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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 GLSL Conformance Tests</title>
<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
<link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/>
<script src="../../../js/js-test-pre.js"></script>
<script src="../../../js/webgl-test-utils.js"></script>
<script src="../../../js/glsl-conformance-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script id="fragmentShader" type="text/something-not-javascript">
// fragment shader should succeed
precision mediump float;
uniform vec4 foo;
void main()
{
gl_FragColor = foo;
}
</script>
<script id="vertexShader" type="text/something-not-javascript">
// vertex shader should succeed
attribute vec4 foo;
void main()
{
gl_Position = foo;
}
</script>
<script>
"use strict";
/*
This test previously concluded that an attribute in a vertex shader
would conflict across shaders with a uniform of the same name in the
fragment shader, based on the following sections of the GLSL ES 1.0.17
specification:
---
Section 4.2.6
...
With the exception of uniform declarations, vertex and fragment shaders
have separate name spaces. Functions and global variables declared in a
vertex shader cannot be referenced by a fragment shader and vice versa.
Uniforms have a single name space. Uniforms declared with the same name
must have matching types and precisions.
Section 4.3.3
Attribute variables are required to have global scope
Section 4.3.4
The uniform qualifier is used to declare global variables
---
GLSL ES 3.00 later confirmed that pipeline stages have distinct
namespaces. The OpenGL ES working group confirmed in discussions
https://github.com/KhronosGroup/WebGL/issues/3201 that this was the
intended behavior for GLSL ES 1.00.
For this reason, this test asserts that such usage does not generate a
conflict.
*/
GLSLConformanceTester.runTests([
{ vShaderId: 'vertexShader',
vShaderSuccess: true,
fShaderId: 'fragmentShader',
fShaderSuccess: true,
linkSuccess: true,
passMsg: 'using the same name for a vertex shader attribute and fragment shader uniform should succeed'
},
]);
var successfullyParsed = true;
</script>
</body>
</html>
|
