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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;
- }
- }
- }
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