Differential D16243 Diff 58431 source/blender/draw/engines/eevee/shaders/ltc_lib.glsl

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

	/**			/**
	* Adapted from :			* Adapted from :
	* Real-Time Polygonal-Light Shading with Linearly Transformed Cosines.			* Real-Time Polygonal-Light Shading with Linearly Transformed Cosines.
	* Eric Heitz, Jonathan Dupuy, Stephen Hill and David Neubelt.			* Eric Heitz, Jonathan Dupuy, Stephen Hill and David Neubelt.
	* ACM Transactions on Graphics (Proceedings of ACM SIGGRAPH 2016) 35(4), 2016.			* ACM Transactions on Graphics (Proceedings of ACM SIGGRAPH 2016) 35(4), 2016.
	* Project page: https://eheitzresearch.wordpress.com/415-2/			* Project page: https://eheitzresearch.wordpress.com/415-2/
	*/			*/

				/* Ensure common_utiltex_lib is included first. */
				#pragma BLENDER_REQUIRE(common_utiltex_lib.glsl)

	#define USE_LTC			#define USE_LTC

	/* Diffuse clipped sphere integral. */			/* Diffuse clipped sphere integral. */
	float diffuse_sphere_integral(float avg_dir_z, float form_factor)			float diffuse_sphere_integral(float avg_dir_z, float form_factor)
	{			{
	#if 1			#if 1
	/* use tabulated horizon-clipped sphere */			/* use tabulated horizon-clipped sphere */
	vec2 uv = vec2(avg_dir_z * 0.5 + 0.5, form_factor);			vec2 uv = vec2(avg_dir_z * 0.5 + 0.5, form_factor);
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	mat3 ltc_matrix(vec4 lut)			mat3 ltc_matrix(vec4 lut)
	{			{
	/* load inverse matrix */			/* load inverse matrix */
	mat3 Minv = mat3(vec3(lut.x, 0, lut.y), vec3(0, 1, 0), vec3(lut.z, 0, lut.w));			mat3 Minv = mat3(vec3(lut.x, 0, lut.y), vec3(0, 1, 0), vec3(lut.z, 0, lut.w));

	return Minv;			return Minv;
	}			}

				#ifdef GPU_METAL
				void ltc_transform_quad(vec3 N, vec3 V, mat3 Minv, thread vec3 *corners)
				#else
	void ltc_transform_quad(vec3 N, vec3 V, mat3 Minv, inout vec3 corners[4])			void ltc_transform_quad(vec3 N, vec3 V, mat3 Minv, inout vec3 corners[4])
				#endif
	{			{
	/* Avoid dot(N, V) == 1 in ortho mode, leading T1 normalize to fail. */			/* Avoid dot(N, V) == 1 in ortho mode, leading T1 normalize to fail. */
	V = normalize(V + 1e-8);			V = normalize(V + 1e-8);

	/* construct orthonormal basis around N */			/* construct orthonormal basis around N */
	vec3 T1, T2;			vec3 T1, T2;
	T1 = normalize(V - N * dot(N, V));			T1 = normalize(V - N * dot(N, V));
	T2 = cross(N, T1);			T2 = cross(N, T1);
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