LayoutTests/fast/canvas/webgl/oes-texture-half-float.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.
 */

 -->

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL OES_texture_half_float Conformance Tests</title>
 <script src="resources/desktop-gl-constants.js" type="text/javascript"></script>
 <script src="../../../resources/js-test.js"></script>
 <script src="resources/webgl-test.js"></script>
 <script src="resources/webgl-test-utils.js"></script></head>
 <body>
 <div id="description"></div>
 <canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
 <canvas id="canvas2d" style="width: 50px; height: 50px;"> </canvas>
 <div id="console"></div>
 <script id="testFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 uniform sampler2D tex;
 uniform vec4 subtractor;
 varying vec2 texCoord;
 void main()
 {
     vec4 color = texture2D(tex, texCoord);
     if (abs(color.r - subtractor.r) +
         abs(color.g - subtractor.g) +
         abs(color.b - subtractor.b) +
         abs(color.a - subtractor.a) < 8.0) {
         gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
     } else {
         gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
     }
 }
 </script>
 <!-- Shaders for testing half-floating-point render targets -->
 <script id="positionVertexShader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 void main()
 {
     gl_Position = vPosition;
 }
 </script>
 <script id="floatingPointFragmentShader" type="x-shader/x-fragment">
 void main()
 {
     gl_FragColor = vec4(10000.0, 10000.0, 10000.0, 10000.0);
 }
 </script>
 <script>
 if (window.testRunner)
     window.testRunner.dumpAsText();

 "use strict"
 description("This test verifies the functionality of OES_texture_half_float with null/non-null ArrayBufferView");

 debug("");
 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("canvas");
 var colorCanvas = document.getElementById("canvas2d");
 colorCanvas.width = 2;
 colorCanvas.height = 2;
 var ctx = colorCanvas.getContext("2d");
 ctx.fillStyle = "rgb(255,0,0)";
 ctx.fillRect(0, 0, 2, 2);
 var gl = wtu.create3DContext(canvas);
 // This constant must be defined in order to run the texture creation test without the extension enabled.
 var halfFloatOESEnum = 0x8D61;
 var ext = null;

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

     // Verify that allocation of texture fails if extension is not enabled
     runTextureCreationTest(false);
     ext = gl.getExtension("OES_texture_half_float")
     if (!ext) {
         testPassed("No OES_texture_half_float support. This is legal");
     } else {
         testPassed("Successfully enabled OES_texture_half_float extension");

         var program = wtu.setupTexturedQuad(gl);

         // Check if creation of texture succeed's with various formats and null ArrayBufferView
         var formats = [
           { format: gl.RGBA,            expected: [255,   0,   0, 255], },
           { format: gl.RGB,             expected: [255,   0,   0, 255], },
           { format: gl.LUMINANCE,       expected: [255, 255, 255, 255], },
           { format: gl.ALPHA,           expected: [  0,   0,   0, 255], },
           { format: gl.LUMINANCE_ALPHA, expected: [255, 255, 255, 255], },
         ];
         formats.forEach(function(f) {
             runTextureCreationTest(true, f.format, null, f.expected);
         });

         // Texture creation should fail when passed with non-null, non-Uint16 ArrayBufferView
         formats.forEach(function(f) {
             var width = 2;
             var height = 2;
             var format = f.format;

             // Float32Array
             var float32Data = new Float32Array(width * height * getNumberOfChannels(format));
             for (var ii = 0; ii < float32Data.length; ii++) {
                 float32Data[ii] = 1000;
             }
             runTextureCreationTest(true, format, float32Data, null);

             // Int16Array
             var int16Data = new Int16Array(width * height * getNumberOfChannels(format));
             for (var ii = 0; ii <  int16Data.length; ii++) {
                 int16Data[ii] = 1000;
             }
             runTextureCreationTest(true, format, int16Data, null);
         });

         // Test that Uint16 encoded half float values can be used as texture data.

