docs/README.BEOS - platform/external/mesa3d - Gitiles


                          Mesa / BeOS Information


 * Introduction

 Brian Paul added in Mesa 3.1 a driver for BeOS R4.5 operating system.
 This driver implements a clone of the BGLView class.  This class,
 derived from BView, allows OpenGL rendering into any BeOS window.  His
 driver was updated in Mesa 4.1 and again in version 6.1 by Philippe
 Houdoin, who's maintaining this driver since.

 Any application which uses the BGLView should be able to use Mesa
 instead of Be's OpenGL without changing any code.

 Since Be's OpenGL implementation (as of R5) is basically just the
 SGI sample implementation, it's pretty slow.  You'll see that Mesa
 is considerably faster.


 * Source Code

 The source code for the driver is in src/mesa/drivers/beos/ directory.
 It's not 100% finished at this time but many GLUT-based demos are
 working.  No optimizations have been made at this time.


 * Compiling

 Since Mesa 6.x, it can be build under BeOS with both the R5 builtin gcc version
 or more recent gcc versions available for BeOS, like this gcc version 2.95.3 for BeOS
 you can find at http://www.bebits.com/app/2157.
 Anyway, keep in mind that to take full advantage of Mesa x86 optimizations, you better
 want to use gcc 2.95.3 or sooner versions...

 To build Mesa-powered BeOS libGL.so version, open an Terminal window,
 move to Mesa root folder and type this command:

 $ make beos

 Note that the "beos" argument is only needed the first time to setup build config.
 Next times, typing "make" will be enough.

 When it finishes the Mesa based libGL.so library for
 BeOS will be in the lib/ directory, along libglut.so library.
 Several demo/test programs should have been build too under progs/* folders.
 If it stop when building one of the progs/* programs, you may want to ignore it
 and force make to move on next target by adding the -k make option:

 $ cd progs
 $ make -k

 To install it as Be's default libGL.so replacement, put it in your
 /boot/home/config/lib/ directory. All your GL/GLUT apps will use
 the Mesa based then.

 By default, it build a non-debug version library.
 The x86 (MMX, SSE and 3DNOW) optimizations are also supported for x86 target.
 For PowerPC BeOS flavor, sorry, Mesa don't have ppc (Altivec) optimizations
 yet.

 To build a DEBUG version, type instead this :

 $ DEBUG=1 make


 * Example Programs

 Look under progs/beos/ for some BGLView-based programs.
 You should find under progs/samples and progs/redbook directories GLUT-based programs too.
 They all should have been compiled along with the Mesa library.


 * GLUT

 A beta version of GLUT 3.7 port for BeOS, made by Jake Hamby, can be found at
 http://anobject.com/jehamby/Code/Glut-3.7-x86.zip.
 This is the version currently included in Mesa source code, and
 build in lib/libglut.so.

 A previous 3.5 version of this GLUT BeOS port used to be available at
 http://home.beoscentral.com/jehamby/Glut-3.5-x86.zip.

 They're special versions of GLUT for the BeOS platform.  I don't
 believe Mark Kilgard's normal GLUT distribution includes BeOS
 support.


 * Special Features

 Mesa's implementation of the BGLView class has an extra member
 function:  CopySubBufferMESA().  It basically works like SwapBuffers()
 but it only copies a sub region from the back buffer to the front
 buffer.  This is a useful optimization for some applications.
 If you use this method in your code be sure that you check at runtime
 that you're actually using Mesa (with glGetString) so you don't
 cause a fatal error when running with Be's OpenGL.


 * Work Left To Do

 - BDirectWindow single buffering support is not implemented yet.
 - Color index mode is not implemented yet.
 - Reading pixels from the front buffer not implemented yet.
 - There is also a BGLScreen class in BeOS for full-screen OpenGL rendering.
   This should also be implemented for Mesa.
 - Multiple renderers add-ons support, first step toward hardware acceleration
   support.

 * Other contributors to this BeOS port

 Jake Hamby                      jhamby <at> anobject <dot> com
 Marcin Konicki                  ahwayakchih <at> neoni <dot> net
 Francois Revol                  revol <at> free <dot> fr
 Nathan Whitehorn                nathanw <at> uchicago <dot> edu


 * Older BeOS Driver

 Mesa 2.6 had an earlier BeOS driver.  It was based on Mesa's Off-screen
 rendering interface, not BGLView.  If you're interested in the older
 driver you should get Mesa 2.6.


 * BeOS and Glide

 Mesa 3.0 supported the 3Dfx/Glide library on Beos.  Download Mesa 3.0
 if interested.  Ideally, the 3Dfx/Glide support should be updated to
 work with the new Mesa 3.1 BGLView implementation.

 The Glide library hasn't been updated for BeOS R4 and newer, to my knowledge,
 as of February, 1999.


