/*

SDL - Simple DirectMedia Layer

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

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/*

* Xbios SDL video driver

*

* Patrice Mandin

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <unistd.h>

#ifdef HAVE_OPENGL

#include <GL/osmesa.h>

#endif

#include <mint/osbind.h>

#include <mint/falcon.h>

#include "SDL.h"

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_events_c.h"

#include "SDL_ataric2p_s.h"

#include "SDL_atarievents_c.h"

#include "SDL_atarimxalloc_c.h"

#include "SDL_xbios.h"

#define XBIOS_VID_DRIVER_NAME "xbios"

/*#define DEBUG_VIDEO_XBIOS 1*/

/* Initialization/Query functions */

static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **XBIOS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *XBIOS_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int XBIOS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

static void XBIOS_VideoQuit(_THIS);

/* Hardware surface functions */

static int XBIOS_AllocHWSurface(_THIS, SDL_Surface *surface);

static int XBIOS_LockHWSurface(_THIS, SDL_Surface *surface);

static int XBIOS_FlipHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_FreeHWSurface(_THIS, SDL_Surface *surface);

static void XBIOS_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

#ifdef HAVE_OPENGL

/* OpenGL functions */

static int XBIOS_GL_LoadLibrary(_THIS, const char *path);

static void *XBIOS_GL_GetProcAddress(_THIS, const char *proc);

static int XBIOS_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);

static int XBIOS_GL_MakeCurrent(_THIS);

static void XBIOS_GL_SwapBuffers(_THIS);

#endif

/* List of video modes */

/* ST modes */

static int xbiosnummodes_st=1;

static xbiosmode_t xbiosmodelist_st[]={

{ST_LOW>>8,320,200,4,SDL_FALSE}

};

/* TT modes */

static int xbiosnummodes_tt=2;

static xbiosmode_t xbiosmodelist_tt[]={

{TT_LOW,320,480,8,SDL_FALSE},

{TT_LOW,320,240,8,SDL_TRUE} /* Software double-lined mode */

};

/* Falcon RVB modes */

static int xbiosnummodes_f30rvb=16;

static xbiosmode_t xbiosmodelist_f30rvb[]={

{BPS16|COL80|OVERSCAN|VERTFLAG,768,480,16,SDL_FALSE},

{BPS16|COL80|OVERSCAN,768,240,16,SDL_FALSE},

{BPS16|OVERSCAN,384,240,16,SDL_FALSE},

{BPS16|COL80,640,200,16,SDL_FALSE},

{BPS16,320,200,16,SDL_FALSE},

{BPS8|COL80|OVERSCAN|VERTFLAG,768,480,8,SDL_FALSE},

{BPS8|COL80|OVERSCAN,768,240,8,SDL_FALSE},

{BPS8|OVERSCAN,384,240,8,SDL_FALSE},

{BPS8|COL80,640,200,8,SDL_FALSE},

{BPS8,320,200,8,SDL_FALSE}

};

/* Falcon VGA modes */

static int xbiosnummodes_f30vga=6;

static xbiosmode_t xbiosmodelist_f30vga[]={

{BPS16,320,480,16,SDL_FALSE},

{BPS16|VERTFLAG,320,240,16,SDL_FALSE},

{BPS8|COL80,640,480,8,SDL_FALSE},

{BPS8|VERTFLAG,320,240,8,SDL_FALSE}

};

/* To setup palette */

static unsigned short TT_palette[256];

static unsigned long F30_palette[256];

/* Xbios driver bootstrap functions */

static int XBIOS_Available(void)

{

unsigned long cookie_vdo, cookie_mil, cookie_hade;

/* Milan/Hades Atari clones do not have an Atari video chip */

if ( (Getcookie(C__MIL, &cookie_mil) == C_FOUND) ||

(Getcookie(C_hade, &cookie_hade) == C_FOUND) ) {

return 0;

}

/* Cookie _VDO present ? if not, assume ST machine */

if (Getcookie(C__VDO, &cookie_vdo) != C_FOUND) {

cookie_vdo = VDO_ST << 16;

