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diff --git a/docs/opengles.html b/docs/opengles.html new file mode 100644 index 0000000000..63cc1146a2 --- /dev/null +++ b/docs/opengles.html @@ -0,0 +1,80 @@ +<html> + +<title>OpenGL ES</title> + +<head><link rel="stylesheet" type="text/css" href="mesa.css"></head> + +<body> + +<h1>OpenGL ES</h1> + +<p>Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0. More informations about +OpenGL ES can be found at <a href="http://www.khronos.org/opengles/" +target="_parent"> http://www.khronos.org/opengles/</a>.</p> + +<p>OpenGL ES depends on a working EGL implementation. Please refer to +<a href="egl.html">Mesa EGL</a> for more information about EGL.</p> + +<h2>Build the Libraries</h2> +<ol> +<li>Run <code>configure</code> with <code>--enable-gles-overlay</code> and enable the Gallium driver for your hardware.</li> +<li>Build and install Mesa as usual.</li> +</ol> + +Alternatively, if XCB-DRI2 is installed on the system, one can use +<code>egl_dri2</code> EGL driver with OpenGL|ES-enabled DRI drivers + +<ol> +<li>Run <code>configure</code> with <code>--enable-gles1 --enable-gles2</code>.</li> +<li>Build and install Mesa as usual.</li> +</ol> + +<p>Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or more +EGL drivers for your hardware.</p> + +<h2>Run the Demos</h2> + +<p>There are some demos in <code>progs/egl/</code>. You can use them to test +your build. For example,</p> + +<pre> + $ cd progs/egl/eglut + $ make + $ cd ../opengles1 + $ make + $ ./torus_x11 +</pre> + +<h2>Developers</h2> + +<h3>Internal Libraries</h3> + +<table border="1" style="text-align: center;"> + <tr><td>Library Name</td><td>Used By</td><td>Enabled</td><td>OpenGL</td><td>OpenGL ES 1.x</td><td>OpenGL ES 2.x</td></tr> + <tr><td><code>libmesa.a</td><td>Classic DRI drivers</td><td>y</td><td>y</td><td>--enable-gles1</td><td>--enable-gles2</td></tr> + <tr><td><code>libmesagallium.a</td><td>Gallium EGL and DRI drivers</td><td>y</td><td>y</td><td>--enable-gles1</td><td>--enable-gles2</td></tr> + <tr><td><code>libes1gallium.a</td><td>Gallium EGL drivers</td><td>--enable-gles-overlay</td><td>n</td><td>y</td><td>n</td></tr> + <tr><td><code>libes2gallium.a</td><td>Gallium EGL drivers</td><td>--enable-gles-overlay</td><td>n</td><td>n</td><td>y</td></tr> +</table> + +<h3>Dispatch Table</h3> + +<p>OpenGL ES has an additional indirection when dispatching fucntions</p> + +<pre> + Mesa: glFoo() --> _mesa_Foo() + OpenGL ES: glFoo() --> _es_Foo() --> _mesa_Foo() +</pre> + +<p>The indirection serves several purposes</p> + +<ul> +<li>When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.</li> +<li>When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.</li> +<li>When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.</li> +</ul> + +<p>Other than the last case, OpenGL ES uses <code>APIspec.xml</code> to generate functions to check and/or converts the arguments.</p> + +</body> +</html> |