/*

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"

/*

Nova video card driver

Patrice Mandin

*/

#include <sys/stat.h>

#include <unistd.h>

#include <fcntl.h>

/* Mint includes */

#include <mint/cookie.h>

#include <mint/sysvars.h>

#include <mint/osbind.h>

#include "SDL_video.h"

#include "../ataricommon/SDL_atarimxalloc_c.h"

#include "../ataricommon/SDL_atarisuper.h"

#include "SDL_xbios.h"

#include "SDL_xbios_nova.h"

#define NOVA_FILENAME "\\auto\\sta_vdi.bib"

/*--- ---*/

static nova_xcb_t *NOVA_xcb; /* Pointer to Nova infos */

static nova_resolution_t *NOVA_modes; /* Video modes loaded from a file */

static int NOVA_modecount; /* Number of loaded modes */

static unsigned char NOVA_blnk_time; /* Original blank time */

/*--- Functions ---*/

static void XBIOS_DeleteDevice_NOVA(_THIS);

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 void vsync_NOVA(_THIS);

static void getScreenFormat(_THIS, int bpp, Uint32 *rmask, Uint32 *gmask, Uint32 *bmask, Uint32 *amask);

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);

/* Internal functions */

static void NOVA_SetMode(_THIS, int num_mode);

static void NOVA_SetScreen(_THIS, void *screen);

static void NOVA_SetColor(_THIS, int index, int r, int g, int b);

static nova_resolution_t *NOVA_LoadModes(int *num_modes);

/* Nova driver bootstrap functions */

void SDL_XBIOS_VideoInit_Nova(_THIS, void *cookie_nova)

{

NOVA_xcb = (nova_xcb_t *) cookie_nova;

NOVA_modes = NULL;

NOVA_modecount = 0;

this->free = XBIOS_DeleteDevice_NOVA;

/* Initialize video mode list */

NOVA_modes = NOVA_LoadModes(&NOVA_modecount);

if (!NOVA_modes) {

return;

}

XBIOS_listModes = listModes;

XBIOS_saveMode = saveMode;

XBIOS_setMode = setMode;

XBIOS_restoreMode = restoreMode;

XBIOS_vsync = vsync_NOVA;

XBIOS_getScreenFormat = getScreenFormat;

XBIOS_getLineWidth = getLineWidth;

XBIOS_swapVbuffers = swapVbuffers;

XBIOS_allocVbuffers = allocVbuffers;

XBIOS_freeVbuffers = freeVbuffers;

this->SetColors = setColors;

}

static void XBIOS_DeleteDevice_NOVA(_THIS)

{

if (NOVA_modes) {

SDL_free(NOVA_modes);

}

SDL_free(this->hidden);

SDL_free(this);

}

static void listModes(_THIS, int actually_add)

{

int i;

xbiosmode_t modeinfo;

for (i=0; i<NOVA_modecount; i++) {

int width = NOVA_modes[i].max_x + 1;

int height = NOVA_modes[i].max_y + 1;

int bpp = NOVA_modes[i].planes;

/* Only 8, 16, 24, 32,bpp modes */

if ((NOVA_modes[i].mode <= 1 ) || (NOVA_modes[i].mode == 3 ))

continue;

modeinfo.number = i;

modeinfo.width = width;

modeinfo.height = height;

modeinfo.depth = bpp;

modeinfo.flags = 0;

SDL_XBIOS_AddMode(this, actually_add, &modeinfo);

}

}

static void saveMode(_THIS, SDL_PixelFormat *vformat)

{

int curwidth, curheight, curbpp;

curwidth = NOVA_xcb->max_x + 1;

curheight = NOVA_xcb->max_y + 1;

curbpp = NOVA_xcb->planes;

if (NOVA_xcb->mode == 3 ) {

curbpp = 15;

}

/* Determine the current screen size */

this->info.current_w = curwidth;

this->info.current_h = curheight;

/* Determine the screen depth (use default 8-bit depth) */

vformat->BitsPerPixel = curbpp;

/* Update hardware info */

this->info.hw_available = 1;

this->info.video_mem = NOVA_xcb->mem_size;

XBIOS_oldvmode = NOVA_xcb->resolution;

XBIOS_oldvbase = NOVA_xcb->base;

/* TODO: save palette ? */

NOVA_blnk_time = NOVA_xcb->blnk_time;

NOVA_xcb->blnk_time = 0;

}

static void setMode(_THIS, xbiosmode_t *new_video_mode)

{

NOVA_SetMode(this, new_video_mode->number);