}

/* Test if we have a monochrome monitor plugged in */

switch( cookie_vdo >>16) {

case VDO_ST:

case VDO_STE:

if ( Getrez() == (ST_HIGH>>8) )

return 0;

break;

case VDO_TT:

if ( (EgetShift() & ES_MODE) == TT_HIGH)

return 0;

break;

case VDO_F30:

if ( Montype() == MONITOR_MONO)

return 0;

break;

default:

return 0;

}

return 1;

}

static void XBIOS_DeleteDevice(SDL_VideoDevice *device)

{

free(device->hidden);

free(device);

}

static SDL_VideoDevice *XBIOS_CreateDevice(int devindex)

{

SDL_VideoDevice *device;

/* Initialize all variables that we clean on shutdown */

device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));

if ( device ) {

memset(device, 0, (sizeof *device));

device->hidden = (struct SDL_PrivateVideoData *)

malloc((sizeof *device->hidden));

}

if ( (device == NULL) || (device->hidden == NULL) ) {

SDL_OutOfMemory();

if ( device ) {

free(device);

}

return(0);

}

memset(device->hidden, 0, (sizeof *device->hidden));

/* Video functions */

device->VideoInit = XBIOS_VideoInit;

device->ListModes = XBIOS_ListModes;

device->SetVideoMode = XBIOS_SetVideoMode;

device->SetColors = XBIOS_SetColors;

device->UpdateRects = NULL;

device->VideoQuit = XBIOS_VideoQuit;

device->AllocHWSurface = XBIOS_AllocHWSurface;

device->LockHWSurface = XBIOS_LockHWSurface;

device->UnlockHWSurface = XBIOS_UnlockHWSurface;

device->FlipHWSurface = XBIOS_FlipHWSurface;

device->FreeHWSurface = XBIOS_FreeHWSurface;

#ifdef HAVE_OPENGL

/* OpenGL functions */

device->GL_LoadLibrary = XBIOS_GL_LoadLibrary;

device->GL_GetProcAddress = XBIOS_GL_GetProcAddress;

device->GL_GetAttribute = XBIOS_GL_GetAttribute;

device->GL_MakeCurrent = XBIOS_GL_MakeCurrent;

device->GL_SwapBuffers = XBIOS_GL_SwapBuffers;

#endif

/* Events */

device->InitOSKeymap = Atari_InitOSKeymap;

device->PumpEvents = Atari_PumpEvents;

device->free = XBIOS_DeleteDevice;

return device;

}

VideoBootStrap XBIOS_bootstrap = {

XBIOS_VID_DRIVER_NAME, "Atari Xbios driver",

XBIOS_Available, XBIOS_CreateDevice

};

static int XBIOS_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

int i,j8,j16;

xbiosmode_t *current_mode;

/* Initialize all variables that we clean on shutdown */

memset (SDL_modelist, 0, sizeof(SDL_modelist));

/* Cookie _VDO present ? if not, assume ST machine */

if (Getcookie(C__VDO, &XBIOS_cvdo) != C_FOUND) {

XBIOS_cvdo = VDO_ST << 16;

}

/* Allocate memory for old palette */

XBIOS_oldpalette = (void *)malloc(256*sizeof(long));

if ( !XBIOS_oldpalette ) {

SDL_SetError("Unable to allocate memory for old palette\n");

return(-1);

}

/* Initialize video mode list */

/* and save current screen status (palette, screen address, video mode) */

switch (XBIOS_cvdo >>16) {

case VDO_ST:

case VDO_STE:

{

short *oldpalette;

XBIOS_nummodes=xbiosnummodes_st;

XBIOS_modelist=xbiosmodelist_st;

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;

default:

XBIOS_oldnumcol=0;

break;

}

oldpalette= (short *) XBIOS_oldpalette;

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

*oldpalette++=Setcolor(i,-1);

}

vformat->BitsPerPixel = 8;

}

break;

case VDO_TT:

XBIOS_nummodes=xbiosnummodes_tt;

XBIOS_modelist=xbiosmodelist_tt;

XBIOS_oldvbase=Logbase();

XBIOS_oldvmode=EgetShift();

switch(XBIOS_oldvmode & ES_MODE) {

case TT_LOW:

XBIOS_oldnumcol=256;

break;

case ST_LOW:

case TT_MED:

XBIOS_oldnumcol=16;

break;

case ST_MED:

XBIOS_oldnumcol=4;

break;

case ST_HIGH:

case TT_HIGH:

XBIOS_oldnumcol=2;

break;

default:

XBIOS_oldnumcol=0;

break;

}

if (XBIOS_oldnumcol) {

EgetPalette(0, XBIOS_oldnumcol, XBIOS_oldpalette);

}

vformat->BitsPerPixel = 8;

break;

case VDO_F30:

switch (Montype())

{

case MONITOR_MONO:

/* Not usable */

break;

case MONITOR_RGB:

case MONITOR_TV:

XBIOS_nummodes = xbiosnummodes_f30rvb;

XBIOS_modelist = xbiosmodelist_f30rvb;

break;

case MONITOR_VGA:

XBIOS_nummodes = xbiosnummodes_f30vga;

XBIOS_modelist = xbiosmodelist_f30vga;

break;

}

XBIOS_oldvbase=Logbase();

XBIOS_oldvmode=Vsetmode(-1);

XBIOS_oldnumcol= 1<< (1 << (XBIOS_oldvmode & NUMCOLS));

if (XBIOS_oldnumcol > 256) {

XBIOS_oldnumcol = 0;

}

if (XBIOS_oldnumcol) {

VgetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);

}

vformat->BitsPerPixel = 16;

/* Keep vga/rvb, and pal/ntsc bits */

current_mode = XBIOS_modelist;

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

Uint16 newvmode;

newvmode = current_mode->number;

newvmode &= ~(VGA|PAL);

newvmode |= XBIOS_oldvmode & (VGA|PAL);

current_mode->number = newvmode;

current_mode++;

}

break;

}

current_mode = XBIOS_modelist;

j8 = j16 = 0;

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

switch (current_mode->depth) {

case 4:

case 8:

SDL_modelist[0][j8] = malloc(sizeof(SDL_Rect));

SDL_modelist[0][j8]->x = SDL_modelist[0][j8]->y = 0;

SDL_modelist[0][j8]->w = current_mode->width;

SDL_modelist[0][j8]->h = current_mode->height;

XBIOS_videomodes[0][j8]=current_mode;

current_mode++;

j8++;

break;

case 16:

SDL_modelist[1][j16] = malloc(sizeof(SDL_Rect));

SDL_modelist[1][j16]->x = SDL_modelist[1][j16]->y = 0;

SDL_modelist[1][j16]->w = current_mode->width;

SDL_modelist[1][j16]->h = current_mode->height;

XBIOS_videomodes[1][j16]=current_mode;

current_mode++;

j16++;

break;

}

}

SDL_modelist[0][j8] = NULL;

SDL_modelist[1][j16] = NULL;

XBIOS_screens[0]=NULL;

XBIOS_screens[1]=NULL;

XBIOS_shadowscreen=NULL;

/* Update hardware info */

this->info.hw_available = 1;

this->info.video_mem = (Uint32) Atari_SysMalloc(-1L, MX_STRAM);

/* Init chunky to planar routine */

#ifdef HAVE_OPENGL

this->gl_config.driver_loaded = 1;

#endif

/* We're done! */

return(0);

}

static SDL_Rect **XBIOS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

/* 8 bits -> list 0 */

/* 16 bits -> list 1 */

return NULL;

}

}

static void XBIOS_FreeBuffers(_THIS)

{

int i;

#ifdef HAVE_OPENGL

/* Shutdown OpenGL context */

if (XBIOS_ctx) {

OSMesaDestroyContext(XBIOS_ctx);

XBIOS_ctx = NULL;

}

#endif

for (i=0;i<2;i++) {

if (XBIOS_screensmem[i]!=NULL) {

Mfree(XBIOS_screensmem[i]);

XBIOS_screensmem[i]=NULL;

}

}

if (XBIOS_shadowscreen!=NULL) {

Mfree(XBIOS_shadowscreen);

XBIOS_shadowscreen=NULL;

}

}

static SDL_Surface *XBIOS_SetVideoMode(_THIS, SDL_Surface *current,

int width, int height, int bpp, Uint32 flags)

{

int mode, new_depth;

int i;

xbiosmode_t *new_video_mode;

Uint32 new_screen_size;

Uint32 modeflags;

/* Free current buffers */

XBIOS_FreeBuffers(this);

