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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 restrictions 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 buffer copying restrictions governed by the WebGL 2 spec. The test makes sure that copyBufferSubData acts as expected.");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext(undefined, undefined, 2);
var validTargets = [gl.ARRAY_BUFFER, gl.COPY_READ_BUFFER, gl.COPY_WRITE_BUFFER,
gl.ELEMENT_ARRAY_BUFFER, gl.PIXEL_PACK_BUFFER,
gl.PIXEL_UNPACK_BUFFER, gl.TRANSFORM_FEEDBACK_BUFFER,
gl.UNIFORM_BUFFER];
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
var testCopyBuffer = function(srcTarget, dstTarget) {
var srcTargetStr = wtu.glEnumToString(gl, srcTarget),
dstTargetStr = wtu.glEnumToString(gl, dstTarget);
var srcBuffer = gl.createBuffer(),
dstBuffer = gl.createBuffer();
var testCopyStr = "copying from a gl." + wtu.glEnumToString(gl, srcTarget) + " buffer to a gl."
+ wtu.glEnumToString(gl, dstTarget) + " buffer"
gl.bindBuffer(srcTarget, srcBuffer);
gl.bufferData(srcTarget, new Float32Array(32), gl.STATIC_DRAW);
gl.bindBuffer(dstTarget, dstBuffer);
gl.bufferData(dstTarget, new Float32Array(32), gl.STATIC_DRAW);
gl.copyBufferSubData(srcTarget, dstTarget, 8, 0, 4);
if (srcTarget == dstTarget)
wtu.glErrorShouldBe(gl, gl.NO_ERROR, testCopyStr + " should work.");
else if (srcTarget == gl.ELEMENT_ARRAY_BUFFER || dstTarget == gl.ELEMENT_ARRAY_BUFFER )
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, testCopyStr + " should fail.");
else
wtu.glErrorShouldBe(gl, gl.NO_ERROR, testCopyStr + " should work.");
// Special case: COPY_READ_BUFFER and COPY_WRITE_BUFFER are compatible with ELEMENT_ARRAY_BUFFER
// only if the buffer had been initially bound to an ELEMENT_ARRAY_BUFFER
if (srcTarget == gl.ELEMENT_ARRAY_BUFFER &&
(dstTarget == gl.COPY_READ_BUFFER || dstTarget == gl.COPY_WRITE_BUFFER)) {
dstBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, dstBuffer);
} else if (dstTarget == gl.ELEMENT_ARRAY_BUFFER &&
(srcTarget == gl.COPY_READ_BUFFER || srcTarget == gl.COPY_WRITE_BUFFER)) {
srcBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, srcBuffer);
} else {
return;
}
gl.bindBuffer(srcTarget, srcBuffer);
gl.bufferData(srcTarget, new Float32Array(32), gl.STATIC_DRAW);
gl.bindBuffer(dstTarget, dstBuffer);
gl.bufferData(dstTarget, new Float32Array(32), gl.STATIC_DRAW);
gl.copyBufferSubData(srcTarget, dstTarget, 8, 0, 4);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, testCopyStr + " should work if all buffers were initially bound to ELEMENT_ARRAY_BUFFER.");
};
for (var i = 0; i < validTargets.length; i++) {
debug("");
debug("Copying data from a " + wtu.glEnumToString(gl, validTargets[i])
+ " buffer to another target");
for (var j = 0; j < validTargets.length; j++)
testCopyBuffer(validTargets[i], validTargets[j]);
}
debug("");
debug("Test copying a buffer of other data (gl.ARRAY_BUFFER) bound to gl.COPY_READ_BUFFER to a "
+ "buffer bound to gl.ELEMENT_ARRAY_BUFFER");
var srcBuffer = gl.createBuffer(), dstBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, srcBuffer);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, dstBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Float32Array(32), gl.STATIC_DRAW);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(32), gl.STATIC_DRAW);
gl.bindBuffer(gl.COPY_READ_BUFFER, srcBuffer);
gl.copyBufferSubData(gl.COPY_READ_BUFFER, gl.ELEMENT_ARRAY_BUFFER, 0, 0, 4);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Copying gl.ARRAY_BUFFER bound to "
+ "gl.COPY_READ_BUFFER to a buffer bound to gl.ELEMENT_ARRAY_BUFFER should fail.");
finishTest();
var successfullyParsed = true;
</script>
</body>
</html>
|
