pixi.js
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66 lines (64 loc) • 1.68 kB
JavaScript
;
const WGSL_TO_STD40_SIZE = {
f32: 4,
i32: 4,
"vec2<f32>": 8,
"vec3<f32>": 12,
"vec4<f32>": 16,
"vec2<i32>": 8,
"vec3<i32>": 12,
"vec4<i32>": 16,
"mat2x2<f32>": 16 * 2,
"mat3x3<f32>": 16 * 3,
"mat4x4<f32>": 16 * 4
// TODO - not essential for now but support these in the future
// int: 4,
// ivec2: 8,
// ivec3: 12,
// ivec4: 16,
// uint: 4,
// uvec2: 8,
// uvec3: 12,
// uvec4: 16,
// bool: 4,
// bvec2: 8,
// bvec3: 12,
// bvec4: 16,
// mat2: 16 * 2,
// mat3: 16 * 3,
// mat4: 16 * 4,
};
function createUboElementsSTD40(uniformData) {
const uboElements = uniformData.map((data) => ({
data,
offset: 0,
size: 0
}));
const chunkSize = 16;
let size = 0;
let offset = 0;
for (let i = 0; i < uboElements.length; i++) {
const uboElement = uboElements[i];
size = WGSL_TO_STD40_SIZE[uboElement.data.type];
if (!size) {
throw new Error(`Unknown type ${uboElement.data.type}`);
}
if (uboElement.data.size > 1) {
size = Math.max(size, chunkSize) * uboElement.data.size;
}
const boundary = size === 12 ? 16 : size;
uboElement.size = size;
const curOffset = offset % chunkSize;
if (curOffset > 0 && chunkSize - curOffset < boundary) {
offset += (chunkSize - curOffset) % 16;
} else {
offset += (size - curOffset % size) % size;
}
uboElement.offset = offset;
offset += size;
}
offset = Math.ceil(offset / 16) * 16;
return { uboElements, size: offset };
}
export { WGSL_TO_STD40_SIZE, createUboElementsSTD40 };
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