LayoutTests/webgl/1.0.3/resources/webgl_test_files/conformance/programs/use-program-crash-with-discard-in-fragment-shader.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2012 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.
 */

 -->

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL Program Conformance Tests</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../resources/js-test-pre.js"></script>
 <script src="../resources/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="vertexShader" language="x-shader/x-vertex">
 attribute vec4 ATTR0;
 void main()
 {
   gl_Position = ATTR0;
 }
 </script>
 <script id="fragmentShader" language="x-shader/x-fragment">
 precision mediump float;
 void main()
 {
   float _Intensity = exp2(gl_FragCoord.w);
   if (_Intensity < 0.5) {
     discard;
   }
   gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
 }
 </script>
 <script>
 "use strict";
 description('Regression test for crash in Mac OS AMD OpenGL driver related to use of discard in fragment shader.<br><br>More specifically, triggering the crash seems to require examination of gl_FragCoord.w, use of exp2, and a call to discard in the fragment shader. Thanks to Sheheryar Zakaria and Michael Braithwaite at Turbulenz for the original test case.<br><a href="https://bugs.webkit.org/show_bug.cgi?id=73932">WebKit bug 73932</a><br>');

 debug("");

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

 debug("");

 var program = wtu.loadProgramFromScript(gl, 'vertexShader', 'fragmentShader');
 if (program) {
   testPassed("Program linked successfully");
 } else {
   testFailed("Program failed to link");
 }

 // Crash occurs here on affected machines
 gl.useProgram(program);

 // In some browsers, such as Chrome, the above crash only causes a
 // lost context event to be dispatched, and not synchronously. To verify
 // that everything worked, clear and read back the frame buffer.
 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 gl.clear(gl.COLOR_BUFFER_BIT);
 wtu.checkCanvasRect(gl, 0, 0, 1, 1, [255, 0, 0, 255],
     "Color should be red");

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

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

	/*
	** Copyright (c) 2012 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.
	*/

	-->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>WebGL Program Conformance Tests</title>
	<link rel="stylesheet" href="../../resources/js-test-style.css"/>
	<script src="../../resources/js-test-pre.js"></script>
	<script src="../resources/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="vertexShader" language="x-shader/x-vertex">
	attribute vec4 ATTR0;
	void main()
	{
	gl_Position = ATTR0;
	}
	</script>
	<script id="fragmentShader" language="x-shader/x-fragment">
	precision mediump float;
	void main()
	{
	float _Intensity = exp2(gl_FragCoord.w);
	if (_Intensity < 0.5) {
	discard;
	}
	gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
	}
	</script>
	<script>
	"use strict";
	description('Regression test for crash in Mac OS AMD OpenGL driver related to use of discard in fragment shader.<br><br>More specifically, triggering the crash seems to require examination of gl_FragCoord.w, use of exp2, and a call to discard in the fragment shader. Thanks to Sheheryar Zakaria and Michael Braithwaite at Turbulenz for the original test case.<br><a href="https://bugs.webkit.org/show_bug.cgi?id=73932">WebKit bug 73932</a><br>');

	debug("");

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

	debug("");

	var program = wtu.loadProgramFromScript(gl, 'vertexShader', 'fragmentShader');
	if (program) {
	testPassed("Program linked successfully");
	} else {
	testFailed("Program failed to link");
	}

	// Crash occurs here on affected machines
	gl.useProgram(program);

	// In some browsers, such as Chrome, the above crash only causes a
	// lost context event to be dispatched, and not synchronously. To verify
	// that everything worked, clear and read back the frame buffer.
	gl.clearColor(1.0, 0.0, 0.0, 1.0);
	gl.clear(gl.COLOR_BUFFER_BIT);
	wtu.checkCanvasRect(gl, 0, 0, 1, 1, [255, 0, 0, 255],
	"Color should be red");

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

	</body>
	</html>