playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/render-pass/frag/taaResolve.d.ts

PlayCanvas WebGL game engine

declare const _default: "\n    #include  \"sampleCatmullRomPS\"\n    #include  \"screenDepthPS\"\n\n    uniform sampler2D sourceTexture;\n    uniform sampler2D historyTexture;\n    uniform mat4 matrix_viewProjectionPrevious;\n    uniform mat4 matrix_viewProjectionInverse;\n    uniform vec4 jitters;   // xy: current frame, zw: previous frame\n    uniform vec2 textureSize;\n\n    varying vec2 uv0;\n\n    vec2 reproject(vec2 uv, float depth) {\n\n        // fragment NDC\n        #ifndef WEBGPU\n            depth = depth * 2.0 - 1.0;\n        #endif\n        vec4 ndc = vec4(uv * 2.0 - 1.0, depth, 1.0);\n\n        // remove jitter from the current frame\n        ndc.xy -= jitters.xy;\n\n        // Transform NDC to world space of the current frame\n        vec4 worldPosition = matrix_viewProjectionInverse * ndc;\n        worldPosition /= worldPosition.w;\n\n        // world position to screen space of the previous frame\n        vec4 screenPrevious = matrix_viewProjectionPrevious * worldPosition;\n\n        return (screenPrevious.xy / screenPrevious.w) * 0.5 + 0.5;\n    }\n\n    vec4 colorClamp(vec2 uv, vec4 historyColor) {\n\n        // out of range numbers\n        vec3 minColor = vec3(9999.0);\n        vec3 maxColor = vec3(-9999.0);\n\n        // sample a 3x3 neighborhood to create a box in color space\n        for(float x = -1.0; x <= 1.0; ++x) {\n            for(float y = -1.0; y <= 1.0; ++y) {\n                vec3 color = texture2D(sourceTexture, uv + vec2(x, y) / textureSize).rgb;\n                minColor = min(minColor, color);\n                maxColor = max(maxColor, color);\n            }\n        }\n\n        // clamp the history color to min/max bounding box\n        vec3 clamped = clamp(historyColor.rgb, minColor, maxColor);\n        return vec4(clamped, historyColor.a);\n    }\n\n    void main()\n    {\n        vec2 uv = uv0;\n\n        #ifdef WEBGPU\n            // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n            // This hack is needed on webgpu, which makes TAA work but the resulting image is upside-down.\n            // We could flip the image in the following pass, but ideally a better solution should be found.\n            uv.y = 1.0 - uv.y;\n            // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n        #endif\n\n        // current frame\n        vec4 srcColor = texture2D(sourceTexture, uv);\n\n        // current depth is in linear space, convert it to non-linear space\n        float linearDepth = getLinearScreenDepth(uv0);\n        float depth = delinearizeDepth(linearDepth);\n\n        // previous frame\n        vec2 historyUv = reproject(uv0, depth);\n\n        #ifdef QUALITY_HIGH\n\n            // high quality history, sharper result\n            vec4 historyColor = SampleTextureCatmullRom(TEXTURE_PASS(historyTexture), historyUv, textureSize);\n\n        #else\n\n            // single sample history, more blurry result\n            vec4 historyColor = texture2D(historyTexture, historyUv);\n\n        #endif\n\n        // handle disocclusion by clamping the history color\n        vec4 historyColorClamped = colorClamp(uv, historyColor);\n\n        // handle history buffer outside of the frame\n        float mixFactor = (historyUv.x < 0.0 || historyUv.x > 1.0 || historyUv.y < 0.0 || historyUv.y > 1.0) ?\n            1.0 : 0.05;\n\n        gl_FragColor = mix(historyColorClamped, srcColor, mixFactor);\n    }\n";
export default _default;