LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/glsl/bugs/floored-division-accuracy.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2013 The Khronos Group Inc.
 **
 ** Permission is hereby granted, free of charge, to any person obtaining a
 ** copy of this software and/or associated documentation files (the
 ** "Materials"), to deal in the Materials without restriction, including
 ** without limitation the rights to use, copy, modify, merge, publish,
 ** distribute, sublicense, and/or sell copies of the Materials, and to
 ** permit persons to whom the Materials are furnished to do so, subject to
 ** the following conditions:
 **
 ** The above copyright notice and this permission notice shall be included
 ** in all copies or substantial portions of the Materials.
 **
 ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
 */

 -->

 <!-- author: Bill Baxter (wbaxter at google.com) -->

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>Floored Division Accuracy Bug</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="shader-vs" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 uniform float divisor;
 varying vec4 vColor;
 void main(void) {
   gl_Position = vPosition;
   float index = 9.0;
   // Floating point operations don't have any guaranteed precision, but they
   // should at least be accurate to 1 part in 10^5.
   float value = floor((index / divisor) * 1.00001);
   vColor = (value == 3.) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
 }
 </script>

 <script id="shader-fs" type="x-shader/x-fragment">
 precision mediump float;
 varying vec4 vColor;
 void main(void) {
   gl_FragColor = vColor;
 }
 </script>
 <script>
 "use strict";
 description();

 debug("");
 // Reproduces bug seen on Mac OS X with AMD Radeon HD 6490 GPU
 debug("If things are working correctly, then the square will be green.");
 debug("If your card thinks floor(9. / 3.) is not 3 to within 1 part in 10^5, ");
 debug("then the square will be red.");

 GLSLConformanceTester.runRenderTests([
 {
   vShaderId: 'shader-vs',
   vShaderSuccess: true,
   fShaderId: 'shader-fs',
   fShaderSuccess: true,
   linkSuccess: true,
   passMsg: 'Test that floor(9. / 3.) is 3 to within 1 part in 10^5',
   uniforms: [{name: "divisor", functionName: "uniform1f", value: 3}]
 }
 ]);

 </script>
 </body>
 </html>
	<!--

	/*
	** Copyright (c) 2013 The Khronos Group Inc.
	**
	** Permission is hereby granted, free of charge, to any person obtaining a
	** copy of this software and/or associated documentation files (the
	** "Materials"), to deal in the Materials without restriction, including
	** without limitation the rights to use, copy, modify, merge, publish,
	** distribute, sublicense, and/or sell copies of the Materials, and to
	** permit persons to whom the Materials are furnished to do so, subject to
	** the following conditions:
	**
	** The above copyright notice and this permission notice shall be included
	** in all copies or substantial portions of the Materials.
	**
	** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
	** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
	*/

	-->

	<!-- author: Bill Baxter (wbaxter at google.com) -->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Floored Division Accuracy Bug</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="shader-vs" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	uniform float divisor;
	varying vec4 vColor;
	void main(void) {
	gl_Position = vPosition;
	float index = 9.0;
	// Floating point operations don't have any guaranteed precision, but they
	// should at least be accurate to 1 part in 10^5.
	float value = floor((index / divisor) * 1.00001);
	vColor = (value == 3.) ? vec4(0, 1, 0, 1) : vec4(1, 0, 0, 1);
	}
	</script>

	<script id="shader-fs" type="x-shader/x-fragment">
	precision mediump float;
	varying vec4 vColor;
	void main(void) {
	gl_FragColor = vColor;
	}
	</script>
	<script>
	"use strict";
	description();

	debug("");
	// Reproduces bug seen on Mac OS X with AMD Radeon HD 6490 GPU
	debug("If things are working correctly, then the square will be green.");
	debug("If your card thinks floor(9. / 3.) is not 3 to within 1 part in 10^5, ");
	debug("then the square will be red.");

	GLSLConformanceTester.runRenderTests([
	{
	vShaderId: 'shader-vs',
	vShaderSuccess: true,
	fShaderId: 'shader-fs',
	fShaderSuccess: true,
	linkSuccess: true,
	passMsg: 'Test that floor(9. / 3.) is 3 to within 1 part in 10^5',
	uniforms: [{name: "divisor", functionName: "uniform1f", value: 3}]
	}
	]);

	</script>
	</body>
	</html>