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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 out of bounds uniform array access.</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 style="background: #666;">
<div id="description"></div>
<div id="console"></div>
<div>elem mult: <span id="elemMultDisplay"></span></div>
<input type="range" id="elemMult" value="4" min="0" max="2048" style="width: 100%;"/>
<div>line width: <span id="lineWidthDisplay"></span></div>
<input type="range" id="lineWidth" value="512" min="0" max="2540" style="width: 100%;"/>
<canvas id="example" width="256" height="256" style="background: black;">
</canvas>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
varying vec4 v_color;
uniform float lineWidth;
uniform int elemMult;
uniform vec4 someArray[2];
void main()
{
vec2 texcoord = vec2(vPosition.xy * 0.5 + vec2(0.5, 0.5));
int index = int(texcoord.x + texcoord.y * lineWidth) * elemMult;
v_color = someArray[index];
gl_Position = vPosition;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 v_color;
void main()
{
gl_FragColor = v_color * vec4(1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0) + vec4(0,0,0,0.5);
}
</script>
<script>
"use strict";
window.onload = main;
debug("Tests a WebGL program that accesses out of bounds uniform array elements");
function main() {
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example");
var program = wtu.setupProgram(
gl,
['vshader', 'fshader'],
['vPosition'], [0]);
var gridRes = 255;
wtu.setupIndexedQuad(gl, gridRes, 0);
var lineWidthLoc = gl.getUniformLocation(program, "lineWidth");
var elemMultLoc = gl.getUniformLocation(program, "elemMult");
assertMsg(gl.getError() == gl.NO_ERROR, "Should be no errors from setup.");
var lineWidth = 512;
var lineWidthElem = document.getElementById("lineWidth");
var lineWidthDisplayElem = document.getElementById("lineWidthDisplay");
lineWidthElem.value = lineWidth;
lineWidthElem.addEventListener('change', function(event) {
//console.log(event.target.value);
lineWidth = event.target.value;
draw();
}, false);
var elemMult = 4;
var elemMultElem = document.getElementById("elemMult");
var elemMultDisplayElem = document.getElementById("elemMultDisplay");
elemMultElem.value = elemMult;
elemMultElem.addEventListener('change', function(event) {
//console.log(event.target.value);
elemMult = event.target.value;
draw();
}, false);
draw();
function draw() {
lineWidthDisplayElem.innerText = lineWidth;
elemMultDisplayElem.innerText = elemMult;
gl.uniform1f(lineWidthLoc, lineWidth);
gl.uniform1i(elemMultLoc, elemMult);
gl.drawElements(gl.TRIANGLES, gridRes * gridRes * 6, gl.UNSIGNED_SHORT, 0);
}
var successfullyParsed = true;
}
</script>
</body>
</html>
|
