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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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<meta charset="utf-8">
<title>WebGL BlitFramebuffer Resolve to Back Buffer</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
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<script src="../../js/webgl-test-utils.js"></script>
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"use strict";
var wtu = WebGLTestUtils;
description("This test verifies the behavior of blitFramebuffer when resolving directly to the back buffer.");
function runTest(testParams) {
const sz = 64;
if (testParams.multisampled === undefined) {
testParams.multisampled = true;
}
debug('');
debug('Testing with alpha = ' + testParams.attribs.alpha +
', antialias = ' + testParams.attribs.antialias +
', internalformat = ' + testParams.internalformat +
', multisampled = ' + testParams.multisampled);
var canvas = document.createElement('canvas');
canvas.width = sz;
canvas.height = sz;
document.getElementById('canvasHeader').appendChild(canvas);
var gl = wtu.create3DContext(canvas, testParams.attribs, 2);
// Find the supported samples for a multisampled renderbuffer of the appropriate internal format.
let samples = [0];
if (testParams.multisampled) {
samples = gl.getInternalformatParameter(gl.RENDERBUFFER, gl[testParams.internalformat], gl.SAMPLES);
if (!samples || !samples.length) {
testFailed("At least one multisampled format is required to be supported");
return;
}
}
// Create a framebuffer with a multisampled renderbuffer.
let rb = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, rb);
gl.renderbufferStorageMultisample(gl.RENDERBUFFER, samples[0], gl[testParams.internalformat], sz, sz);
// Create a framebuffer.
let fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rb);
// Check for completeness.
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
testFailed("Rendering to a multisampled renderbuffer of format " + testParams.internalformat + " is required by the spec");
return;
}
// Clear to specified color.
gl.clearColor.apply(gl, testParams.clearColor);
gl.clear(gl.COLOR_BUFFER_BIT);
// Unbind draw framebuffer. Read framebuffer is now user framebuffer;
// draw framebuffer is default framebuffer.
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors before blit");
// Blit from user framebuffer to default framebuffer.
gl.blitFramebuffer(0, 0, sz, sz, 0, 0, sz, sz, gl.COLOR_BUFFER_BIT, gl.NEAREST);
if (testParams.shouldSucceed) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be legal to blit/resolve to default back buffer");
} else {
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "incompatible src/dest blitFramebuffer combination must fail");
}
// Unbind user framebuffer completely.
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, null);
if (testParams.shouldSucceed) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error before readback");
wtu.checkCanvasRect(gl, 0, 0, 8, 8, testParams.resultColor);
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
}
}
var tests = [
// No-alpha, no-antialias, RGB8 source
{
attribs: {
alpha: false,
antialias: false,
},
internalformat: 'RGB8',
clearColor: [ 0.0, 1.0, 0.0, 0.5 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: true,
},
// No-alpha, no-antialias, RGBA8 source
{
attribs: {
alpha: false,
antialias: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 0.5 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// No-alpha, no-antialias, RGBA8 source, single-sampled blit
{
attribs: {
alpha: false,
antialias: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 0.5 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: true,
multisampled: false,
},
// Alpha, no-antialias, RGB8 source
{
attribs: {
alpha: true,
antialias: false,
},
internalformat: 'RGB8',
clearColor: [ 0.0, 1.0, 0.0, 1.0 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// No-alpha, no-antialias, RGBA8 source
// premultiplyAlpha:false just to avoid semantically incorrect
// colors (should only affect rendering, not contents of WebGL
// back buffer)
{
attribs: {
alpha: false,
antialias: false,
premultiplyAlpha: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 1.0 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// Alpha, no-antialias, RGBA8 source
// premultiplyAlpha:false just to avoid semantically incorrect
// colors (should only affect rendering, not contents of WebGL
// back buffer)
{
attribs: {
alpha: true,
antialias: false,
premultiplyAlpha: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 0.0 ],
resultColor: [ 0, 255, 0, 0 ],
shouldSucceed: true,
},
// All attempts to blit to an antialiased back buffer should fail.
// No-alpha, antialias, RGB8 source
{
attribs: {
alpha: false,
antialias: true,
},
internalformat: 'RGB8',
clearColor: [ 0.0, 1.0, 0.0, 1.0 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// Alpha, antialias, RGB8 source
{
attribs: {
alpha: true,
antialias: true,
},
internalformat: 'RGB8',
clearColor: [ 0.0, 1.0, 0.0, 1.0 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// No-alpha, antialias, RGBA8 source
// premultiplyAlpha:false just to avoid semantically incorrect
// colors (should only affect rendering, not contents of WebGL
// back buffer)
{
attribs: {
alpha: false,
antialias: true,
premultiplyAlpha: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 1.0 ],
resultColor: [ 0, 255, 0, 255 ],
shouldSucceed: false,
},
// Alpha, antialias, RGBA8 source
// premultiplyAlpha:false just to avoid semantically incorrect
// colors (should only affect rendering, not contents of WebGL
// back buffer)
{
attribs: {
alpha: true,
antialias: true,
premultiplyAlpha: false,
},
internalformat: 'RGBA8',
clearColor: [ 0.0, 1.0, 0.0, 0.0 ],
resultColor: [ 0, 255, 0, 0 ],
shouldSucceed: false,
},
];
for (var ii in tests) {
runTest(tests[ii]);
}
var successfullyParsed = true;
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