| <!DOCTYPE html> |
| <html> |
| <body> |
| <script src="../resources/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) |
| PerfTestRunner.log("\nWebGL is not supported or enabled on this platform!\n"); |
| var MEASURE_DRAW_TIMES = 100; |
| var MAX_COUNT = 60000; |
| var count = 0; |
| |
| 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 drawWebGLToCanvas2D() { |
| if (gl) { |
| var start = PerfTestRunner.now(); |
| for (var i = 0; i < MEASURE_DRAW_TIMES; i++) { |
| renderWebGL(gl); |
| // draw dynamic WebGL |
| ctx2D.drawImage(canvas3D, 0, 0); |
| } |
| // 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); |
| count++; |
| |
| var elapsedTime = PerfTestRunner.now() - start; |
| PerfTestRunner.measureValueAsync(MEASURE_DRAW_TIMES * 1000 / elapsedTime); |
| } else |
| PerfTestRunner.measureValueAsync(0); |
| if (count < MAX_COUNT) |
| requestAnimationFrame(drawWebGLToCanvas2D); |
| } |
| |
| function onCompletedRun() { |
| count = MAX_COUNT; |
| } |
| |
| window.onload = function () { |
| PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'runs/s', |
| description: "This bench test checks the speed on drawing dynamic WebGL(1024x1024) to HW accelerated Canvas2D(1024x1024)."}); |
| // 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); |
| if (gl) |
| renderWebGL(gl); |
| drawWebGLToCanvas2D(); |
| } |
| |
| </script> |
| </body> |
| </html> |
