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

Open-source WebGL/WebGPU 3D engine for the web

declare const _default: "\nuniform sampler2D sourceTexture;\nuniform vec2 sourceInvResolution;\nvarying vec2 uv0;\n\n#ifdef PREMULTIPLY\n    uniform sampler2D premultiplyTexture;\n#endif\n\nvoid main()\n{\n    vec3 e = texture2D (sourceTexture, uv0).rgb;\n\n    #ifdef BOXFILTER\n        vec3 value = e;\n\n        #ifdef PREMULTIPLY\n            float premultiply = texture2D(premultiplyTexture, uv0).{PREMULTIPLY_SRC_CHANNEL};\n            value *= vec3(premultiply);\n        #endif\n    #else\n\n        float x = sourceInvResolution.x;\n        float y = sourceInvResolution.y;\n\n        vec3 a = texture2D(sourceTexture, vec2 (uv0.x - 2.0 * x, uv0.y + 2.0 * y)).rgb;\n        vec3 b = texture2D(sourceTexture, vec2 (uv0.x,           uv0.y + 2.0 * y)).rgb;\n        vec3 c = texture2D(sourceTexture, vec2 (uv0.x + 2.0 * x, uv0.y + 2.0 * y)).rgb;\n\n        vec3 d = texture2D(sourceTexture, vec2 (uv0.x - 2.0 * x, uv0.y)).rgb;\n        vec3 f = texture2D(sourceTexture, vec2 (uv0.x + 2.0 * x, uv0.y)).rgb;\n\n        vec3 g = texture2D(sourceTexture, vec2 (uv0.x - 2.0 * x, uv0.y - 2.0 * y)).rgb;\n        vec3 h = texture2D(sourceTexture, vec2 (uv0.x,           uv0.y - 2.0 * y)).rgb;\n        vec3 i = texture2D(sourceTexture, vec2 (uv0.x + 2.0 * x, uv0.y - 2.0 * y)).rgb;\n\n        vec3 j = texture2D(sourceTexture, vec2 (uv0.x - x, uv0.y + y)).rgb;\n        vec3 k = texture2D(sourceTexture, vec2 (uv0.x + x, uv0.y + y)).rgb;\n        vec3 l = texture2D(sourceTexture, vec2 (uv0.x - x, uv0.y - y)).rgb;\n        vec3 m = texture2D(sourceTexture, vec2 (uv0.x + x, uv0.y - y)).rgb;\n\n\n        vec3 value = e * 0.125;\n        value += (a + c + g + i) * 0.03125;\n        value += (b + d + f + h) * 0.0625;\n        value += (j + k + l + m) * 0.125;\n    #endif\n\n    #ifdef REMOVE_INVALID\n        value = max(value, vec3(0.0));\n    #endif\n\n    gl_FragColor = vec4(value, 1.0);\n}\n";
export default _default;