376 lines
9.7 KiB
C
376 lines
9.7 KiB
C
/* $Id: 2dsline.c,v 1.10 2003-04-29 08:05:41 btb Exp $ */
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/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Graphical routines for drawing solid scanlines.
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*
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* Old Log:
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* Revision 1.6 1995/09/14 14:24:03 allender
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* fixed MW compile error
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*
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* Revision 1.5 1995/09/14 13:45:17 allender
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* quick optimization for scanline
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*
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* Revision 1.4 1995/04/27 07:36:05 allender
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* remove some memsets since all old is here now
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*
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* Revision 1.3 1995/04/19 14:35:33 allender
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* *** empty log message ***
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*
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* Revision 1.2 1995/04/18 12:03:40 allender
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* *** empty log message ***
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*
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* Revision 1.1 1995/03/09 09:24:06 allender
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* Initial revision
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*
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*
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* --- PC RCS information ---
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* Revision 1.7 1994/11/18 22:50:48 john
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* Changed a bunch of shorts to ints in calls.
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*
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* Revision 1.6 1994/09/02 11:40:32 john
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* fixed bug with urect scanline drakening still
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* only using 16 levels of fade.
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*
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* Revision 1.5 1994/04/08 16:59:12 john
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* Add fading poly's; Made palette fade 32 instead of 16.
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*
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* Revision 1.4 1994/03/22 18:36:27 john
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* Added darkening scanlines
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*
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* Revision 1.3 1993/10/15 16:22:52 john
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* y
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*
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* Revision 1.2 1993/09/08 11:56:29 john
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* neatened
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*
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* Revision 1.1 1993/09/08 11:44:27 john
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* Initial revision
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <conf.h>
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#endif
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#include <string.h>
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#include "u_mem.h"
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#include "gr.h"
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#include "grdef.h"
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#include "error.h"
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#ifdef __MSDOS__
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#include "modex.h"
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#include "vesa.h"
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#endif
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#if defined(POLY_ACC)
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#include "poly_acc.h"
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#endif
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int Gr_scanline_darkening_level = GR_FADE_LEVELS;
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#if !defined(NO_ASM) && defined(__WATCOMC__)
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void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table );
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#pragma aux gr_linear_darken parm [edi] [eax] [ecx] [edx] modify exact [eax ebx ecx edx edi] = \
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" xor ebx, ebx " \
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" mov bh, al " \
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"gld_loop: mov bl, [edi] " \
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" mov al, [ebx+edx] " \
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" mov [edi], al " \
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" inc edi " \
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" dec ecx " \
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" jnz gld_loop "
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#elif !defined(NO_ASM) && defined(__GNUC__)
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static inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table ) {
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int dummy[4];
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__asm__ __volatile__ (
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" xorl %%ebx, %%ebx;"
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" movb %%al, %%bh;"
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"0: movb (%%edi), %%bl;"
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" movb (%%ebx, %%edx), %%al;"
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" movb %%al, (%%edi);"
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" incl %%edi;"
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" decl %%ecx;"
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" jnz 0b"
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: "=D" (dummy[0]), "=a" (dummy[1]), "=c" (dummy[2]), "=d" (dummy[3])
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: "0" (dest), "1" (darkening_level), "2" (count), "3" (fade_table)
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: "%ebx");
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}
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#elif !defined(NO_ASM) && defined(_MSC_VER)
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__inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table )
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{
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__asm {
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mov edi,[dest]
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mov eax,[darkening_level]
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mov ecx,[count]
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mov edx,[fade_table]
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xor ebx, ebx
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mov bh, al
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gld_loop:
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mov bl,[edi]
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mov al,[ebx+edx]
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mov [edi],al
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inc edi
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dec ecx
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jnz gld_loop
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}
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}
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#else // Unknown compiler, or no assembler. So we use C.
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void gr_linear_darken(ubyte * dest, int darkening_level, int count, ubyte * fade_table) {
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register int i;
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for (i=0;i<count;i++)
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{
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*dest = fade_table[(*dest)+(darkening_level*256)];
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dest++;
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}
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}
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#endif
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#ifdef NO_ASM // No Assembler. So we use C.
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#if 0
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void gr_linear_stosd( ubyte * dest, ubyte color, unsigned short count )
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{
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int i, x;
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if (count > 3) {
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while ((int)(dest) & 0x3) { *dest++ = color; count--; };
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if (count >= 4) {
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x = (color << 24) | (color << 16) | (color << 8) | color;
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while (count > 4) { *(int *)dest = x; dest += 4; count -= 4; };
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}
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while (count > 0) { *dest++ = color; count--; };
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} else {
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for (i=0; i<count; i++ )
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*dest++ = color;
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}
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}
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#else
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void gr_linear_stosd( ubyte * dest, unsigned char color, unsigned int nbytes) {
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memset(dest,color,nbytes);
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}
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#endif
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#endif
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#if defined(POLY_ACC)
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//$$ Note that this code WAS a virtual clone of the mac code and any changes to mac should be reflected here.
