#ifdef USE_SDL

#include <stdio.h>
#include <SDL.h>
#include <SDL_video.h>
#include <SDL_events.h>
#include "h2def.h"
#include "soundst.h"
#include "sdlvideo.h"

int SDLWidth;
int SDLHeight;
int SDLMaxWidth;
int SDLMaxHeight;
int SDLBPP;
int SDLVFlags=SDL_HWSURFACE | SDL_FULLSCREEN;
int WMAvailable;

Uint32 Rmask, Gmask, Bmask, Amask;
Uint8 Rshift, Gshift, Bshift, Ashift;
Uint8 Rloss, Gloss, Bloss, Aloss;
Uint32 colorkey;
Uint8 alpha;


SDL_Surface *Surface;
int unknown_surface;

static event_t	event;
SDL_Overlay *Overlay;
SDL_Rect OvRect;

int mouse_scale_factor;
int save_buttons;
int grab_input;

extern int usemouse;

void (*SetSDLColors)(byte *);
void (*PaintOnSDLSurface)(void);

/* RGB palette for RGB rendering with direct color coding */

Uint32 Palette[256]; 

/* YUV palettes for YUV rendering */

int Ypal[256];
int Upal[256];
int Vpal[256];
int YUVPaletteChanged;


void SetSDLColorsDirect(byte *palette) {
  Uint32 red,green,blue;
  int	i,j;
  for (i=0,j=0 ; i<768 ; i+=3,j++)
    {
      red = gammatable[usegamma][palette[i]];
      green = gammatable[usegamma][palette[i+1]];
      blue = gammatable[usegamma][palette[i+2]];
      red>>=Rloss;
      green>>=Gloss;
      blue>>=Bloss;
      Palette[j]=((red<<Rshift)&Rmask)|((green<<Gshift)&Gmask)|((blue<<Bshift)&Bmask);
    }
}

void SetSDLColorsFor8bit(byte *palette) {
  SDL_Color c[256];
  Uint32 red,green,blue; 
  int	i,j;
  for (i=0,j=0 ; i<768 ; i+=3,j++)
    {
      red = gammatable[usegamma][palette[i]];
      green = gammatable[usegamma][palette[i+1]];
      blue = gammatable[usegamma][palette[i+2]]; 
      c[j].r=red;
      c[j].g=green;
      c[j].b=blue;
    }
  SDL_SetColors(Surface, c, 0, 256);
}

void SetSDLColorsYUV(byte *palette) {
  Uint32 red,green,blue; 
  int	i,j;
  for (i=0,j=0 ; i<768 ; i+=3,j++)
    {
      red = gammatable[usegamma][palette[i]];
      green = gammatable[usegamma][palette[i+1]];
      blue = gammatable[usegamma][palette[i+2]]; 
      Ypal[j]=0.257*red+0.504*green+0.098*blue+16;
      Upal[j]=-0.148*red-0.291*green+0.439*blue+128;
      Vpal[j]=0.439*red-0.368*green-0.071*blue+128;
    }
  YUVPaletteChanged=1;
}

void PaintOnSDLSurface1(void) {
 int i,j,dx,dy;
 Uint8 *s,*os;
 Uint8 *d;

 SDL_LockSurface(Surface);
 s=screen;
 d=(Uint8 *)Surface->pixels;
 dy=0;
 for (i=0;i<SDLHeight;i++) {
  dx=0;
  os=s;
  for (j=0;j<SDLWidth;j++) {
   *d++=*s;
   if ((dx+=WIDTH)>=SDLWidth) { dx-=SDLWidth; s++; }
  }
  s=os;
  if ((dy+=HEIGHT)>=SDLHeight) { dy-=SDLHeight; s+=WIDTH; }
 }
 SDL_UnlockSurface(Surface);
 SDL_UpdateRect(Surface,0,0,0,0);
}


void PaintOnSDLSurface2(void) {
 int i,j,dx,dy;
 Uint8 *s,*os;
 Uint16 *d;

