playcanvas/build/playcanvas/src/scene/shader-lib/wgsl/chunks/gsplat/vert/gsplatQuatToMat3.js

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

var gsplatQuatToMat3VS = `
fn quatToMat3(r: half4) -> half3x3 {
	let r2: half4 = r + r;
	let x: half   = r2.x * r.w;
	let y: half4  = r2.y * r;
	let z: half4  = r2.z * r;
	let w: half   = r2.w * r.w;
	return half3x3(
		half(1.0) - z.z - w,  y.z + x,			  y.w - z.x,
		y.z - x,			  half(1.0) - y.y - w,   z.w + y.x,
		y.w + z.x,			z.w - y.x,			 half(1.0) - y.y - z.z
	);
}
fn quatMul(a: half4, b: half4) -> half4 {
	return half4(
		a.w * b.x + a.x * b.w + a.y * b.z - a.z * b.y,
		a.w * b.y - a.x * b.z + a.y * b.w + a.z * b.x,
		a.w * b.z + a.x * b.y - a.y * b.x + a.z * b.w,
		a.w * b.w - a.x * b.x - a.y * b.y - a.z * b.z
	);
}
`;

export { gsplatQuatToMat3VS as default };