draw-webgl-to-canvas-test.html

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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.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL Canvas Conformance Tests</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>

<div id="description"></div>

<div id="console"></div>

<canvas id="canvas2d_0" width="400" height="400"> </canvas>

<canvas id="canvas2d_1" width="400" height="400"> </canvas>

<canvas id="canvas2d_2" width="400" height="400"> </canvas>

<canvas id="webgl" width="400" height="400"> </canvas>

<script>

"use strict";

description("This test ensures WebGL implementations interact correctly with the canvas 2D drawImage call.");

var err;

var wtu = WebGLTestUtils;

var canvas2d = [];

var ctx2d = [];

for (var i = 0; i < 3; i ++) {

  canvas2d[i] = document.getElementById("canvas2d_" + i);

  ctx2d[i] = canvas2d[i].getContext("2d");

var canvas = document.getElementById("webgl");

var gl = wtu.create3DContext(canvas);

if (!gl) {

  testFailed("context does not exist");

} else {

  testPassed("context exists");

  debug("");

  debug("Checking canvas and WebGL drawImage interaction");

  for (var count = 0; count < 10; count ++) {

    gl.clearColor(0.25, 0.5, 0.75, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    ctx2d[0].drawImage(canvas, 0, 0, canvas2d[0].width, canvas2d[0].height);

    gl.clearColor(1, 0, 0, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    ctx2d[1].drawImage(canvas, 0, 0, canvas2d[1].width, canvas2d[1].height);

    gl.clearColor(1, 0, 1, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    ctx2d[2].drawImage(canvas, 0, 0, canvas2d[2].width, canvas2d[2].height);

    gl.clearColor(1, 1, 0, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    wtu.checkCanvasRect(ctx2d[0], 0, 0, canvas2d[0].width, canvas2d[0].height, [64, 128, 192, 255],

                        "drawImage: Should be [64, 128, 192, 255]", 2);

    wtu.checkCanvasRect(ctx2d[1], 0, 0, canvas2d[1].width, canvas2d[1].height, [255, 0, 0, 255],

                        "drawImage: Should be [255, 0, 0, 255]", 2);

    wtu.checkCanvasRect(ctx2d[2], 0, 0, canvas2d[2].width, canvas2d[2].height, [255, 0, 255, 255],

                        "drawImage: Should be [255, 0, 255, 255]", 2);

  err = gl.getError();

  debug("");

finishTest();

</script>

</body>

</html>