 * roughness, 0.0, 1.0)));
#else
		vec3 bent_normal = normal;
#endif
		vec3 ref_vec = normalize(reflect(-view, bent_normal));
		ref_vec = mix(ref_vec, bent_normal, roughness * roughness);

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_reflection_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
			uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
			uint merged_mask = mask;
#endif

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);
#ifdef USE_SUBGROUPS
				if (((1u << bit) & mask) == 0) { //do not process if not originally here
					continue;
				}
#endif
				uint reflection_index = 32 * i + bit;

				if (!bool(reflections.data[reflection_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (reflection_accum.a >= 1.0 && ambient_accum.a >= 1.0) {
					break;
				}

				reflection_process(reflection_index, vertex, ref_vec, normal, roughness, ambient_light, specular_light, ambient_accum, reflection_accum);
			}
		}

		if (ambient_accum.a < 1.0) {
			ambient_accum.rgb = mix(ambient_light, ambient_accum.rgb, ambient_accum.a);
		}

		if (reflection_accum.a < 1.0) {
			reflection_accum.rgb = mix(specular_light, reflection_accum.rgb, reflection_accum.a);
		}

		if (reflection_accum.a > 0.0) {
			specular_light = reflection_accum.rgb;
		}

#if !defined(USE_LIGHTMAP)
		if (ambient_accum.a > 0.0) {
			ambient_light = ambient_accum.rgb;
		}
#endif
	}

	//finalize ambient light here
	{
		ambient_light *= albedo.rgb;
		ambient_light *= ao;

		if (bool(implementation_data.ss_effects_flags & SCREEN_SPACE_EFFECTS_FLAGS_USE_SSIL)) {
#ifdef USE_MULTIVIEW
			vec4 ssil = textureLod(sampler2DArray(ssil_buffer, SAMPLER_LINEAR_CLAMP), vec3(screen_uv, ViewIndex), 0.0);
#else
			vec4 ssil = textureLod(sampler2D(ssil_buffer, SAMPLER_LINEAR_CLAMP), screen_uv, 0.0);
#endif // USE_MULTIVIEW
			ambient_light *= 1.0 - ssil.a;
			ambient_light += ssil.rgb * albedo.rgb;
		}
	}
#endif // AMBIENT_LIGHT_DISABLED
	// convert ao to direct light ao
	ao = mix(1.0, ao, ao_light_affect);

	//this saves some VGPRs
	vec3 f0 = F0(metallic, specular, albedo);
#ifndef AMBIENT_LIGHT_DISABLED
	{
#if defined(DIFFUSE_TOON)
		//simplify for toon, as
		specular_light *= specular * metallic * albedo * 2.0;
#else

		// scales the specular reflections, needs to be computed before lighting happens,
		// but after environment, GI, and reflection probes are added
		// Environment brdf approximation (Lazarov 2013)
		// see https://www.unrealengine.com/en-US/blog/physically-based-shading-on-mobile
		const vec4 c0 = vec4(-1.0, -0.0275, -0.572, 0.022);
		const vec4 c1 = vec4(1.0, 0.0425, 1.04, -0.04);
		vec4 r = roughness * c0 + c1;
		float ndotv = clamp(dot(normal, view), 0.0, 1.0);
		float a004 = min(r.x * r.x, exp2(-9.28 * ndotv)) * r.x + r.y;
		vec2 env = vec2(-1.04, 1.04) * a004 + r.zw;

		specular_light *= env.x * f0 + env.y * clamp(50.0 * f0.g, metallic, 1.0);
#endif
	}

#endif // !AMBIENT_LIGHT_DISABLED
#endif //GI !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

#if !defined(MODE_RENDER_DEPTH)
	//this saves some VGPRs
	uint orms = packUnorm4x8(vec4(ao, roughness, metallic, specular));
#endif

// LIGHTING
#if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

#ifdef USE_VERTEX_LIGHTING
	diffuse_light += diffuse_light_interp.rgb;
	specular_light += specular_light_interp.rgb * f0;
#endif

	{ // Directional light.

