172 lines
7 KiB
GLSL
172 lines
7 KiB
GLSL
// Alchemy AO
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// Compute kernel
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// var kernel:Array<Float> = [];
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// var kernelSize = 8;
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// for (i in 0...kernelSize) {
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// var angle = i / kernelSize;
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// angle *= 3.1415926535 * 2.0;
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// var x1 = Math.cos(angle);
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// var y1 = Math.sin(angle);
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// x1 = Std.int(x1 * 10000000) / 10000000;
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// y1 = Std.int(y1 * 10000000) / 10000000;
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// trace(x1, y1);
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// }
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#version 450
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#ifdef GL_ES
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precision mediump float;
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#endif
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#include "../compiled.glsl"
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uniform sampler2D gbufferD;
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uniform sampler2D gbuffer0;
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uniform sampler2D sveloc;
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uniform sampler2D slast;
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uniform sampler2D snoise;
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uniform mat4 invVP;
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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 vec2 aspectRatio;
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#ifndef _SSAO // SSAO disabled, remove it from render path nodes to completely prevent generation
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const float ssaoSize = 0.03;
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const float ssaoStrength = 0.20;
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#endif
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in vec2 texCoord;
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in vec3 viewRay;
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out vec4 fragColor;
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// float rand(vec2 co) { // Unreliable
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// return fract(sin(dot(co.xy ,vec2(12.9898, 78.233))) * 43758.5453);
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// }
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vec2 octahedronWrap(vec2 v) {
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return (1.0 - abs(v.yx)) * (vec2(v.x >= 0.0 ? 1.0 : -1.0, v.y >= 0.0 ? 1.0 : -1.0));
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}
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// vec3 getPos(float depth, vec2 coord) {
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// vec4 pos = vec4(coord * 2.0 - 1.0, depth, 1.0);
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// pos = invVP * pos;
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// pos.xyz /= pos.w;
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// return pos.xyz - eye;
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// }
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vec3 getPos(float depth) {
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vec3 vray = normalize(viewRay);
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const float projectionA = cameraPlane.y / (cameraPlane.y - cameraPlane.x);
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const float projectionB = -(cameraPlane.y * cameraPlane.x) / (cameraPlane.y - cameraPlane.x);
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float linearDepth = projectionB / (depth * 0.5 + 0.5 - projectionA);
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float viewZDist = dot(eyeLook, vray);
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// vec3 wposition = eye + vray * (linearDepth / viewZDist);
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vec3 wposition = vray * (linearDepth / viewZDist);
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return wposition;
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}
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float doAO(vec2 kernelVec, vec2 randomVec, mat2 rotMat, vec3 currentPos, vec3 currentNormal, float currentDistance) {
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kernelVec.xy *= aspectRatio;
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float radius = ssaoSize * randomVec.y;
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kernelVec.xy = ((rotMat * kernelVec.xy) / currentDistance) * radius;
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vec2 coord = texCoord + kernelVec.xy;
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float depth = texture(gbufferD, coord).r * 2.0 - 1.0;
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vec3 pos = getPos(depth) - currentPos;
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float angle = dot(pos, currentNormal);
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// angle *= step(0.3, angle / length(pos)); // Fix intersect
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angle *= step(0.1, angle / length(pos));
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angle -= currentDistance * 0.001;
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angle = max(0.0, angle);
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// angle /= dot(pos, pos) / min(currentDistance * 0.25, 1.0) + 0.00001; // Fix darkening
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angle /= dot(pos, pos) / min(currentDistance * 0.25, 1.0) + 0.001;
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return angle;
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}
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void main() {
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float depth = texture(gbufferD, texCoord).r * 2.0 - 1.0;
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if (depth == 1.0) {
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fragColor = vec4(1.0);
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return;
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}
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const int kernelSize = 12;
