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- /* -------------------------------------------------------------------------- *\
- ZBITMAP24.CPP, a BitMap24 subclass which introduces simple Z-Buffering
- Copyright (C) 1999 Jarno van der Linden
- jarno@kcbbs.gen.nz
-
- 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., 59 Temple Place - Suite 330, Cambridge,
- MA 02139, USA.
-
-
- 01 May 1999: Brought it all together in some sort of distributable form
- \* -------------------------------------------------------------------------- */
-
- /* -------------------------------- Includes -------------------------------- */
- #include <string.h>
-
- #include "zbitmap24.h"
-
- /* ------------------------------ Definitions ------------------------------- */
-
- /* --------------------------------- Macros --------------------------------- */
-
- /* -------------------------------- Typedefs -------------------------------- */
-
- /* ------------------------------ Proto Types ------------------------------- */
-
- /* -------------------------------- Structs --------------------------------- */
-
- /* -------------------------------- Globals --------------------------------- */
-
- /* ---------------------------------- Code ---------------------------------- */
- ZBitMap24::ZBitMap24()
- : BitMap24()
- {
- zbuffer = NULL;
- }
-
-
- ZBitMap24::~ZBitMap24()
- {
- if(zbuffer)
- delete[] zbuffer;
- zbuffer = NULL;
- }
-
-
- char *ZBitMap24::GetErrorStr(int error)
- {
- switch(error)
- {
- case ZBITMAP24_ERROR_NOZBUFFER:
- return("Z-Buffer couldn't be allocated\n");
- }
-
- return BitMap24::GetErrorStr(error);
- }
-
-
- char *ZBitMap24::GetErrorStr()
- {
- return BitMap24::GetErrorStr();
- }
-
-
- void ZBitMap24::SetMaxZ(double maxz_arg)
- {
- UWORD z;
- UWORD *zb;
-
- maxz = maxz_arg;
- if(maxz > 0.0)
- mul = 65535.0/log(maxz+1.0);
- else
- mul = 0.0;
-
- z = GetBufferZ(maxz);
- zb = zbuffer;
- for(int t=GetWidthFast()*GetHeightFast()-1; t>=0;t--)
- *(zb++) = z;
- }
-
-
- void ZBitMap24::SetColour(UBYTE r,UBYTE g,UBYTE b,double z,int x,int y)
- {
- if(BoundsCheck(x,y))
- SetColourFast(r,g,b,z,x,y);
- }
-
-
- void ZBitMap24::SetColour(const Colour &c,double z,int x,int y)
- {
- if(BoundsCheck(x,y))
- SetColourFast(c,z,x,y);
- }
-
-
- void ZBitMap24::SetSize(UWORD width_arg, UWORD height_arg)
- {
- UWORD width,height;
-
- if(zbuffer)
- delete[] zbuffer;
- zbuffer = NULL;
-
- BitMap24::SetSize(width_arg,height_arg);
-
- width = GetWidthFast();
- height = GetHeightFast();
-
- zbuffer = new UWORD[width*height];
- if(zbuffer)
- SetMaxZ(1.0);
- else
- SetError(ZBITMAP24_ERROR_NOZBUFFER);
- }
-