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/* $Id: tr.h,v 1.7 2018/04/28 21:40:58 plm Exp $ */
/*
* $originalLog: tr.h,v $
* Revision 1.5 1997/07/21 17:34:07 brianp
* added tile borders, incremented version to 1.1
*
* Revision 1.4 1997/07/21 15:47:35 brianp
* renamed all "near" and "far" variables
*
* Revision 1.3 1997/04/26 21:23:25 brianp
* added trRasterPos3f function
*
* Revision 1.2 1997/04/19 23:26:10 brianp
* many API changes
*
* Revision 1.1 1997/04/18 21:53:05 brianp
* Initial revision
*
*/
/*
* Tiled Rendering library
* Version 1.1
* Copyright (C) 1997 Brian Paul
*
* 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* Notice added by Russ Allbery on 2013-07-21 based on the license information
* in tr-1.3.tar.gz retrieved from <http://www.mesa3d.org/brianp/TR.html>.
*
*
* This library allows one to render arbitrarily large images with OpenGL.
* The basic idea is to break the image into tiles which are rendered one
* at a time. The tiles are assembled together to form the final, large
* image. Tiles and images can be of any size.
*
* Basic usage:
*
* 1. Allocate a tile rendering context:
* TRcontext t = trNew();
*
* 2. Specify the final image buffer and tile size:
* GLubyte image[W][H][4]
* trImageSize(t, W, H);
* trImageBuffer(t, GL_RGBA, GL_UNSIGNED_BYTE, (GLubyte *) image);
*
* 3. Setup your projection:
* trFrustum(t, left, right, bottom top, near, far);
* or
* trOrtho(t, left, right, bottom top, near, far);
* or
* trPerspective(t, fovy, aspect, near, far);
*
* 4. Render the tiles:
* do {
* trBeginTile(t);
* DrawMyScene();
* } while (trEndTile(t));
*
* You provide the DrawMyScene() function which calls glClear() and
* draws all your stuff.
*
* 5. The image array is now complete. Display it, write it to a file, etc.
*
* 6. Delete the tile rendering context when finished:
* trDelete(t);
*
*/
#ifndef TR_H
#define TR_H
#ifdef __cplusplus
extern "C" {
#endif
#define TR_VERSION "1.1"
#define TR_MAJOR_VERSION 1
#define TR_MINOR_VERSION 1
typedef struct _TRctx TRcontext;
typedef enum {
TR_TILE_WIDTH = 100,
TR_TILE_HEIGHT,
TR_TILE_BORDER,
TR_IMAGE_WIDTH,
TR_IMAGE_HEIGHT,
TR_ROWS,
TR_COLUMNS,
TR_CURRENT_ROW,
TR_CURRENT_COLUMN,
TR_CURRENT_TILE_WIDTH,
TR_CURRENT_TILE_HEIGHT,
TR_ROW_ORDER,
TR_TOP_TO_BOTTOM,
TR_BOTTOM_TO_TOP
} TRenum;
extern TRcontext *trNew(void);
extern void trDelete(TRcontext * tr);
extern void trTileSize(TRcontext * tr, GLint width, GLint height, GLint border);
#if 0
extern void trTileBuffer(TRcontext * tr, GLenum format, GLenum type, GLvoid * image);
#endif
extern void trImageSize(TRcontext * tr, GLuint width, GLuint height);
extern void trImageBuffer(TRcontext * tr, GLenum format, GLenum type, GLvoid * image);
#if 0
extern void trRowOrder(TRcontext * tr, TRenum order);
extern GLint trGet(const TRcontext * tr, TRenum param);
#endif
extern void trOrtho(TRcontext * tr,
GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble znear, GLdouble zfar);
extern void trFrustum(TRcontext * tr,
GLdouble left, GLdouble right,
GLdouble bottom, GLdouble top, GLdouble znear, GLdouble zfar);
#if 0
extern void trPerspective(TRcontext * tr, GLdouble fovy, GLdouble aspect, GLdouble zNearx, GLdouble zFarx);
#endif
extern void trBeginTile(TRcontext * tr);
extern int trEndTile(TRcontext * tr);
#if 0
extern void trRasterPos3d(const TRcontext * tr, GLdouble x, GLdouble y, GLdouble z);
#endif
#ifdef __cplusplus
}
#endif
#endif
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