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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 uniform unused array elements get truncated Conformance 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>
<canvas id="example" width="2" height="2"> </canvas>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 a_position;
void main()
{
gl_Position = a_position;
}
</script>
<script id="fshader-max" type="x-shader/x-fragment">
precision mediump float;
uniform vec4 colora[$(numUniformVectors)];
void main()
{
gl_FragColor = vec4(colora[$(usedUniformVector)]);
}
</script>
<script>
"use strict";
description();
debug("");
var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example");
var vSrc = wtu.getScript("vshader");
var uniforms;
// This test is to test drivers the have bugs related to optimizing
// an array of uniforms when only 1 of those uniforms is used.
debug("");
var maxUniformVectors = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS);
var tests = [
{ desc: "using 5th element",
maxUniformVectors: maxUniformVectors,
numUniformVectors: maxUniformVectors * 2,
usedUniformVector: 5,
shader: "fshader-max",
color: [0, 1, 0, 1],
arrayName: "colora",
},
];
// According to the spec unused array elements must be truncated.
var requiredUniformLocationsExist;
function testUniformIssues(testIndex) {
var test = tests[testIndex];
debug("");
debug(test.desc);
var fSrc = test.source;
if (!fSrc) {
fSrc = wtu.replaceParams(wtu.getScript(test.shader), test);
}
var consoleElem = document.getElementById("console");
wtu.addShaderSource(
consoleElem, "vertex shader", vSrc);
wtu.addShaderSource(
consoleElem, "fragment shader", fSrc);
var program = wtu.loadProgram(gl, vSrc, fSrc);
gl.useProgram(program);
uniforms = wtu.getUniformMap(gl, program);
shouldBe('uniforms["' + test.arrayName + '[0]"].size', (test.usedUniformVector + 1).toString());
requiredUniformLocationsExist = true;
for (var ii = 0; ii <= test.usedUniformVector + 1; ++ii) {
var name = test.arrayName + "[" + ii + "]";
var colorLocation = gl.getUniformLocation(program, name);
if (ii <= test.usedUniformVector) {
if (!colorLocation) {
requiredUniformLocationsExist = false
}
} else {
if (colorLocation) {
testFailed("uniform array was not truncated as specified in OpenGL ES 2.0.25 section 2.10.4");
}
}
}
shouldBeTrue("requiredUniformLocationsExist");
}
var testIndex = 0;
function runNextTest() {
testUniformIssues(testIndex++);
if (testIndex < tests.length) {
setTimeout(runNextTest, 0);
} else {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
debug("");
finishTest();
}
}
runNextTest();
var successfullyParsed = true;
</script>
</body>
</html>