		// Do shadow and lighting in two passes to reduce register pressure.
#ifndef SHADOWS_DISABLED
		uint shadow0 = 0;
		uint shadow1 = 0;

		float shadowmask = 1.0;

#ifdef USE_LIGHTMAP
		uint shadowmask_mode = LIGHTMAP_SHADOWMASK_MODE_NONE;

		if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
			const uint ofs = instances.data[instance_index].gi_offset & 0xFFFF;
			shadowmask_mode = lightmaps.data[ofs].flags;

			if (shadowmask_mode != LIGHTMAP_SHADOWMASK_MODE_NONE) {
				const uint slice = instances.data[instance_index].gi_offset >> 16;
				const vec2 scaled_uv = uv2 * instances.data[instance_index].lightmap_uv_scale.zw + instances.data[instance_index].lightmap_uv_scale.xy;
				const vec3 uvw = vec3(scaled_uv, float(slice));

				if (sc_use_lightmap_bicubic_filter()) {
					shadowmask = textureArray_bicubic(lightmap_textures[MAX_LIGHTMAP_TEXTURES + ofs], uvw, lightmaps.data[ofs].light_texture_size).x;
				} else {
					shadowmask = textureLod(sampler2DArray(lightmap_textures[MAX_LIGHTMAP_TEXTURES + ofs], SAMPLER_LINEAR_CLAMP), uvw, 0.0).x;
				}
			}
		}

		if (shadowmask_mode != LIGHTMAP_SHADOWMASK_MODE_ONLY) {
#endif // USE_LIGHTMAP

#ifdef USE_VERTEX_LIGHTING
			// Only process the first light's shadow for vertex lighting.
			for (uint i = 0; i < 1; i++) {
#else
		for (uint i = 0; i < 8; i++) {
			if (i >= scene_data.directional_light_count) {
				break;
			}
#endif

				if (!bool(directional_lights.data[i].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (directional_lights.data[i].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
					continue; // Statically baked light and object uses lightmap, skip
				}

				float shadow = 1.0;

				if (directional_lights.data[i].shadow_opacity > 0.001) {
					float depth_z = -vertex.z;
					vec3 light_dir = directional_lights.data[i].direction;
					vec3 base_normal_bias = geo_normal * (1.0 - max(0.0, dot(light_dir, -geo_normal)));

#define BIAS_FUNC(m_var, m_idx)                                                                 \
	m_var.xyz += light_dir * directional_lights.data[i].shadow_bias[m_idx];                     \
	vec3 normal_bias = base_normal_bias * directional_lights.data[i].shadow_normal_bias[m_idx]; \
	normal_bias -= light_dir * dot(light_dir, normal_bias);                                     \
	m_var.xyz += normal_bias;

					//version with soft shadows, more expensive
					if (sc_use_directional_soft_shadows() && directional_lights.data[i].softshadow_angle > 0) {
						uint blend_count = 0;
						const uint blend_max = directional_lights.data[i].blend_splits ? 2 : 1;

						if (depth_z < directional_lights.data[i].shadow_split_offsets.x) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 0)

							vec4 pssm_coord = (directional_lights.data[i].shadow_matrix1 * v);
							pssm_coord /= pssm_coord.w;

							float range_pos = dot(directional_lights.data[i].direction, v.xyz);
							float range_begin = directional_lights.data[i].shadow_range_begin.x;
							float test_radius = (range_pos - range_begin) * directional_lights.data[i].softshadow_angle;
							vec2 tex_scale = directional_lights.data[i].uv_scale1 * test_radius;
							shadow = sample_directional_soft_shadow(directional_shadow_atlas, pssm_coord.xyz, tex_scale * directional_lights.data[i].soft_shadow_scale, scene_data.taa_frame_count);
							blend_count++;
						}

						if (blend_count < blend_max && depth_z < directional_lights.data[i].shadow_split_offsets.y) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 1)

							vec4 pssm_coord = (directional_lights.data[i].shadow_matrix2 * v);
							pssm_coord /= pssm_coord.w;

							float range_pos = dot(directional_lights.data[i].direction, v.xyz);
							float range_begin = directional_lights.data[i].shadow_range_begin.y;
							float test_radius = (range_pos - range_begin) * directional_lights.data[i].softshadow_angle;
							vec2 tex_scale = directional_lights.data[i].uv_scale2 * test_radius;
							float s = sample_directional_soft_shadow(directional_shadow_atlas, pssm_coord.xyz, tex_scale * directional_lights.data[i].soft_shadow_scale, scene_data.taa_frame_count);

							if (blend_count == 0) {
								shadow = s;
							} else {
								//blend
								float blend = smoothstep(0.0, directional_lights.data[i].shadow_split_offsets.x, depth_z);
								shadow = mix(shadow, s, blend);
							}

							blend_count++;
						}

						if (blend_count < blend_max && depth_z < directional_lights.data[i].shadow_split_offsets.z) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 2)

							vec4 pssm_coord = (directional_lights.data[i].shadow_matrix3 * v);
							pssm_coord /= pssm_coord.w;

