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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>Bug 1426289 - vertexAttrib4f should actually update.</title>
<script src='/tests/SimpleTest/SimpleTest.js'></script>
<link rel='stylesheet' href='/tests/SimpleTest/test.css'>
<script src='webgl-util.js'></script>
</head>
<body>
<script id='eVertSource' type='none'>
attribute vec4 aColor;
varying vec4 vColor;
void main() {
gl_PointSize = 64.0;
gl_Position = vec4(vec3(0.0), 1.0);
vColor = aColor;
}
</script>
<script id='eFragSource' type='none'>
precision mediump float;
varying vec4 vColor;
void main() {
gl_FragColor = vColor;
}
</script>
<script>
const canvas = document.createElement('canvas');
canvas.width = 1;
canvas.height = 1;
const gl = canvas.getContext('webgl');
const prog = WebGLUtil.linkProgramByIds(gl, eVertSource, eFragSource);
gl.useProgram(prog);
function getRgb() {
const data = new Uint32Array(1);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(data.buffer));
return data[0] & 0xffffff;
}
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
let was = getRgb();
ok(was == 0x000000, '0x'+was.toString(16));
gl.disableVertexAttribArray(prog.aColor);
gl.vertexAttrib4f(prog.aColor, 1, 0, 0, 1);
gl.drawArrays(gl.POINTS, 0, 1);
was = getRgb();
ok(was == 0x0000ff, '0x'+was.toString(16));
gl.vertexAttrib4f(prog.aColor, 0, 1, 0, 1);
gl.drawArrays(gl.POINTS, 0, 1);
was = getRgb();
ok(was == 0x00ff00, '0x'+was.toString(16));
</script>
</body>
</html>
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