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Copyright (c) 2019 The Khronos Group Inc.
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<html>
<head>
<meta charset="utf-8">
<title>GLSL unary minus operator with float bug Tests</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>
<script src="../../../js/glsl-conformance-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
void main () {
    float f = -1.0;
    // atan(tan(0.5), -f) is in range [1.5707, 1.5708) on Mac OSX 10.11 with Intel GPU.
    // But it should be 0.5.
    gl_FragColor = vec4(atan(tan(0.5), -f), 0.0, 0.0, 1.0);
}
</script>
<script>
"use strict";
description("Test for unary minus operator with float bug on MacOSX 10.11 with Intel GPU");
debug("This is a regression test for <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=308366'>Chromium Issue 308366</a>");
debug("");

GLSLConformanceTester.runRenderTests([
{
  fShaderId: 'fshader',
  fShaderSuccess: true,
  linkSuccess: true,
  passMsg: "Evaluate unary minus operator and atan(x, y)",
  renderTolerance: 3,
  renderColor: [127, 0, 0, 255]
}
]);

</script>

</body>
</html>
