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Amiga MA Magazine 1998 #6
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1996-05-27
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Short: 3D library, OpenGL based, Amiga v1.0
Uploader: d94sz@efd.lth.se (Stefan Zivkovic)
Author: brianp@ssec.wisc.edu (BrianP) Amiga Port: d94sz@efd.lth.se (Stefan Zivkovic)
Type: dev/c
Requires: System v39, SAS C Compiler
Version: Mesa v1.2.8 Amiga version 1.0
The Mesa 3-D graphics library
Version 1.2.8
Copyright (C) 1995-1996 Brian Paul
Introduction
============
Mesa is a 3-D graphics library with an API which is very similar to that
of OpenGL*. To the extent that Mesa utilizes the OpenGL command syntax
or state machine, it is being used with authorization from Silicon Graphics,
Inc. However, the author makes no claim that Mesa is in any way a
compatible replacement for OpenGL or associated with Silicon Graphics, Inc.
Those who want a licensed implementation of OpenGL should contact a licensed
vendor. This software is distributed under the terms of the GNU Library
General Public License, see the LICENSE file for details.
* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
Miscellaneous
=============
There is a Amiga Mesa WWW page: http://www.efd.lth.se/~d94sz/amesa
and the orginal Mesa WWW page: http://www.ssec.wisc.edu/~brianp/Mesa.html
Since the OpenGL API is used, OpenGL documentation can serve as the
documentation for Mesa's core functions. Here are a few sources:
Man pages: http://www.digital.com:80/pub/doc/opengl/
Spec doc: http://www.sgi.com/Technology/openGL/glspec/glspec.html
Author
======
Brian Paul
Space Science and Engineering Center
University of Wisconsin - Madison
1225 W. Dayton St.
Madison, WI 53706
brianp@ssec.wisc.edu
AMIGA PORT of MESA: THE OPENGL SOFTWARE EMULATION by Stefan Zivkovic
====================================================================
When I first read about OPENGL in the summer of 1995 I was happy and filled with
joy. A few days later I surfed to the mesa homepage but only to discover that
there was no Amiga version. In the beginning of 1996 someone released a AMIWIN
version so I took the archive home to try it out, but it stayed packed on my HD.
One day when I was home and poking around with my HD I saw the archive and
started to try to make it work. Without luck as it seemed that you needed
the AMIWIN Includes and LIBFILES. But I also discovered that it was possible
to port it with not to much effort (WRONG THERE) so I begun.
For the Amiga there is only three important files + one directory.
src/Amigamesa.c The mesa GL Amiga implementation
(ddsample.c with some Amiga code)
src-tk/Awindow.c The tk (and aux) machine specific code)
include/GL/Amigamesa.h The prototypes for Amigamesa
Amiga/#?
Compiling
=========
Just execute mklib.amiga
About the code.
===============
The common scoptions file is in /Amiga
In /Amiga there is previews of files to the shared-library version
(This don't work yet but should give you an idea of how to use it)
In /Amiga/Examles there is some amiga-demo codes.
The Code is compiled with cpu=020 math=ieee
If you would like it different then use the /Amiga/scoptions and if you change
the math you have to change it to link with it in all smakefile
All pen allocations are made with obtain best pen. So if you alloc 256 pens
in a 2-depth screen your will loose some colour but the code should work.
In this state it only renders on a window on a up-to 256 col display but I
have planes to port it to CyberGFX the problem is that I don't own a gfx-card
so this is very low on my priority list, this could change if I had one :)
all tk actions in tkExec are not finished.
but most of them is
Most of the examples work.
etc. etc.
Write your own OpenGL code
==========================
1. For a easy start look at the examples in book and modify them
until The shared library is ready you have to define AMIGALIB when
using <GL/gl.h>
2. For a better amigaproggy just open a window (on your favourite screen) and
add a few lines in your source:
-----------------------------------------------------------------------------
/* ADD where you want it */
#include <GL/gl.h>
Init() /* sets up viewport and projections */
{
glMatrixMode (GL_PROJECTION); /* prepare for and then */
glLoadIdentity (); /* define the projection */
glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 20.0);/* transformation */
glMatrixMode (GL_MODELVIEW); /* back to modelview matrix*/
glViewport (0, 0, 200, 200); /* define the viewport */
} /* ^ ^ ^^^ ^^^--- The size of the mesa/openGL window */
/* ADD In after you opened your window */
struct amigamesa_context *glcont;
glcont=AmigaMesaCreateContext(My window pointer,GL_FALSE,GL_FALSE);
/* your windowprt,RGB-mode,doublebuffered */
if (glcont)
{
AmigaMesaMakeCurrent(glcont);
Init();
/* All your ourrage gl comands */
/*handle_window_events(test_window); or whatever */
AmigaMesaDestroyContext(glcont);
}
/* Don't forget to call glViewport() when you resize the window */
------------------------------------------------------------------------------
if you set doublebuff to GL_TRUE then you just switch buffer with
AmigaMesaSwapBuffers();
For more info of the internal you can check the files
src/Amigamesa.c and include/GL/Amigamesa.h for tk check src-tk/Awindow.c
LATEST VERSION:
===============
http://www.efd.lth.se/~d94sz/amesa
FUTURE:
=======
The API will probably change a little.( Long names -> shorter ex
AmigaMesaDestroyContext renames to MesaDestroyContext...)
Now GLDouble is float due to shared library registers and that's not good.
A shared library would be nice. (I have started)
Faster and better. (I have a few ideas)
CyberGFX support. (I don't have CyberGFX myself any offer to
give me one would result in CyberGFX support :)
HISTORY:
========
Release:
0.8 This code worked with Mesa 1.2.6 and all makefiles also.
Due to when I released it Mesa 1.2.7 was released and some changes was made
it didn't work.
0.9 Makefiles is remapped to work with Mesa 1.2.7.
Double buffering works.
Implemented fast_poly_draw (big speed improvement).
tkExec a few more tests were done. (right & middle mousebutton is not
implemented)
1.0 I've put a common scoption file in /Amiga (thanks to Kamil Iskra).
Due to the common scoptions you could change CPU and math more easy ,and
compiler options set to default math=ieee, cpu=020 so that it works on
1200's and up
Many bugfixes (thanks to Daniel Jönsson).
Have fixed the smakefile name collision with AMIWIN version.
Mesa 1.2.8 Fixed.
Spellcorrection of the docs were made by Peter Sandén.
All tk's windows are opened on a pubscreen named "MESA" if it exists.
Please contact me with suggestions and additional info.
You can reach me at:
d94sz@efd.lth.se
Or mail:
Stefan Zivkovic
Kämnärsv. 2:216
226 45 LUND
+46 46 396997