 SDL_LockSurface(Surface);
 s=screen;
 d=(Uint16 *)Surface->pixels;
 dy=0;
 for (i=0;i<SDLHeight;i++) {
  dx=0;
  os=s;
  for (j=0;j<SDLWidth;j++) {
   *d++=(Uint16)Palette[*s];
   if ((dx+=WIDTH)>=SDLWidth) { dx-=SDLWidth; s++; }
  }
  s=os;
  if ((dy+=HEIGHT)>=SDLHeight) { dy-=SDLHeight; s+=WIDTH; }
 }
 SDL_UnlockSurface(Surface);
 SDL_UpdateRect(Surface,0,0,0,0);
}

void PaintOnSDLSurface3(void) {
 int i,j,dx,dy;
 Uint8 *s,*os;
 Uint8 *d;
 union palent {
  Uint32 i;
  Uint8 b[4];
 } pe;

 SDL_LockSurface(Surface);
 s=screen;
 d=(Uint8 *)Surface->pixels;
 dy=0;
 for (i=0;i<SDLHeight;i++) {
  dx=0;
  os=s;
  for (j=0;j<SDLWidth;j++) {
   pe.i=Palette[*s];
   *d++=pe.b[0];
   *d++=pe.b[1];
   *d++=pe.b[2];
   if ((dx+=WIDTH)>=SDLWidth) { dx-=SDLWidth; s++; }
  }
  s=os;
  if ((dy+=HEIGHT)>=SDLHeight) { dy-=SDLHeight; s+=WIDTH; }
 }
 SDL_UnlockSurface(Surface);
 SDL_UpdateRect(Surface,0,0,0,0);
}

void PaintOnSDLSurface4(void) {
 int i,j,dx,dy;
 Uint8 *s,*os;
 Uint32 *d;

 SDL_LockSurface(Surface);
 s=screen;
 d=(Uint32 *)Surface->pixels;
 dy=0;
 for (i=0;i<SDLHeight;i++) {
  dx=0;
  os=s;
  for (j=0;j<SDLWidth;j++) {
   *d++=Palette[*s];
   if ((dx+=WIDTH)>=SDLWidth) { dx-=SDLWidth; s++; }
  }
  s=os;
  if ((dy+=HEIGHT)>=SDLHeight) { dy-=SDLHeight; s+=WIDTH; }
 }
 SDL_UnlockSurface(Surface);
 SDL_UpdateRect(Surface,0,0,0,0);
}



void AdjustYUVPalette(void) {
/* int maxbits;
 int i,j;
 int minU,minV;
 
 maxbits=0;
 minU=0; minV=0;
 
 for (i=0;i<256;i++)  {
  if (Upal[i]<minU) minU=Upal[i];
  if (Vpal[i]<minU) minU=Vpal[i];
 }


 for (i=0;i<256;i++)  {
  Upal[i]-=minU;
  Vpal[i]-=minU;
 }
 
 for(i=0;i<256;i++) {
  for(j=31;j>0;j--)
   if (Ypal[i]&(1<<j)) break; 
  if (j>maxbits) maxbits=j;
 }
    
 for(i=0;i<256;i++) {
  for(j=31;j>0;j--)
   if (Upal[i]&(1<<j)) break; 
  if (j>maxbits) maxbits=j;
 }
 
 for(i=0;i<256;i++) {
  for(j=31;j>0;j--)
   if (Vpal[i]&(1<<j)) break; 
  if (j>maxbits) maxbits=j;
 }
 printf("maxbits=%d\n",maxbits);*/
 YUVPaletteChanged=0;
}


void PaintYUVPlanes(Uint8 *Y, Uint8 *U, Uint8 *V) {
 int i,j,k,l;
 Uint8 *s;
 s=(Uint8 *)screen;
 k=0; l=0;
 for (i=0; i<HEIGHT; i++) {
  for (j=0; j<WIDTH; j++) {
   Y[k]=Y[k+1]=Y[k+WIDTH*2]=Y[k+WIDTH*2+1]=Ypal[*s];
   U[l]=Upal[*s];
   V[l]=Vpal[*s];
   l++; k+=2;
   s++;
  }
  k+=WIDTH*2;
 }
}

void PaintOnSDLSurfaceIYUV(void) {
 if (YUVPaletteChanged) AdjustYUVPalette();
 SDL_LockYUVOverlay(Overlay);
 PaintYUVPlanes(Overlay->pixels[0],Overlay->pixels[1],Overlay->pixels[2]);
 SDL_UnlockYUVOverlay(Overlay);
 SDL_DisplayYUVOverlay(Overlay,&OvRect);
}

