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More std140 tweaks

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Rezmason
2021-10-29 08:57:23 -07:00
parent d4b21a0e4c
commit f9b80224fe
2 changed files with 40 additions and 37 deletions
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3
TODO.txt
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@@ -1,7 +1,10 @@
TODO: TODO:
WebGPU WebGPU
First decent rainRender
vertex, fragment, with noise for
std140 std140
Document and share it
Write an explanation of the rain pass (and include images) Write an explanation of the rain pass (and include images)

74
js/std140.js
View File

@@ -1,62 +1,62 @@
const supportedLayoutTypes = { const supportedTypes = {
["i32"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "i32" }, ["i32"]: [1, 1, "i32"],
["u32"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "u32" }, ["u32"]: [1, 1, "u32"],
["f32"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "f32" }, ["f32"]: [1, 1, "f32"],
["atomic<i32>"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "i32" }, ["atomic<i32>"]: [1, 1, "i32"],
["vec2<i32>"]: { alignAtByte: 2, sizeInBytes: 2, baseType: "i32" }, ["vec2<i32>"]: [2, 2, "i32"],
["vec3<i32>"]: { alignAtByte: 4, sizeInBytes: 3, baseType: "i32" }, ["vec3<i32>"]: [4, 3, "i32"],
["vec4<i32>"]: { alignAtByte: 4, sizeInBytes: 4, baseType: "i32" }, ["vec4<i32>"]: [4, 4, "i32"],
["atomic<u32>"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "u32" }, ["atomic<u32>"]: [1, 1, "u32"],
["vec2<u32>"]: { alignAtByte: 2, sizeInBytes: 2, baseType: "u32" }, ["vec2<u32>"]: [2, 2, "u32"],
["vec3<u32>"]: { alignAtByte: 4, sizeInBytes: 3, baseType: "u32" }, ["vec3<u32>"]: [4, 3, "u32"],
["vec4<u32>"]: { alignAtByte: 4, sizeInBytes: 4, baseType: "u32" }, ["vec4<u32>"]: [4, 4, "u32"],
["atomic<f32>"]: { alignAtByte: 1, sizeInBytes: 1, baseType: "f32" }, ["atomic<f32>"]: [1, 1, "f32"],
["vec2<f32>"]: { alignAtByte: 2, sizeInBytes: 2, baseType: "f32" }, ["vec2<f32>"]: [2, 2, "f32"],
["vec3<f32>"]: { alignAtByte: 4, sizeInBytes: 3, baseType: "f32" }, ["vec3<f32>"]: [4, 3, "f32"],
["vec4<f32>"]: { alignAtByte: 4, sizeInBytes: 4, baseType: "f32" }, ["vec4<f32>"]: [4, 4, "f32"],
["mat2x2<f32>"]: { alignAtByte: 2, sizeInBytes: 4, baseType: "f32" }, ["mat2x2<f32>"]: [2, 4, "f32"],
["mat3x2<f32>"]: { alignAtByte: 2, sizeInBytes: 6, baseType: "f32" }, ["mat3x2<f32>"]: [2, 6, "f32"],
["mat4x2<f32>"]: { alignAtByte: 2, sizeInBytes: 8, baseType: "f32" }, ["mat4x2<f32>"]: [2, 8, "f32"],
["mat2x3<f32>"]: { alignAtByte: 4, sizeInBytes: 8, baseType: "f32" }, ["mat2x3<f32>"]: [4, 8, "f32"],
["mat3x3<f32>"]: { alignAtByte: 4, sizeInBytes: 12, baseType: "f32" }, ["mat3x3<f32>"]: [4, 12, "f32"],
["mat4x3<f32>"]: { alignAtByte: 4, sizeInBytes: 16, baseType: "f32" }, ["mat4x3<f32>"]: [4, 16, "f32"],
["mat2x4<f32>"]: { alignAtByte: 4, sizeInBytes: 8, baseType: "f32" }, ["mat2x4<f32>"]: [4, 8, "f32"],
["mat3x4<f32>"]: { alignAtByte: 4, sizeInBytes: 12, baseType: "f32" }, ["mat3x4<f32>"]: [4, 12, "f32"],
["mat4x4<f32>"]: { alignAtByte: 4, sizeInBytes: 16, baseType: "f32" }, ["mat4x4<f32>"]: [4, 16, "f32"],
}; };
const computeStructLayout = (types) => { const computeStructLayout = (types) => {
const entries = []; const fields = [];
let byteOffset = 0; let byteOffset = 0;
for (const type of types) { for (const type of types) {
if (supportedLayoutTypes[type] == null) { if (supportedTypes[type] == null) {
throw new Error(`Unsupported type: ${type}`); throw new Error(`Unsupported type: ${type}`);
} }
const { alignAtByte, sizeInBytes, baseType } = supportedLayoutTypes[type]; const [alignAtByte, sizeInBytes, baseType] = supportedTypes[type];
byteOffset = Math.ceil(byteOffset / alignAtByte) * alignAtByte; byteOffset = Math.ceil(byteOffset / alignAtByte) * alignAtByte;
entries.push({ baseType, byteOffset }); fields.push({ baseType, byteOffset });
byteOffset += sizeInBytes; byteOffset += sizeInBytes;
} }
// console.log(types); // console.log(types);
// console.log(entries); // console.log(fields);
const size = byteOffset * Float32Array.BYTES_PER_ELEMENT; const size = byteOffset * Float32Array.BYTES_PER_ELEMENT;
return { return {
entries, fields,
size, size,
build: (values, buffer = null) => buildStruct(entries, values, buffer ?? new ArrayBuffer(size)), build: (values, buffer = null) => buildStruct(fields, values, buffer ?? new ArrayBuffer(size)),
}; };
}; };
const buildStruct = (entries, values, buffer) => { const buildStruct = (fields, values, buffer) => {
if (values.length !== entries.length) { if (values.length !== fields.length) {
throw new Error(`This struct contains ${entries.length} values, and you supplied ${values.length}.`); throw new Error(`This struct contains ${fields.length} values, and you supplied ${values.length}.`);
} }
const views = { const views = {
@@ -66,10 +66,10 @@ const buildStruct = (entries, values, buffer) => {
}; };
for (let i = 0; i < values.length; i++) { for (let i = 0; i < values.length; i++) {
const view = views[entries[i].baseType]; const view = views[fields[i].baseType];
const value = values[i]; const value = values[i];
const array = value[Symbol.iterator] == null ? [value] : value; const array = value[Symbol.iterator] == null ? [value] : value;
view.set(array, entries[i].byteOffset); view.set(array, fields[i].byteOffset);
} }
return buffer; return buffer;
}; };