109 lines
2.9 KiB
GLSL
Executable file
109 lines
2.9 KiB
GLSL
Executable file
#version 450
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#include "compiled.inc"
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#include "std/math.glsl"
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#include "std/gbuffer.glsl"
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uniform sampler2D tex;
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uniform sampler2D gbufferD;
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uniform sampler2D gbuffer0; // Normal, roughness
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uniform sampler2D gbuffer1; // basecol, spec
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uniform mat4 P;
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uniform mat4 tiV;
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uniform vec2 cameraProj;
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in vec3 viewRay;
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in vec2 texCoord;
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out vec4 fragColor;
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vec3 hitCoord;
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float depth;
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const int numBinarySearchSteps = 7;
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const int maxSteps = 18;
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vec2 getProjectedCoord(const vec3 hit) {
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vec4 projectedCoord = P * vec4(hit, 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 HLSL
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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(const vec3 hit) {
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depth = textureLod(gbufferD, getProjectedCoord(hit), 0.0).r * 2.0 - 1.0;
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vec3 viewPos = getPosView(viewRay, depth, cameraProj);
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return viewPos.z - hit.z;
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}
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vec4 binarySearch(vec3 dir) {
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float ddepth;
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for (int i = 0; i < numBinarySearchSteps; i++) {
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dir *= 0.5;
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hitCoord -= dir;
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ddepth = getDeltaDepth(hitCoord);
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if (ddepth < 0.0) hitCoord += dir;
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}
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// Ugly discard of hits too far away
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if (abs(ddepth) > 0.01) return vec4(0.0);
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return vec4(getProjectedCoord(hitCoord), 0.0, 1.0);
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}
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vec4 rayCast(vec3 dir) {
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dir *= ssrRayStep;
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for (int i = 0; i < maxSteps; i++) {
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hitCoord += dir;
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if (getDeltaDepth(hitCoord) > 0.0) return binarySearch(dir);
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}
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return vec4(0.0);
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}
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void main() {
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vec4 g0 = textureLod(gbuffer0, texCoord, 0.0);
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float roughness = unpackFloat(g0.b).y;
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if (roughness == 1.0) { fragColor.rgb = vec3(0.0); return; }
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float spec = fract(textureLod(gbuffer1, texCoord, 0.0).a);
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if (spec == 0.0) { fragColor.rgb = vec3(0.0); return; }
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float d = textureLod(gbufferD, texCoord, 0.0).r * 2.0 - 1.0;
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if (d == 1.0) { fragColor.rgb = vec3(0.0); return; }
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vec2 enc = g0.rg;
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vec3 n;
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n.z = 1.0 - abs(enc.x) - abs(enc.y);
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n.xy = n.z >= 0.0 ? enc.xy : octahedronWrap(enc.xy);
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n = normalize(n);
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#ifdef _SSRZOnly
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if (n.z <= 0.9) { fragColor.rgb = vec3(0.0); return; }
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#endif
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vec4 viewNormal = tiV * vec4(n, 1.0);
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vec3 viewPos = getPosView(viewRay, d, cameraProj);
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vec3 reflected = normalize(reflect(viewPos, viewNormal.xyz));
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hitCoord = viewPos.xyz;
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vec3 dir = reflected * max(ssrMinRayStep, -viewPos.z) * (1.0 - rand(texCoord) * ssrJitter * roughness);
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vec4 coords = rayCast(dir);
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vec2 deltaCoords = abs(vec2(0.5, 0.5) - coords.xy);
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float screenEdgeFactor = clamp(1.0 - (deltaCoords.x + deltaCoords.y), 0.0, 1.0);
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float reflectivity = 1.0 - roughness;
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float intensity = pow(reflectivity, ssrFalloffExp) *
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screenEdgeFactor *
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clamp(-reflected.z, 0.0, 1.0) *
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clamp((ssrSearchDist - length(viewPos.xyz - hitCoord)) *
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(1.0 / ssrSearchDist), 0.0, 1.0) *
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coords.w;
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intensity = clamp(intensity, 0.0, 1.0);
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vec3 reflCol = textureLod(tex, coords.xy, 0.0).rgb;
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reflCol = clamp(reflCol, 0.0, 1.0);
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fragColor.rgb = reflCol * intensity * 0.5;
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}
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