85 lines
1.9 KiB
TypeScript
85 lines
1.9 KiB
TypeScript
export interface GlCanvasBuffers {
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position: WebGLBuffer,
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normal: WebGLBuffer,
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textureCoord: WebGLBuffer,
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indices: WebGLBuffer,
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};
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export function initBuffers(gl: WebGLRenderingContext): GlCanvasBuffers {
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const positionBuffer = initPositionBuffer(gl);
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const textureCoordBuffer = initTextureBuffer(gl);
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const indexBuffer = initIndexBuffer(gl);
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const normalBuffer = initNormalBuffer(gl);
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return {
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position: positionBuffer,
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normal: normalBuffer,
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textureCoord: textureCoordBuffer,
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indices: indexBuffer,
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};
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}
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function initPositionBuffer(gl: WebGLRenderingContext) {
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const positionBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
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const positions = [
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-1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0,
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];
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gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
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return positionBuffer;
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}
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function initIndexBuffer(gl: WebGLRenderingContext) {
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const indexBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
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const indices = [
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0, 1, 2,
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0, 2, 3,
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];
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gl.bufferData(
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gl.ELEMENT_ARRAY_BUFFER,
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new Uint16Array(indices),
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gl.STATIC_DRAW
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);
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return indexBuffer;
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}
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function initTextureBuffer(gl: WebGLRenderingContext) {
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const textureCoordBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, textureCoordBuffer);
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const textureCoordinates = [
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0.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0,
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];
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gl.bufferData(
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gl.ARRAY_BUFFER,
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new Float32Array(textureCoordinates),
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gl.STATIC_DRAW
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);
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return textureCoordBuffer;
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}
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function initNormalBuffer(gl: WebGLRenderingContext) {
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const normalBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, normalBuffer);
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const vertexNormals = [
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0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0,
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];
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gl.bufferData(
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gl.ARRAY_BUFFER,
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new Float32Array(vertexNormals),
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gl.STATIC_DRAW
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);
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return normalBuffer;
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}
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