The Tor Browser: content/canvas/test/webgl-conformance/conformance/extensions/oes-standard-derivatives.html@4ab42b5ab56c (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-standard-derivatives.html@4ab42b5ab56c (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-standard-derivatives.html

Wed, 31 Dec 2014 07:53:36 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:53:36 +0100
branch: TOR_BUG_3246
changeset 5: 4ab42b5ab56c
permissions: -rw-r--r--

Correct small whitespace inconsistency, lost while renaming variables.

 <!--
 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_standard_derivatives 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 standard derivatives -->
 <!-- Shader omitting the required #extension pragma -->
 <script id="missingPragmaFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 varying vec2 texCoord;
 void main() {
     float dx = dFdx(texCoord.x);
     float dy = dFdy(texCoord.y);
     float w = fwidth(texCoord.x);
     gl_FragColor = vec4(dx, dy, w, 1.0);
 }
 </script>
 <!-- Shader to test macro definition -->
 <script id="macroFragmentShader" type="x-shader/x-fragment">
 precision mediump float;
 void main() {
 #ifdef GL_OES_standard_derivatives
     gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
 #else
     // Error expected
     #error no GL_OES_standard_derivatives;
 #endif
 }
 </script>
 <!-- Shader with required #extension pragma -->
 <script id="testFragmentShader" type="x-shader/x-fragment">
 #extension GL_OES_standard_derivatives : enable
 precision mediump float;
 varying vec2 texCoord;
 void main() {
     float dx = dFdx(texCoord.x);
     float dy = dFdy(texCoord.y);
     float w = fwidth(texCoord.x);
     gl_FragColor = vec4(dx, dy, w, 1.0);
 }
 </script>
 <!-- Shaders to link with test fragment shaders -->
 <script id="goodVertexShader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 varying vec2 texCoord;
 void main() {
     texCoord = vPosition.xy;
     gl_Position = vPosition;
 }
 </script>
 <!-- Shaders to test output -->
 <script id="outputVertexShader" type="x-shader/x-vertex">
 attribute vec4 vPosition;
 varying vec4 position;
 void main() {
     position = vPosition;
     gl_Position = vPosition;
 }
 </script>
 <script id="outputFragmentShader" type="x-shader/x-fragment">
 #extension GL_OES_standard_derivatives : enable
 precision mediump float;
 varying vec4 position;
 void main() {
     float dzdx = dFdx(position.z);
     float dzdy = dFdy(position.z);
     float fw = fwidth(position.z);
     gl_FragColor = vec4(abs(dzdx), abs(dzdy), fw, 1.0);
 }
 </script>
 <script>
 description("This test verifies the functionality of the OES_standard_derivatives extension, if it is available.");
 debug("");
 var wtu = WebGLTestUtils;
 var canvas = document.getElementById("canvas");
 var gl = create3DContext(canvas);
 var ext = null;
 if (!gl) {
     testFailed("WebGL context does not exist");
 } else {
     testPassed("WebGL context exists");
     // Run tests with extension disabled
     runHintTestDisabled();
     runShaderTests(false);
     // Query the extension and store globally so shouldBe can access it
     ext = gl.getExtension("OES_standard_derivatives");
     if (!ext) {
         testPassed("No OES_standard_derivatives support -- this is legal");
         runSupportedTest(false);
     } else {
         testPassed("Successfully enabled OES_standard_derivatives extension");
         runSupportedTest(true);
         runHintTestEnabled();
         runShaderTests(true);
         runOutputTests();
         runUniqueObjectTest();
         runReferenceCycleTest();
     }
 }
 function runSupportedTest(extensionEnabled) {
     var supported = gl.getSupportedExtensions();
     if (supported.indexOf("OES_standard_derivatives") >= 0) {
         if (extensionEnabled) {
             testPassed("OES_standard_derivatives listed as supported and getExtension succeeded");
         } else {
             testFailed("OES_standard_derivatives listed as supported but getExtension failed");
         }
     } else {
         if (extensionEnabled) {
             testFailed("OES_standard_derivatives not listed as supported but getExtension succeeded");
         } else {
             testPassed("OES_standard_derivatives not listed as supported and getExtension failed -- this is legal");
         }
     }
 }
 function runHintTestDisabled() {
     debug("Testing FRAGMENT_SHADER_DERIVATIVE_HINT_OES with extension disabled");
     // Use the constant directly as we don't have the extension
     var FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
     gl.getParameter(FRAGMENT_SHADER_DERIVATIVE_HINT_OES);
     glErrorShouldBe(gl, gl.INVALID_ENUM, "FRAGMENT_SHADER_DERIVATIVE_HINT_OES should not be queryable if extension is disabled");
     gl.hint(FRAGMENT_SHADER_DERIVATIVE_HINT_OES, gl.DONT_CARE);
     glErrorShouldBe(gl, gl.INVALID_ENUM, "hint should not accept FRAGMENT_SHADER_DERIVATIVE_HINT_OES if extension is disabled");
 }
 function runHintTestEnabled() {
     debug("Testing FRAGMENT_SHADER_DERIVATIVE_HINT_OES with extension enabled");
     shouldBe("ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES", "0x8B8B");
     gl.getParameter(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES);
     glErrorShouldBe(gl, gl.NO_ERROR, "FRAGMENT_SHADER_DERIVATIVE_HINT_OES query should succeed if extension is enabled");
     // Default value is DONT_CARE
     if (gl.getParameter(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES) == gl.DONT_CARE) {
         testPassed("Default value of FRAGMENT_SHADER_DERIVATIVE_HINT_OES is DONT_CARE");
     } else {
         testFailed("Default value of FRAGMENT_SHADER_DERIVATIVE_HINT_OES is not DONT_CARE");
     }
     // Ensure that we can set the target
