playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatSogsData.d.ts

PlayCanvas WebGL game engine

declare const _default: "\n#include \"gsplatPackingPS\"\n\nuniform highp usampler2D packedTexture;\n\nuniform vec3 means_mins;\nuniform vec3 means_maxs;\n\nuniform float scales_mins;\nuniform float scales_maxs;\n\nuvec4 packedSample;\n\n// read the model-space center of the gaussian\nvec3 readCenter(SplatSource source) {\n\n    // read the packed texture sample\n    packedSample = texelFetch(packedTexture, source.uv, 0);\n\n    vec3 l = unpack8888(packedSample.x).xyz;\n    vec3 u = unpack8888(packedSample.y).xyz;\n    vec3 n = (l + u * 256.0) / 257.0;\n    vec3 v = mix(means_mins, means_maxs, n);\n\n    return sign(v) * (exp(abs(v)) - 1.0);\n}\n\nconst float norm = sqrt(2.0);\n\n// sample covariance vectors\nvoid readCovariance(in SplatSource source, out vec3 covA, out vec3 covB) {\n    // decode rotation quaternion\n    vec3 qdata = unpack8888(packedSample.z).xyz;\n    vec3 sdata = unpack101010(packedSample.w >> 2u);\n\n    uint qmode = packedSample.w & 0x3u;\n    vec3 abc = (qdata - 0.5) * norm;\n    float d = sqrt(max(0.0, 1.0 - dot(abc, abc)));\n\n    vec4 quat = (qmode == 0u) ? vec4(d, abc) :\n                ((qmode == 1u) ? vec4(abc.x, d, abc.yz) :\n                ((qmode == 2u) ? vec4(abc.xy, d, abc.z) : vec4(abc, d)));\n\n    mat3 rot = quatToMat3(quat);\n    vec3 scale = exp(mix(vec3(scales_mins), vec3(scales_maxs), sdata));\n\n    // M = S * R\n    mat3 M = transpose(mat3(\n        scale.x * rot[0],\n        scale.y * rot[1],\n        scale.z * rot[2]\n    ));\n\n    covA = vec3(dot(M[0], M[0]), dot(M[0], M[1]), dot(M[0], M[2]));\n    covB = vec3(dot(M[1], M[1]), dot(M[1], M[2]), dot(M[2], M[2]));\n}\n";
export default _default;