							float range_pos = dot(directional_lights.data[i].direction, v.xyz);
							float range_begin = directional_lights.data[i].shadow_range_begin.z;
							float test_radius = (range_pos - range_begin) * directional_lights.data[i].softshadow_angle;
							vec2 tex_scale = directional_lights.data[i].uv_scale3 * test_radius;
							float s = sample_directional_soft_shadow(directional_shadow_atlas, pssm_coord.xyz, tex_scale * directional_lights.data[i].soft_shadow_scale, scene_data.taa_frame_count);

							if (blend_count == 0) {
								shadow = s;
							} else {
								//blend
								float blend = smoothstep(directional_lights.data[i].shadow_split_offsets.x, directional_lights.data[i].shadow_split_offsets.y, depth_z);
								shadow = mix(shadow, s, blend);
							}

							blend_count++;
						}

						if (blend_count < blend_max) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 3)

							vec4 pssm_coord = (directional_lights.data[i].shadow_matrix4 * v);
							pssm_coord /= pssm_coord.w;

							float range_pos = dot(directional_lights.data[i].direction, v.xyz);
							float range_begin = directional_lights.data[i].shadow_range_begin.w;
							float test_radius = (range_pos - range_begin) * directional_lights.data[i].softshadow_angle;
							vec2 tex_scale = directional_lights.data[i].uv_scale4 * test_radius;
							float s = sample_directional_soft_shadow(directional_shadow_atlas, pssm_coord.xyz, tex_scale * directional_lights.data[i].soft_shadow_scale, scene_data.taa_frame_count);

							if (blend_count == 0) {
								shadow = s;
							} else {
								//blend
								float blend = smoothstep(directional_lights.data[i].shadow_split_offsets.y, directional_lights.data[i].shadow_split_offsets.z, depth_z);
								shadow = mix(shadow, s, blend);
							}
						}

					} else { //no soft shadows

						vec4 pssm_coord;
						float blur_factor;

						if (depth_z < directional_lights.data[i].shadow_split_offsets.x) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 0)

							pssm_coord = (directional_lights.data[i].shadow_matrix1 * v);
							blur_factor = 1.0;
						} else if (depth_z < directional_lights.data[i].shadow_split_offsets.y) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 1)

							pssm_coord = (directional_lights.data[i].shadow_matrix2 * v);
							// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
							blur_factor = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.y;
						} else if (depth_z < directional_lights.data[i].shadow_split_offsets.z) {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 2)

							pssm_coord = (directional_lights.data[i].shadow_matrix3 * v);
							// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
							blur_factor = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.z;
						} else {
							vec4 v = vec4(vertex, 1.0);

							BIAS_FUNC(v, 3)

							pssm_coord = (directional_lights.data[i].shadow_matrix4 * v);
							// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
							blur_factor = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.w;
						}

						pssm_coord /= pssm_coord.w;

						shadow = sample_directional_pcf_shadow(directional_shadow_atlas, scene_data.directional_shadow_pixel_size * directional_lights.data[i].soft_shadow_scale * (blur_factor + (1.0 - blur_factor) * float(directional_lights.data[i].blend_splits)), pssm_coord, scene_data.taa_frame_count);

						if (directional_lights.data[i].blend_splits) {
							float pssm_blend;
							float blur_factor2;

							if (depth_z < directional_lights.data[i].shadow_split_offsets.x) {
								vec4 v = vec4(vertex, 1.0);
								BIAS_FUNC(v, 1)
								pssm_coord = (directional_lights.data[i].shadow_matrix2 * v);
								pssm_blend = smoothstep(directional_lights.data[i].shadow_split_offsets.x - directional_lights.data[i].shadow_split_offsets.x * 0.1, directional_lights.data[i].shadow_split_offsets.x, depth_z);
								// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
								blur_factor2 = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.y;
							} else if (depth_z < directional_lights.data[i].shadow_split_offsets.y) {
								vec4 v = vec4(vertex, 1.0);
								BIAS_FUNC(v, 2)
								pssm_coord = (directional_lights.data[i].shadow_matrix3 * v);
								pssm_blend = smoothstep(directional_lights.data[i].shadow_split_offsets.y - directional_lights.data[i].shadow_split_offsets.y * 0.1, directional_lights.data[i].shadow_split_offsets.y, depth_z);
								// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
								blur_factor2 = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.z;
							} else if (depth_z < directional_lights.data[i].shadow_split_offsets.z) {
								vec4 v = vec4(vertex, 1.0);
								BIAS_FUNC(v, 3)
								pssm_coord = (directional_lights.data[i].shadow_matrix4 * v);
								pssm_blend = smoothstep(directional_lights.data[i].shadow_split_offsets.z - directional_lights.data[i].shadow_split_offsets.z * 0.1, directional_lights.data[i].shadow_split_offsets.z, depth_z);
								// Adjust shadow blur with reference to the first split to reduce discrepancy between shadow splits.
								blur_factor2 = directional_lights.data[i].shadow_split_offsets.x / directional_lights.data[i].shadow_split_offsets.w;
							} else {
								pssm_blend = 0.0; //if no blend, same coord will be used (divide by z will result in same value, and already cached)
								blur_factor2 = 1.0;
							}