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const vec2 kernel0 = vec2(1.0, 0.0);
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const vec2 kernel1 = vec2(0.8660254, 0.4999999);
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const vec2 kernel2 = vec2(0.5, 0.8660254);
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const vec2 kernel3 = vec2(0.0, 1.0);
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const vec2 kernel4 = vec2(-0.4999999, 0.8660254);
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const vec2 kernel5 = vec2(-0.8660254, 0.5);
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const vec2 kernel6 = vec2(-1.0, 0.0);
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const vec2 kernel7 = vec2(-0.8660254, -0.4999999);
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const vec2 kernel8 = vec2(-0.5, -0.8660254);
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const vec2 kernel9 = vec2(0.0, -1.0);
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const vec2 kernel10 = vec2(0.4999999, -0.8660254);
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const vec2 kernel11 = vec2(0.8660254, -0.5);
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// const vec2 kernel0 = vec2(1.0,0.0);
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// const vec2 kernel1 = vec2(0.9510565,0.3090169);
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// const vec2 kernel2 = vec2(0.8090169,0.5877852);
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// const vec2 kernel3 = vec2(0.5877852,0.8090169);
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// const vec2 kernel4 = vec2(0.3090169,0.9510565);
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// const vec2 kernel5 = vec2(0.0,1.0);
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// const vec2 kernel6 = vec2(-0.3090169,0.9510565);
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// const vec2 kernel7 = vec2(-0.5877852,0.8090169);
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// const vec2 kernel8 = vec2(-0.8090169,0.5877852);
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// const vec2 kernel9 = vec2(-0.9510565,0.3090169);
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// const vec2 kernel10 = vec2(-1,0);
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// const vec2 kernel11 = vec2(-0.9510565,-0.3090169);
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// const vec2 kernel12 = vec2(-0.8090169,-0.5877852);
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// const vec2 kernel13 = vec2(-0.5877852,-0.8090169);
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// const vec2 kernel14 = vec2(-0.3090169,-0.9510565);
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// const vec2 kernel15 = vec2(0.0,-1.0);
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// const vec2 kernel16 = vec2(0.3090169,-0.9510565);
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// const vec2 kernel17 = vec2(0.5877852,-0.8090169);
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// const vec2 kernel18 = vec2(0.8090169,-0.5877852);
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// const vec2 kernel19 = vec2(0.9510565,-0.3090169);
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vec2 enc = texture(gbuffer0, texCoord).rg;
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vec3 currentNormal;
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currentNormal.z = 1.0 - abs(enc.x) - abs(enc.y);
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currentNormal.xy = currentNormal.z >= 0.0 ? enc.xy : octahedronWrap(enc.xy);
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currentNormal = normalize(currentNormal);
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vec3 currentPos = getPos(depth);
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float currentDistance = length(currentPos);
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vec2 randomVec = texture(snoise, (texCoord * screenSize) / 8.0).xy;
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randomVec = randomVec * 2.0 - 1.0;
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mat2 rotMat = mat2(vec2(cos(randomVec.x * PI), -sin(randomVec.x * PI)),
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vec2(sin(randomVec.x * PI), cos(randomVec.x * PI)));
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// for (int i = 0; i < kernelSize; i++) {
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float amount = doAO(kernel0, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel1, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel2, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel3, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel4, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel5, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel6, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel7, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel8, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel9, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel10, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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amount += doAO(kernel11, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel12, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel13, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel14, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel15, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel16, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel17, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel18, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// amount += doAO(kernel19, randomVec, rotMat, currentPos, currentNormal, currentDistance);
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// }
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amount *= ssaoStrength / kernelSize;
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amount = 1.0 - amount;
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amount = max(0.0, amount);
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// fragColor = vec4(amount, 0.0, 0.0, 1.0);
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// Velocity is assumed to be calculated for motion blur, so we need to inverse it for reprojection
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vec2 velocity = -textureLod(sveloc, texCoord, 0.0).rg;
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float last = texture(slast, texCoord + velocity).r;
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fragColor = vec4((amount + last) * 0.5, 0.0, 0.0, 1.0);
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}
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