void PaintOnSDLSurfaceYV12(void) {
 if (YUVPaletteChanged) AdjustYUVPalette();
 SDL_LockYUVOverlay(Overlay);
 PaintYUVPlanes(Overlay->pixels[0],Overlay->pixels[2],Overlay->pixels[1]);
 SDL_UnlockYUVOverlay(Overlay);
 SDL_DisplayYUVOverlay(Overlay,&OvRect);
}


int I_TrySDLOverlay(Uint32 format) {
 Overlay=SDL_CreateYUVOverlay(WIDTH*2,HEIGHT*2,format,Surface);
 if (!Overlay->hw_overlay) {
  SDL_FreeYUVOverlay(Overlay);
  Overlay=NULL;
  return 0;
 }
 return 1;
}

void I_InitSDLOverlay(void) {
 if (I_TrySDLOverlay(SDL_IYUV_OVERLAY)) {
  PaintOnSDLSurface=PaintOnSDLSurfaceIYUV;
  printf("Using IYUV accelerated blits.\n");
  return;
 }
 if (I_TrySDLOverlay(SDL_YV12_OVERLAY)) {
  PaintOnSDLSurface=PaintOnSDLSurfaceYV12;
  printf("Using YV12 accelerated blits.\n");
  return;
 }
 printf("No YUV acceleration supported.\n");
}

int VSDL_InitGraphics(void) {
 char drvname[256];
 SDL_Rect **modes;
 int i;
 int wid, hei;
 SDL_VideoInfo *vinfo;
  
 unknown_surface=0;
 
 if (M_CheckParm("-windowed")) 
  SDLVFlags&=~SDL_FULLSCREEN;

 vinfo=SDL_GetVideoInfo(); 
 if (!vinfo) 
 {
  printf("SDL: Cannot obtain video info!\n");
  return 0;
 }
 SDLBPP=vinfo->vfmt->BitsPerPixel;
 WMAvailable=(int)vinfo->wm_available;
 
 switch (vinfo->vfmt->BytesPerPixel) {
  case 2:
   SetSDLColors=SetSDLColorsDirect;
   PaintOnSDLSurface=PaintOnSDLSurface2;
  break;
  case 4:
   SetSDLColors=SetSDLColorsDirect;
   PaintOnSDLSurface=PaintOnSDLSurface4;
  break;
  case 3:
   SetSDLColors=SetSDLColorsDirect;
   PaintOnSDLSurface=PaintOnSDLSurface3;
  break;
  case 1:
   SDLVFlags|=SDL_HWPALETTE;
   SetSDLColors=SetSDLColorsFor8bit;
   PaintOnSDLSurface=PaintOnSDLSurface1;
   break;
  default:
   unknown_surface=1;
   SDLBPP=8;
   SetSDLColors=SetSDLColorsFor8bit;
   PaintOnSDLSurface=PaintOnSDLSurface1;
   printf("SDL video: This surface is unknown to me, trying 8 bpp.\n");
 }
 
 Rmask=vinfo->vfmt->Rmask;
 Gmask=vinfo->vfmt->Gmask;
 Bmask=vinfo->vfmt->Bmask;
 Amask=vinfo->vfmt->Amask;

 Rshift=vinfo->vfmt->Rshift;
 Gshift=vinfo->vfmt->Gshift;
 Bshift=vinfo->vfmt->Bshift;
 Ashift=vinfo->vfmt->Ashift;

 Rloss=vinfo->vfmt->Rloss;
 Gloss=vinfo->vfmt->Gloss;
 Bloss=vinfo->vfmt->Bloss;
 Aloss=vinfo->vfmt->Aloss;

 colorkey=vinfo->vfmt->colorkey;
 alpha=vinfo->vfmt->alpha;

 if (!SDL_VideoDriverName(drvname,256)) {
  printf("SDL: No video driver attached\n");
  return 0;
 }

 printf("SDL: Using video driver:%s\n",drvname);
 modes=SDL_ListModes(NULL,SDLVFlags);
 
 if (modes==(SDL_Rect **)0) {
  printf("SDL: No video modes available!\n");
  return 0;
 }

