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Amiga MA Magazine 1998 #6
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amigamamagazinepolishissue1998.iso
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coders
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mesa-1.2.8
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include
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gl
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osmesa.h
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1996-05-27
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/* $Id: osmesa.h,v 1.1 1995/10/12 16:44:12 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 1.2
* Copyright (C) 1995 Brian Paul (brianp@ssec.wisc.edu)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
$Log: osmesa.h,v $
* Revision 1.1 1995/10/12 16:44:12 brianp
* Initial revision
*
*/
/*
* Mesa Off-Screen rendering interface.
*
* This is an operating system and window system independent interface to
* Mesa which allows one to render images into a client-supplied buffer in
* main memory. Such images may manipulated or saved in whatever way the
* client wants.
*
* There are only three API functions:
* 1. OSMesaCreateContext - create a new Off-Screen Mesa rendering context
* 2. OSMesaMakeCurrent - bind an OSMesaContext to a client's image buffer
* and make the specified context the current one.
* 3. OSMesaDestroyContext - destroy an OSMesaContext
*
*
* The limits on the width and height of an image buffer are MAX_WIDTH and
* MAX_HEIGHT as defined in Mesa/src/config.h. Defaults are 1280 and 1024.
* You can increase them as needed but beware that many temporary arrays in
* Mesa are dimensioned by MAX_WIDTH or MAX_WIDTH.
*/
#ifndef OSMESA_H
#define OSMESA_H
#ifdef __cplusplus
extern "C" {
#endif
#include "GL/gl.h"
typedef struct osmesa_context *OSMesaContext;
/*
* Create an Off-Screen Mesa rendering context. The only attribute needed is
* an RGBA vs Color-Index mode flag.
*
* Input: format - either GL_RGBA or GL_COLOR_INDEX
* sharelist - specifies another OSMesaContext with which to share
* display lists. NULL indicates no sharing.
* Return: an OSMesaContext or 0 if error
*/
extern OSMesaContext OSMesaCreateContext( GLenum format,
OSMesaContext sharelist );
/*
* Destroy an Off-Screen Mesa rendering context.
*
* Input: ctx - the context to destroy
*/
extern void OSMesaDestroyContext( OSMesaContext ctx );
/*
* Bind an OSMesaContext to an image buffer. The image buffer is just a
* block of memory which the client provides. Its size must be at least
* as large as width*height*sizeof(type). Its address should be a multiple
* of 4 if using RGBA mode.
*
* Image data is stored in the order of glDrawPixels: row-major order
* with the lower-left image pixel stored in the first array position
* (ie. bottom-to-top).
*
* Since the only type initially supported is GL_UNSIGNED_BYTE, if the
* context is in RGBA mode, each pixel will be stored as a 4-byte RGBA
* value. If the context is in color indexed mode, each pixel will be
* stored as a 1-byte value.
*
* If the context's viewport hasn't been initialized yet, it will now be
* initialized to (0,0,width,height).
*
* Input: ctx - the rendering context
* buffer - the image buffer memory
* type - data type for pixel components, only GL_UNSIGNED_BYTE
* supported now
* width, height - size of image buffer in pixels, at least 1
* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
* invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
* width>internal limit or height>internal limit.
*/
extern GLboolean OSMesaMakeCurrent( OSMesaContext ctx,
void *buffer, GLenum type,
GLsizei width, GLsizei height );
#ifdef __cplusplus
}
#endif
#endif