/* Limit bpp */

if (bpp>16) {

bpp = 16;

}

/* Search if the mode exists (width, height, bpp) */

for ( mode=0; SDL_modelist[bpp][mode]; ++mode ) {

if ( (SDL_modelist[bpp][mode]->w == width) &&

(SDL_modelist[bpp][mode]->h == height) ) {

break;

}

}

if ( SDL_modelist[bpp][mode] == NULL ) {

SDL_SetError("Couldn't find requested mode in list");

return(NULL);

}

/* Allocate needed buffers: simple/double buffer and shadow surface */

new_video_mode = XBIOS_videomodes[bpp][mode];

new_depth = new_video_mode->depth;

if (new_depth == 4) {

new_depth=8;

modeflags |= SDL_SWSURFACE;

} else if (new_depth == 8) {

} else {

modeflags |= SDL_HWSURFACE;

}

new_screen_size = width * height * ((new_depth)>>3);

new_screen_size += 256; /* To align on a 256 byte adress */

if (new_depth == 8) {

XBIOS_shadowscreen = Atari_SysMalloc(new_screen_size, MX_PREFTTRAM);

if (XBIOS_shadowscreen == NULL) {

SDL_SetError("XBIOS_SetVideoMode: Not enough memory for shadow surface");

return (NULL);

}

}

/* Output buffer needs to be twice in size for the software double-line mode */

XBIOS_doubleline = SDL_FALSE;

if (new_video_mode->doubleline) {

new_screen_size <<= 1;

XBIOS_doubleline = SDL_TRUE;

}

XBIOS_screensmem[0] = Atari_SysMalloc(new_screen_size, MX_STRAM);

if (XBIOS_screensmem[0]==NULL) {

XBIOS_FreeBuffers(this);

SDL_SetError("XBIOS_SetVideoMode: Not enough memory for video buffer");

return (NULL);

}

XBIOS_screens[0]=(void *) (( (long) XBIOS_screensmem[0]+256) & 0xFFFFFF00UL);

#ifdef HAVE_OPENGL

if (flags & SDL_OPENGL) {

if (this->gl_config.double_buffer) {

flags |= SDL_DOUBLEBUF;

}

}

#endif

/* Double buffer ? */

if (flags & SDL_DOUBLEBUF) {

XBIOS_screensmem[1] = Atari_SysMalloc(new_screen_size, MX_STRAM);

if (XBIOS_screensmem[1]==NULL) {

XBIOS_FreeBuffers(this);

SDL_SetError("XBIOS_SetVideoMode: Not enough memory for double buffer");

return (NULL);

}

XBIOS_screens[1]=(void *) (( (long) XBIOS_screensmem[1]+256) & 0xFFFFFF00UL);

modeflags |= SDL_DOUBLEBUF;

}

/* Allocate the new pixel format for the screen */

if ( ! SDL_ReallocFormat(current, new_depth, 0, 0, 0, 0) ) {

XBIOS_FreeBuffers(this);

SDL_SetError("Couldn't allocate new pixel format for requested mode");

return(NULL);

}

current->w = XBIOS_width = width;

current->h = XBIOS_height = height;

current->pitch = (width * new_depth)>>3;

/* this is for C2P conversion */

XBIOS_pitch = (new_video_mode->width * new_video_mode->depth)>>3;

if (new_depth == 8)

current->pixels = XBIOS_shadowscreen;

else

current->pixels = XBIOS_screens[0];

XBIOS_fbnum = 0;

#ifdef HAVE_OPENGL

if (flags & SDL_OPENGL) {

GLenum format;

/* Init OpenGL context using OSMesa */

if (new_depth == 8) {

format = OSMESA_COLOR_INDEX;

} else {

format = OSMESA_RGB_565;

}

XBIOS_ctx = OSMesaCreateContextExt( format, this->gl_config.depth_size,

this->gl_config.stencil_size, this->gl_config.accum_red_size +

this->gl_config.accum_green_size + this->gl_config.accum_blue_size +

this->gl_config.accum_alpha_size, NULL );

if (!XBIOS_ctx) {

XBIOS_FreeBuffers(this);

SDL_SetError("OSMesaCreateContext failed");

return(NULL);

}

modeflags |= SDL_OPENGL;