							pssm_coord /= pssm_coord.w;

							float shadow2 = sample_directional_pcf_shadow(directional_shadow_atlas, scene_data.directional_shadow_pixel_size * directional_lights.data[i].soft_shadow_scale * (blur_factor2 + (1.0 - blur_factor2) * float(directional_lights.data[i].blend_splits)), pssm_coord, scene_data.taa_frame_count);
							shadow = mix(shadow, shadow2, pssm_blend);
						}
					}

#ifdef USE_LIGHTMAP
					if (shadowmask_mode == LIGHTMAP_SHADOWMASK_MODE_REPLACE) {
						shadow = mix(shadow, shadowmask, smoothstep(directional_lights.data[i].fade_from, directional_lights.data[i].fade_to, vertex.z)); //done with negative values for performance
					} else if (shadowmask_mode == LIGHTMAP_SHADOWMASK_MODE_OVERLAY) {
						shadow = shadowmask * mix(shadow, 1.0, smoothstep(directional_lights.data[i].fade_from, directional_lights.data[i].fade_to, vertex.z)); //done with negative values for performance
					} else {
#endif
						shadow = mix(shadow, 1.0, smoothstep(directional_lights.data[i].fade_from, directional_lights.data[i].fade_to, vertex.z)); //done with negative values for performance
#ifdef USE_LIGHTMAP
					}
#endif

#ifdef USE_VERTEX_LIGHTING
					diffuse_light *= mix(1.0, shadow, diffuse_light_interp.a);
					specular_light *= mix(1.0, shadow, specular_light_interp.a);
#endif

#undef BIAS_FUNC
				} // shadows

				if (i < 4) {
					shadow0 |= uint(clamp(shadow * 255.0, 0.0, 255.0)) << (i * 8);
				} else {
					shadow1 |= uint(clamp(shadow * 255.0, 0.0, 255.0)) << ((i - 4) * 8);
				}
			}

#ifdef USE_LIGHTMAP
		} else { // shadowmask_mode == LIGHTMAP_SHADOWMASK_MODE_ONLY

#ifdef USE_VERTEX_LIGHTING
			diffuse_light *= mix(1.0, shadowmask, diffuse_light_interp.a);
			specular_light *= mix(1.0, shadowmask, specular_light_interp.a);
#endif

			shadow0 |= uint(clamp(shadowmask * 255.0, 0.0, 255.0));
		}
#endif // USE_LIGHTMAP

#endif // SHADOWS_DISABLED

#ifndef USE_VERTEX_LIGHTING

		for (uint i = 0; i < 8; i++) {
			if (i >= scene_data.directional_light_count) {
				break;
			}

			if (!bool(directional_lights.data[i].mask & instances.data[instance_index].layer_mask)) {
				continue; //not masked
			}

			if (directional_lights.data[i].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
				continue; // Statically baked light and object uses lightmap, skip
			}

#ifdef LIGHT_TRANSMITTANCE_USED
			float transmittance_z = transmittance_depth;
#ifndef SHADOWS_DISABLED
			if (directional_lights.data[i].shadow_opacity > 0.001) {
				float depth_z = -vertex.z;

				if (depth_z < directional_lights.data[i].shadow_split_offsets.x) {
					vec4 trans_vertex = vec4(vertex - geo_normal * directional_lights.data[i].shadow_transmittance_bias.x, 1.0);
					vec4 trans_coord = directional_lights.data[i].shadow_matrix1 * trans_vertex;
					trans_coord /= trans_coord.w;

					float shadow_z = textureLod(sampler2D(directional_shadow_atlas, SAMPLER_LINEAR_CLAMP), trans_coord.xy, 0.0).r;
					shadow_z *= directional_lights.data[i].shadow_z_range.x;
					float z = trans_coord.z * directional_lights.data[i].shadow_z_range.x;

					transmittance_z = z - shadow_z;
				} else if (depth_z < directional_lights.data[i].shadow_split_offsets.y) {
					vec4 trans_vertex = vec4(vertex - geo_normal * directional_lights.data[i].shadow_transmittance_bias.y, 1.0);
					vec4 trans_coord = directional_lights.data[i].shadow_matrix2 * trans_vertex;
					trans_coord /= trans_coord.w;