         // First test that values in the 0-1 range can be written and read.
         var halfFloatOneThird = 0x3555; // Half float 1/3
         var uint16Formats = [
           { format: gl.RGBA,            expected: [85, 85, 85,  85], },
           { format: gl.RGB,             expected: [85, 85, 85, 255], },
           { format: gl.LUMINANCE,       expected: [85, 85, 85, 255], },
           { format: gl.ALPHA,           expected: [ 0,  0,  0,  85], },
           { format: gl.LUMINANCE_ALPHA, expected: [85, 85, 85,  85], },
         ];

         uint16Formats.forEach(function(f) {
             var width = 2;
             var height = 2;
             var format = f.format;

             var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
             for (var ii = 0; ii <  uint16Data.length; ii++) {
                 uint16Data[ii] = halfFloatOneThird;
             }
             runTextureCreationTest(true, format, uint16Data, f.expected);
         });

         // Next check that values outside the 0-1 range can be written.
         var halfFloatTenK = 0x70E2; // Half float 10000
         var uint16Formats2 = [
           { format: gl.RGBA, subtractor: [10000, 10000, 10000, 10000], },
           { format: gl.RGB,  subtractor: [10000, 10000, 10000, 1], },
         ];

         uint16Formats2.forEach(function(f) {
             var width = 2;
             var height = 2;
             var format = f.format;

             var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
             for (var ii = 0; ii <  uint16Data.length; ii++) {
                 uint16Data[ii] = halfFloatTenK;
             }
             runRenderTest(format, f.subtractor, uint16Data);
         });

         // Check if attaching texture as FBO target succeeds (Not mandatory)
         runRenderTest(gl.RGBA, [10000, 10000, 10000, 10000], null);
         runRenderTest(gl.RGB, [10000, 10000, 10000, 1], null);

         // Check of getExtension() returns same object
         runUniqueObjectTest();
     }
 }

 function getNumberOfChannels(format)
 {
     if (format == gl.RGBA)
         return 4;
     else if (format == gl.RGB)
         return 3;
     else if (format == gl.LUMINANCE || format == gl.ALPHA)
         return 1;
     else if (format == gl.LUMINANCE_ALPHA)
         return 2;
 }

 function getFormatName(format)
 {
     if (format == gl.RGBA)
         return "RGBA";
     else if (format == gl.RGB)
         return "RGB";
     else if (format == gl.LUMINANCE)
         return "LUMINANCE";
     else if (format == gl.ALPHA)
         return "ALPHA";
     else if (format == gl.LUMINANCE_ALPHA)
         return "LUMINANCE_ALPHA";
 }

 function allocateTexture()
 {
     var texture = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texture parameter setup should succeed");
     return texture;
 }

 function runTextureCreationTest(extensionEnabled, opt_format, opt_data, opt_expected)
 {
     var format = opt_format || gl.RGBA;
     var data = opt_data || null;
     var expectSuccess = true;

     if (!extensionEnabled || !opt_expected)
         expectSuccess = false;
     debug("Testing texture creation with extension " + (extensionEnabled ? "enabled" : "disabled") +
           ", format " + getFormatName(format) + ", and data " + (data ? "non-null" : "null") +
           ". Expect " + (expectSuccess ? "Success" : "Failure"));

     var texture = allocateTexture();
     var width = 2;
     var height = 2;
     gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, halfFloatOESEnum, data);
     if(!extensionEnabled) {
         wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Half floating point texture must be disallowed if OES_texture_half_float isn't enabled");
         return;
     } else if (!opt_expected) {
         wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Half floating point texture allocation must be disallowed when ArrayBufferView is not-null and not-Uint16");
         return;
     } else {
         wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");

         if (!data) {
             gl.texImage2D(gl.TEXTURE_2D, 0, format, format, halfFloatOESEnum, colorCanvas);
         }
         wtu.clearAndDrawUnitQuad(gl);
         wtu.checkCanvas(gl, opt_expected);
         // Check that linear fails.
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
         wtu.clearAndDrawUnitQuad(gl);
         wtu.checkCanvas(gl, [0, 0, 0, 255], "should be black");
     }

