Differential D4455 Diff 14273 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/
**/		*/

#define USE_LTC		#define USE_LTC

#ifndef UTIL_TEX		#ifndef UTIL_TEX
#define UTIL_TEX		#define UTIL_TEX
uniform sampler2DArray utilTex;		uniform sampler2DArray utilTex;
#define texelfetch_noise_tex(coord) texelFetch(utilTex, ivec3(ivec2(coord) % LUT_SIZE, 2.0), 0)		#define texelfetch_noise_tex(coord) texelFetch(utilTex, ivec3(ivec2(coord) % LUT_SIZE, 2.0), 0)
#endif /* UTIL_TEX */		#endif /* UTIL_TEX */
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return max((form_factor * form_factor + avg_dir_z) / (form_factor + 1.0), 0.0);		return max((form_factor * form_factor + avg_dir_z) / (form_factor + 1.0), 0.0);
#endif		#endif
}		}

/**		/**
* An extended version of the implementation from		* An extended version of the implementation from
* "How to solve a cubic equation, revisited"		* "How to solve a cubic equation, revisited"
* http://momentsingraphics.de/?p=105		* http://momentsingraphics.de/?p=105
**/		*/
vec3 solve_cubic(vec4 coefs)		vec3 solve_cubic(vec4 coefs)
{		{
/* Normalize the polynomial */		/* Normalize the polynomial */
coefs.xyz /= coefs.w;		coefs.xyz /= coefs.w;
/* Divide middle coefficients by three */		/* Divide middle coefficients by three */
coefs.yz /= 3.0;		coefs.yz /= 3.0;

float A = coefs.w;		float A = coefs.w;
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