playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/gsplat/vert/gsplatSH.js

PlayCanvas WebGL game engine

var gsplatSHVS = `
#if SH_BANDS > 0
vec3 unpack111011s(uint bits) {
	return vec3((uvec3(bits) >> uvec3(21u, 11u, 0u)) & uvec3(0x7ffu, 0x3ffu, 0x7ffu)) / vec3(2047.0, 1023.0, 2047.0) * 2.0 - 1.0;
}
void fetchScale(in uvec4 t, out float scale, out vec3 a, out vec3 b, out vec3 c) {
	scale = uintBitsToFloat(t.x);
	a = unpack111011s(t.y);
	b = unpack111011s(t.z);
	c = unpack111011s(t.w);
}
void fetch(in uvec4 t, out vec3 a, out vec3 b, out vec3 c, out vec3 d) {
	a = unpack111011s(t.x);
	b = unpack111011s(t.y);
	c = unpack111011s(t.z);
	d = unpack111011s(t.w);
}
void fetch(in uint t, out vec3 a) {
	a = unpack111011s(t);
}
#if SH_BANDS == 1
	uniform highp usampler2D splatSH_1to3;
	void readSHData(in SplatSource source, out vec3 sh[3], out float scale) {
		fetchScale(texelFetch(splatSH_1to3, source.uv, 0), scale, sh[0], sh[1], sh[2]);
	}
#elif SH_BANDS == 2
	uniform highp usampler2D splatSH_1to3;
	uniform highp usampler2D splatSH_4to7;
	uniform highp usampler2D splatSH_8to11;
	void readSHData(in SplatSource source, out vec3 sh[8], out float scale) {
		fetchScale(texelFetch(splatSH_1to3, source.uv, 0), scale, sh[0], sh[1], sh[2]);
		fetch(texelFetch(splatSH_4to7, source.uv, 0), sh[3], sh[4], sh[5], sh[6]);
		fetch(texelFetch(splatSH_8to11, source.uv, 0).x, sh[7]);
	}
#else
	uniform highp usampler2D splatSH_1to3;
	uniform highp usampler2D splatSH_4to7;
	uniform highp usampler2D splatSH_8to11;
	uniform highp usampler2D splatSH_12to15;
	void readSHData(in SplatSource source, out vec3 sh[15], out float scale) {
		fetchScale(texelFetch(splatSH_1to3, source.uv, 0), scale, sh[0], sh[1], sh[2]);
		fetch(texelFetch(splatSH_4to7, source.uv, 0), sh[3], sh[4], sh[5], sh[6]);
		fetch(texelFetch(splatSH_8to11, source.uv, 0), sh[7], sh[8], sh[9], sh[10]);
		fetch(texelFetch(splatSH_12to15, source.uv, 0), sh[11], sh[12], sh[13], sh[14]);
	}
#endif
#endif
`;

export { gsplatSHVS as default };