Differential D10390 Diff 33913 source/blender/draw/engines/eevee/shaders/common_utiltex_lib.glsl

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source/blender/draw/engines/eevee/shaders/common_utiltex_lib.glsl


	#pragma BLENDER_REQUIRE(bsdf_common_lib.glsl)			#pragma BLENDER_REQUIRE(bsdf_common_lib.glsl)

	/* ---------------------------------------------------------------------- */			/* ---------------------------------------------------------------------- */
	/** \name Utiltex			/** \name Utiltex
	*			*
	* Utiltex is a sampler2DArray that stores a number of useful small utilitary textures and lookup			* Utiltex is a sampler2DArray that stores a number of useful small utilitary textures and lookup
	* tables.			* tables.
	* \{ */			* \{ */

	uniform sampler2DArray utilTex;			uniform sampler2DArray utilTex;

	#define LUT_SIZE 64			#define LUT_SIZE 64

	#define texelfetch_noise_tex(coord) texelFetch(utilTex, ivec3(ivec2(coord) % LUT_SIZE, 2.0), 0)			#define LTC_MAT_LAYER 0
				#define LTC_BRDF_LAYER 1
				#define BRDF_LUT_LAYER 1
				#define NOISE_LAYER 2
				#define LTC_DISK_LAYER 3 /* UNUSED */
				/* Layers 4 to 20 are for BTDF Lut. */

				#define texelfetch_noise_tex(coord) \
				texelFetch(utilTex, ivec3(ivec2(coord) % LUT_SIZE, NOISE_LAYER), 0)

	/* Return texture coordinates to sample Surface LUT */			/* Return texture coordinates to sample Surface LUT */
	vec2 lut_coords(float cosTheta, float roughness)			vec2 lut_coords(float cosTheta, float roughness)
	{			{
				/* TODO(fclem) Ugly Acos here. Get rid ot this. Should use same mapping as lut_coords_ltc. */
	float theta = acos(cosTheta);			float theta = acos(cosTheta);
	vec2 coords = vec2(roughness, theta / M_PI_2);			vec2 coords = vec2(roughness, theta / M_PI_2);

	/* scale and bias coordinates, for correct filtered lookup */			/* scale and bias coordinates, for correct filtered lookup */
	return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;			return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;
	}			}

	vec2 lut_coords_ltc(float cosTheta, float roughness)			vec2 lut_coords_ltc(float cosTheta, float roughness)
	{			{
	vec2 coords = vec2(roughness, sqrt(1.0 - cosTheta));			vec2 coords = vec2(roughness, sqrt(1.0 - cosTheta));

	/* scale and bias coordinates, for correct filtered lookup */			/* scale and bias coordinates, for correct filtered lookup */
	return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;			return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;
	}			}

				vec2 brdf_lut(float cosTheta, float roughness)
				{
				return textureLod(utilTex, vec3(lut_coords(cosTheta, roughness), BRDF_LUT_LAYER), 0.0).rg;
				}

	float get_btdf_lut(float NV, float roughness, float ior)			float get_btdf_lut(float NV, float roughness, float ior)
	{			{
	const vec3 lut_scale_bias_texel_size = vec3((LUT_SIZE - 1.0), 0.5, 1.5) / LUT_SIZE;			const vec3 lut_scale_bias_texel_size = vec3((LUT_SIZE - 1.0), 0.5, 1.5) / LUT_SIZE;

	vec3 coords;			vec3 coords;
	/* Try to compensate for the low resolution and interpolation error. */			/* Try to compensate for the low resolution and interpolation error. */
	coords.x = (ior > 1.0) ? (0.9 + lut_scale_bias_texel_size.z) +			coords.x = (ior > 1.0) ? (0.9 + lut_scale_bias_texel_size.z) +
	(0.1 - lut_scale_bias_texel_size.z) * f0_from_ior(ior) :			(0.1 - lut_scale_bias_texel_size.z) * f0_from_ior(ior) :
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