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Amiga ACS 1998 #6
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amigaacscoverdisc1998-061998.iso
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descent
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2d
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scanline.c
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1998-06-08
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/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
*/
/*
* $Source: f:/miner/source/2d/rcs/scanline.c $
* $Revision: 1.7 $
* $Author: john $
* $Date: 1994/11/18 22:50:48 $
*
* Graphical routines for drawing solid scanlines.
*
* $Log: scanline.c $
* Revision 1.7 1994/11/18 22:50:48 john
* Changed a bunch of shorts to ints in calls.
*
* Revision 1.6 1994/09/02 11:40:32 john
* fixed bug with urect scanline drakening still
* only using 16 levels of fade.
*
* Revision 1.5 1994/04/08 16:59:12 john
* Add fading poly's; Made palette fade 32 instead of 16.
*
* Revision 1.4 1994/03/22 18:36:27 john
* Added darkening scanlines
*
* Revision 1.3 1993/10/15 16:22:52 john
* y
*
* Revision 1.2 1993/09/08 11:56:29 john
* neatened
*
* Revision 1.1 1993/09/08 11:44:27 john
* Initial revision
*
*
*/
#include "mem.h"
#include "gr.h"
#include "grdef.h"
int Gr_scanline_darkening_level = GR_FADE_LEVELS;
void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table );
#pragma aux gr_linear_darken parm [edi] [eax] [ecx] [edx] modify exact [eax ebx ecx edx edi] = \
" xor ebx, ebx " \
" mov bh, al " \
"gld_loop: mov bl, [edi] " \
" mov al, [ebx+edx] " \
" mov [edi], al " \
" inc edi " \
" dec ecx " \
" jnz gld_loop "
void gr_uscanline( int x1, int x2, int y )
{
if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
switch(TYPE)
{
case BM_LINEAR:
gr_linear_stosd( DATA + ROWSIZE*y + x1, COLOR, x2-x1+1);
break;
case BM_MODEX:
gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
case BM_SVGA:
gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
}
} else {
switch(TYPE)
{
case BM_LINEAR:
gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
break;
case BM_MODEX:
gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
case BM_SVGA:
gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
}
}
}
void gr_scanline( int x1, int x2, int y )
{
if ((y<0)||(y>MAXY)) return;
if (x2 < x1 ) x2 ^= x1 ^= x2;
if (x1 > MAXX) return;
if (x2 < MINX) return;
if (x1 < MINX) x1 = MINX;
if (x2 > MAXX) x2 = MAXX;
if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
switch(TYPE)
{
case BM_LINEAR:
gr_linear_stosd( DATA + ROWSIZE*y + x1, COLOR, x2-x1+1);
break;
case BM_MODEX:
gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
case BM_SVGA:
gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
}
} else {
switch(TYPE)
{
case BM_LINEAR:
gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
break;
case BM_MODEX:
gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
case BM_SVGA:
gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
break;
}
}
}