     gl.hint(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES, gl.DONT_CARE);
     glErrorShouldBe(gl, gl.NO_ERROR, "hint should accept FRAGMENT_SHADER_DERIVATIVE_HINT_OES");
     // Test all the hint modes
     var validModes = ["FASTEST", "NICEST", "DONT_CARE"];
     var anyFailed = false;
     for (var n = 0; n < validModes.length; n++) {
         var mode = validModes[n];
         gl.hint(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES, gl[mode]);
         if (gl.getParameter(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES) != gl[mode]) {
             testFailed("Round-trip of hint()/getParameter() failed on mode " + mode);
             anyFailed = true;
         }
     }
     if (!anyFailed) {
         testPassed("Round-trip of hint()/getParameter() with all supported modes");
     }
 }
 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_OES_standard_derivatives defined in shaders when extension is enabled");
         } else {
             testFailed("GL_OES_standard_derivatives not defined in shaders when extension is enabled");
         }
     } else {
         if (macroFragmentProgram) {
             testFailed("GL_OES_standard_derivatives defined in shaders when extension is disabled");
         } else {
             testPassed("GL_OES_standard_derivatives 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() {
     // This tests does several draws with various values of z.
     // The output of the fragment shader is:
     // [dFdx(z), dFdy(z), fwidth(z), 1.0]
     // The expected math: (note the conversion to uint8)
     //    canvas.width = canvas.height = 50
     //    dFdx = totalChange.x / canvas.width  = 0.5 / 50.0 = 0.01
     //    dFdy = totalChange.y / canvas.height = 0.5 / 50.0 = 0.01
     //    fw = abs(dFdx + dFdy) = 0.01 + 0.01 = 0.02
     //    r = floor(dFdx * 255) = 3
     //    g = floor(dFdy * 255) = 3
     //    b = floor(fw * 255) = 5
     var e = 2; // Amount of variance to allow in result pixels - may need to be tweaked higher
     debug("Testing various draws for valid built-in function behavior");
     canvas.width = 50; canvas.height = 50;
     gl.viewport(0, 0, canvas.width, canvas.height);
     gl.hint(ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES, gl.NICEST);
     var program = wtu.setupProgram(gl, ["outputVertexShader", "outputFragmentShader"], ['vPosition', 'texCoord0'], [0, 1]);
     var quadParameters = wtu.setupUnitQuad(gl, 0, 1);
     function readLocation(x, y) {
         var pixels = new Uint8Array(1 * 1 * 4);
         var px = Math.floor(x * canvas.width);
         var py = Math.floor(y * canvas.height);
         gl.readPixels(px, py, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
         return pixels;
     };
     function toString(arr) {
         var s = "[";
         for (var n = 0; n < arr.length; n++) {
             s += arr[n];
             if (n < arr.length - 1) {
                 s += ", ";
             }
         }
         return s + "]";
     };
     function expectResult(target, successMessage, failureMessage) {
         var locations = [
             readLocation(0.1, 0.1),
             readLocation(0.9, 0.1),
             readLocation(0.1, 0.9),
             readLocation(0.9, 0.9),
             readLocation(0.5, 0.5)
         ];
         var anyDiffer = false;
         for (var n = 0; n < locations.length; n++) {
             var source = locations[n];
             for (var m = 0; m < 4; m++) {
                 if (Math.abs(source[m] - target[m]) > e) {
                     anyDiffer = true;
                     testFailed(failureMessage + "; should be " + toString(target) + ", was " + toString(source));
                     break;
                 }
             }
         }
         if (!anyDiffer) {
             testPassed(successMessage);
         }
     };
     function setupBuffers(tl, tr, bl, br) {
         gl.bindBuffer(gl.ARRAY_BUFFER, quadParameters[0]);
         gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
 .0,  1.0, tr,
           -1.0,  1.0, tl,
           -1.0, -1.0, bl,
 .0,  1.0, tr,
           -1.0, -1.0, bl,
 .0, -1.0, br]), gl.STATIC_DRAW);
     };
     // Draw 1: (no variation)
     setupBuffers(0.0, 0.0, 0.0, 0.0);
     wtu.drawQuad(gl);
     expectResult([0, 0, 0, 255],
                  "Draw 1 (no variation) returned the correct data",
                  "Draw 1 (no variation) returned incorrect data");
     // Draw 2: (variation in x)
     setupBuffers(1.0, 0.0, 1.0, 0.0);
     wtu.drawQuad(gl);
     expectResult([5, 0, 5, 255],
                  "Draw 2 (variation in x) returned the correct data",
                  "Draw 2 (variation in x) returned incorrect data");
     // Draw 3: (variation in y)
     setupBuffers(1.0, 1.0, 0.0, 0.0);
     wtu.drawQuad(gl);
     expectResult([0, 5, 5, 255],
                  "Draw 3 (variation in y) returned the correct data",
                  "Draw 3 (variation in y) returned incorrect data");
     // Draw 4: (variation in x & y)
     setupBuffers(1.0, 0.5, 0.5, 0.0);
     wtu.drawQuad(gl);
     expectResult([3, 3, 5, 255],
                  "Draw 4 (variation in x & y) returned the correct data",
                  "Draw 4 (variation in x & y) returned incorrect data");
 }
 function runUniqueObjectTest()
 {
     debug("Testing that getExtension() returns the same object each time");
     gl.getExtension("OES_standard_derivatives").myProperty = 2;
     gc();
     shouldBe('gl.getExtension("OES_standard_derivatives").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_standard_derivatives");
     // 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-standard-derivatives.html@4ab42b5ab56c (annotated)

content/canvas/test/webgl-conformance/conformance/extensions/oes-standard-derivatives.html