65 lines
1.9 KiB
Plaintext
65 lines
1.9 KiB
Plaintext
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// Alchemy AO / Scalable Ambient Obscurance
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#version 450
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#include "compiled.inc"
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#include "std/gbuffer.glsl"
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uniform sampler2D gbufferD;
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uniform sampler2D gbuffer0;
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uniform vec2 cameraProj;
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uniform vec3 eye;
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uniform vec3 eyeLook;
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uniform vec2 screenSize;
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uniform mat4 invVP;
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#ifdef _CPostprocess
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uniform vec3 PPComp12;
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#endif
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in vec2 texCoord;
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in vec3 viewRay;
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out float fragColor;
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void main() {
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float depth = textureLod(gbufferD, texCoord, 0.0).r * 2.0 - 1.0;
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if (depth == 1.0) { fragColor = 1.0; return; }
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vec2 enc = textureLod(gbuffer0, texCoord, 0.0).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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vec3 vray = normalize(viewRay);
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vec3 currentPos = getPosNoEye(eyeLook, vray, depth, cameraProj);
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// vec3 currentPos = getPos2NoEye(eye, invVP, depth, texCoord);
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float currentDistance = length(currentPos);
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#ifdef _CPostprocess
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float currentDistanceA = currentDistance * PPComp12.z * (1.0 / PPComp12.y);
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#else
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float currentDistanceA = currentDistance * ssaoScale * (1.0 / ssaoRadius);
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#endif
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float currentDistanceB = currentDistance * 0.0005;
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ivec2 px = ivec2(texCoord * screenSize);
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float phi = (3 * px.x ^ px.y + px.x * px.y) * 10;
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fragColor = 0;
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const int samples = 8;
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const float samplesInv = PI2 * (1.0 / samples);
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for (int i = 0; i < samples; ++i) {
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float theta = samplesInv * (i + 0.5) + phi;
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vec2 k = vec2(cos(theta), sin(theta)) / currentDistanceA;
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depth = textureLod(gbufferD, texCoord + k, 0.0).r * 2.0 - 1.0;
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// vec3 pos = getPosNoEye(eyeLook, vray, depth, cameraProj) - currentPos;
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vec3 pos = getPos2NoEye(eye, invVP, depth, texCoord + k) - currentPos;
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fragColor += max(0, dot(pos, n) - currentDistanceB) / (dot(pos, pos) + 0.015);
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}
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#ifdef _CPostprocess
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fragColor *= (PPComp12.x * 0.3) / samples;
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#else
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fragColor *= (ssaoStrength * 0.3) / samples;
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#endif
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fragColor = 1.0 - fragColor;
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}
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