}

#endif

current->flags = modeflags;

switch(XBIOS_cvdo >> 16) {

case VDO_ST:

/* Reset palette */

for (i=0;i<16;i++) {

int c;

c = ((i>>1)<<8) | ((i>>1)<<4) | (i>>1);

if ((i & 1) && (i<15))

c += (1<<4);

if (i==14)

c -= 1<<8;

TT_palette[i]= c;

}

break;

case VDO_STE:

/* Reset palette */

for (i=0;i<16;i++)

{

int c;

c=((i&1)<<3)|((i>>1)&7);

TT_palette[i]=(c<<8)|(c<<4)|c;

}

break;

case VDO_TT:

break;

case VDO_F30:

break;

}

Vsync();

this->UpdateRects = XBIOS_UpdateRects;

return (current);

}

/* We don't actually allow hardware surfaces other than the main one */

static int XBIOS_AllocHWSurface(_THIS, SDL_Surface *surface)

{

return(-1);

}

static void XBIOS_FreeHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

static int XBIOS_LockHWSurface(_THIS, SDL_Surface *surface)

{

return(0);

}

static void XBIOS_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

static void XBIOS_UpdateRects(_THIS, int numrects, SDL_Rect *rects)

{

SDL_Surface *surface;

surface = this->screen;

if ((surface->format->BitsPerPixel) == 8) {

void *destscr;

int destx;

int i;

/* Center on destination screen */

destscr = XBIOS_screens[XBIOS_fbnum];

destscr += XBIOS_pitch * ((XBIOS_height - surface->h) >> 1);

destx = (XBIOS_width - surface->w) >> 1;

destx &= ~15;

destscr += destx;

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

void *source,*destination;

int x1,x2;

x1 = rects[i].x & ~15;

x2 = rects[i].x+rects[i].w;

if (x2 & 15) {

x2 = (x2 | 15) +1;

}

source = surface->pixels;

source += surface->pitch * rects[i].y;

source += x1;

destination = destscr;

destination += XBIOS_pitch * rects[i].y;

destination += x1;

/* Convert chunky to planar screen */

source,

destination,

x2-x1,

rects[i].h,

XBIOS_doubleline,

surface->pitch,

XBIOS_pitch

);

}

}

Vsync();

if ((surface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {

XBIOS_fbnum ^= 1;

if ((surface->format->BitsPerPixel) > 8) {

surface->pixels=XBIOS_screens[XBIOS_fbnum];

}

}

}

static int XBIOS_FlipHWSurface(_THIS, SDL_Surface *surface)

{

if ((surface->format->BitsPerPixel) == 8) {

void *destscr;

int destx;

/* Center on destination screen */

destscr = XBIOS_screens[XBIOS_fbnum];

destscr += XBIOS_pitch * ((XBIOS_height - surface->h) >> 1);

destx = (XBIOS_width - surface->w) >> 1;

destx &= ~15;

destscr += destx;

/* Convert chunky to planar screen */

surface->pixels,

destscr,

surface->w,

surface->h,

XBIOS_doubleline,

surface->pitch,

XBIOS_pitch

);

}

Vsync();

if ((surface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {

XBIOS_fbnum ^= 1;

if ((surface->format->BitsPerPixel) > 8) {

surface->pixels=XBIOS_screens[XBIOS_fbnum];

}

}

return(0);

}

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

{

int i;

int r,v,b;

switch( XBIOS_cvdo >> 16) {

case VDO_ST:

case VDO_STE:

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

{

r = colors[i].r;

v = colors[i].g;

b = colors[i].b;

TT_palette[firstcolor+i]=((r*30)+(v*59)+(b*11))/100;

}

break;

case VDO_TT:

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

{

r = colors[i].r;

v = colors[i].g;

b = colors[i].b;

TT_palette[i]=((r>>4)<<8)|((v>>4)<<4)|(b>>4);

}

break;

case VDO_F30:

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

{

r = colors[i].r;

v = colors[i].g;

b = colors[i].b;

F30_palette[i]=(r<<16)|(v<<8)|b;

}

break;

}

return(1);

}

/* Note: If we are terminated, this could be called in the middle of

another SDL video routine -- notably UpdateRects.