 }

 function checkRenderingResults()
 {
     wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
 }

 function runRenderTest(format, subtractor, data)
 {
     var formatString = wtu.glEnumToString(gl, format);

     debug("");

     if (!data) {
         debug("Testing half floating point " + formatString + " render target");
     } else {
         debug("Testing half floating point " + formatString + " from a Uint16Array");
     }

     var texture = allocateTexture();
     var width = 2;
     var height = 2;

     gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, ext.HALF_FLOAT_OES, data);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");

     if (!data) {
         // Try to use this texture as render target
         var fbo = gl.createFramebuffer();
         gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
         gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
         gl.bindTexture(gl.TEXTURE_2D, null);

         // It is legal for a WebGL implementation exposing the OES_texture_half_float extension to
         // support half floating point textures but not as attachments to framebuffer objects.
         if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
             debug("Half floating point render targets not supported -- this is legal");
             return;
         }

         var renderProgram =
             wtu.setupProgram(gl,
                              ["positionVertexShader", "floatingPointFragmentShader"],
                              ['vPosition'],
                              [0]);
         wtu.drawUnitQuad(gl);
         wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Rendering to half floating point texture should succeed");
     }

     // Now sample from the half floating-point texture and verify we got the correct values.
     var texturedShaders = [
       wtu.setupSimpleTextureVertexShader(gl),
           "testFragmentShader"
       ];
     var testProgram =
         wtu.setupProgram(gl,
                         [wtu.setupSimpleTextureVertexShader(gl), "testFragmentShader"],
                         ['vPosition', 'texCoord0'],
                         [0, 1]);
     var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
     gl.bindFramebuffer(gl.FRAMEBUFFER, null);
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.useProgram(testProgram);
     gl.uniform4fv(gl.getUniformLocation(testProgram, "subtractor"), subtractor);
     wtu.drawUnitQuad(gl);
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "rendering from half floating point texture should succeed");
     checkRenderingResults();
 }

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

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

	-->

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>WebGL OES_texture_half_float Conformance Tests</title>
	<script src="resources/desktop-gl-constants.js" type="text/javascript"></script>
	<script src="../../../resources/js-test.js"></script>
	<script src="resources/webgl-test.js"></script>
	<script src="resources/webgl-test-utils.js"></script></head>
	<body>
	<div id="description"></div>
	<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
	<canvas id="canvas2d" style="width: 50px; height: 50px;"> </canvas>
	<div id="console"></div>
	<script id="testFragmentShader" type="x-shader/x-fragment">
	precision mediump float;
	uniform sampler2D tex;
	uniform vec4 subtractor;
	varying vec2 texCoord;
	void main()
	{
	vec4 color = texture2D(tex, texCoord);
	if (abs(color.r - subtractor.r) +
	abs(color.g - subtractor.g) +
	abs(color.b - subtractor.b) +
	abs(color.a - subtractor.a) < 8.0) {
	gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
	} else {
	gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
	}
	}
	</script>
	<!-- Shaders for testing half-floating-point render targets -->
	<script id="positionVertexShader" type="x-shader/x-vertex">
	attribute vec4 vPosition;
	void main()
	{
	gl_Position = vPosition;
	}
	</script>
	<script id="floatingPointFragmentShader" type="x-shader/x-fragment">
	void main()
	{
	gl_FragColor = vec4(10000.0, 10000.0, 10000.0, 10000.0);
	}
	</script>
	<script>
	if (window.testRunner)
	window.testRunner.dumpAsText();

	"use strict"
	description("This test verifies the functionality of OES_texture_half_float with null/non-null ArrayBufferView");

	debug("");
	var wtu = WebGLTestUtils;
	var canvas = document.getElementById("canvas");
	var colorCanvas = document.getElementById("canvas2d");
	colorCanvas.width = 2;
	colorCanvas.height = 2;
	var ctx = colorCanvas.getContext("2d");
	ctx.fillStyle = "rgb(255,0,0)";
	ctx.fillRect(0, 0, 2, 2);
	var gl = wtu.create3DContext(canvas);
	// This constant must be defined in order to run the texture creation test without the extension enabled.
	var halfFloatOESEnum = 0x8D61;
	var ext = null;

