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Bug 1751205 - Part 2. Ensure we y-flip surfaces with OffscreenCanvas …
…if needed. r=gfx-reviewers,jgilbert On the path that we need to read the pixels from the canvas for display purposes, instead of using a platform buffer handle, we need to take into account the need to y-flip for WebGL. This patch ensures that we do so. Differential Revision: https://phabricator.services.mozilla.com/D136504
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124
dom/canvas/test/reftest/webgl-color-offscreen-test.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| <!DOCTYPE html> | ||
| <meta charset='UTF-8'> | ||
| <!-- | ||
| Color Test | ||
| Clear the four quadrants of the canvas as follows: | ||
| +------+------+ | ||
| | blue |black | | ||
| | | | | ||
| +------+------+ | ||
| | red |green | | ||
| | | | | ||
| +------+------+ | ||
| Clear with a given alpha value. What effect this has depends on the | ||
| context-creation args passed to this page. | ||
| --> | ||
| <html class='reftest-wait'> | ||
|
|
||
| <head> | ||
| <script type='text/javascript' src='webgl-utils.js'></script> | ||
| <script type='text/javascript'> | ||
| 'use strict'; | ||
|
|
||
| var COLOR_VALUE = 127.0 / 255.0; | ||
| var ALPHA_VALUE = 127.0 / 255.0; | ||
|
|
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| function renderFrame(gl) { | ||
| gl.enable(gl.SCISSOR_TEST); | ||
|
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| gl.scissor(0, 0, 100, 100); | ||
| gl.clearColor(COLOR_VALUE, 0.0, 0.0, ALPHA_VALUE); | ||
| gl.clear(gl.COLOR_BUFFER_BIT); | ||
|
|
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| gl.scissor(100, 0, 100, 100); | ||
| gl.clearColor(0.0, COLOR_VALUE, 0.0, ALPHA_VALUE); | ||
| gl.clear(gl.COLOR_BUFFER_BIT); | ||
|
|
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| gl.scissor(0, 100, 100, 100); | ||
| gl.clearColor(0.0, 0.0, COLOR_VALUE, ALPHA_VALUE); | ||
| gl.clear(gl.COLOR_BUFFER_BIT); | ||
|
|
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| gl.scissor(100, 100, 100, 100); | ||
| gl.clearColor(0.0, 0.0, 0.0, ALPHA_VALUE); | ||
| gl.clear(gl.COLOR_BUFFER_BIT); | ||
| } | ||
|
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| //////////////////////////////////////////////////////////////////////////////// | ||
| // Boilerplate | ||
|
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| var TIMEOUT_MS = 30 * 1000; | ||
|
|
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| function setStatus(text) { | ||
| var elem = document.getElementById('status'); | ||
| elem.innerHTML = text; | ||
| } | ||
|
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| var gIsComplete = false; | ||
|
|
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| function markComplete(statusText) { | ||
| if (!statusText) | ||
| statusText = ''; | ||
|
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| if (gIsComplete) | ||
| return; | ||
| gIsComplete = true; | ||
|
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| setStatus(statusText); | ||
| document.documentElement.removeAttribute('class'); | ||
| } | ||
|
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| function markError(text) { | ||
| markComplete('Error: ' + text); | ||
| } | ||
|
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| function markTimedOut() { | ||
| markError('Timed out waiting on test completion.'); | ||
| } | ||
|
|
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| function runFrame(gl, frameCount, maxFrameCount) { | ||
| renderFrame(gl); | ||
| frameCount++; | ||
|
|
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| if (frameCount >= maxFrameCount) { | ||
| console.log('Rendered ' + frameCount + ' frames.'); | ||
| markComplete(); | ||
| return; | ||
| } | ||
|
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| requestAnimationFrame(function(){ | ||
| runFrame(gl, frameCount, maxFrameCount); | ||
| }); | ||
| } | ||
|
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| function runTest() { | ||
| var canvas = document.getElementById('canvas'); | ||
| var offscreenCanvas = canvas.transferControlToOffscreen(); | ||
|
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| var gl = initGL(offscreenCanvas); | ||
| if (!gl) { | ||
| markError('WebGL context creation failed.'); | ||
| return; | ||
| } | ||
|
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| var maxFrameCount = arg('frame', 1); | ||
| if (maxFrameCount < 1) { | ||
| markError('Invalid `frame` arg: ' + maxFrameCount); | ||
| return; | ||
| } | ||
|
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| setStatus('Waiting...'); | ||
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| runFrame(gl, 0, maxFrameCount); | ||
| setTimeout(markTimedOut, TIMEOUT_MS); | ||
| } | ||
| </script> | ||
| </head> | ||
|
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| <body onload='runTest();'> | ||
| <canvas id='canvas' width='200' height='200'></canvas> | ||
| <div id='status'></div> | ||
| </body> | ||
|
|
||
| </html> |
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