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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>Element Array Buffer Deletion and Recreation 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>
<canvas id="example" width="32" height="32"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
var wtu = WebGLTestUtils;
function init()
{
description();
// Clear the background with red.
var gl = wtu.create3DContext("example");
wtu.setupSimpleColorProgram(gl);
var color = [0, 255, 0, 255];
wtu.setUByteDrawColor(gl, color);
var vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
-1, -1,
1, -1,
-1, 1,
1, 1
]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
// Create an element array buffer.
var indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint8Array([0, 1, 2, 3]), gl.STATIC_DRAW);
// Delete the element array buffer.
gl.deleteBuffer(indexBuffer);
// Create a new element array buffer.
indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint8Array([0, 1, 2, 3]), gl.STATIC_DRAW);
// Draw with the new element array buffer.
// If the geometry is drawn successfully, the fragment shader will color it green.
gl.drawElements(gl.TRIANGLE_STRIP, 4, gl.UNSIGNED_BYTE, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no errors from draw");
wtu.checkCanvas(gl, color, "should be green")
}
init();
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
