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geometry: sample pixels from their centers

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This commit is contained in:
Paul Mathieu 2022-10-18 14:01:02 -07:00
parent 60a2e8f19e
commit ef88325fc8
1 changed files with 14 additions and 10 deletions
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24
geometry.js
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@ -1,18 +1,22 @@
import { memoize } from "./memoize"; import { memoize } from "./memoize";
function _makeTextureFace(texture) { function _makeTextureFace(texture) {
const textMul = 0.0625; const textureWidth = 16;
const textOff = texture.map(x => x * textMul); const texturesPerAtlas = 16;
const textMul = 1 / texturesPerAtlas;
const halfPixel = 1 / texturesPerAtlas / textureWidth / 2;
const textOff = texture.map(x => x * textMul + halfPixel);
const a = textMul / textureWidth * (textureWidth - 1);
const textuv = [ const textuv = [
[0.99, 0.99], [1, 1],
[0.01, 0.99], [0, 1],
[0.01, 0.01], [0, 0],
[0.99, 0.99], [1, 1],
[0.01, 0.01], [0, 0],
[0.99, 0.01], [1, 0],
]; ];
const textures = textuv.map(uv => uv.map((x, j) => textMul * x + textOff[j])); const textures = textuv.map(uv => uv.map((x, j) => a * x + textOff[j]));
return textures; return textures;
} }
@ -124,4 +128,4 @@ export function makeBufferFromFaces(gl, faces) {
numVertices, numVertices,
delete: () => gl.deleteBuffer(glBuffer), delete: () => gl.deleteBuffer(glBuffer),
}; };
} }