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<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>gl-fragcoord Test</title>
<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
<script src="../../../js/js-test-pre.js"></script>
<script src="../../../js/webgl-test-utils.js"> </script>
</head>
<body>
<canvas id="example" width="32" height="32">
</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">
precision mediump float;
void main()
{
gl_FragColor = vec4(
gl_FrontFacing ? 1.0 : 0.0,
gl_FrontFacing ? 0.0 : 1.0,
0,
1);
}
</script>
<script>
"use strict";
function init()
{
description("tests gl_FrontFacing");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example");
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
var gridRes = 4;
wtu.setupIndexedQuad(gl, gridRes, 0, true);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawElements(gl.TRIANGLES, gridRes * gridRes * 6, gl.UNSIGNED_SHORT, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no errors from draw");
var step = 32 / gridRes;
var halfStep = step / 2;
var quarterStep = halfStep / 2;
for (var xx = 0; xx < 32; xx += step) {
for (var yy = 0; yy < 32; yy += step) {
for (var ii = 0; ii < 2; ++ii) {
var color = [
ii == 0 ? 255 : 0,
ii == 0 ? 0 : 255,
0
];
var msg = "should be " + color;
wtu.checkCanvasRect(
gl,
xx + quarterStep + halfStep * ii,
yy + quarterStep + halfStep * ii,
1, 1, color, msg, 4);
}
}
}
}
init();
var successfullyParsed = true;
</script>
<script src="../../../js/js-test-post.js"></script>
</body>
</html>
|
