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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>Canvas Compositing 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>
Below are 2 50x50 pixel canvas but using CSS to display them at 100x100 pixels. <br/>
They are solid black with a red triangle<br/>
They each have a 10px CSS solid black border around them.<br/>
Depending on how the browser composites the canvas with the page they will get
a white outline<hr/>
<div>
2d canvas<br/>
<canvas id="example2" width="50" height="50" style="width: 100px; height: 100px; border: 10px solid black;"></canvas>
</div>
<hr/>
3d canvas<br/>
<div>
<canvas id="example" width="50" height="50" style="width: 100px; height: 100px; border: 10px solid black;"></canvas>
</div>
<hr/>
img tag<br/>
<img src="50x50pixel-black-with-red-triangle.png" style="width: 100px; height: 100px; border: 10px solid black;"/>
<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>
"use strict";
function init()
{
var wtu = WebGLTestUtils;
var canvas2d = document.getElementById("example2");
var ctx2d = canvas2d.getContext("2d");
ctx2d.fillStyle = "rgba(0, 0, 0, 255)"
ctx2d.fillRect(0, 0, 50, 50);
ctx2d.fillStyle = "rgba(255, 0, 0, 255)"
ctx2d.beginPath();
ctx2d.moveTo(25, 12.5);
ctx2d.lineTo(12.5, 37.5);
ctx2d.lineTo(37.5, 37.5);
ctx2d.lineTo(25, 12.5);
ctx2d.fill();
var gl = wtu.create3DContext("example");
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
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);
}
init();
var successfullyParsed = true;
</script>
</body>
<script src="../js/js-test-post.js"></script>
</body>
</html>
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