The Tor Browser: content/canvas/test/webgl-conformance/conformance/extensions/oes-texture-float.html@b8a032363ba2 (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-texture-float.html@b8a032363ba2 (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-texture-float.html

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 <!--
 Copyright (c) 2011 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
  -->
 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL OES_texture_float Conformance Tests</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../resources/desktop-gl-constants.js" type="text/javascript"></script>
 <script src="../../resources/js-test-pre.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>
 <div id="console"></div>
 <!-- Shaders for testing floating-point textures -->
 <script id="testFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 uniform sampler2D tex;
 varying vec2 texCoord;
 void main()
 {
     vec4 color = texture2D(tex, texCoord);
     if (abs(color.r - 10000.0) +
         abs(color.g - 10000.0) +
         abs(color.b - 10000.0) +
         abs(color.a - 10000.0) < 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 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>
 description("This test verifies the functionality of the OES_texture_float extension, if it is available.");
 debug("");
 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("canvas");
 var gl = create3DContext(canvas);
 if (!gl) {
   testFailed("WebGL context does not exist");
 } else {
   testPassed("WebGL context exists");
   var texturedShaders = [
       wtu.setupSimpleTextureVertexShader(gl),
       "testFragmentShader"
   ];
   var testProgram =
       wtu.setupProgram(gl,
                        texturedShaders,
                        ['vPosition', 'texCoord0'],
                        [0, 1]);
   var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
   // First verify that allocation of floating-point textures fails if
   // the extension has not been enabled yet.
   runTextureCreationTest(testProgram, false);
   if (!gl.getExtension("OES_texture_float")) {
       testPassed("No OES_texture_float support -- this is legal");
   } else {
       testPassed("Successfully enabled OES_texture_float extension");
       runTextureCreationTest(testProgram, true);
       runRenderTargetTest(testProgram);
       runUniqueObjectTest();
       runReferenceCycleTest();
   }
 }
 // Needs to be global for shouldBe to see it.
 var pixels;
 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);
     glErrorShouldBe(gl, gl.NO_ERROR, "texture parameter setup should succeed");
     return texture;
 }
 function checkRenderingResults()
 {
     pixels = new Uint8Array(4);
     gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
     // Outputs green if OK, red if not.
     shouldBe("pixels[0]", "0");
     shouldBe("pixels[1]", "255");
     shouldBe("pixels[2]", "0");
     shouldBe("pixels[3]", "255");
 }
 function runTextureCreationTest(testProgram, extensionEnabled)
 {
     var expectFailure = !extensionEnabled;
     var texture = allocateTexture();
     // Generate data.
     var width = 2;
     var height = 2;
     var numberOfChannels = 4;
     var data = new Float32Array(width * height * numberOfChannels);
     for (var ii = 0; ii < data.length; ++ii) {
         data[ii] = 10000;
     }
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, data);
     if (expectFailure) {
         glErrorShouldBe(gl, gl.INVALID_ENUM, "floating-point texture allocation must be disallowed if OES_texture_float isn't enabled");
         return;
     } else {
         glErrorShouldBe(gl, gl.NO_ERROR, "floating-point texture allocation should succeed if OES_texture_float is enabled");
     }
     // Verify that the texture actually works for sampling and contains the expected data.
     gl.uniform1i(gl.getUniformLocation(testProgram, "tex"), 0);
     wtu.drawQuad(gl);
     checkRenderingResults();
 }
 function runRenderTargetTest(testProgram)
 {
     var texture = allocateTexture();
     var width = 2;
     var height = 2;
     var numberOfChannels = 4;
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, null);
     glErrorShouldBe(gl, gl.NO_ERROR, "floating-point texture allocation should succeed if OES_texture_float is enabled");
     // Use this texture as a 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);
     shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
     // While strictly speaking it is probably legal for a WebGL implementation to support
     // floating-point textures but not as attachments to framebuffer objects, any such
     // implementation is so poor that it arguably should not advertise support for the
     // OES_texture_float extension. For this reason the conformance test requires that the
     // framebuffer is complete here.
     if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
         return;
     var renderProgram =
         wtu.setupProgram(gl,
                          ["positionVertexShader", "floatingPointFragmentShader"],
                          ['vPosition'],
                          [0]);
     wtu.drawQuad(gl);
     glErrorShouldBe(gl, gl.NO_ERROR, "rendering to floating-point texture should succeed");
     // Now sample from the floating-point texture and verify we got the correct values.
     gl.bindFramebuffer(gl.FRAMEBUFFER, null);
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.useProgram(testProgram);
     gl.uniform1i(gl.getUniformLocation(testProgram, "tex"), 0);
     wtu.drawQuad(gl);
     glErrorShouldBe(gl, gl.NO_ERROR, "rendering from floating-point texture should succeed");
     checkRenderingResults();
 }
 function runUniqueObjectTest()
 {
     debug("Testing that getExtension() returns the same object each time");
     gl.getExtension("OES_texture_float").myProperty = 2;
     gc();
     shouldBe('gl.getExtension("OES_texture_float").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("Testing reference cycles between context and extension objects");
     var ext = gl.getExtension("OES_texture_float");
     // 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;
 }
 debug("");
 successfullyParsed = true;
 </script>
 <script>finishTest();</script>
 </body>
 </html>

The Tor Browser / annotate

content/canvas/test/webgl-conformance/conformance/extensions/oes-texture-float.html@b8a032363ba2 (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-texture-float.html