*/

static void XBIOS_VideoQuit(_THIS)

{

int i,j;

Atari_ShutdownEvents();

/* Restore video mode and palette */

switch(XBIOS_cvdo >> 16) {

case VDO_ST:

case VDO_STE:

Setscreen(-1,XBIOS_oldvbase,XBIOS_oldvmode);

if (XBIOS_oldnumcol) {

Setpalette(XBIOS_oldpalette);

}

break;

case VDO_TT:

Setscreen(-1,XBIOS_oldvbase,-1);

EsetShift(XBIOS_oldvmode);

if (XBIOS_oldnumcol) {

EsetPalette(0, XBIOS_oldnumcol, XBIOS_oldpalette);

}

break;

case VDO_F30:

Setscreen(-1, XBIOS_oldvbase, -1);

Vsetmode(XBIOS_oldvmode);

if (XBIOS_oldnumcol) {

VsetRGB(0, XBIOS_oldnumcol, XBIOS_oldpalette);

}

break;

}

Vsync();

if (XBIOS_oldpalette) {

free(XBIOS_oldpalette);

XBIOS_oldpalette=NULL;

}

XBIOS_FreeBuffers(this);

/* Free mode list */

for (j=0;j<NUM_MODELISTS;j++) {

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

if (SDL_modelist[j][i]!=NULL) {

free(SDL_modelist[j][i]);

SDL_modelist[j][i]=NULL;

}

}

}

this->screen->pixels = NULL;

}

#ifdef HAVE_OPENGL

/* OpenGL functions */

static int XBIOS_GL_LoadLibrary(_THIS, const char *path)

{

/* Library is always opened */

this->gl_config.driver_loaded = 1;

return 0;

}

static void *XBIOS_GL_GetProcAddress(_THIS, const char *proc)

{

void *func = NULL;

if (XBIOS_ctx != NULL) {

func = OSMesaGetProcAddress(proc);

}

return func;

}

static int XBIOS_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)

{

GLenum mesa_attrib;

SDL_Surface *surface;

if (XBIOS_ctx == NULL) {

return -1;

}

switch(attrib) {

case SDL_GL_RED_SIZE:

mesa_attrib = GL_RED_BITS;

break;

case SDL_GL_GREEN_SIZE:

mesa_attrib = GL_GREEN_BITS;

break;

case SDL_GL_BLUE_SIZE:

mesa_attrib = GL_BLUE_BITS;

break;

case SDL_GL_ALPHA_SIZE:

mesa_attrib = GL_ALPHA_BITS;

break;

case SDL_GL_DOUBLEBUFFER:

surface = this->screen;

*value = ((surface->flags & SDL_DOUBLEBUF)==SDL_DOUBLEBUF);

return 0;

case SDL_GL_DEPTH_SIZE:

mesa_attrib = GL_DEPTH_BITS;

break;

case SDL_GL_STENCIL_SIZE:

mesa_attrib = GL_STENCIL_BITS;

break;

case SDL_GL_ACCUM_RED_SIZE:

mesa_attrib = GL_ACCUM_RED_BITS;

break;

case SDL_GL_ACCUM_GREEN_SIZE:

mesa_attrib = GL_ACCUM_GREEN_BITS;

break;

case SDL_GL_ACCUM_BLUE_SIZE:

mesa_attrib = GL_ACCUM_BLUE_BITS;

break;

case SDL_GL_ACCUM_ALPHA_SIZE:

mesa_attrib = GL_ACCUM_ALPHA_BITS;

break;

default :

return -1;

}

glGetIntegerv(mesa_attrib, value);

return 0;

}

static int XBIOS_GL_MakeCurrent(_THIS)

{

SDL_Surface *surface;

GLenum type;

if (XBIOS_ctx == NULL) {

return -1;

}

surface = this->screen;

if ((surface->format->BitsPerPixel) == 8) {

type = GL_UNSIGNED_BYTE;

} else {

type = GL_UNSIGNED_SHORT_5_6_5;

}

if (!OSMesaMakeCurrent(XBIOS_ctx, surface->pixels, type, surface->w, surface->h)) {

SDL_SetError("Can not make OpenGL context current");

return -1;

}

return 0;

}

static void XBIOS_GL_SwapBuffers(_THIS)

{

if (XBIOS_ctx == NULL) {