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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.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test readBuffer Against WebGL 2</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="canvas" width="20" height="20"> </canvas>
<script>
"use strict";
description("This tests reading from fbo");
var clearDrawingbuffer = function(color) {
gl.clearColor(color[0] / 255, color[1] / 255, color[2] / 255, color[3] / 255);
gl.clear(gl.COLOR_BUFFER_BIT);
}
var validateReadingFromFramebuffer = function(color, expected, msg) {
var pixels = new Uint8Array(1 * 1 * 4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
wtu.glErrorShouldBe(gl, expected, msg);
if (expected == gl.NO_ERROR)
wtu.checkCanvasRect(gl, 0, 0, canvas.width, canvas.height, color,
"the color should be [" + color + "]");
}
var setupRenderbuffer = function(attachment) {
var renderbuffer = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, attachment, gl.RENDERBUFFER, renderbuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA8, canvas.width, canvas.height);
return renderbuffer;
}
var testReadBufferOnDefaultFB = function() {
gl.readBuffer(gl.NONE);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"calling readBuffer with GL_NONE on the default framebuffer should succeed.");
var pixels = new Uint8Array(1 * 1 * 4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
"should generate INVALID_OPERATION when reading from framebuffer and read buffer is GL_NONE.");
gl.readBuffer(gl.BACK);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"calling readBuffer with GL_BACK on the default framebuffer should succeed.");
gl.readBuffer(gl.COLOR_ATTACHMENT0);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
"calling readBuffer with GL_COLOR_ATTACHMENT0 on the default framebuffer should generate INVALID_OPERATION.");
}
var testReadBufferOnFBO = function() {
gl.readBuffer(gl.BACK);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
"calling readBuffer with GL_BACK on fbo should generate INVALID_OPERATION.");
gl.readBuffer(gl.NONE);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"calling readBuffer with GL_NONE on fbo should succeed.");
var pixels = new Uint8Array(1 * 1 * 4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
"should generate INVALID_OPERATION when reading from framebuffer and read buffer is GL_NONE.");
gl.readBuffer(gl.COLOR_ATTACHMENT0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"calling readBuffer with GL_COLOR_ATTACHMENT0 on fbo should succeed.");
var maxColorAttachments = gl.getParameter(gl.MAX_COLOR_ATTACHMENTS);
gl.readBuffer(gl.COLOR_ATTACHMENT0 + maxColorAttachments);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
"calling readBuffer with GL_COLOR_ATTACHMENTi that exceeds MAX_COLOR_ATTACHMENT on fbo should generate INVALID_OPERATION.");
gl.readBuffer(gl.COLOR_ATTACHMENT1);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"calling readBuffer with GL_COLOR_ATTACHMENT1 on the fbo should succeed.");
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT1');
}
debug("");
debug("Canvas.getContext");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas, undefined, 2);
if (!gl) {
testFailed("context does not exist");
} else {
testPassed("context exists");
debug("");
debug("Checking reading from framebuffer.");
// Test on the default framebuffer. Read buffer is GL_BACK by default.
var backColor = [0, 0, 0, 255];
clearDrawingbuffer(backColor);
validateReadingFromFramebuffer(backColor, gl.NO_ERROR,
"should be no errors when reading from GL_BACK on the default framebuffer.");
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.BACK');
testReadBufferOnDefaultFB();
// Test on fbo. Read buffer is GL_COLOR_ATTACHMENT0 by default
var fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
var colorbuffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0);
var red = [255, 0, 0, 255];
clearDrawingbuffer(red);
validateReadingFromFramebuffer(red, gl.NO_ERROR,
"should be no errors when reading from GL_COLOR_ATTACHMENT0 on fbo.");
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT0');
testReadBufferOnFBO();
// Test on user defined read buffer (GL_COLOR_ATTACHMENT1) with or without corresponding image on fbo.
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
var colorbuffer1 = setupRenderbuffer(gl.COLOR_ATTACHMENT1);
var green = [0, 255, 0, 255];
gl.drawBuffers([gl.NONE, gl.COLOR_ATTACHMENT1]);
clearDrawingbuffer(green);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error after setup and clear render buffer");
gl.readBuffer(gl.COLOR_ATTACHMENT1);
validateReadingFromFramebuffer(green, gl.NO_ERROR,
"should be no errors when reading from GL_COLOR_ATTACHMENT1 on fbo.");
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT1');
// Need to reset draw buffers, otherwise it triggers a mac driver bug.
// We add a separate test for that bug: conformance2/rendering/framebuffer-completeness-unaffected.html
gl.drawBuffers([gl.COLOR_ATTACHMENT0]);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.RENDERBUFFER, null)
gl.readBuffer(gl.COLOR_ATTACHMENT1);
validateReadingFromFramebuffer(null, gl.INVALID_OPERATION,
"should generate INVALID_OPERATION when reading from GL_COLOR_ATTACHMENT1 but this attachment has no image currently.");
// switch to another fbo, read buffer is GL_COLOR_ATTACHMENT0, not GL_COLOR_ATTACHMENT1
var fb1 = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb1);
var buffer = setupRenderbuffer(gl.COLOR_ATTACHMENT0);
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.COLOR_ATTACHMENT0');
var blue = [0, 0, 255, 255];
clearDrawingbuffer(blue);
validateReadingFromFramebuffer(blue, gl.NO_ERROR,
"should be no errors when reading from GL_COLOR_ATTACHMENT0 on another fbo.");
// switch from fbo to default fb, read buffer will switch to GL_BACK from GL_COLOR_ATTACHMENT0
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
shouldBe('gl.getParameter(gl.READ_BUFFER)', 'gl.BACK');
validateReadingFromFramebuffer(backColor, gl.NO_ERROR,
"should be no errors when reading from GL_BACK on the default framebuffer.");
gl.deleteFramebuffer(fb);
gl.deleteRenderbuffer(colorbuffer);
gl.deleteRenderbuffer(colorbuffer1);
gl.deleteFramebuffer(fb1);
gl.deleteRenderbuffer(buffer);
}
debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
