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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 getBufferSubData 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("This test makes sure that getBufferSubData acts as expected governed by WebGL 2.");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext(undefined, undefined, 2);
var vertices = [
1.1, 1.0, 1.3,
-1.0, -1.0, -5.0,
5.3, -1.0, 1.0
];
var floatArray = new Float32Array(vertices);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, floatArray, gl.STATIC_DRAW);
var uninitializedBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, uninitializedBuffer);
gl.bufferData(gl.ARRAY_BUFFER, 36, gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from buffer setup.");
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
debug("");
debug("Test that getBufferSubData successfully works reading buffer data from gl.ARRAY_BUFFER");
var retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray)");
debug("Argument must be ArrayBufferView, not ArrayBuffer")
shouldThrow("gl.getBufferSubData(gl.ARRAY_BUFFER, 0, new ArrayBuffer(4))");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should not generate GL error");
debug("Argument must be ArrayBufferView, not null")
shouldThrow("gl.getBufferSubData(gl.ARRAY_BUFFER, 0, null)");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should not generate GL error");
debug("Check array data to match original data set by the buffer");
shouldBeTrue("areArraysEqual(retArray, floatArray)");
debug("Test that getBufferSubData successfully works with dstOffset");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2), floatArray.slice(0, floatArray.length - 2))");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length)");
shouldBeTrue("areArraysEqual(retArray, [0, 0, 0, 0, 0, 0, 0, 0, 0])");
debug("Test that getBufferSubData fails when given a dstOffset beyond the end of retArray");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length + 1)");
debug("Test that getBufferSubData successfully works with dstOffset and length");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, 2, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2, 4), floatArray.slice(0, 2))");
shouldBeTrue("areArraysEqual(retArray.slice(4), [0, 0, 0, 0, 0])");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length - 1, 1)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 8), [0, 0, 0, 0, 0, 0, 0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(8), floatArray.slice(0, 1))");
debug("Test that getBufferSubData fails when given a dstOffset+length beyond the end of retArray");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length - 1, 2)");
debug("Test that getBufferSubData successfully works with srcByteOffset");
retArray = new Float32Array(vertices.length - 2);
const float32Size = Float32Array.BYTES_PER_ELEMENT;
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 2*float32Size, retArray)");
shouldBeTrue("areArraysEqual(retArray, floatArray.slice(2))");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 2*float32Size, retArray, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2), floatArray.slice(2))");
retArray = new Float32Array(vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 4*float32Size, retArray, 3, 3)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 3), [0, 0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(3, 6), floatArray.slice(4, 7))");
shouldBeTrue("areArraysEqual(retArray.slice(6), [0, 0, 0])");
debug("Test that getBufferSubData fails when given a buffer with its size larger than the original data");
var extraLargeBuffer = new Float32Array(vertices.length + 1);
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE,
"gl.getBufferSubData(gl.ARRAY_BUFFER, 0, extraLargeBuffer)",
"Extra length should generate INVALID_VALUE.");
extraLargeBuffer = new Float32Array(vertices.length - 1);
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE,
"gl.getBufferSubData(gl.ARRAY_BUFFER, 2*float32Size, extraLargeBuffer)",
"Extra length should generate INVALID_VALUE.");
debug("Test that getBufferSubData fails when offset summed with buffer length is larger than the size of the original data size");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE,
"gl.getBufferSubData(gl.ARRAY_BUFFER, retArray.byteLength + 1, retArray)");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, 1, retArray)");
debug("Test that getBufferSubData successfully works with offset view into ArrayBuffer");
const verticesLengthInBytes = vertices.length * float32Size;
const retStorage = new ArrayBuffer(4* verticesLengthInBytes); // Over allocate 4x
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray)");
shouldBeTrue("areArraysEqual(retArray, floatArray)");
debug("Test that getBufferSubData successfully works with offset view into ArrayBuffer and dstOffset");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2), floatArray.slice(0, floatArray.length - 2))");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length)");
shouldBeTrue("areArraysEqual(retArray, [0, 0, 0, 0, 0, 0, 0, 0, 0])");
debug("Test that getBufferSubData fails when given a dstOffset beyond the end of offset view into ArrayBuffer");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length + 1)");
debug("Test that getBufferSubData successfully works with offset view into ArrayBuffer and dstOffset and length");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, 2, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2, 4), floatArray.slice(0, 2))");
shouldBeTrue("areArraysEqual(retArray.slice(4), [0, 0, 0, 0, 0])");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length - 1, 1)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 8), [0, 0, 0, 0, 0, 0, 0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(8), floatArray.slice(0, 1))");
debug("Test that getBufferSubData fails when given a dstOffset+length beyond the end of offset view into ArrayBuffer");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray, retArray.length - 1, 2)");
debug("Test that getBufferSubData successfully works with offset view into ArrayBuffer and srcByteOffset");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length - 2);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 2*float32Size, retArray)");
shouldBeTrue("areArraysEqual(retArray, floatArray.slice(2))");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 2*float32Size, retArray, 2)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 2), [0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(2), floatArray.slice(2))");
retArray = new Float32Array(retStorage, verticesLengthInBytes, vertices.length);
retArray.fill(0);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR, "gl.getBufferSubData(gl.ARRAY_BUFFER, 4*float32Size, retArray, 3, 3)");
shouldBeTrue("areArraysEqual(retArray.slice(0, 3), [0, 0, 0])");
shouldBeTrue("areArraysEqual(retArray.slice(3, 6), floatArray.slice(4, 7))");
shouldBeTrue("areArraysEqual(retArray.slice(6), [0, 0, 0])");
debug("Test that getBufferSubData fails when 0 is bound to the target");
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
wtu.shouldGenerateGLError(gl, gl.INVALID_OPERATION,
"gl.getBufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, retArray)");
debug("Test that getBufferSubData fails when offset is less than 0");
wtu.shouldGenerateGLError(gl, gl.INVALID_VALUE, "gl.getBufferSubData(gl.ARRAY_BUFFER, -1, retArray)");
debug("");
debug("Test that getBufferSubData successfully works with uninitialized buffers");
retArray = new Float32Array([1, 2, 3, 4, 5, 6, 7, 8, 9]);
gl.bindBuffer(gl.ARRAY_BUFFER, uninitializedBuffer);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR,
"gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray)");
shouldBeTrue("areArraysEqual(retArray, [0, 0, 0, 0, 0, 0, 0, 0, 0])");
debug("");
debug("Test that getBufferSubData works when a buffer is immediately resized to be too small");
retArray = new Float32Array([1, 2, 3, 4, 5, 6, 7, 8, 9]);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR,
"gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray)");
gl.bufferData(gl.ARRAY_BUFFER, 4, gl.STATIC_DRAW);
shouldBeTrue("areArraysEqual(retArray, floatArray)");
debug("");
debug("Test that getBufferSubData works when a buffer is immediately deleted");
retArray = new Float32Array([1, 2, 3, 4, 5, 6, 7, 8, 9]);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, floatArray, gl.STATIC_DRAW);
wtu.shouldGenerateGLError(gl, gl.NO_ERROR,
"gl.getBufferSubData(gl.ARRAY_BUFFER, 0, retArray)");
gl.deleteBuffer(buffer);
shouldBeTrue("areArraysEqual(retArray, floatArray)");
finishTest();
var successfullyParsed = true;
</script>
</body>
</html>
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