From 0b27aceae2464db3dd149cf4fd667e353a655c5e Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Sat, 8 Mar 2003 17:38:57 +0000 Subject: Documentation/website overhaul. The website content and doc/ directory are now merged and are one and the same. --- docs/osmesa.html | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 docs/osmesa.html (limited to 'docs/osmesa.html') 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 @@ + + +Off-screen Rendering + + + +

Off-screen Rendering

+ + +

+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. +

+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. +

+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. +

+ + +

Deep color channels

+ +

+ 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. +

+ To build Mesa/OSMesa with 16-bit color channels: +

+      cd Mesa-4.x/src
+      make -f Makefile.X11 clean
+      make -f Makefile.OSMesa16 linux-osmesa16
+

+ + For 32-bit channels: +

+      cd Mesa-4.x/src
+      make -f Makefile.X11 clean
+      make -f Makefile.OSMesa16 linux-osmesa32
+

+ +

+If you're not using Linux, you can easily edit Make-config and add +an appropriate configuration. +

+The Mesa/tests/osdemo16.c file (available via CVS) demonstrates how +to use this feature. +

+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. +

+ + + + -- cgit v1.2.3