SDL_xbios_st.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 Sam Lantinga
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
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/*
ST/STE Xbios video functions
Patrice Mandin
*/
#include <mint/cookie.h>
#include <mint/osbind.h>
#include "../SDL_sysvideo.h"
#include "../ataricommon/SDL_atarimxalloc_c.h"
#include "../ataricommon/SDL_ataric2p_s.h"
#include "SDL_xbios.h"
static const xbiosmode_t stmodes[]={
{ST_LOW>>8,320,200,4, XBIOSMODE_C2P}
};
static void listModes(_THIS, int actually_add);
static void saveMode(_THIS, SDL_PixelFormat *vformat);
static void setMode_ST(_THIS, xbiosmode_t *new_video_mode);
static void setMode_STE(_THIS, xbiosmode_t *new_video_mode);
static void restoreMode(_THIS);
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static int getLineWidth(_THIS, xbiosmode_t *new_video_mode, int width, int bpp);
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static void swapVbuffers(_THIS);
static int allocVbuffers(_THIS, int num_buffers, int bufsize);
static void freeVbuffers(_THIS);
static int setColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
void SDL_XBIOS_VideoInit_ST(_THIS, unsigned long cookie_cvdo)
{
XBIOS_listModes = listModes;
XBIOS_saveMode = saveMode;
XBIOS_setMode = setMode_ST;
XBIOS_restoreMode = restoreMode;
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XBIOS_getLineWidth = getLineWidth;
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XBIOS_swapVbuffers = swapVbuffers;
XBIOS_allocVbuffers = allocVbuffers;
XBIOS_freeVbuffers = freeVbuffers;
this->SetColors = setColors;
if ((cookie_cvdo>>16) == VDO_STE) {
XBIOS_setMode = setMode_STE;
}
}
static void listModes(_THIS, int actually_add)
{
SDL_XBIOS_AddMode(this, actually_add, &stmodes[0]);
}
static void saveMode(_THIS, SDL_PixelFormat *vformat)
{
short *oldpalette;
int i;
XBIOS_oldvbase=Physbase();
XBIOS_oldvmode=Getrez();
switch(XBIOS_oldvmode << 8) {
case ST_LOW:
XBIOS_oldnumcol=16;
break;
case ST_MED:
XBIOS_oldnumcol=4;
break;
case ST_HIGH:
XBIOS_oldnumcol=2;
break;
}
oldpalette= (short *) XBIOS_oldpalette;
for (i=0;i<XBIOS_oldnumcol;i++) {
*oldpalette++=Setcolor(i,-1);
}
}
static void setMode_ST(_THIS, xbiosmode_t *new_video_mode)
{
int i;
Setscreen(-1,XBIOS_screens[0],-1);
Setscreen(-1,-1,new_video_mode->number);
/* Reset palette, 8 shades of gray with a bit of green interleaved */
for (i=0;i<16;i++) {
TT_palette[i]= ((i>>1)<<8) | (((i*8)/17)<<4) | (i>>1);
}
Setpalette(TT_palette);
}
static void setMode_STE(_THIS, xbiosmode_t *new_video_mode)
{
int i;
Setscreen(-1,XBIOS_screens[0],-1);
Setscreen(-1,-1,new_video_mode->number);
/* Reset palette, 16 shades of gray */
for (i=0;i<16;i++) {
int c;
c=((i&1)<<3)|((i>>1)&7);
TT_palette[i]=(c<<8)|(c<<4)|c;
}
Setpalette(TT_palette);
}
static void restoreMode(_THIS)
{
Setscreen(-1,XBIOS_oldvbase,XBIOS_oldvmode);
if (XBIOS_oldnumcol) {
Setpalette(XBIOS_oldpalette);
}
}
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static int getLineWidth(_THIS, xbiosmode_t *new_video_mode, int width, int bpp)
{
return (width * (((bpp==15) ? 16 : bpp)>>3));
}
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static void swapVbuffers(_THIS)
{
Setscreen(-1,XBIOS_screens[XBIOS_fbnum],-1);
}
static int allocVbuffers(_THIS, int num_buffers, int bufsize)
{
int i;
for (i=0; i<num_buffers; i++) {
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XBIOS_screensmem[i] = Atari_SysMalloc(bufsize+256, MX_STRAM);
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if (XBIOS_screensmem[i]==NULL) {
SDL_SetError("Can not allocate %d KB for buffer %d", bufsize>>10, i);
return (0);
}
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SDL_memset(XBIOS_screensmem[i], 0, bufsize+256);
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XBIOS_screens[i]=(void *) (( (long) XBIOS_screensmem[i]+256) & 0xFFFFFF00UL);
}
return (1);
}
static void freeVbuffers(_THIS)
{
int i;
for (i=0;i<2;i++) {
if (XBIOS_screensmem[i]) {
Mfree(XBIOS_screensmem[i]);
}
XBIOS_screensmem[i]=NULL;
}
}
static int setColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
int i, r,g,b;
for (i=0;i<ncolors;i++) {
r = colors[i].r;
g = colors[i].g;
b = colors[i].b;
TT_palette[firstcolor+i]=((r*30)+(g*59)+(b*11))/100;
}
SDL_Atari_C2pConvert4_pal(TT_palette); /* convert the lighting */
return(1);
}