1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <html lang="en"> 3 <head> 4 <meta http-equiv="content-type" content="text/html; charset=utf-8"> 5 <title>OpenGL ES</title> 6 <link rel="stylesheet" type="text/css" href="mesa.css"> 7 </head> 8 <body> 9 10 <div class="header"> 11 <h1>The Mesa 3D Graphics Library</h1> 12 </div> 13 14 <iframe src="contents.html"></iframe> 15 <div class="content"> 16 17 <h1>OpenGL ES</h1> 18 19 <p>Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0. More information about 20 OpenGL ES can be found at <a href="http://www.khronos.org/opengles/"> 21 http://www.khronos.org/opengles/</a>.</p> 22 23 <p>OpenGL ES depends on a working EGL implementation. Please refer to 24 <a href="egl.html">Mesa EGL</a> for more information about EGL.</p> 25 26 <h2>Build the Libraries</h2> 27 <ol> 28 <li>Run <code>configure</code> with <code>--enable-gles1 --enable-gles2</code> and enable the Gallium driver for your hardware.</li> 29 <li>Build and install Mesa as usual.</li> 30 </ol> 31 32 Alternatively, if XCB-DRI2 is installed on the system, one can use 33 <code>egl_dri2</code> EGL driver with OpenGL|ES-enabled DRI drivers 34 35 <ol> 36 <li>Run <code>configure</code> with <code>--enable-gles1 --enable-gles2</code>.</li> 37 <li>Build and install Mesa as usual.</li> 38 </ol> 39 40 <p>Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or more 41 EGL drivers for your hardware.</p> 42 43 <h2>Run the Demos</h2> 44 45 <p>There are some demos in <code>mesa/demos</code> repository.</p> 46 47 <h2>Developers</h2> 48 49 <h3>Dispatch Table</h3> 50 51 <p>OpenGL ES has an additional indirection when dispatching functions</p> 52 53 <pre> 54 Mesa: glFoo() --> _mesa_Foo() 55 OpenGL ES: glFoo() --> _es_Foo() --> _mesa_Foo() 56 </pre> 57 58 <p>The indirection serves several purposes</p> 59 60 <ul> 61 <li>When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.</li> 62 <li>When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.</li> 63 <li>When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.</li> 64 </ul> 65 66 <p>Other than the last case, OpenGL ES uses <code>APIspec.xml</code> to generate functions to check and/or converts the arguments.</p> 67 68 </div> 69 </body> 70 </html> 71
