<!--
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 Unknown Uniform 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="canvas" width="2" height="2"> </canvas>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
    gl_Position = vPosition;
}
</script>

<script id="fshader" type="x-shader/x-fragment">
void main()
{
    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
}
</script>
<script>
"use strict";
description("Tests that unknown uniforms don't cause errors.");

debug("");
debug("Canvas.getContext");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("canvas");
if (!gl) {
  testFailed("context does not exist");
} else {
  testPassed("context exists");

  debug("");

  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
  // Get the location of an unknown uniform.
  var loc = gl.getUniformLocation(program, "someUnknownUniform");
  assertMsg(loc === null, "location of unknown uniform should be null");
  wtu.glErrorShouldBe(gl, gl.NO_ERROR,
      "there should be no error from getting an unknown uniform");
  gl.uniform1f(loc, 1);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR,
      "there should be no error from trying to set an unknown uniform");
}

debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>

</body>
</html>
