115 lines
3.4 KiB
Plaintext
115 lines
3.4 KiB
Plaintext
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Mesa / BeOS Information
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* Introduction
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Brian Paul added in Mesa 3.1 a driver for BeOS R4.5 operating system.
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This driver implements a clone of the BGLView class. This class, derived from BView, allows
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OpenGL rendering into any BeOS window.
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His driver was updated in Mesa 4.1 by Philippe Houdoin,
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who's maintaining this driver since.
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Any application which uses the BGLView should be able to use Mesa
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instead of Be's OpenGL without changing any code.
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Since Be's OpenGL implementation (as of R5) is basically just the
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SGI sample implementation, it's pretty slow. You'll see that Mesa
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is considerably faster.
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* Source Code
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The source code for the driver is in src/mesa/drivers/beos/ directory.
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It's not 100% finished at this time but many GLUT-based demos are
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working. No optimizations have been made at this time.
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* Compiling
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Requirements:
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- gcc version 2.95.3 for BeOS
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You can find it here: http://www.bebits.com/app/2157
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Move to the src/mesa sub-directory and then type "make -f Makefile.BeOS".
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When it finishes the Mesa based libGL.so library for
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BeOS will be in the src/mesa/src/obj.{x86|ppc}/ directory.
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To install it as Be's default libGL.so replacement, put it in your
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/boot/home/config/lib/ directory. All your GL/GLUT apps will use
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the Mesa based then.
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By default, it build a non-debug version library.
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The x86 (MMX, SSE and 3DNOW) optimizations are also supported for x86 target.
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For PowerPC BeOS flavor, sorry, Mesa don't have ppc (Altivec) optimizations yet.
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* Example Programs
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Look in the progs/beos/ directory for one or two BGLView demo
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programs. They should have been compiled along with the Mesa
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library.
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* GLUT
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A beta version of GLUT 3.7 port for BeOS can be found at
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http://anobject.com/jehamby/Code/Glut-3.7-x86.zip.
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There's is a 2.5 version in src-glut.beos/, too.
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The original distribution can be obtained from
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http://home.beoscentral.com/jehamby/Glut-3.5-x86.zip
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They are special version of GLUT adapted for the BeOS. I don't
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believe Mark Kilgard's normal GLUT distribution includes BeOS
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support.
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* Special Features
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Mesa's implementation of the BGLView class has an extra member
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function: CopySubBufferMESA(). It basically works like SwapBuffers()
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but it only copies a sub region from the back buffer to the front
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buffer. This is a useful optimization for some applications.
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If you use this method in your code be sure that you check at runtime
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that you're actually using Mesa (with glGetString) so you don't
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cause a fatal error when running with Be's OpenGL.
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* Work Left To Do
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BDirectWindow single buffering support is not implemented yet.
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Color index mode is not implemented yet.
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Reading pixels from the front buffer not implemented yet.
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There is also a BGLScreen class in BeOS for full-screen OpenGL
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rendering. This should also be implemented for Mesa.
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* Old BeOS Driver
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Mesa 2.6 had an earlier BeOS driver. It was based on Mesa's Off-screen
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rendering interface, not BGLView. If you're interested in the older
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driver you should get Mesa 2.6.
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* BeOS and Glide
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Mesa 3.0 supported the 3Dfx/Glide library on Beos. Download Mesa 3.0
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if interested. Ideally, the 3Dfx/Glide support should be updated to
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work with the new Mesa 3.1 BGLView implementation.
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The Glide library hasn't been updated for BeOS R4 and newer, to my knowledge, as
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of February, 1999.
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----------------------------------------------------------------------
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$Id: README.BEOS,v 1.8 2003/12/13 01:26:14 brianp Exp $
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