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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>WebGL test: Drawing without index validation</title>
<script src='/tests/SimpleTest/SimpleTest.js'></script>
<link rel='stylesheet' href='/tests/SimpleTest/test.css'>
<script id='vertSource' type='none'>
void main(void) {
gl_PointSize = 1.0;
gl_Position = vec4(0, 0, 0, 1);
}
</script>
<script id='fragSource' type='none'>
precision mediump float;
void main(void) {
gl_FragColor = vec4(0, 1, 0, 1);
}
</script>
</head>
<body>
<script>
function test() {
const c = document.createElement('canvas');
c.width = c.height = 1;
const gl = c.getContext('webgl');
if (!gl) {
todo(false, 'WebGL is unavailable.');
return;
}
document.body.appendChild(c);
const vs = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vs, vertSource.innerHTML.trim());
gl.compileShader(vs);
const fs = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fs, fragSource.innerHTML.trim());
gl.compileShader(fs);
const prog = gl.createProgram();
gl.attachShader(prog, vs);
gl.attachShader(prog, fs);
gl.linkProgram(prog);
gl.useProgram(prog);
gl.clearColor(1,0,0,1);
const pixel = new Uint32Array(1);
const pixelData = new Uint8Array(pixel.buffer);
function expectPixel(expected, info) {
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixelData);
ok(pixel[0] == expected,
'[' + info + '] Expected 0x' + expected.toString(16) + ', was 0x' + pixel[0].toString(16));
}
gl.clear(gl.COLOR_BUFFER_BIT);
expectPixel(0xFF0000FF, 'Clear');
gl.drawArrays(gl.POINTS, 0, 1);
expectPixel(0xFF00FF00, 'DrawArrays');
const indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0]), gl.STATIC_DRAW);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.drawElements(gl.POINTS, 1, gl.UNSIGNED_SHORT, 0);
expectPixel(0xFF00FF00, 'DrawElements');
SimpleTest.finish();
}
SimpleTest.waitForExplicitFinish();
const prefArrArr = [
['webgl.force-index-validation', -1]
];
const prefEnv = {'set': prefArrArr};
SpecialPowers.pushPrefEnv(prefEnv, test);
</script>
</body>
</html>
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