44 lines
1.3 KiB
GLSL
44 lines
1.3 KiB
GLSL
#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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#ifdef _InvY
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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 gbuffer0, mat4 invVP, vec3 eye) {
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vec2 texCoord = getProjectedCoord(hitCoord);
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// #ifdef _InvY // D3D
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// float depth = texture(gbufferD, texCoord).r * 2.0 - 1.0;
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// #else
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// TODO: store_depth
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vec4 g0 = texture(gbuffer0, texCoord);
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float depth = (1.0 - g0.a) * 2.0 - 1.0;
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// #endif
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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 traceShadow(vec3 dir, vec3 hitCoord, sampler2D gbuffer0, mat4 invVP, vec3 eye) {
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dir *= ssrsRayStep;
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// for (int i = 0; i < maxSteps; i++) {
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hitCoord += dir;
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if (getDeltaDepth(hitCoord, gbuffer0, invVP, eye) > 0.0) return 0.6;
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hitCoord += dir;
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if (getDeltaDepth(hitCoord, gbuffer0, invVP, eye) > 0.0) return 0.7;
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hitCoord += dir;
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if (getDeltaDepth(hitCoord, gbuffer0, invVP, eye) > 0.0) return 0.8;
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hitCoord += dir;
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if (getDeltaDepth(hitCoord, gbuffer0, invVP, eye) > 0.0) return 0.9;
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//}
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return 1.0;
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}
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