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Combine vertex buffers

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This commit is contained in:
Brandon Dyck 2022-10-23 10:03:32 -06:00
parent b91ab4b547
commit 54ff9106db
1 changed files with 10 additions and 15 deletions
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25
panorama-viewer.js
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@ -109,27 +109,23 @@
gl.useProgram(program); gl.useProgram(program);
let vertexBuffer = gl.createBuffer(); let vertexBuffer = gl.createBuffer();
let vertices = new Float32Array([ let vertices = new Float32Array([
0, 0, 0, // x, y, z, u, v
1, 0, 0, 0, 0, 0, 0, 0,
1, 1, 0, 1, 0, 0, 1, 0,
1, 1, 0, 1, 1,
]); ]);
const vertexStride = 4 * 5;
const positionOffset = 0;
const textureCoordOffset = 4 * 3;
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer); gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW); gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
const positionLocation = gl.getAttribLocation(program, "position"); const positionLocation = gl.getAttribLocation(program, "position");
const textureCoordLocation = gl.getAttribLocation(program, "textureCoord");
// Load texture // Load texture
let image = document.getElementById("image"); let image = document.getElementById("image");
loadTexture(gl, image); loadTexture(gl, image);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true); gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
let textureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, textureCoordBuffer);
const textureCoords = new Float32Array([
0, 1,
1, 0,
1, 1,
]);
gl.bufferData(gl.ARRAY_BUFFER, textureCoords, gl.STATIC_DRAW);
const textureCoordLocation = gl.getAttribLocation(program, "textureCoord");
const render = () => { const render = () => {
gl.useProgram(program); gl.useProgram(program);
@ -142,12 +138,11 @@
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer); gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.enableVertexAttribArray(positionLocation); gl.enableVertexAttribArray(positionLocation);
gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, 4 * 3, 0); gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, vertexStride, positionOffset);
gl.drawArrays(gl.TRIANGLES, 0, 3); gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.bindBuffer(gl.ARRAY_BUFFER, textureCoordBuffer);
gl.enableVertexAttribArray(textureCoordLocation); gl.enableVertexAttribArray(textureCoordLocation);
gl.vertexAttribPointer(textureCoordLocation, 3, gl.FLOAT, false, 4 * 2, 0); gl.vertexAttribPointer(textureCoordLocation, 2, gl.FLOAT, false, vertexStride, textureCoordOffset);
requestAnimationFrame(render); requestAnimationFrame(render);
}; };