}

static void restoreMode(_THIS)

{

NOVA_SetScreen(this, XBIOS_oldvbase);

NOVA_SetMode(this, XBIOS_oldvmode);

/* TODO: restore palette ? */

NOVA_xcb->blnk_time = NOVA_blnk_time;

}

static void vsync_NOVA(_THIS)

{

NOVA_xcb->p_vsync();

}

static void getScreenFormat(_THIS, int bpp, Uint32 *rmask, Uint32 *gmask, Uint32 *bmask, Uint32 *amask)

{

*rmask = *gmask = *bmask = *amask = 0;

switch(bpp) {

case 15:

*rmask = 31<<2;

*gmask = 3;

*bmask = 31<<8;

*amask = 1<<7;

break;

case 16:

*rmask = 31<<3;

*gmask = 7;

*bmask = 31<<8;

break;

case 24:

*rmask = 255;

*gmask = 255<<8;

*bmask = 255<<16;

break;

case 32:

*rmask = 255<<24;

*gmask = 255<<16;

*bmask = 255<<8;

*amask = 255;

break;

}

}

static int getLineWidth(_THIS, xbiosmode_t *new_video_mode, int width, int bpp)

{

return (NOVA_modes[new_video_mode->number].pitch);

}

static void swapVbuffers(_THIS)

{

NOVA_SetScreen(this, XBIOS_screens[XBIOS_fbnum]);

}

static int allocVbuffers(_THIS, int num_buffers, int bufsize)

{

XBIOS_screens[0] = NOVA_xcb->base;

if (num_buffers>1) {

XBIOS_screens[1] = XBIOS_screens[0] + NOVA_xcb->scrn_sze;

}

return(1);

}

static void freeVbuffers(_THIS)

{

}

static int setColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

int i;

for (i=0; i<ncolors; i++) {

NOVA_SetColor(this, firstcolor+i, colors[i].r, colors[i].g, colors[i].b);

}

return(1);

}

static void NOVA_SetMode(_THIS, int num_mode)

{

if ((num_mode<0) || (num_mode>=NOVA_modecount)) {

return;

}

__asm__ __volatile__ (

"moveql #0,d0\n\t"

"movel %0,a0\n\t"

"movel %1,a1\n\t"

"jsr a1@"

: /* no return value */

: /* input */

"g"(&NOVA_modes[num_mode]), "g"(NOVA_xcb->p_chres)

: /* clobbered registers */

"d0", "d1", "d2", "a0", "a1", "cc", "memory"

);

}

static void NOVA_SetScreen(_THIS, void *screen)

{

__asm__ __volatile__ (

"movel %0,a0\n\t"

"movel %1,a1\n\t"

"jsr a1@"

: /* no return value */

: /* input */

"g"(screen), "g"(NOVA_xcb->p_setscr)

: /* clobbered registers */

"d0", "d1", "d2", "a0", "a1", "cc", "memory"

);

}

static void NOVA_SetColor(_THIS, int index, int r, int g, int b)

{

Uint8 color[3];

color[0] = r;

color[1] = g;

color[2] = b;

__asm__ __volatile__ (

"movel %0,d0\n\t"

"movel %1,a0\n\t"

"movel %2,a1\n\t"

"jsr a1@"

: /* no return value */

: /* input */

"g"(index), "g"(color), "g"(NOVA_xcb->p_setcol)

: /* clobbered registers */

"d0", "d1", "d2", "a0", "a1", "cc", "memory"

);

}

static nova_resolution_t *NOVA_LoadModes(int *num_modes)

{

char filename[32];

unsigned char bootdrive;

void *oldstack;

int handle, length;

nova_resolution_t *buffer;

/* Find boot drive */

oldstack = (void *)Super(NULL);

bootdrive='A'+ *((volatile unsigned short *)_bootdev);

SuperToUser(oldstack);

sprintf(&filename[0], "%c:" NOVA_FILENAME, bootdrive);

/* Load file */

handle = open(filename, O_RDONLY);

if (handle<0) {

SDL_SetError("Unable to open %s\n", filename);

return NULL;

}

length = lseek(handle, 0, SEEK_END);

lseek(handle, 0, SEEK_SET);

buffer = (nova_resolution_t *)SDL_malloc(length);

if (buffer==NULL) {

SDL_SetError("Unable to allocate %d bytes\n", length);

return NULL;

}

read(handle, buffer, length);

close(handle);

if (num_modes!=NULL) {

*num_modes=length/sizeof(nova_resolution_t);

}

return buffer;

}