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SDL_xbios_milan.c
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SDL_xbios_milan.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"
/*
Milan Xbios video functions
Patrice Mandin
*/
#include <mint/cookie.h>
#include <mint/falcon.h>
#include "SDL_xbios.h"
#include "SDL_xbios_milan.h"
#define NUM_PREDEFINED_MODES 7
typedef struct {
Uint16 width, height;
} predefined_mode_t;
static const predefined_mode_t mode_list[NUM_PREDEFINED_MODES]={
{640,400},
{640,480},
{800,608},
{1024,768},
{1152,864},
{1280,1024},
{1600,1200}
};
static const Uint8 mode_bpp[4]={
8, 15, 16, 32
};
/*--- Variables ---*/
static int enum_actually_add;
static SDL_VideoDevice *enum_this;
/*--- Functions ---*/
static void listModes(_THIS, int actually_add);
static void saveMode(_THIS, SDL_PixelFormat *vformat);
static void setMode(_THIS, xbiosmode_t *new_video_mode);
static void restoreMode(_THIS);
static int getLineWidth(_THIS, xbiosmode_t *new_video_mode, int width, int bpp);
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_Milan(_THIS)
{
XBIOS_listModes = listModes;
XBIOS_saveMode = saveMode;
XBIOS_setMode = setMode;
XBIOS_restoreMode = restoreMode;
XBIOS_getLineWidth = getLineWidth;
XBIOS_swapVbuffers = swapVbuffers;
XBIOS_allocVbuffers = allocVbuffers;
XBIOS_freeVbuffers = freeVbuffers;
this->SetColors = setColors;
}
static unsigned long /*cdecl*/ enumfunc(SCREENINFO *inf, unsigned long flag)
{
xbiosmode_t modeinfo;
modeinfo.number = inf->devID;
modeinfo.width = inf->scrWidth;
modeinfo.height = inf->scrHeight;
modeinfo.depth = inf->scrPlanes;
modeinfo.flags = 0;
SDL_XBIOS_AddMode(enum_this, enum_actually_add, &modeinfo);
return ENUMMODE_CONT;
}
static void listModes(_THIS, int actually_add)
{
int i;
/* Read validated predefined modes */
for (i=0; i<NUM_PREDEFINED_MODES; i++) {
int j;
Uint16 deviceid = 0x1000 + (i<<4);
for (j=1; j<4; j++) {
if (Validmode(deviceid + j)) {
xbiosmode_t modeinfo;
modeinfo.number = deviceid + j;
modeinfo.width = mode_list[i].width;
modeinfo.height = mode_list[i].height;
modeinfo.depth = mode_bpp[j-1];
modeinfo.flags = 0;
SDL_XBIOS_AddMode(this, actually_add, &modeinfo);
}
}
}
/* Read custom created modes */
enum_this = this;
enum_actually_add = actually_add;
VsetScreen(-1, &enumfunc, MI_MAGIC, CMD_ENUMMODES);
}
static void saveMode(_THIS, SDL_PixelFormat *vformat)
{
SCREENINFO si;
/* Read infos about current mode */
VsetScreen(-1, &XBIOS_oldvmode, MI_MAGIC, CMD_GETMODE);
si.size = sizeof(SCREENINFO);
si.devID = XBIOS_oldvmode;
si.scrFlags = 0;
VsetScreen(-1, &si, MI_MAGIC, CMD_GETINFO);
this->info.current_w = si.scrWidth;
this->info.current_h = si.scrHeight;
XBIOS_oldnumcol = 0;
if (si.scrFlags & SCRINFO_OK) {
if (si.scrPlanes <= 8) {
XBIOS_oldnumcol = 1<<si.scrPlanes;
}
}
if (XBIOS_oldnumcol) {
VgetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);
}
}
static void setMode(_THIS, xbiosmode_t *new_video_mode)
{
VsetScreen(-1, XBIOS_screens[0], MI_MAGIC, CMD_SETADR);
VsetScreen(-1, new_video_mode->number, MI_MAGIC, CMD_SETMODE);
/* Set hardware palette to black in True Colour */
if (new_video_mode->depth > 8) {
SDL_memset(F30_palette, 0, sizeof(F30_palette));
VsetRGB(0,256,F30_palette);
}
}
static void restoreMode(_THIS)
{
VsetScreen(-1, &XBIOS_oldvbase, MI_MAGIC, CMD_SETADR);
VsetScreen(-1, &XBIOS_oldvmode, MI_MAGIC, CMD_SETMODE);
if (XBIOS_oldnumcol) {
VsetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);
}
}
static void swapVbuffers(_THIS)
{
VsetScreen(-1, XBIOS_screens[XBIOS_fbnum], MI_MAGIC, CMD_SETADR);
}
static int getLineWidth(_THIS, xbiosmode_t *new_video_mode, int width, int bpp)
{
SCREENINFO si;
int retvalue = width * (((bpp==15) ? 16 : bpp)>>3);
/* Set pitch of new mode */
si.size = sizeof(SCREENINFO);
si.devID = new_video_mode->number;
si.scrFlags = 0;
VsetScreen(-1, &si, VN_MAGIC, CMD_GETINFO);
if (si.scrFlags & SCRINFO_OK) {
retvalue = si.lineWrap;
}
return (retvalue);
}
static int allocVbuffers(_THIS, int num_buffers, int bufsize)
{
int i;
for (i=0; i<num_buffers; i++) {
if (i==0) {
/* Buffer 0 is current screen */
XBIOS_screensmem[i] = XBIOS_oldvbase;
} else {
VsetScreen(-1, &XBIOS_screensmem[i], MI_MAGIC, CMD_ALLOCPAGE);
}
if (!XBIOS_screensmem[i]) {
SDL_SetError("Can not allocate %d KB for buffer %d", bufsize>>10, i);
return (0);
}
SDL_memset(XBIOS_screensmem[i], 0, bufsize);
XBIOS_screens[i]=XBIOS_screensmem[i];
}
return (1);
}
static void freeVbuffers(_THIS)
{
int i;
for (i=0;i<2;i++) {
if (XBIOS_screensmem[i]) {
if (i==1) {
VsetScreen(-1, -1, MI_MAGIC, CMD_FREEPAGE);
} else {
/* Do not touch buffer 0 */
}
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;
F30_palette[i]=(r<<16)|(g<<8)|b;
}
VsetRGB(firstcolor,ncolors,F30_palette);
return (1);
}