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

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

	/**			/**
	* Shader that down-sample depth buffer,			* Shader that down-sample depth buffer,
	* saving min and max value of each texel in the above mipmaps.			* saving min and max value of each texel in the above mipmaps.
	* Adapted from http://rastergrid.com/blog/2010/10/hierarchical-z-map-based-occlusion-culling/			* Adapted from http://rastergrid.com/blog/2010/10/hierarchical-z-map-based-occlusion-culling/
	*			*
	* Major simplification has been made since we pad the buffer to always be bigger than input to			* Major simplification has been made since we pad the buffer to always be bigger than input to
	* avoid mipmapping misalignment.			* avoid mipmapping misalignment.
	*/			*/

	#ifdef LAYERED			#ifdef LAYERED
	uniform sampler2DArray depthBuffer;
	uniform int depthLayer;
	#else
	uniform sampler2D depthBuffer;
	#endif

	#ifndef COPY_DEPTH
	uniform vec2 texelSize;
	#endif

	#ifdef LAYERED
	# define sampleLowerMip(t) texture(depthBuffer, vec3(t, depthLayer)).r			# define sampleLowerMip(t) texture(depthBuffer, vec3(t, depthLayer)).r
	# define gatherLowerMip(t) textureGather(depthBuffer, vec3(t, depthLayer))			# define gatherLowerMip(t) textureGather(depthBuffer, vec3(t, depthLayer))
	#else			#else
	# define sampleLowerMip(t) texture(depthBuffer, t).r			# define sampleLowerMip(t) texture(depthBuffer, t).r
	# define gatherLowerMip(t) textureGather(depthBuffer, t)			# define gatherLowerMip(t) textureGather(depthBuffer, t)
	#endif			#endif

	#ifdef MIN_PASS			#ifdef MIN_PASS
	# define minmax2(a, b) min(a, b)			# define minmax2(a, b) min(a, b)
	# define minmax3(a, b, c) min(min(a, b), c)			# define minmax3(a, b, c) min(min(a, b), c)
	# define minmax4(a, b, c, d) min(min(min(a, b), c), d)			# define minmax4(a, b, c, d) min(min(min(a, b), c), d)
	#else /* MAX_PASS */			#else /* MAX_PASS */
	# define minmax2(a, b) max(a, b)			# define minmax2(a, b) max(a, b)
	# define minmax3(a, b, c) max(max(a, b), c)			# define minmax3(a, b, c) max(max(a, b), c)
	# define minmax4(a, b, c, d) max(max(max(a, b), c), d)			# define minmax4(a, b, c, d) max(max(max(a, b), c), d)
	#endif			#endif

	/* On some AMD card / driver combination, it is needed otherwise,
	* the shader does not write anything. */
	#if (defined(GPU_INTEL) \|\| defined(GPU_ATI)) && defined(GPU_OPENGL)
	out vec4 fragColor;
	#endif

	void main()			void main()
	{			{
	vec2 texel = gl_FragCoord.xy;			vec2 texel = gl_FragCoord.xy;

	#ifdef COPY_DEPTH			#ifdef COPY_DEPTH
	vec2 uv = texel / vec2(textureSize(depthBuffer, 0).xy);			vec2 uv = texel / vec2(textureSize(depthBuffer, 0).xy);

	float val = sampleLowerMip(uv);			float val = sampleLowerMip(uv);
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