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

	// Verify that allocation of texture fails if extension is not enabled
	runTextureCreationTest(false);
	ext = gl.getExtension("OES_texture_half_float")
	if (!ext) {
	testPassed("No OES_texture_half_float support. This is legal");
	} else {
	testPassed("Successfully enabled OES_texture_half_float extension");

	var program = wtu.setupTexturedQuad(gl);

	// Check if creation of texture succeed's with various formats and null ArrayBufferView
	var formats = [
	{ format: gl.RGBA, expected: [255, 0, 0, 255], },
	{ format: gl.RGB, expected: [255, 0, 0, 255], },
	{ format: gl.LUMINANCE, expected: [255, 255, 255, 255], },
	{ format: gl.ALPHA, expected: [ 0, 0, 0, 255], },
	{ format: gl.LUMINANCE_ALPHA, expected: [255, 255, 255, 255], },
	];
	formats.forEach(function(f) {
	runTextureCreationTest(true, f.format, null, f.expected);
	});

	// Texture creation should fail when passed with non-null, non-Uint16 ArrayBufferView
	formats.forEach(function(f) {
	var width = 2;
	var height = 2;
	var format = f.format;

	// Float32Array
	var float32Data = new Float32Array(width * height * getNumberOfChannels(format));
	for (var ii = 0; ii < float32Data.length; ii++) {
	float32Data[ii] = 1000;
	}
	runTextureCreationTest(true, format, float32Data, null);

	// Int16Array
	var int16Data = new Int16Array(width * height * getNumberOfChannels(format));
	for (var ii = 0; ii < int16Data.length; ii++) {
	int16Data[ii] = 1000;
	}
	runTextureCreationTest(true, format, int16Data, null);
	});

	// Test that Uint16 encoded half float values can be used as texture data.

	// First test that values in the 0-1 range can be written and read.
	var halfFloatOneThird = 0x3555; // Half float 1/3
	var uint16Formats = [
	{ format: gl.RGBA, expected: [85, 85, 85, 85], },
	{ format: gl.RGB, expected: [85, 85, 85, 255], },
	{ format: gl.LUMINANCE, expected: [85, 85, 85, 255], },
	{ format: gl.ALPHA, expected: [ 0, 0, 0, 85], },
	{ format: gl.LUMINANCE_ALPHA, expected: [85, 85, 85, 85], },
	];

	uint16Formats.forEach(function(f) {
	var width = 2;
	var height = 2;
	var format = f.format;

	var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
	for (var ii = 0; ii < uint16Data.length; ii++) {
	uint16Data[ii] = halfFloatOneThird;
	}
	runTextureCreationTest(true, format, uint16Data, f.expected);
	});

	// Next check that values outside the 0-1 range can be written.
	var halfFloatTenK = 0x70E2; // Half float 10000
	var uint16Formats2 = [
	{ format: gl.RGBA, subtractor: [10000, 10000, 10000, 10000], },
	{ format: gl.RGB, subtractor: [10000, 10000, 10000, 1], },
	];

	uint16Formats2.forEach(function(f) {
	var width = 2;
	var height = 2;
	var format = f.format;

	var uint16Data = new Uint16Array(width * height * getNumberOfChannels(format));
	for (var ii = 0; ii < uint16Data.length; ii++) {
	uint16Data[ii] = halfFloatTenK;
	}
	runRenderTest(format, f.subtractor, uint16Data);
	});

	// Check if attaching texture as FBO target succeeds (Not mandatory)
	runRenderTest(gl.RGBA, [10000, 10000, 10000, 10000], null);
	runRenderTest(gl.RGB, [10000, 10000, 10000, 1], null);

