playcanvas
Version:
PlayCanvas WebGL game engine
58 lines (56 loc) • 1.92 kB
JavaScript
var glsltaaResolvePS = `
uniform sampler2D sourceTexture;
uniform sampler2D historyTexture;
uniform mat4 matrix_viewProjectionPrevious;
uniform mat4 matrix_viewProjectionInverse;
uniform vec4 jitters;
uniform vec2 textureSize;
varying vec2 uv0;
vec2 reproject(vec2 uv, float depth) {
depth = depth * 2.0 - 1.0;
vec4 ndc = vec4(uv * 2.0 - 1.0, depth, 1.0);
ndc.xy -= jitters.xy;
vec4 worldPosition = matrix_viewProjectionInverse * ndc;
worldPosition /= worldPosition.w;
vec4 screenPrevious = matrix_viewProjectionPrevious * worldPosition;
return (screenPrevious.xy / screenPrevious.w) * 0.5 + 0.5;
}
vec4 colorClamp(vec2 uv, vec4 historyColor) {
vec3 minColor = vec3(9999.0);
vec3 maxColor = vec3(-9999.0);
for(float x = -1.0; x <= 1.0; ++x) {
for(float y = -1.0; y <= 1.0; ++y) {
vec3 color = texture2D(sourceTexture, uv + vec2(x, y) / textureSize).rgb;
minColor = min(minColor, color);
maxColor = max(maxColor, color);
}
}
vec3 clamped = clamp(historyColor.rgb, minColor, maxColor);
return vec4(clamped, historyColor.a);
}
void main()
{
vec2 uv = uv0;
uv.y = 1.0 - uv.y;
vec4 srcColor = texture2D(sourceTexture, uv);
float linearDepth = getLinearScreenDepth(uv0);
float depth = delinearizeDepth(linearDepth);
vec2 historyUv = reproject(uv0, depth);
vec4 historyColor = SampleTextureCatmullRom(TEXTURE_PASS(historyTexture), historyUv, textureSize);
vec4 historyColor = texture2D(historyTexture, historyUv);
vec4 historyColorClamped = colorClamp(uv, historyColor);
float mixFactor = (historyUv.x < 0.0 || historyUv.x > 1.0 || historyUv.y < 0.0 || historyUv.y > 1.0) ?
1.0 : 0.05;
gl_FragColor = mix(historyColorClamped, srcColor, mixFactor);
}
`;
export { glsltaaResolvePS as default };