					float shadow_z = textureLod(sampler2D(directional_shadow_atlas, SAMPLER_LINEAR_CLAMP), trans_coord.xy, 0.0).r;
					shadow_z *= directional_lights.data[i].shadow_z_range.y;
					float z = trans_coord.z * directional_lights.data[i].shadow_z_range.y;

					transmittance_z = z - shadow_z;
				} else if (depth_z < directional_lights.data[i].shadow_split_offsets.z) {
					vec4 trans_vertex = vec4(vertex - geo_normal * directional_lights.data[i].shadow_transmittance_bias.z, 1.0);
					vec4 trans_coord = directional_lights.data[i].shadow_matrix3 * trans_vertex;
					trans_coord /= trans_coord.w;

					float shadow_z = textureLod(sampler2D(directional_shadow_atlas, SAMPLER_LINEAR_CLAMP), trans_coord.xy, 0.0).r;
					shadow_z *= directional_lights.data[i].shadow_z_range.z;
					float z = trans_coord.z * directional_lights.data[i].shadow_z_range.z;

					transmittance_z = z - shadow_z;
				} else {
					vec4 trans_vertex = vec4(vertex - geo_normal * directional_lights.data[i].shadow_transmittance_bias.w, 1.0);
					vec4 trans_coord = directional_lights.data[i].shadow_matrix4 * trans_vertex;
					trans_coord /= trans_coord.w;

					float shadow_z = textureLod(sampler2D(directional_shadow_atlas, SAMPLER_LINEAR_CLAMP), trans_coord.xy, 0.0).r;
					shadow_z *= directional_lights.data[i].shadow_z_range.w;
					float z = trans_coord.z * directional_lights.data[i].shadow_z_range.w;

					transmittance_z = z - shadow_z;
				}
			}
#endif // !SHADOWS_DISABLED
#endif // LIGHT_TRANSMITTANCE_USED

			float shadow = 1.0;
#ifndef SHADOWS_DISABLED
			if (i < 4) {
				shadow = float(shadow0 >> (i * 8u) & 0xFFu) / 255.0;
			} else {
				shadow = float(shadow1 >> ((i - 4u) * 8u) & 0xFFu) / 255.0;
			}

			shadow = mix(1.0, shadow, directional_lights.data[i].shadow_opacity);
#endif

			blur_shadow(shadow);

#ifdef DEBUG_DRAW_PSSM_SPLITS
			vec3 tint = vec3(1.0);
			if (-vertex.z < directional_lights.data[i].shadow_split_offsets.x) {
				tint = vec3(1.0, 0.0, 0.0);
			} else if (-vertex.z < directional_lights.data[i].shadow_split_offsets.y) {
				tint = vec3(0.0, 1.0, 0.0);
			} else if (-vertex.z < directional_lights.data[i].shadow_split_offsets.z) {
				tint = vec3(0.0, 0.0, 1.0);
			} else {
				tint = vec3(1.0, 1.0, 0.0);
			}
			tint = mix(tint, vec3(1.0), shadow);
			shadow = 1.0;
#endif

			float size_A = sc_use_directional_soft_shadows() ? directional_lights.data[i].size : 0.0;

			light_compute(normal, directional_lights.data[i].direction, normalize(view), size_A,
#ifndef DEBUG_DRAW_PSSM_SPLITS
					directional_lights.data[i].color * directional_lights.data[i].energy,
#else
					directional_lights.data[i].color * directional_lights.data[i].energy * tint,
#endif
					true, shadow, f0, orms, directional_lights.data[i].specular, albedo, alpha, screen_uv,
#ifdef LIGHT_BACKLIGHT_USED
					backlight,
#endif
#ifdef LIGHT_TRANSMITTANCE_USED
					transmittance_color,
					transmittance_depth,
					transmittance_boost,
					transmittance_z,
#endif
#ifdef LIGHT_RIM_USED
					rim, rim_tint,
#endif
#ifdef LIGHT_CLEARCOAT_USED
					clearcoat, clearcoat_roughness, geo_normal,
#endif // LIGHT_CLEARCOAT_USED
#ifdef LIGHT_ANISOTROPY_USED
					binormal,
					tangent, anisotropy,
#endif
					diffuse_light,
					specular_light);
		}
#endif // USE_VERTEX_LIGHTING
	}

#ifndef USE_VERTEX_LIGHTING
	{ //omni lights

		uint cluster_omni_offset = cluster_offset;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_omni_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