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void gr_linear15_darken( short * dest, int darkening_level, int count, ubyte * fade_table )
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{
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//$$ this routine is a prime candidate for using the alpha blender.
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int i;
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unsigned short rt[32], gt[32], bt[32];
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unsigned long level, int_level, dlevel;
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dlevel = (darkening_level << 16) / GR_FADE_LEVELS;
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level = int_level = 0;
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for(i = 0; i != 32; ++i)
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{
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rt[i] = int_level << 10;
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gt[i] = int_level << 5;
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bt[i] = int_level;
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level += dlevel;
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int_level = level >> 16;
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}
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pa_flush();
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for (i=0; i<count; i++ ) {
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if(*dest & 0x8000)
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*dest =
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rt[((*dest >> 10) & 0x1f)] |
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gt[((*dest >> 5) & 0x1f)] |
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bt[((*dest >> 0) & 0x1f)] |
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0x8000;
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dest++;
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}
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}
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void gr_linear15_stosd( short * dest, ubyte color, unsigned short count )
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{
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//$$ this routine is a prime candidate for using the alpha blender.
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short c = pa_clut[color];
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pa_flush();
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while(count--)
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*dest++ = c;
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}
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#endif
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void gr_uscanline( int x1, int x2, int y )
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{
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if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
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switch(TYPE)
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{
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case BM_LINEAR:
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#ifdef OGL
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case BM_OGL:
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#endif
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gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
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break;
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#ifdef __MSDOS__
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case BM_MODEX:
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gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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case BM_SVGA:
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gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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#endif
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#if defined(POLY_ACC)
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case BM_LINEAR15:
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gr_linear15_stosd( (short *)(DATA + ROWSIZE*y + x1 * PA_BPP), COLOR, x2-x1+1);
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break;
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#endif
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}
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} else {
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switch(TYPE)
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{
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case BM_LINEAR:
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#ifdef OGL
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case BM_OGL:
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#endif
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gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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break;
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#ifdef __MSDOS__
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case BM_MODEX:
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gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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case BM_SVGA:
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#if 1
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{
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ubyte * vram = (ubyte *)0xA0000;
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int VideoLocation,page,offset1, offset2;
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VideoLocation = (ROWSIZE * y) + x1;
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page = VideoLocation >> 16;
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offset1 = VideoLocation & 0xFFFF;
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offset2 = offset1 + (x2-x1+1);
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gr_vesa_setpage( page );
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if ( offset2 <= 0xFFFF ) {
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gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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} else {
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gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
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page++;
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gr_vesa_setpage(page);
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gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
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}
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}
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#else
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gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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#endif
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break;
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#endif
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#if defined(POLY_ACC)
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case BM_LINEAR15:
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gr_linear15_darken( (short *)(DATA + ROWSIZE*y + x1 * PA_BPP), Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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break;
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#endif
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}
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}
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}
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void gr_scanline( int x1, int x2, int y )
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{
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if ((y<0)||(y>MAXY)) return;
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if (x2 < x1 ) x2 ^= x1 ^= x2;
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if (x1 > MAXX) return;
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if (x2 < MINX) return;
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if (x1 < MINX) x1 = MINX;
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if (x2 > MAXX) x2 = MAXX;
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if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
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switch(TYPE)
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{
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case BM_LINEAR:
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#ifdef OGL
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case BM_OGL:
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#endif
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gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
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break;
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#ifdef __MSDOS__
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case BM_MODEX:
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gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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case BM_SVGA:
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gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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#endif
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#if defined(POLY_ACC)
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case BM_LINEAR15:
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gr_linear15_stosd( (short *)(DATA + ROWSIZE*y + x1 * PA_BPP), COLOR, x2-x1+1);
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break;
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#endif
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}
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} else {
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switch(TYPE)
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{
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case BM_LINEAR:
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#ifdef OGL
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case BM_OGL:
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#endif
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gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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break;
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#ifdef __MSDOS__
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case BM_MODEX:
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gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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break;
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case BM_SVGA:
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#if 1
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{
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ubyte * vram = (ubyte *)0xA0000;
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int VideoLocation,page,offset1, offset2;
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VideoLocation = (ROWSIZE * y) + x1;
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page = VideoLocation >> 16;
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offset1 = VideoLocation & 0xFFFF;
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offset2 = offset1 + (x2-x1+1);
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gr_vesa_setpage( page );
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if ( offset2 <= 0xFFFF ) {
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gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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} else {
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gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
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page++;
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gr_vesa_setpage(page);
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gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
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}
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}
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#else
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gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
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#endif
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break;
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#endif
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#if defined(POLY_ACC)
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case BM_LINEAR15:
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gr_linear15_darken( (short *)(DATA + ROWSIZE*y + x1 * PA_BPP), Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
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break;
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#endif
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}
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}
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}
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