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| 3 <html lang="en"> | |
| 4 <head> | |
| 5 <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| 6 <title>WebGL OES_standard_derivatives Extension Specification</title> | |
| 7 <link rel="stylesheet" type="text/css" href="../../resources/webgl-extension
.css" /> | |
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cript> | |
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| 11 <!--begin-logo--> | |
| 12 <div> | |
| 13 <a href="http://webgl.org/"><img alt=WebGL height=72 src="../../resources/
WebGL-Logo.png" width=156></a> | |
| 14 <div class=right> | |
| 15 <a href="http://khronos.org/"><img alt=Khronos height=60 src="../../reso
urces/KhronosGroup-3D.png" width=220></a> | |
| 16 </div> | |
| 17 </div> | |
| 18 <!--end-logo--> | |
| 19 | |
| 20 <h1>WebGL OES_standard_derivatives Extension Specification</h1> | |
| 21 | |
| 22 <h2 class="no-toc">Name</h2> | |
| 23 <p> OES_standard_derivatives </p> | |
| 24 | |
| 25 <h2 class="no-toc">Contact</h2> | |
| 26 <p> <a href="https://www.khronos.org/webgl/public-mailing-list/">WebGL worki
ng group</a> (public_webgl 'at' khronos.org) </p> | |
| 27 | |
| 28 <h2 class="no-toc">Contributors</h2> | |
| 29 <p> Members of the WebGL working group </p> | |
| 30 | |
| 31 <h2 class="no-toc">Version</h2> | |
| 32 <p> Last modified date: January 13, 2010 <br> | |
| 33 Revision: 1 | |
| 34 </p> | |
| 35 | |
| 36 <h2 class="no-toc">Number</h2> | |
| 37 <p> WebGL extension #4 </p> | |
| 38 | |
| 39 <h2 class="no-toc">Dependencies</h2> | |
| 40 <p> Written against the WebGL API 1.0 specification. </p> | |
| 41 | |
| 42 <h2 class="no-toc">Overview</h2> | |
| 43 <p> | |
| 44 This extension exposes the | |
| 45 <a href="http://www.khronos.org/registry/gles/extensions/OES/OES_standard_
derivatives.txt">OES_standard_derivatives</a> | |
| 46 functionality to WebGL. There are no WebGL-specific behavioral changes. C
onsult the above | |
| 47 extension for all documentation, issues, and new functions and enumerants. | |
| 48 </p> | |
| 49 <p> | |
| 50 When this extension is enabled: | |
| 51 <ul> | |
| 52 <li> The <code>hint</code> entry point accepts <code>FRAGMENT_SHADER_DERIV
ATIVE_HINT_OES</code> | |
| 53 as a target and the <code>getParameter</code> entry point accepts it
as a pname. | |
| 54 <li> The built-in functions <code>dFdx()</code>, <code>dFdy()</code>, and
<code>fwidth()</code> | |
| 55 are available in fragment shaders if the following directive is added
to the shader: | |
| 56 <pre> | |
| 57 #extension GL_OES_standard_derivatives : enable | |
| 58 </pre> | |
| 59 <li> The following macro definition is available: | |
| 60 <pre> | |
| 61 #define GL_OES_standard_derivatives 1 | |
| 62 </pre> | |
| 63 </ul> | |
| 64 </p> | |
| 65 | |
| 66 <h2 class="no-toc">IDL</h2> | |
| 67 <p> | |
| 68 <pre class="idl"> | |
| 69 module webgl { | |
| 70 | |
| 71 interface OES_standard_derivatives { | |
| 72 const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B; | |
| 73 }; | |
| 74 | |
| 75 }; | |
| 76 </pre> | |
| 77 </p> | |
| 78 | |
| 79 <h2 class="no-toc">Revision History</h2> | |
| 80 <p> | |
| 81 Revision 1, 2010/01/13 | |
| 82 <ul> | |
| 83 <li> Initial revision. | |
| 84 </ul> | |
| 85 </p> | |
| 86 </body> | |
| 87 </html> | |
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Chromium Code Reviews
Issue 9360034:
Remove everthing except conformance tests in the deps/third_party/webgl (Closed)
Base URL: svn://chrome-svn/chrome/trunk/deps/