	// Check of getExtension() returns same object
	runUniqueObjectTest();
	}
	}

	function getNumberOfChannels(format)
	{
	if (format == gl.RGBA)
	return 4;
	else if (format == gl.RGB)
	return 3;
	else if (format == gl.LUMINANCE \|\| format == gl.ALPHA)
	return 1;
	else if (format == gl.LUMINANCE_ALPHA)
	return 2;
	}

	function getFormatName(format)
	{
	if (format == gl.RGBA)
	return "RGBA";
	else if (format == gl.RGB)
	return "RGB";
	else if (format == gl.LUMINANCE)
	return "LUMINANCE";
	else if (format == gl.ALPHA)
	return "ALPHA";
	else if (format == gl.LUMINANCE_ALPHA)
	return "LUMINANCE_ALPHA";
	}

	function allocateTexture()
	{
	var texture = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D, texture);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texture parameter setup should succeed");
	return texture;
	}

	function runTextureCreationTest(extensionEnabled, opt_format, opt_data, opt_expected)
	{
	var format = opt_format \|\| gl.RGBA;
	var data = opt_data \|\| null;
	var expectSuccess = true;

	if (!extensionEnabled \|\| !opt_expected)
	expectSuccess = false;
	debug("Testing texture creation with extension " + (extensionEnabled ? "enabled" : "disabled") +
	", format " + getFormatName(format) + ", and data " + (data ? "non-null" : "null") +
	". Expect " + (expectSuccess ? "Success" : "Failure"));

	var texture = allocateTexture();
	var width = 2;
	var height = 2;
	gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, halfFloatOESEnum, data);
	if(!extensionEnabled) {
	wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Half floating point texture must be disallowed if OES_texture_half_float isn't enabled");
	return;
	} else if (!opt_expected) {
	wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "Half floating point texture allocation must be disallowed when ArrayBufferView is not-null and not-Uint16");
	return;
	} else {
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");

	if (!data) {
	gl.texImage2D(gl.TEXTURE_2D, 0, format, format, halfFloatOESEnum, colorCanvas);
	}
	wtu.clearAndDrawUnitQuad(gl);
	wtu.checkCanvas(gl, opt_expected);
	// Check that linear fails.
	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
	wtu.clearAndDrawUnitQuad(gl);
	wtu.checkCanvas(gl, [0, 0, 0, 255], "should be black");
	}

	}

	function checkRenderingResults()
	{
	wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
	}

	function runRenderTest(format, subtractor, data)
	{
	var formatString = wtu.glEnumToString(gl, format);

	debug("");

	if (!data) {
	debug("Testing half floating point " + formatString + " render target");
	} else {
	debug("Testing half floating point " + formatString + " from a Uint16Array");
	}

	var texture = allocateTexture();
	var width = 2;
	var height = 2;

	gl.texImage2D(gl.TEXTURE_2D, 0, format, width, height, 0, format, ext.HALF_FLOAT_OES, data);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Half floating point texture allocation should succeed if OES_texture_half_float is enabled");

	if (!data) {
	// Try to use this texture as render target
	var fbo = gl.createFramebuffer();
	gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
	gl.bindTexture(gl.TEXTURE_2D, null);

	// It is legal for a WebGL implementation exposing the OES_texture_half_float extension to
	// support half floating point textures but not as attachments to framebuffer objects.
	if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
	debug("Half floating point render targets not supported -- this is legal");
	return;
	}

	var renderProgram =
	wtu.setupProgram(gl,
	["positionVertexShader", "floatingPointFragmentShader"],
	['vPosition'],
	[0]);
	wtu.drawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Rendering to half floating point texture should succeed");
	}

	// Now sample from the half floating-point texture and verify we got the correct values.
	var texturedShaders = [
	wtu.setupSimpleTextureVertexShader(gl),
	"testFragmentShader"
	];
	var testProgram =
	wtu.setupProgram(gl,
	[wtu.setupSimpleTextureVertexShader(gl), "testFragmentShader"],
	['vPosition', 'texCoord0'],
	[0, 1]);
	var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
	gl.bindFramebuffer(gl.FRAMEBUFFER, null);
	gl.bindTexture(gl.TEXTURE_2D, texture);
	gl.useProgram(testProgram);
	gl.uniform4fv(gl.getUniformLocation(testProgram, "subtractor"), subtractor);
	wtu.drawUnitQuad(gl);
	wtu.glErrorShouldBe(gl, gl.NO_ERROR, "rendering from half floating point texture should succeed");
	checkRenderingResults();
	}

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

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

	</body>
	</html>