luboslenco
52 lines
1.7 KiB
TypeScript
52 lines
1.7 KiB
TypeScript
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class GeomPlane {
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posa: Int16Array = null;
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nora: Int16Array = null;
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texa: Int16Array = null;
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inda: Uint32Array = null;
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scalePos = 1.0;
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scaleTex = 1.0;
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name = "";
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hasNext = false;
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constructor(sizeX = 1.0, sizeY = 1.0, vertsX = 2, vertsY = 2, uvScale = 1.0) {
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// Pack positions to (-1, 1) range
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let halfX = sizeX / 2;
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let halfY = sizeY / 2;
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this.scalePos = Math.max(halfX, halfY);
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let inv = (1 / this.scalePos) * 32767;
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this.posa = new Int16Array(vertsX * vertsY * 4);
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this.nora = new Int16Array(vertsX * vertsY * 2);
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this.texa = new Int16Array(vertsX * vertsY * 2);
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this.inda = new Uint32Array((vertsX - 1) * (vertsY - 1) * 6);
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let stepX = sizeX / (vertsX - 1);
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let stepY = sizeY / (vertsY - 1);
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for (let i = 0; i < vertsX * vertsY; ++i) {
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let x = (i % vertsX) * stepX - halfX;
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let y = Math.floor(i / vertsX) * stepY - halfY;
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this.posa[i * 4 ] = Math.floor(x * inv);
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this.posa[i * 4 + 1] = Math.floor(y * inv);
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this.posa[i * 4 + 2] = 0;
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this.nora[i * 2 ] = 0;
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this.nora[i * 2 + 1] = 0;
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this.posa[i * 4 + 3] = 32767;
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x = (i % vertsX) / (vertsX - 1);
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y = 1.0 - Math.floor(i / vertsX) / (vertsY - 1);
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this.texa[i * 2 ] = (Math.floor(x * 32767 * uvScale) - 1) % 32767;
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this.texa[i * 2 + 1] = (Math.floor(y * 32767 * uvScale) - 1) % 32767;
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}
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for (let i = 0; i < (vertsX - 1) * (vertsY - 1); ++i) {
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let x = i % (vertsX - 1);
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let y = Math.floor(i / (vertsY - 1));
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this.inda[i * 6 ] = y * vertsX + x;
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this.inda[i * 6 + 1] = y * vertsX + x + 1;
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this.inda[i * 6 + 2] = (y + 1) * vertsX + x;
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this.inda[i * 6 + 3] = y * vertsX + x + 1;
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this.inda[i * 6 + 4] = (y + 1) * vertsX + x + 1;
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this.inda[i * 6 + 5] = (y + 1) * vertsX + x;
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}
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}
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}
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