From 8667d4d97a3e958a7f63c18c34a62469ba5d2079 Mon Sep 17 00:00:00 2001 From: ftrapero Date: Thu, 15 Jun 2017 14:15:08 +0200 Subject: Squashed 'nx-X11/extras/Mesa_6.4.1/' content from commit 53d1bc0 git-subtree-dir: nx-X11/extras/Mesa_6.4.1 git-subtree-split: 53d1bc081eb633aecbd5ab0bf3981f734a2102f2 --- docs/osmesa.html | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 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 000000000..6feb8df52 --- /dev/null +++ b/docs/osmesa.html @@ -0,0 +1,77 @@ + + +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 RGBA pixels occupy 8 bytes. When using 32-bit + channels, channels are GLfloats and RGBA pixels occupy 16 bytes. +

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

+      make realclean
+      make linux-osmesa16
+

+ + For 32-bit channels: +

+      make realclean
+      make linux-osmesa32
+

+ +

+You'll wind up with a library named libOSMesa16.so or libOSMesa32.so. +

+ +

+If you need to compile on a non-Linux platform, copy Mesa/configs/linux-osmesa16 +to a new config file and edit it as needed. Then, add the new config name to +the top-level Makefile. Send a patch to the Mesa developers too, if you're +inclined. +

+ +

+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