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| author | Brian Paul <brian.paul@tungstengraphics.com> | 2003-03-08 17:38:57 +0000 |
|---|---|---|
| committer | Brian Paul <brian.paul@tungstengraphics.com> | 2003-03-08 17:38:57 +0000 |
| commit | 0b27aceae2464db3dd149cf4fd667e353a655c5e (patch) | |
| tree | a8df88dd0893e04a6fe4f125ddd361a1bde9d7ae /docs/osmesa.html | |
| parent | dc32636cfd38916ad7b2150e10765026dbb64ce5 (diff) | |
Documentation/website overhaul. The website content and doc/ directory
are now merged and are one and the same.
Diffstat (limited to 'docs/osmesa.html')
| -rw-r--r-- | docs/osmesa.html | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/docs/osmesa.html b/docs/osmesa.html new file mode 100644 index 0000000000..ace4200113 --- /dev/null +++ b/docs/osmesa.html @@ -0,0 +1,74 @@ +<HTML> + +<TITLE>Off-screen Rendering</TITLE> + +<BODY text="#000000" bgcolor="#55bbff" link="#111188"> + +<H1>Off-screen Rendering</H1> + + +<p> +Mesa 1.2.4 introduced off-screen rendering, a facility for generating +3-D imagery without having to open a window on your display. Mesa's +simple off-screen rendering interface is completely operating system +and window system independent so programs which use off-screen +rendering should be very portable. This feature effectively +enables you to use Mesa as an off-line, batch-oriented renderer. +</p> +<p> +The "OSMesa" API provides 3 functions for making off-screen +renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and +OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for +more information. See the demos/osdemo.c file for an example program. +There is no facility for writing images to files. That's up to you. +</p> +<p> +If you want to generate large images (larger than 1280x1024) you'll +have to edit the src/config.h file to change MAX_WIDTH and MAX_HEIGHT +then recompile Mesa. Image size should only be limited by available +memory. +</p> + + +<H2>Deep color channels</H2> + +<p> + For some applications 8-bit color channels don't have sufficient + accuracy (film and IBR, for example). If you're in this situation + you'll be happy to know that Mesa supports 16-bit and 32-bit color + channels through the OSMesa interface. When using 16-bit channels, + channels are GLushorts and pixels occupy 8 bytes. When using 32-bit + channels, channels are GLfloats and pixels occupy 16 bytes. +</p> +<p> + To build Mesa/OSMesa with 16-bit color channels: +<pre> + cd Mesa-4.x/src + make -f Makefile.X11 clean + make -f Makefile.OSMesa16 linux-osmesa16 +</pre> + + For 32-bit channels: +<pre> + cd Mesa-4.x/src + make -f Makefile.X11 clean + make -f Makefile.OSMesa16 linux-osmesa32 +</pre> + +<p> +If you're not using Linux, you can easily edit Make-config and add +an appropriate configuration. +</p> +<p> +The Mesa/tests/osdemo16.c file (available via CVS) demonstrates how +to use this feature. +</p> +<p> +BE WARNED: 16 and 32-bit channel support has not been exhaustively +tested and there may be some bugs. However, a number of people have +been using this feature successfully so it can't be too broken. +</p> + + +</BODY> +</HTML> |