LayoutTests/webgl/2.0.0/resources/webgl_test_files/conformance/extensions/ext-shader-texture-lod.html - WebKit - Git at Google

 <!--

 /*
 ** Copyright (c) 2014 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 EXT_shader_texture_lod Conformance Tests</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../js/desktop-gl-constants.js"></script>
 <script src="../../js/js-test-pre.js"></script>
 <script src="../../js/webgl-test-utils.js"></script>
 </head>
 <body>
 <div id="description"></div>
 <canvas id="canvas" style="width: 256px; height: 256px;"> </canvas>
 <canvas id="canvas2" style="width: 256px; height: 256px;"> </canvas>
 <div id="console"></div>
 <!-- Shaders for testing texture LOD functions -->

 <!-- Shader omitting the required #extension pragma -->
 <script id="missingPragmaFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 varying vec2 texCoord0v;
 uniform float lod;
 uniform sampler2D tex;
 void main() {
     vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
     gl_FragColor = color;
 }
 </script>

 <!-- Shader to test macro definition -->
 <script id="macroFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 void main() {
 #ifdef GL_EXT_shader_texture_lod
     gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
 #else
     // Error expected
     #error no GL_EXT_shader_texture_lod;
 #endif
 }
 </script>

 <!-- Shader with required #extension pragma -->
 <script id="testFragmentShader" type="x-shader/x-fragment">
 #extension GL_EXT_shader_texture_lod : enable
 precision mediump float;
 varying vec2 texCoord0v;
 uniform float lod;
 uniform sampler2D tex;
 void main() {
     vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
     gl_FragColor = color;
 }
 </script>

 <!-- Shaders to link with test fragment shaders -->
 <script id="goodVertexShader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 attribute vec2 texCoord0;
 varying vec2 texCoord0v;
 void main() {
     texCoord0v = texCoord0;
     gl_Position = vPosition;
 }
 </script>

 <!-- Shaders to test output -->
 <script id="outputVertexShader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 attribute vec2 texCoord0;
 varying vec2 texCoord0v;
 void main() {
     texCoord0v = texCoord0;
     gl_Position = vPosition;
 }
 </script>
 <script id="outputFragmentShader" type="x-shader/x-fragment">
 #extension GL_EXT_shader_texture_lod : require
 precision mediump float;
 varying vec2 texCoord0v;
 uniform float lod;
 uniform sampler2D tex;
 void main() {
     vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
     gl_FragColor = color;
 }
 </script>

 <script>
 description("This test verifies the functionality of the EXT_shader_texture_lod extension, if it is available.");

 debug("");

 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("canvas");
 var gl = wtu.create3DContext(canvas);
 var ext = null;

 // Run all tests once.
 runAllTests();

 // Run all tests against with a new context to test for any cache issues.
 debug("");
 debug("Testing new context to catch cache errors");
 var canvas2 = document.getElementById("canvas2");
 gl = wtu.create3DContext(canvas2);
 ext = null;
 runAllTests();

 function runAllTests() {
     if (!gl) {
         testFailed("WebGL context does not exist");
     } else {
         testPassed("WebGL context exists");

         // Run tests with extension disabled
         runShaderTests(false);

         // Query the extension and store globally so shouldBe can access it
         ext = gl.getExtension("EXT_shader_texture_lod");
         if (!ext) {
             testPassed("No EXT_shader_texture_lod support -- this is legal");

             runSupportedTest(false);
         } else {
             testPassed("Successfully enabled EXT_shader_texture_lod extension");

             runSupportedTest(true);

             runShaderTests(true);
             runOutputTests();
             runUniqueObjectTest();
             runReferenceCycleTest();

             // Run deferred link tests.
             runDeferredLinkTests();
         }
     }

 }

 function runSupportedTest(extensionEnabled) {
     var supported = gl.getSupportedExtensions();
     if (supported.indexOf("EXT_shader_texture_lod") >= 0) {
         if (extensionEnabled) {
             testPassed("EXT_shader_texture_lod listed as supported and getExtension succeeded");
         } else {
             testFailed("EXT_shader_texture_lod listed as supported but getExtension failed");
         }
     } else {
         if (extensionEnabled) {
             testFailed("EXT_shader_texture_lod not listed as supported but getExtension succeeded");
         } else {
             testPassed("EXT_shader_texture_lod not listed as supported and getExtension failed -- this is legal");
         }
     }
 }

 function runShaderTests(extensionEnabled) {
     debug("");
     debug("Testing various shader compiles with extension " + (extensionEnabled ? "enabled" : "disabled"));