#ifdef USE_SUBGROUPS
		item_from = subgroupBroadcastFirst(subgroupMin(item_from));
		item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_omni_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
			uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
			uint merged_mask = mask;
#endif

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);
#ifdef USE_SUBGROUPS
				if (((1u << bit) & mask) == 0) { //do not process if not originally here
					continue;
				}
#endif
				uint light_index = 32 * i + bit;

				if (!bool(omni_lights.data[light_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (omni_lights.data[light_index].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
					continue; // Statically baked light and object uses lightmap, skip
				}

				light_process_omni(light_index, vertex, view, normal, vertex_ddx, vertex_ddy, f0, orms, scene_data.taa_frame_count, albedo, alpha, screen_uv,
#ifdef LIGHT_BACKLIGHT_USED
						backlight,
#endif
#ifdef LIGHT_TRANSMITTANCE_USED
						transmittance_color,
						transmittance_depth,
						transmittance_boost,
#endif
#ifdef LIGHT_RIM_USED
						rim,
						rim_tint,
#endif
#ifdef LIGHT_CLEARCOAT_USED
						clearcoat, clearcoat_roughness, geo_normal,
#endif // LIGHT_CLEARCOAT_USED
#ifdef LIGHT_ANISOTROPY_USED
						tangent, binormal, anisotropy,
#endif
						diffuse_light, specular_light);
			}
		}
	}

	{ //spot lights

		uint cluster_spot_offset = cluster_offset + implementation_data.cluster_type_size;

		uint item_min;
		uint item_max;
		uint item_from;
		uint item_to;

		cluster_get_item_range(cluster_spot_offset + implementation_data.max_cluster_element_count_div_32 + cluster_z, item_min, item_max, item_from, item_to);

#ifdef USE_SUBGROUPS
		item_from = subgroupBroadcastFirst(subgroupMin(item_from));
		item_to = subgroupBroadcastFirst(subgroupMax(item_to));
#endif

		for (uint i = item_from; i < item_to; i++) {
			uint mask = cluster_buffer.data[cluster_spot_offset + i];
			mask &= cluster_get_range_clip_mask(i, item_min, item_max);
#ifdef USE_SUBGROUPS
			uint merged_mask = subgroupBroadcastFirst(subgroupOr(mask));
#else
			uint merged_mask = mask;
#endif

			while (merged_mask != 0) {
				uint bit = findMSB(merged_mask);
				merged_mask &= ~(1u << bit);
#ifdef USE_SUBGROUPS
				if (((1u << bit) & mask) == 0) { //do not process if not originally here
					continue;
				}
#endif

				uint light_index = 32 * i + bit;

				if (!bool(spot_lights.data[light_index].mask & instances.data[instance_index].layer_mask)) {
					continue; //not masked
				}

				if (spot_lights.data[light_index].bake_mode == LIGHT_BAKE_STATIC && bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_LIGHTMAP)) {
					continue; // Statically baked light and object uses lightmap, skip
				}

				light_process_spot(light_index, vertex, view, normal, vertex_ddx, vertex_ddy, f0, orms, scene_data.taa_frame_count, albedo, alpha, screen_uv,
#ifdef LIGHT_BACKLIGHT_USED
						backlight,
#endif
#ifdef LIGHT_TRANSMITTANCE_USED
						transmittance_color,
						transmittance_depth,
						transmittance_boost,
#endif
#ifdef LIGHT_RIM_USED
						rim,
						rim_tint,
#endif
#ifdef LIGHT_CLEARCOAT_USED
						clearcoat, clearcoat_roughness, geo_normal,
#endif // LIGHT_CLEARCOAT_USED
#ifdef LIGHT_ANISOTROPY_USED
						tangent,
						binormal, anisotropy,
#endif
						diffuse_light, specular_light);
			}
		}
	}
#endif // !USE_VERTEX_LIGHTING
#endif //!defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)

#ifdef USE_SHADOW_TO_OPACITY
#ifndef MODE_RENDER_DEPTH
	alpha = min(alpha, clamp(length(ambient_light), 0.0, 1.0));

#if defined(ALPHA_SCISSOR_USED)
#ifdef MODE_RENDER_MATERIAL
	if (alpha < alpha_scissor_threshold) {
		alpha = 0.0;
	} else {
		alpha = 1.0;
	}
#else
	if (alpha < alpha_scissor_threshold) {
		discard;
	}
#endif // MODE_RENDER_MATERIAL
#endif // ALPHA_SCISSOR_USED