 ----------------------------------------------------------------------

	Mesa / BeOS Information



	* Introduction

	Brian Paul added in Mesa 3.1 a driver for BeOS R4.5 operating system.
	This driver implements a clone of the BGLView class. This class,
	derived from BView, allows OpenGL rendering into any BeOS window. His
	driver was updated in Mesa 4.1 and again in version 6.1 by Philippe
	Houdoin, who's maintaining this driver since.

	Any application which uses the BGLView should be able to use Mesa
	instead of Be's OpenGL without changing any code.

	Since Be's OpenGL implementation (as of R5) is basically just the
	SGI sample implementation, it's pretty slow. You'll see that Mesa
	is considerably faster.


	* Source Code

	The source code for the driver is in src/mesa/drivers/beos/ directory.
	It's not 100% finished at this time but many GLUT-based demos are
	working. No optimizations have been made at this time.


	* Compiling

	Since Mesa 6.x, it can be build under BeOS with both the R5 builtin gcc version
	or more recent gcc versions available for BeOS, like this gcc version 2.95.3 for BeOS
	you can find at http://www.bebits.com/app/2157.
	Anyway, keep in mind that to take full advantage of Mesa x86 optimizations, you better
	want to use gcc 2.95.3 or sooner versions...

	To build Mesa-powered BeOS libGL.so version, open an Terminal window,
	move to Mesa root folder and type this command:

	$ make beos

	Note that the "beos" argument is only needed the first time to setup build config.
	Next times, typing "make" will be enough.

	When it finishes the Mesa based libGL.so library for
	BeOS will be in the lib/ directory, along libglut.so library.
	Several demo/test programs should have been build too under progs/* folders.
	If it stop when building one of the progs/* programs, you may want to ignore it
	and force make to move on next target by adding the -k make option:

	$ cd progs
	$ make -k

	To install it as Be's default libGL.so replacement, put it in your
	/boot/home/config/lib/ directory. All your GL/GLUT apps will use
	the Mesa based then.

	By default, it build a non-debug version library.
	The x86 (MMX, SSE and 3DNOW) optimizations are also supported for x86 target.
	For PowerPC BeOS flavor, sorry, Mesa don't have ppc (Altivec) optimizations
	yet.

	To build a DEBUG version, type instead this :

	$ DEBUG=1 make


	* Example Programs

	Look under progs/beos/ for some BGLView-based programs.
	You should find under progs/samples and progs/redbook directories GLUT-based programs too.
	They all should have been compiled along with the Mesa library.


	* GLUT

	A beta version of GLUT 3.7 port for BeOS, made by Jake Hamby, can be found at
	http://anobject.com/jehamby/Code/Glut-3.7-x86.zip.
	This is the version currently included in Mesa source code, and
	build in lib/libglut.so.

	A previous 3.5 version of this GLUT BeOS port used to be available at
	http://home.beoscentral.com/jehamby/Glut-3.5-x86.zip.

	They're special versions of GLUT for the BeOS platform. I don't
	believe Mark Kilgard's normal GLUT distribution includes BeOS
	support.


	* Special Features

	Mesa's implementation of the BGLView class has an extra member
	function: CopySubBufferMESA(). It basically works like SwapBuffers()
	but it only copies a sub region from the back buffer to the front
	buffer. This is a useful optimization for some applications.
	If you use this method in your code be sure that you check at runtime
	that you're actually using Mesa (with glGetString) so you don't
	cause a fatal error when running with Be's OpenGL.


	* Work Left To Do

	- BDirectWindow single buffering support is not implemented yet.
	- Color index mode is not implemented yet.
	- Reading pixels from the front buffer not implemented yet.
	- There is also a BGLScreen class in BeOS for full-screen OpenGL rendering.
	This should also be implemented for Mesa.
	- Multiple renderers add-ons support, first step toward hardware acceleration
	support.

	* Other contributors to this BeOS port

	Jake Hamby jhamby <at> anobject <dot> com
	Marcin Konicki ahwayakchih <at> neoni <dot> net
	Francois Revol revol <at> free <dot> fr
	Nathan Whitehorn nathanw <at> uchicago <dot> edu


	* Older BeOS Driver

	Mesa 2.6 had an earlier BeOS driver. It was based on Mesa's Off-screen
	rendering interface, not BGLView. If you're interested in the older
	driver you should get Mesa 2.6.


	* BeOS and Glide

	Mesa 3.0 supported the 3Dfx/Glide library on Beos. Download Mesa 3.0
	if interested. Ideally, the 3Dfx/Glide support should be updated to
	work with the new Mesa 3.1 BGLView implementation.

	The Glide library hasn't been updated for BeOS R4 and newer, to my knowledge,
	as of February, 1999.


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