     // Expect the macro shader to succeed ONLY if enabled
     var macroFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "macroFragmentShader");
     if (extensionEnabled) {
         if (macroFragmentProgram) {
             // Expected result
             testPassed("GL_EXT_shader_texture_lod defined in shaders when extension is enabled");
         } else {
             testFailed("GL_EXT_shader_texture_lod not defined in shaders when extension is enabled");
         }
     } else {
         if (macroFragmentProgram) {
             testFailed("GL_EXT_shader_texture_lod defined in shaders when extension is disabled");
         } else {
             testPassed("GL_EXT_shader_texture_lod not defined in shaders when extension disabled");
         }
     }

     // Always expect the shader missing the #pragma to fail (whether enabled or not)
     var missingPragmaFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "missingPragmaFragmentShader");
     if (missingPragmaFragmentProgram) {
         testFailed("Shader built-ins allowed without #extension pragma");
     } else {
         testPassed("Shader built-ins disallowed without #extension pragma");
     }

     // Try to compile a shader using the built-ins that should only succeed if enabled
     var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "testFragmentShader");
     if (extensionEnabled) {
         if (testFragmentProgram) {
             testPassed("Shader built-ins compiled successfully when extension enabled");
         } else {
             testFailed("Shader built-ins failed to compile when extension enabled");
         }
     } else {
         if (testFragmentProgram) {
             testFailed("Shader built-ins compiled successfully when extension disabled");
         } else {
             testPassed("Shader built-ins failed to compile when extension disabled");
         }
     }
 }

 function runOutputTests() {
     debug("");
     debug("Testing various draws for valid built-in function behavior");
     gl.viewport(0, 0, canvas.width, canvas.height);

     var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition', 'texCoord0'], [0, 1]);
     var quadParameters = wtu.setupUnitQuad(gl, 0, 1);

     var colors = [
         {name: 'red', color:[255, 0, 0, 255]},
         {name: 'green', color:[0, 255, 0, 255]},
         {name: 'blue', color:[0, 0, 255, 255]},
         {name: 'yellow', color:[255, 255, 0, 255]},
         {name: 'magenta', color:[255, 0, 255, 255]},
         {name: 'cyan', color:[0, 255, 255, 255]},
         {name: 'pink', color:[255, 128, 128, 255]},
         {name: 'gray', color:[128, 128, 128, 255]},
         {name: 'light green', color:[128, 255, 128, 255]},
     ];

     var tex = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, tex);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_LINEAR);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);

     for (var ii = 0; ii < colors.length; ++ii) {
         var color = colors[ii];
         var size = Math.pow(2, colors.length - ii - 1);
         wtu.fillTexture(gl, tex, size, size, color.color, ii);
     }

     var loc = gl.getUniformLocation(program, "lod");

     for (var ii = 0; ii < colors.length; ++ii) {
         gl.uniform1f(loc, ii);
         var color = colors[ii];
         wtu.drawUnitQuad(gl);
         wtu.checkCanvas(
             gl, color.color,
             "256x256 texture drawn to 256x256 dest with lod = " + ii +
             " should be " + color.name);
     }

     wtu.glErrorShouldBe(gl, gl.NO_ERROR);
 }

 function runUniqueObjectTest()
 {
     debug("");
     debug("Testing that getExtension() returns the same object each time");
     ext = null;
     gl.getExtension("EXT_shader_texture_lod").myProperty = 2;
     webglHarnessCollectGarbage();
     shouldBe('gl.getExtension("EXT_shader_texture_lod").myProperty', '2');
 }

 function runReferenceCycleTest()
 {
     // create some reference cycles. The goal is to see if they cause leaks. The point is that
     // some browser test runners have instrumentation to detect leaked refcounted objects.
     debug("");
     debug("Testing reference cycles between context and extension objects");
     var ext = gl.getExtension("EXT_shader_texture_lod");

     // create cycle between extension and context, since the context has to hold a reference to the extension
     ext.context = gl;

     // create a self-cycle on the extension object
     ext.ext = ext;
 }

 function runDeferredLinkTests() {
     debug("");
     debug("Testing deferred shader compilation tests.");

     // Test for compilation failures that are caused by missing extensions
     // do not succeed if extensions are enabled during linking. This would
     // only happen for deferred shader compilations.

