37 lines
970 B
GLSL
37 lines
970 B
GLSL
#ifndef _SSRS_GLSL_
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#define _SSRS_GLSL_
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#include "std/gbuffer.glsl"
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uniform mat4 VP;
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vec2 getProjectedCoord(vec3 hitCoord) {
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vec4 projectedCoord = VP * vec4(hitCoord, 1.0);
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projectedCoord.xy /= projectedCoord.w;
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projectedCoord.xy = projectedCoord.xy * 0.5 + 0.5;
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#if defined(HLSL) || defined(METAL)
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projectedCoord.y = 1.0 - projectedCoord.y;
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#endif
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return projectedCoord.xy;
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}
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float getDeltaDepth(vec3 hitCoord, sampler2D gbufferD, mat4 invVP, vec3 eye) {
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vec2 texCoord = getProjectedCoord(hitCoord);
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float depth = textureLod(gbufferD, texCoord, 0.0).r * 2.0 - 1.0;
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vec3 wpos = getPos2(invVP, depth, texCoord);
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float d1 = length(eye - wpos);
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float d2 = length(eye - hitCoord);
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return d1 - d2;
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}
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float traceShadowSS(vec3 dir, vec3 hitCoord, sampler2D gbufferD, mat4 invVP, vec3 eye) {
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dir *= ssrsRayStep;
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for (int i = 0; i < 4; i++) {
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hitCoord += dir;
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if (getDeltaDepth(hitCoord, gbufferD, invVP, eye) > 0.0) return 1.0;
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}
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return 0.0;
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}
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#endif
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