43 lines
1.8 KiB
GLSL
Executable file
43 lines
1.8 KiB
GLSL
Executable file
#include "../compiled.glsl"
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uniform sampler2D shadowMap;
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float texture2DCompare(const vec2 uv, const float compare){
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float depth = texture(shadowMap, uv).r;
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return step(compare, depth);
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}
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float texture2DShadowLerp(const vec2 uv, const float compare){
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const vec2 texelSize = vec2(1.0) / shadowmapSize;
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vec2 f = fract(uv * shadowmapSize + 0.5);
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vec2 centroidUV = floor(uv * shadowmapSize + 0.5) / shadowmapSize;
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float lb = texture2DCompare(centroidUV, compare);
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float lt = texture2DCompare(centroidUV + texelSize * vec2(0.0, 1.0), compare);
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float rb = texture2DCompare(centroidUV + texelSize * vec2(1.0, 0.0), compare);
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float rt = texture2DCompare(centroidUV + texelSize, compare);
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float a = mix(lb, lt, f.y);
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float b = mix(rb, rt, f.y);
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float c = mix(a, b, f.x);
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return c;
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}
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float PCF(const vec2 uv, float compare) {
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// float result = 0.0;
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// for (int x = -1; x <= 1; x++){
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// for(int y = -1; y <= 1; y++){
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// vec2 off = vec2(x, y) / shadowmapSize;
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// result += texture2DShadowLerp(shadowmapSize, uv + off, compare);
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float result = texture2DShadowLerp(uv + (vec2(-1.0, -1.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(-1.0, 0.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(-1.0, 1.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(0.0, -1.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv, compare);
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result += texture2DShadowLerp(uv + (vec2(0.0, 1.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(1.0, -1.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(1.0, 0.0) / shadowmapSize), compare);
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result += texture2DShadowLerp(uv + (vec2(1.0, 1.0) / shadowmapSize), compare);
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// }
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// }
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return result / 9.0;
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}
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