     // First test if link succeeds with extension enabled.
     var glEnabled = wtu.create3DContext();
     var extEnabled = glEnabled.getExtension("EXT_shader_texture_lod");
     if (!extEnabled) {
         testFailed("Deferred link test expects the extension to be supported");
     }

     var vertexShader = wtu.loadShaderFromScript(glEnabled, "goodVertexShader");
     var fragmentShader = wtu.loadShaderFromScript(glEnabled, "macroFragmentShader");

     if (!vertexShader || !fragmentShader) {
         testFailed("Could not create good shaders.");
         return;
     }

     var program = wtu.setupProgram(glEnabled, [vertexShader, fragmentShader]);

     if (!program) {
         testFailed("Compilation with extension enabled failed.");
         return;
     }

     // Create new context to test link failure without extension enabled.
     var glDeferred = wtu.create3DContext();

     var vertexShader = wtu.loadShaderFromScript(glDeferred, "goodVertexShader", glDeferred.VERTEX_SHADER, undefined, undefined, true);
     var fragmentShader = wtu.loadShaderFromScript(glDeferred, "macroFragmentShader", glDeferred.FRAGMENT_SHADER, undefined, undefined, true);

     if (vertexShader == null || fragmentShader == null) {
         testFailed("Could not create shaders.");
         return;
     }

     // Shader compilations should have failed due to extensions not enabled.
     glDeferred.getExtension("EXT_shader_texture_lod");
     var program = wtu.setupProgram(glDeferred, [vertexShader, fragmentShader]);
     if (program) {
         testFailed("Compilation with extension disabled then linking with extension enabled should have failed.");
         return;
     }

     testPassed("Compilation with extension disabled then linking with extension enabled.");
 }

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

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

	/*
	** Copyright (c) 2014 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 EXT_shader_texture_lod Conformance Tests</title>
	<link rel="stylesheet" href="../../resources/js-test-style.css"/>
	<script src="../../js/desktop-gl-constants.js"></script>
	<script src="../../js/js-test-pre.js"></script>
	<script src="../../js/webgl-test-utils.js"></script>
	</head>
	<body>
	<div id="description"></div>
	<canvas id="canvas" style="width: 256px; height: 256px;"> </canvas>
	<canvas id="canvas2" style="width: 256px; height: 256px;"> </canvas>
	<div id="console"></div>
	<!-- Shaders for testing texture LOD functions -->

	<!-- Shader omitting the required #extension pragma -->
	<script id="missingPragmaFragmentShader" type="x-shader/x-fragment">
	precision mediump float;
	varying vec2 texCoord0v;
	uniform float lod;
	uniform sampler2D tex;
	void main() {
	vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
	gl_FragColor = color;
	}
	</script>

	<!-- Shader to test macro definition -->
	<script id="macroFragmentShader" type="x-shader/x-fragment">
	precision mediump float;
	void main() {
	#ifdef GL_EXT_shader_texture_lod
	gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
	#else
	// Error expected
	#error no GL_EXT_shader_texture_lod;
	#endif
	}
	</script>

	<!-- Shader with required #extension pragma -->
	<script id="testFragmentShader" type="x-shader/x-fragment">
	#extension GL_EXT_shader_texture_lod : enable
	precision mediump float;
	varying vec2 texCoord0v;
	uniform float lod;
	uniform sampler2D tex;
	void main() {
	vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
	gl_FragColor = color;
	}
	</script>

	<!-- Shaders to link with test fragment shaders -->
	<script id="goodVertexShader" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	attribute vec2 texCoord0;
	varying vec2 texCoord0v;
	void main() {
	texCoord0v = texCoord0;
	gl_Position = vPosition;
	}
	</script>

	<!-- Shaders to test output -->
	<script id="outputVertexShader" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	attribute vec2 texCoord0;
	varying vec2 texCoord0v;
	void main() {
	texCoord0v = texCoord0;
	gl_Position = vPosition;
	}
	</script>
	<script id="outputFragmentShader" type="x-shader/x-fragment">
	#extension GL_EXT_shader_texture_lod : require
	precision mediump float;
	varying vec2 texCoord0v;
	uniform float lod;
	uniform sampler2D tex;
	void main() {
	vec4 color = texture2DLodEXT(tex, texCoord0v, lod);
	gl_FragColor = color;
	}
	</script>