 /* Find the best resolution to render 320x200 picture. 
  Use 320x240 for realistic picture in windowed modes */

 if (modes==(SDL_Rect **)-1) {
  printf("SDL: All modes available\n");
  SDLWidth=SDLMaxWidth=320;
  SDLHeight=SDLMaxHeight=240;

  if (M_CheckParm("-2")) {
   SDLWidth*=2; SDLMaxWidth*=2;
   SDLHeight*=2; SDLMaxHeight*=2;
  }

  if (M_CheckParm("-3")) {
   SDLWidth*=3; SDLMaxWidth*=3;
   SDLHeight*=3; SDLMaxHeight*=3;
  }

  if (M_CheckParm("-4")) {
   SDLWidth*=4; SDLMaxWidth*=4;
   SDLHeight*=4; SDLMaxHeight*=4;
  }
   
 }
 else 
 {
  SDLMaxWidth=SDLMaxHeight=wid=hei=0;
  for (i=0; modes[i];i++) {
   if (!wid) wid=modes[i]->w;
   if (!hei) hei=modes[i]->h;
   if ((wid>modes[i]->w && modes[i]->w>=320) || 
       (hei>modes[i]->h && modes[i]->h>=240)) {
     wid=modes[i]->w;
     hei=modes[i]->h;
   }
   if ((SDLMaxWidth<modes[i]->w) || (SDLMaxHeight<modes[i]->h)) {
    SDLMaxHeight=modes[i]->h;
    SDLMaxWidth=modes[i]->w;
   }
  } 
  SDLWidth=wid;
  SDLHeight=hei;
  if (!SDLWidth || !SDLHeight) {
   printf("SDL: Can't set video mode");
   return 0;
  }
 }
 printf("Found best mode: %dx%dx%d\n",SDLWidth,SDLHeight,SDLBPP);
 Surface=SDL_SetVideoMode(SDLWidth, SDLHeight, SDLBPP, SDLVFlags);

 if (!Surface) {
  /* We cannot set video mode with desired parameters. Try to rely on SDL's 
  knowledge about it */
  unknown_surface=1;
  SDLBPP=8;
  SDLVFlags|=SDL_HWPALETTE;
  Surface=SDL_SetVideoMode(SDLWidth, SDLHeight, SDLBPP, SDLVFlags);
  if (Surface) goto success;
  SDLVFlags&=~SDL_HWPALETTE;
  Surface=SDL_SetVideoMode(SDLWidth, SDLHeight, SDLBPP, SDLVFlags);
  if (Surface) goto success;  
  SDLVFlags&=~SDL_HWSURFACE;
  Surface=SDL_SetVideoMode(SDLWidth, SDLHeight, SDLBPP, SDLVFlags);
  if (Surface) goto success;  
  /* Give up */
  printf("SDL: Can't set video mode!\n");
  return 0;
 }
 
 if ((SDLMaxWidth>=WIDTH*2 || SDLMaxHeight>=HEIGHT*2) && !unknown_surface) {
  I_InitSDLOverlay();
  if (Overlay) {
   SetSDLColors=SetSDLColorsYUV;
   SDLWidth=SDLMaxWidth;
   SDLHeight=SDLMaxHeight;
   OvRect.x=OvRect.y=0;
   OvRect.w=SDLWidth;
   OvRect.h=SDLHeight;
   Surface=SDL_SetVideoMode(SDLWidth, SDLHeight, SDLBPP, SDLVFlags);
  }
 }
 
success:
 if (WMAvailable) {
  SDL_WM_SetCaption("U-Hexen 0.6",NULL);
  if(M_CheckParm("-nograb")) {
    grab_input = 0;
  }
  else {
   grab_input = 1;
   SDL_WM_GrabInput(SDL_GRAB_ON);
  }
 }
 SDL_WarpMouse(SDLWidth/2,SDLHeight/2);
 SDL_ShowCursor(SDL_DISABLE);
 return 1;
}

void VSDL_ShutdownGraphics(void)
{
 if (WMAvailable) {
  if(grab_input == 1) SDL_WM_GrabInput(SDL_GRAB_OFF);
 } 
}

void VSDL_GetEvent(void)
{
 SDL_Event Event;
 while (SDL_PollEvent(&Event)) {

 switch(Event.type) {
  case SDL_KEYUP:
  case SDL_KEYDOWN:
  switch(Event.key.keysym.sym) {
   case SDLK_UP:
   case SDLK_KP8:
   event.data1=KEY_UPARROW; break;

