<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script src="resources/canvas_runner.js"></script>
<script>
var canvas2D = document.createElement("canvas");
var ctx2D = canvas2D.getContext("2d");
var canvas3D = document.createElement('canvas');
var gl = canvas3D.getContext('experimental-webgl');
if (!gl)
    CanvasRunner.logFatalError("\nWebGL is not supported or enabled on this platform!\n");

function setSize(canvas2DWidth, canvas2DHeight, webglWidth, webglHeight) {
    canvas2D.width = canvas2DWidth;
    canvas2D.height = canvas2DHeight;
    canvas3D.width = webglWidth;
    canvas3D.height = webglHeight;
}

function rand(range) {
    return Math.floor(Math.random() * range);
}

function renderWebGL(gl) {
    gl.disable(gl.SCISSOR_TEST);
    gl.clear(gl.COLOR_BUFER_BIT);
    gl.enable(gl.SCISSOR_TEST);
    gl.scissor(rand(1024), rand(1024), rand(1024), rand(1024));
    gl.clearColor(Math.random(), Math.random(), Math.random(), 1);
    gl.clear(gl.COLOR_BUFFER_BIT);
}

function doRun() {
    // draw static WebGL
    ctx2D.drawImage(canvas3D, 0, 0);
}

function ensureComplete() {
    // Calling getImageData() is just to flush out the content when
    // accelerated 2D canvas is in use. The cost of reading 1x1 pixels is low.
    ctx2D.getImageData(0, 0, 1, 1);
}

window.onload = function () {
    // It should use setMinimumAccelerated2dCanvasSize() to enable accelerated Canvas for a specified size
    // but this API is not available in JS or WebPage. Assume the threshold size is 256x257
    // and the dest canvas is HW accelerated Canvas when setting its size to 1024x1024.
    setSize(1024, 1024, 1024, 1024);
    renderWebGL(gl);
    CanvasRunner.start({
        description: "This bench test checks the speed on drawing static WebGL(1024x1024) to HW accelerated Canvas2D(1024x1024).",
        doRun: doRun,
        ensureComplete: ensureComplete});
}

</script>
</body>
</html>