	<script>
	description("This test verifies the functionality of the EXT_shader_texture_lod extension, if it is available.");

	debug("");

	var wtu = WebGLTestUtils;
	var canvas = document.getElementById("canvas");
	var gl = wtu.create3DContext(canvas);
	var ext = null;

	// Run all tests once.
	runAllTests();

	// Run all tests against with a new context to test for any cache issues.
	debug("");
	debug("Testing new context to catch cache errors");
	var canvas2 = document.getElementById("canvas2");
	gl = wtu.create3DContext(canvas2);
	ext = null;
	runAllTests();

	function runAllTests() {
	if (!gl) {
	testFailed("WebGL context does not exist");
	} else {
	testPassed("WebGL context exists");

	// Run tests with extension disabled
	runShaderTests(false);

	// Query the extension and store globally so shouldBe can access it
	ext = gl.getExtension("EXT_shader_texture_lod");
	if (!ext) {
	testPassed("No EXT_shader_texture_lod support -- this is legal");

	runSupportedTest(false);
	} else {
	testPassed("Successfully enabled EXT_shader_texture_lod extension");

	runSupportedTest(true);

	runShaderTests(true);
	runOutputTests();
	runUniqueObjectTest();
	runReferenceCycleTest();

	// Run deferred link tests.
	runDeferredLinkTests();
	}
	}

	}

	function runSupportedTest(extensionEnabled) {
	var supported = gl.getSupportedExtensions();
	if (supported.indexOf("EXT_shader_texture_lod") >= 0) {
	if (extensionEnabled) {
	testPassed("EXT_shader_texture_lod listed as supported and getExtension succeeded");
	} else {
	testFailed("EXT_shader_texture_lod listed as supported but getExtension failed");
	}
	} else {
	if (extensionEnabled) {
	testFailed("EXT_shader_texture_lod not listed as supported but getExtension succeeded");
	} else {
	testPassed("EXT_shader_texture_lod not listed as supported and getExtension failed -- this is legal");
	}
	}
	}

	function runShaderTests(extensionEnabled) {
	debug("");
	debug("Testing various shader compiles with extension " + (extensionEnabled ? "enabled" : "disabled"));

	// Expect the macro shader to succeed ONLY if enabled
	var macroFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "macroFragmentShader");
	if (extensionEnabled) {
	if (macroFragmentProgram) {
	// Expected result
	testPassed("GL_EXT_shader_texture_lod defined in shaders when extension is enabled");
	} else {
	testFailed("GL_EXT_shader_texture_lod not defined in shaders when extension is enabled");
	}
	} else {
	if (macroFragmentProgram) {
	testFailed("GL_EXT_shader_texture_lod defined in shaders when extension is disabled");
	} else {
	testPassed("GL_EXT_shader_texture_lod not defined in shaders when extension disabled");
	}
	}

	// Always expect the shader missing the #pragma to fail (whether enabled or not)
	var missingPragmaFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "missingPragmaFragmentShader");
	if (missingPragmaFragmentProgram) {
	testFailed("Shader built-ins allowed without #extension pragma");
	} else {
	testPassed("Shader built-ins disallowed without #extension pragma");
	}

	// Try to compile a shader using the built-ins that should only succeed if enabled
	var testFragmentProgram = wtu.loadProgramFromScriptExpectError(gl, "goodVertexShader", "testFragmentShader");
	if (extensionEnabled) {
	if (testFragmentProgram) {
	testPassed("Shader built-ins compiled successfully when extension enabled");
	} else {
	testFailed("Shader built-ins failed to compile when extension enabled");
	}
	} else {
	if (testFragmentProgram) {
	testFailed("Shader built-ins compiled successfully when extension disabled");
	} else {
	testPassed("Shader built-ins failed to compile when extension disabled");
	}
	}
	}

	function runOutputTests() {
	debug("");
	debug("Testing various draws for valid built-in function behavior");
	gl.viewport(0, 0, canvas.width, canvas.height);