   case SDLK_DOWN:
   case SDLK_KP2:
   event.data1=KEY_DOWNARROW; break;
 
   case SDLK_RIGHT:
   case SDLK_KP6:
   event.data1=KEY_RIGHTARROW; break;

   case SDLK_LEFT:
   case SDLK_KP4:
   event.data1=KEY_LEFTARROW; break;

   case SDLK_HOME:
   case SDLK_KP7:
   event.data1=KEY_HOME; break;
   
   case SDLK_PAGEUP:
   case SDLK_KP9:
   event.data1=KEY_PGUP; break;

   case SDLK_PAGEDOWN:
   case SDLK_KP3:
   event.data1=KEY_PGDN; break;

   case SDLK_END:
   case SDLK_KP1:
   event.data1=KEY_END; break;

   case SDLK_RSHIFT:
   case SDLK_LSHIFT:
   event.data1=KEY_RSHIFT; break;

   case SDLK_RCTRL:
   case SDLK_LCTRL:
   event.data1=KEY_RCTRL; break;

   case SDLK_RALT:
   case SDLK_LALT:
   event.data1=KEY_RALT; break;

   case SDLK_F1:
   event.data1=KEY_F1; break;
   case SDLK_F2:
   event.data1=KEY_F2; break;
   case SDLK_F3:
   event.data1=KEY_F3; break;
   case SDLK_F4:
   event.data1=KEY_F4; break;
   case SDLK_F5:
   event.data1=KEY_F5; break;
   case SDLK_F6:
   event.data1=KEY_F6; break;
   case SDLK_F7:
   event.data1=KEY_F7; break;
   case SDLK_F8:
   event.data1=KEY_F8; break;
   case SDLK_F9:
   event.data1=KEY_F9; break;
   case SDLK_F10:
   event.data1=KEY_F10; break;
   case SDLK_F11:
   event.data1=KEY_F11; break;
   case SDLK_F12:
   event.data1=KEY_F12; break;

   default:
      event.data1=Event.key.keysym.sym;
   
  }
  event.type=Event.type==SDL_KEYDOWN ? ev_keydown : ev_keyup;
  H2_PostEvent(&event);
 break;
 case SDL_MOUSEBUTTONUP:
  if (!usemouse) break;
  event.data1=0;
  switch(Event.button.button) {
   case SDL_BUTTON_LEFT:
    event.data1&=1; break;
   case SDL_BUTTON_RIGHT:
    event.data1&=~4; break;
   case SDL_BUTTON_MIDDLE:
    event.data1&=~2; break;
  }
  save_buttons=event.data1;
  event.data2=0;
  event.data3=0;
  event.type=ev_mouse;
  H2_PostEvent(&event);
 break;
 case SDL_MOUSEBUTTONDOWN:
  if (!usemouse) break;
  event.data1=0;
  switch(Event.button.button) {
   case SDL_BUTTON_LEFT:
    event.data1|=1; break;
   case SDL_BUTTON_RIGHT:
    event.data1|=4; break;
   case SDL_BUTTON_MIDDLE:
    event.data1|=2; break;
  }
  save_buttons=event.data1;
  event.data2=0;
  event.data3=0;
  event.type=ev_mouse;
  H2_PostEvent(&event);
 break;
 case SDL_MOUSEMOTION:
  if (!usemouse) break;
  event.data1=save_buttons;
  if (Event.motion.x==SDLWidth/2 && Event.motion.y==SDLHeight/2) break;
  if ((event.data2=(Event.motion.xrel)*mouse_scale_factor) ||
      (event.data3=(-Event.motion.yrel)*mouse_scale_factor)) {
    if(grab_input == 1) SDL_WarpMouse(SDLWidth/2,SDLHeight/2);
    event.type=ev_mouse;
    H2_PostEvent(&event);
  }
  break;
  } 
 }
}


void VSDL_FinishUpdate(void)
{
    PaintOnSDLSurface();
    SDL_Delay(10); /* give time to another threads */
}

void VSDL_SetPalette(byte *palette)
{
    SetSDLColors(palette);
}

#endif
void VSDL_Stub(void)
{

}