#endif // !MODE_RENDER_DEPTH
#endif // USE_SHADOW_TO_OPACITY

#ifdef MODE_RENDER_DEPTH

#ifdef MODE_RENDER_SDF

	{
		vec3 local_pos = (implementation_data.sdf_to_bounds * vec4(vertex, 1.0)).xyz;
		ivec3 grid_pos = implementation_data.sdf_offset + ivec3(local_pos * vec3(implementation_data.sdf_size));

		uint albedo16 = 0x1; //solid flag
		albedo16 |= clamp(uint(albedo.r * 31.0), 0, 31) << 11;
		albedo16 |= clamp(uint(albedo.g * 31.0), 0, 31) << 6;
		albedo16 |= clamp(uint(albedo.b * 31.0), 0, 31) << 1;

		imageStore(albedo_volume_grid, grid_pos, uvec4(albedo16));

		uint facing_bits = 0;
		const vec3 aniso_dir[6] = vec3[](
				vec3(1, 0, 0),
				vec3(0, 1, 0),
				vec3(0, 0, 1),
				vec3(-1, 0, 0),
				vec3(0, -1, 0),
				vec3(0, 0, -1));

		vec3 cam_normal = mat3(scene_data.inv_view_matrix) * normalize(normal_interp);

		float closest_dist = -1e20;

		for (uint i = 0; i < 6; i++) {
			float d = dot(cam_normal, aniso_dir[i]);
			if (d > closest_dist) {
				closest_dist = d;
				facing_bits = (1 << i);
			}
		}

#ifdef NO_IMAGE_ATOMICS
		imageStore(geom_facing_grid, grid_pos, uvec4(imageLoad(geom_facing_grid, grid_pos).r | facing_bits)); //store facing bits
#else
		imageAtomicOr(geom_facing_grid, grid_pos, facing_bits); //store facing bits
#endif

		if (length(emission) > 0.001) {
			float lumas[6];
			vec3 light_total = vec3(0);

			for (int i = 0; i < 6; i++) {
				float strength = max(0.0, dot(cam_normal, aniso_dir[i]));
				vec3 light = emission * strength;
				light_total += light;
				lumas[i] = max(light.r, max(light.g, light.b));
			}

			float luma_total = max(light_total.r, max(light_total.g, light_total.b));

			uint light_aniso = 0;

			for (int i = 0; i < 6; i++) {
				light_aniso |= min(31, uint((lumas[i] / luma_total) * 31.0)) << (i * 5);
			}

			//compress to RGBE9995 to save space

			const float pow2to9 = 512.0f;
			const float B = 15.0f;
			const float N = 9.0f;
			const float LN2 = 0.6931471805599453094172321215;

			float cRed = clamp(light_total.r, 0.0, 65408.0);
			float cGreen = clamp(light_total.g, 0.0, 65408.0);
			float cBlue = clamp(light_total.b, 0.0, 65408.0);

			float cMax = max(cRed, max(cGreen, cBlue));

			float expp = max(-B - 1.0f, floor(log(cMax) / LN2)) + 1.0f + B;

			float sMax = floor((cMax / pow(2.0f, expp - B - N)) + 0.5f);

			float exps = expp + 1.0f;

			if (0.0 <= sMax && sMax < pow2to9) {
				exps = expp;
			}

			float sRed = floor((cRed / pow(2.0f, exps - B - N)) + 0.5f);
			float sGreen = floor((cGreen / pow(2.0f, exps - B - N)) + 0.5f);
			float sBlue = floor((cBlue / pow(2.0f, exps - B - N)) + 0.5f);
			//store as 8985 to have 2 extra neighbor bits
			uint light_rgbe = ((uint(sRed) & 0x1FFu) >> 1) | ((uint(sGreen) & 0x1FFu) << 8) | (((uint(sBlue) & 0x1FFu) >> 1) << 17) | ((uint(exps) & 0x1Fu) << 25);

			imageStore(emission_grid, grid_pos, uvec4(light_rgbe));
			imageStore(emission_aniso_grid, grid_pos, uvec4(light_aniso));
		}
	}

#endif

#ifdef MODE_RENDER_MATERIAL

	albedo_output_buffer.rgb = albedo;
	albedo_output_buffer.a = alpha;

	normal_output_buffer.rgb = encode24(normal) * 0.5 + 0.5;
	normal_output_buffer.a = 0.0;
	depth_output_buffer.r = -vertex.z;

	orm_output_buffer.r = ao;
	orm_output_buffer.g = roughness;
	orm_output_buffer.b = metallic;
	orm_output_buffer.a = sss_strength;

	emission_output_buffer.rgb = emission;
	emission_output_buffer.a = 0.0;
#endif

#ifdef MODE_RENDER_NORMAL_ROUGHNESS
	normal_roughness_output_buffer = vec4(encode24(normal) * 0.5 + 0.5, roughness);