	var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition', 'texCoord0'], [0, 1]);
	var quadParameters = wtu.setupUnitQuad(gl, 0, 1);

	var colors = [
	{name: 'red', color:[255, 0, 0, 255]},
	{name: 'green', color:[0, 255, 0, 255]},
	{name: 'blue', color:[0, 0, 255, 255]},
	{name: 'yellow', color:[255, 255, 0, 255]},
	{name: 'magenta', color:[255, 0, 255, 255]},
	{name: 'cyan', color:[0, 255, 255, 255]},
	{name: 'pink', color:[255, 128, 128, 255]},
	{name: 'gray', color:[128, 128, 128, 255]},
	{name: 'light green', color:[128, 255, 128, 255]},
	];

	var tex = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D, tex);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_LINEAR);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);

	for (var ii = 0; ii < colors.length; ++ii) {
	var color = colors[ii];
	var size = Math.pow(2, colors.length - ii - 1);
	wtu.fillTexture(gl, tex, size, size, color.color, ii);
	}

	var loc = gl.getUniformLocation(program, "lod");

	for (var ii = 0; ii < colors.length; ++ii) {
	gl.uniform1f(loc, ii);
	var color = colors[ii];
	wtu.drawUnitQuad(gl);
	wtu.checkCanvas(
	gl, color.color,
	"256x256 texture drawn to 256x256 dest with lod = " + ii +
	" should be " + color.name);
	}

	wtu.glErrorShouldBe(gl, gl.NO_ERROR);
	}

	function runUniqueObjectTest()
	{
	debug("");
	debug("Testing that getExtension() returns the same object each time");
	ext = null;
	gl.getExtension("EXT_shader_texture_lod").myProperty = 2;
	webglHarnessCollectGarbage();
	shouldBe('gl.getExtension("EXT_shader_texture_lod").myProperty', '2');
	}

	function runReferenceCycleTest()
	{
	// create some reference cycles. The goal is to see if they cause leaks. The point is that
	// some browser test runners have instrumentation to detect leaked refcounted objects.
	debug("");
	debug("Testing reference cycles between context and extension objects");
	var ext = gl.getExtension("EXT_shader_texture_lod");

	// create cycle between extension and context, since the context has to hold a reference to the extension
	ext.context = gl;

	// create a self-cycle on the extension object
	ext.ext = ext;
	}

	function runDeferredLinkTests() {
	debug("");
	debug("Testing deferred shader compilation tests.");

	// Test for compilation failures that are caused by missing extensions
	// do not succeed if extensions are enabled during linking. This would
	// only happen for deferred shader compilations.

	// First test if link succeeds with extension enabled.
	var glEnabled = wtu.create3DContext();
	var extEnabled = glEnabled.getExtension("EXT_shader_texture_lod");
	if (!extEnabled) {
	testFailed("Deferred link test expects the extension to be supported");
	}

	var vertexShader = wtu.loadShaderFromScript(glEnabled, "goodVertexShader");
	var fragmentShader = wtu.loadShaderFromScript(glEnabled, "macroFragmentShader");

	if (!vertexShader \|\| !fragmentShader) {
	testFailed("Could not create good shaders.");
	return;
	}

	var program = wtu.setupProgram(glEnabled, [vertexShader, fragmentShader]);

	if (!program) {
	testFailed("Compilation with extension enabled failed.");
	return;
	}

	// Create new context to test link failure without extension enabled.
	var glDeferred = wtu.create3DContext();

	var vertexShader = wtu.loadShaderFromScript(glDeferred, "goodVertexShader", glDeferred.VERTEX_SHADER, undefined, undefined, true);
	var fragmentShader = wtu.loadShaderFromScript(glDeferred, "macroFragmentShader", glDeferred.FRAGMENT_SHADER, undefined, undefined, true);

	if (vertexShader == null \|\| fragmentShader == null) {
	testFailed("Could not create shaders.");
	return;
	}

	// Shader compilations should have failed due to extensions not enabled.
	glDeferred.getExtension("EXT_shader_texture_lod");
	var program = wtu.setupProgram(glDeferred, [vertexShader, fragmentShader]);
	if (program) {
	testFailed("Compilation with extension disabled then linking with extension enabled should have failed.");
	return;
	}

	testPassed("Compilation with extension disabled then linking with extension enabled.");
	}

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

	</body>
	</html>