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| <div class="header"> |
| <h1>The Mesa 3D Graphics Library</h1> |
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| <h1>Off-screen Rendering</h1> |
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| <p> |
| Mesa's off-screen interface is used for rendering into user-allocated memory |
| without any sort of window system or operating system dependencies. |
| That is, the GL_FRONT colorbuffer is actually a buffer in main memory, |
| rather than a window on your display. |
| </p> |
| |
| <p> |
| The OSMesa API provides three basic functions for making off-screen |
| renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and |
| OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for |
| more information about the API functions. |
| </p> |
| |
| <p> |
| The OSMesa interface may be used with any of three software renderers: |
| </p> |
| <ol> |
| <li>llvmpipe - this is the high-performance Gallium LLVM driver |
| <li>softpipe - this it the reference Gallium software driver |
| <li>swrast - this is the legacy Mesa software rasterizer |
| </ol> |
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| <p> |
| There are several examples of OSMesa in the mesa/demos repository. |
| </p> |
| |
| <h1>Building OSMesa</h1> |
| |
| <p> |
| Configure and build Mesa with something like: |
| |
| <pre> |
| configure --enable-osmesa --disable-driglx-direct --disable-dri --with-gallium-drivers=swrast |
| make |
| </pre> |
| |
| <p> |
| Make sure you have LLVM installed first if you want to use the llvmpipe driver. |
| </p> |
| |
| <p> |
| When the build is complete you should find: |
| </p> |
| <pre> |
| lib/libOSMesa.so (swrast-based OSMesa) |
| lib/gallium/libOSMsea.so (gallium-based OSMesa) |
| </pre> |
| |
| <p> |
| Set your LD_LIBRARY_PATH to point to one directory or the other to select |
| the library you want to use. |
| </p> |
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| <p> |
| When you link your application, link with -lOSMesa |
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