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<!--
Copyright (c) 2011 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../resources/js-test-pre.js"></script>
<script src="../resources/webgl-test.js"></script>
</head>
<body>
<canvas id="example" width="1px" height="1px"></canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vs" type="x-shader/x-vertex">
attribute vec4 vPosition;
attribute vec4 vColor;
varying vec4 color;
void main() {
gl_Position = vPosition;
color = vColor;
}
</script>
<script id="fs" type="x-shader/x-fragment">
precision mediump float;
varying vec4 color;
void main() {
gl_FragColor = color;
}
</script>
<script>
description('Test that updating the size of a vertex buffer is properly noticed by the WebGL implementation.')
var gl = initWebGL("example", "vs", "fs", ["vPosition", "vColor"], [0, 0, 0, 1], 1);
glErrorShouldBe(gl, gl.NO_ERROR, "after initialization");
gl.useProgram(gl.program);
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
[-1,1,0, 1,1,0, -1,-1,0,
-1,-1,0, 1,1,0, 1,-1,0]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
glErrorShouldBe(gl, gl.NO_ERROR, "after vertex setup");
var texCoordObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
[0,0, 1,0, 0,1,
0,1, 1,0, 1,1]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
glErrorShouldBe(gl, gl.NO_ERROR, "after texture coord setup");
// Now resize these buffers because we want to change what we're drawing.
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
-1,1,0, 1,1,0, -1,-1,0, 1,-1,0,
-1,1,0, 1,1,0, -1,-1,0, 1,-1,0]), gl.STATIC_DRAW);
glErrorShouldBe(gl, gl.NO_ERROR, "after vertex redefinition");
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
0, 255, 0, 255,
0, 255, 0, 255,
0, 255, 0, 255,
0, 255, 0, 255]), gl.STATIC_DRAW);
gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, false, 0, 0);
glErrorShouldBe(gl, gl.NO_ERROR, "after texture coordinate / color redefinition");
var numQuads = 2;
var indices = new Uint8Array(numQuads * 6);
for (var ii = 0; ii < numQuads; ++ii) {
var offset = ii * 6;
var quad = (ii == (numQuads - 1)) ? 4 : 0;
indices[offset + 0] = quad + 0;
indices[offset + 1] = quad + 1;
indices[offset + 2] = quad + 2;
indices[offset + 3] = quad + 2;
indices[offset + 4] = quad + 1;
indices[offset + 5] = quad + 3;
}
var indexObject = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexObject);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");
gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);
glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
debug("")
successfullyParsed = true;
</script>
<script>finishTest();</script>
</body>
</html>
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