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Add GPU lookup texture data generation for materials

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This commit is contained in:
Jared Miller 2026-03-11 13:23:28 -04:00
parent bc2c8fa270
commit a1e164454d
Signed by: shmup
GPG key ID: 22B5C6D66A38B06C
2 changed files with 75 additions and 0 deletions
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47
src/__tests__/materials.test.ts
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@ -1,4 +1,8 @@
import { describe, expect, test } from "bun:test";
import {
generateColorData,
generateLookupData,
} from "../materials/lookupTexture";
import { MaterialRegistry } from "../materials/registry";
import {
BEHAVIOR_GAS,
@ -72,3 +76,46 @@ describe("MaterialRegistry", () => {
expect(() => reg.get(254)).toThrow();
});
});
describe("lookup texture generation", () => {
test("generates 256-entry property array", () => {
const reg = new MaterialRegistry();
const data = generateLookupData(reg);
expect(data.length).toBe(256 * 4);
});
test("sand properties at correct offset", () => {
const reg = new MaterialRegistry();
const data = generateLookupData(reg);
const sand = reg.getByName("sand")!;
const offset = sand.id * 4;
expect(data[offset + 0]).toBe(BEHAVIOR_POWDER);
expect(data[offset + 1]).toBeCloseTo(1.5);
expect(data[offset + 2]).toBeCloseTo(0.1);
});
test("generates 256-entry color array", () => {
const reg = new MaterialRegistry();
const data = generateColorData(reg);
expect(data.length).toBe(256 * 4);
});
test("sand color at correct offset", () => {
const reg = new MaterialRegistry();
const data = generateColorData(reg);
const sand = reg.getByName("sand")!;
const offset = sand.id * 4;
expect(data[offset + 0]).toBeCloseTo(0.76);
expect(data[offset + 1]).toBeCloseTo(0.7);
expect(data[offset + 2]).toBeCloseTo(0.5);
expect(data[offset + 3]).toBeCloseTo(1.0);
});
test("unregistered ids default to air properties", () => {
const reg = new MaterialRegistry();
const data = generateLookupData(reg);
const offset = 200 * 4;
expect(data[offset + 0]).toBe(0);
expect(data[offset + 1]).toBe(0);
});
});

28
src/materials/lookupTexture.ts Normal file
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@ -0,0 +1,28 @@
import type { MaterialRegistry } from "./registry";
// generates flat Float32 array for material properties texture (256x1 RGBA)
// R: behavior type, G: density, B: hardness, A: angleOfRepose / 90
export function generateLookupData(registry: MaterialRegistry): Float32Array {
const data = new Float32Array(256 * 4);
for (const m of registry.all()) {
const offset = m.id * 4;
data[offset + 0] = m.behavior;
data[offset + 1] = m.density;
data[offset + 2] = m.hardness;
data[offset + 3] = m.angleOfRepose / 90.0;
}
return data;
}
// generates flat Float32 array for material color texture (256x1 RGBA)
export function generateColorData(registry: MaterialRegistry): Float32Array {
const data = new Float32Array(256 * 4);
for (const m of registry.all()) {
const offset = m.id * 4;
data[offset + 0] = m.color[0];
data[offset + 1] = m.color[1];
data[offset + 2] = m.color[2];
data[offset + 3] = m.color[3];
}
return data;
}