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<!DOCTYPE html>
<html>
<head>
<title>Rendering Test</title>
<script src="../../../resources/js-test.js"></script>
<script src="resources/webgl-test.js"> </script>
</head>
<body>
<canvas id="example" width="50" height="50">
There is supposed to be an example drawing here, but it's not important.
</canvas>
<div id="description"></div>
<div id="console"></div>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
gl_Position = vPosition;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
void main()
{
gl_FragColor = vec4(1.0,0.0,0.0,1.0);
}
</script>
<script>
function fail(x,y, buf, shouldBe)
{
var i = (y*50+x) * 4;
var reason = "pixel at ("+x+","+y+") is ("+buf[i]+","+buf[i+1]+","+buf[i+2]+","+buf[i+3]+"), should be "+shouldBe;
testFailed(reason);
}
function pass()
{
testPassed("drawing is correct");
}
function init()
{
if (window.initNonKhronosFramework) {
window.initNonKhronosFramework(false);
}
gl = initWebGL("example", "vshader", "fshader", [ "vPosition"], [ 0, 0, 0, 1 ], 1);
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawArrays(gl.TRIANGLES, 0, 3);
var buf = new Uint8Array(50 * 50 * 4);
gl.readPixels(0, 0, 50, 50, gl.RGBA, gl.UNSIGNED_BYTE, buf);
// Test several locations
// First line should be all black
for (var i = 0; i < 50; ++i)
if (buf[i*4] != 0 || buf[i*4+1] != 0 || buf[i*4+2] != 0 || buf[i*4+3] != 255) {
fail(i, 0, buf, "(0,0,0,255)");
return;
}
// Line 15 should be red for at least 10 red pixels starting 20 pixels in
var offset = (15*50+20) * 4;
for (var i = 0; i < 10; ++i)
if (buf[offset+i*4] != 255 || buf[offset+i*4+1] != 0 || buf[offset+i*4+2] != 0 || buf[offset+i*4+3] != 255) {
fail(20 + i, 15, buf, "(255,0,0,255)");
return;
}
// Last line should be all black
offset = (49*50) * 4;
for (var i = 0; i < 50; ++i)
if (buf[offset+i*4] != 0 || buf[offset+i*4+1] != 0 || buf[offset+i*4+2] != 0 || buf[offset+i*4+3] != 255) {
fail(i, 49, buf, "(0,0,0,255)");
return;
}
pass();
}
init();
</script>
</body>
</body>
</html>
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