	// We encode the dynamic static into roughness.
	// Values over 0.5 are dynamic, under 0.5 are static.
	normal_roughness_output_buffer.w = normal_roughness_output_buffer.w * (127.0 / 255.0);
	if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_DYNAMIC)) {
		normal_roughness_output_buffer.w = 1.0 - normal_roughness_output_buffer.w;
	}
	normal_roughness_output_buffer.w = normal_roughness_output_buffer.w;

#ifdef MODE_RENDER_VOXEL_GI
	if (bool(instances.data[instance_index].flags & INSTANCE_FLAGS_USE_VOXEL_GI)) { // process voxel_gi_instances
		uint index1 = instances.data[instance_index].gi_offset & 0xFFFF;
		uint index2 = instances.data[instance_index].gi_offset >> 16;
		voxel_gi_buffer.x = index1 & 0xFFu;
		voxel_gi_buffer.y = index2 & 0xFFu;
	} else {
		voxel_gi_buffer.x = 0xFF;
		voxel_gi_buffer.y = 0xFF;
	}
#endif

#endif //MODE_RENDER_NORMAL_ROUGHNESS

//nothing happens, so a tree-ssa optimizer will result in no fragment shader :)
#else

	// multiply by albedo
	diffuse_light *= albedo; // ambient must be multiplied by albedo at the end

	// apply direct light AO
	ao = unpackUnorm4x8(orms).x;
	specular_light *= ao;
	diffuse_light *= ao;

	// apply metallic
	metallic = unpackUnorm4x8(orms).z;
	diffuse_light *= 1.0 - metallic;
	ambient_light *= 1.0 - metallic;

#ifndef FOG_DISABLED
	//restore fog
	fog = vec4(unpackHalf2x16(fog_rg), unpackHalf2x16(fog_ba));
#endif //!FOG_DISABLED

#ifdef MODE_SEPARATE_SPECULAR

#ifdef MODE_UNSHADED
	diffuse_buffer = vec4(albedo.rgb, 0.0);
	specular_buffer = vec4(0.0);

#else

#ifdef SSS_MODE_SKIN
	sss_strength = -sss_strength;
#endif
	diffuse_buffer = vec4(emission + diffuse_light + ambient_light, sss_strength);
	specular_buffer = vec4(specular_light, metallic);
#endif

#ifndef FOG_DISABLED
	diffuse_buffer.rgb = mix(diffuse_buffer.rgb, fog.rgb, fog.a);
	specular_buffer.rgb = mix(specular_buffer.rgb, vec3(0.0), fog.a);
#endif //!FOG_DISABLED

#else //MODE_SEPARATE_SPECULAR

	alpha *= scene_data.pass_alpha_multiplier;

#ifdef MODE_UNSHADED
	frag_color = vec4(albedo, alpha);
#else
	frag_color = vec4(emission + ambient_light + diffuse_light + specular_light, alpha);
//frag_color = vec4(1.0);
#endif //USE_NO_SHADING

#ifndef FOG_DISABLED
	// Draw "fixed" fog before volumetric fog to ensure volumetric fog can appear in front of the sky.
	frag_color.rgb = mix(frag_color.rgb, fog.rgb, fog.a);
#endif //!FOG_DISABLED

#endif //MODE_SEPARATE_SPECULAR

#endif //MODE_RENDER_DEPTH
#ifdef MOTION_VECTORS
	vec2 position_clip = (screen_position.xy / screen_position.w) - scene_data.taa_jitter;
	vec2 prev_position_clip = (prev_screen_position.xy / prev_screen_position.w) - scene_data_block.prev_data.taa_jitter;

	vec2 position_uv = position_clip * vec2(0.5, 0.5);
	vec2 prev_position_uv = prev_position_clip * vec2(0.5, 0.5);

	motion_vector = prev_position_uv - position_uv;
#endif

#if defined(PREMUL_ALPHA_USED) && !defined(MODE_RENDER_DEPTH)
	frag_color.rgb *= premul_alpha;
#endif //PREMUL_ALPHA_USED
}

void main() {
#ifdef UBERSHADER
	bool front_facing = gl_FrontFacing;
	if (uc_cull_mode() == POLYGON_CULL_BACK && !front_facing) {
		discard;
	} else if (uc_cull_mode() == POLYGON_CULL_FRONT && front_facing) {
		discard;
	}
#endif
#ifdef MODE_DUAL_PARABOLOID

	if (dp_clip > 0.0) {
		discard;
	}
#endif

	fragment_shader(scene_data_block.data);
}
