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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>WebGL buffer copying contents test.</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>
<script>
"use strict";
description("Test copying a buffer's contents to another buffer governed by the WebGL 2 spec.");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext(undefined, undefined, 2);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
var vertices = [
1.1, 1.0, 1.3,
-1.0, -1.0, -5.0,
5.3, -1.0, 1.0
];
debug("");
debug("Test copying between buffers returns correct data");
function testCopyBuffers(srcTarget, dstTarget, copyRead, copyWrite) {
var msg = "Copying from " + targetToString(gl, srcTarget) +
" to " + targetToString(gl, dstTarget)
if (copyRead && copyWrite)
msg += " via COPY_READ_BUFFER and COPY_WRITE_BUFFER"
else if (copyRead)
msg += " via COPY_READ_BUFFER"
else if (copyWrite)
msg += " via COPY_WRITE_BUFFER"
else
msg += " directly"
debug("")
debug(msg)
var srcBuffer = gl.createBuffer(), dstBuffer = gl.createBuffer();
var originalData = new Float32Array(vertices);
var length = vertices.length * 4;
gl.bindBuffer(srcTarget, srcBuffer);
gl.bufferData(srcTarget, originalData, gl.STATIC_DRAW);
if (copyRead)
gl.bindBuffer(gl.COPY_READ_BUFFER, srcBuffer);
gl.bindBuffer(dstTarget, dstBuffer);
gl.bufferData(dstTarget, new Float32Array(length), gl.STATIC_DRAW);
if (copyWrite)
gl.bindBuffer(gl.COPY_WRITE_BUFFER, dstBuffer);
var expectedGLError = gl.NO_ERROR;
if (srcTarget == dstTarget) {
if (!copyRead && copyWrite) {
// srcBuffer isn't bound to any targets because of setting up dstBuffer.
gl.bindBuffer(srcTarget, srcBuffer);
}
if (!copyRead && !copyWrite) {
// Same buffer object, overlapping range.
expectedGLError = gl.INVALID_VALUE;
}
}
if ((srcTarget == gl.ELEMENT_ARRAY_BUFFER &&
dstTarget != gl.ELEMENT_ARRAY_BUFFER) ||
(srcTarget != gl.ELEMENT_ARRAY_BUFFER &&
dstTarget == gl.ELEMENT_ARRAY_BUFFER)) {
expectedGLError = gl.INVALID_OPERATION;
}
gl.copyBufferSubData(copyRead ? gl.COPY_READ_BUFFER : srcTarget,
copyWrite ? gl.COPY_WRITE_BUFFER : dstTarget,
0, 0, length);
if (expectedGLError == gl.NO_ERROR) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Copying should work");
var retBuffer = new Uint8Array(length);
gl.getBufferSubData(dstTarget, 0, retBuffer);
wtu.glErrorShouldBe(gl, gl.NO_ERROR,
"gl.getBufferSubData(" + targetToString(gl, dstTarget) +
", 0, retBuffer) should work");
var failed = false;
var retArray = new Float32Array(retBuffer.buffer);
for (var i = 0; i < vertices.length; i++) {
if (originalData[i] != retArray[i]) {
failed = true;
break;
}
}
if (failed)
testFailed("The returned array buffer fails to match original data");
else
testPassed("The returned array buffer matches original data");
} else {
wtu.glErrorShouldBe(gl, expectedGLError, "Copying should fail");
}
gl.deleteBuffer(srcBuffer);
gl.deleteBuffer(dstBuffer);
shouldBeNull("gl.getParameter(gl.ARRAY_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.COPY_READ_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.COPY_WRITE_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.ELEMENT_ARRAY_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.PIXEL_PACK_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.PIXEL_UNPACK_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.TRANSFORM_FEEDBACK_BUFFER_BINDING)");
shouldBeNull("gl.getParameter(gl.UNIFORM_BUFFER_BINDING)");
}
function targetToString(gl, target) {
switch (target) {
case gl.ARRAY_BUFFER:
return "ARRAY_BUFFER";
case gl.COPY_READ_BUFFER:
return "COPY_READ_BUFFER";
case gl.COPY_WRITE_BUFFER:
return "COPY_WRITE_BUFFER";
case gl.ELEMENT_ARRAY_BUFFER:
return "ELEMENT_ARRAY_BUFFER";
case gl.PIXEL_PACK_BUFFER:
return "PIXEL_PACK_BUFFER";
case gl.PIXEL_UNPACK_BUFFER:
return "PIXEL_UNPACK_BUFFER";
case gl.TRANSFORM_FEEDBACK_BUFFER:
return "TRANSFORM_FEEDBACK_BUFFER";
case gl.UNIFORM_BUFFER:
return "UNIFORM_BUFFER";
default:
return "UNKNOWN BUFFER";
}
}
var targets = [
gl.ARRAY_BUFFER,
gl.ELEMENT_ARRAY_BUFFER,
gl.PIXEL_PACK_BUFFER,
gl.PIXEL_UNPACK_BUFFER,
gl.TRANSFORM_FEEDBACK_BUFFER,
gl.UNIFORM_BUFFER,
]
for (var srcIndex in targets) {
for (var dstIndex in targets) {
if (targets[srcIndex] != gl.TRANSFORM_FEEDBACK_BUFFER &&
targets[dstIndex] != gl.TRANSFORM_FEEDBACK_BUFFER) {
testCopyBuffers(targets[srcIndex], targets[dstIndex], true, true);
}
if (targets[srcIndex] != gl.TRANSFORM_FEEDBACK_BUFFER) {
testCopyBuffers(targets[srcIndex], targets[dstIndex], true, false);
}
if (targets[dstIndex] != gl.TRANSFORM_FEEDBACK_BUFFER) {
testCopyBuffers(targets[srcIndex], targets[dstIndex], false, true);
}
testCopyBuffers(targets[srcIndex], targets[dstIndex], false, false);
}
}
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
