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playcanvas

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PlayCanvas WebGL game engine

playcanvas.com

playcanvas/engine

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declare const _default: "\nvar means_u: texture_2d<f32>;\nvar means_l: texture_2d<f32>;\nvar quats: texture_2d<f32>;\nvar scales: texture_2d<f32>;\n\nuniform means_mins: vec3f;\nuniform means_maxs: vec3f;\n\nuniform scales_mins: vec3f;\nuniform scales_maxs: vec3f;\n\n// read the model-space center of the gaussian\nfn readCenter(source: ptr<function, SplatSource>) -> vec3f {\n let u: vec3f = textureLoad(means_u, source.uv, 0).xyz;\n let l: vec3f = textureLoad(means_l, source.uv, 0).xyz;\n let n: vec3f = (l * 255.0 + u * 255.0 * 256.0) / 65535.0;\n\n let v: vec3f = mix(uniform.means_mins, uniform.means_maxs, n);\n return sign(v) * (exp(abs(v)) - 1.0);\n}\n\nconst norm: f32 = 2.0 / sqrt(2.0);\n\n// sample covariance vectors\nfn readCovariance(source: ptr<function, SplatSource>, covA_ptr: ptr<function, vec3f>, covB_ptr: ptr<function, vec3f>) {\n let qdata: vec4f = textureLoad(quats, source.uv, 0);\n let abc: vec3f = (qdata.xyz - 0.5) * norm;\n let d: f32 = sqrt(max(0.0, 1.0 - dot(abc, abc)));\n\n let mode: u32 = u32(qdata.w * 255.0 + 0.5) - 252u;\n\n var quat: vec4f;\n if (mode == 0u) {\n quat = vec4f(d, abc);\n } else if (mode == 1u) {\n quat = vec4f(abc.x, d, abc.y, abc.z);\n } else if (mode == 2u) {\n quat = vec4f(abc.x, abc.y, d, abc.z);\n } else {\n quat = vec4f(abc.x, abc.y, abc.z, d);\n }\n\n\n let rot: mat3x3f = quatToMat3(quat);\n let scale: vec3f = exp(mix(uniform.scales_mins, uniform.scales_maxs, textureLoad(scales, source.uv, 0).xyz));\n\n // M = S * R\n let M: mat3x3f = transpose(mat3x3f(\n scale.x * rot[0],\n scale.y * rot[1],\n scale.z * rot[2]\n ));\n\n *covA_ptr = vec3f(dot(M[0], M[0]), dot(M[0], M[1]), dot(M[0], M[2]));\n *covB_ptr = vec3f(dot(M[1], M[1]), dot(M[1], M[2]), dot(M[2], M[2]));\n}\n"; export default _default;