int RISCOS_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
_kernel_swi_regs regs;
if (RISCOS_InitTask() == 0)
{
SDL_SetError("Unable to start task");
return 0;
}
regs.r[0] = -1; /* Current mode */
regs.r[1] = 9; /* Log base 2 bpp */
_kernel_swi(OS_ReadModeVariable, ®s, ®s);
vformat->BitsPerPixel = (1 << regs.r[2]);
/* Minimum bpp for SDL is 8 */
if (vformat->BitsPerPixel < 8) vformat->BitsPerPixel = 8;
switch (vformat->BitsPerPixel)
{
case 15:
case 16:
vformat->Bmask = 0x00007c00;
vformat->Gmask = 0x000003e0;
vformat->Rmask = 0x0000001f;
vformat->BitsPerPixel = 16; /* SDL wants actual number of bits used */
vformat->BytesPerPixel = 2;
break;
case 24:
case 32:
vformat->Bmask = 0x00ff0000;
vformat->Gmask = 0x0000ff00;
vformat->Rmask = 0x000000ff;
vformat->BytesPerPixel = 4;
break;
default:
vformat->Bmask = 0;
vformat->Gmask = 0;
vformat->Rmask = 0;
vformat->BytesPerPixel = 1;
break;
}
/* Fill in some window manager capabilities */
this->info.wm_available = 1;
/* We're done! */
return(0);
}
int RISCOS_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
_kernel_swi_regs regs;
int vars[4], vals[3];
if (RISCOS_InitTask() == 0)
{
SDL_SetError("Unable to start task");
return 0;
}
vars[0] = 9; /* Log base 2 bpp */
vars[1] = 11; /* XWndLimit - num x pixels -1 */
vars[2] = 12; /* YWndLimit - num y pixels -1 */
vars[3] = -1; /* Terminate list */
regs.r[0] = (int)vars;
regs.r[1] = (int)vals;
_kernel_swi(OS_ReadVduVariables, ®s, ®s);
vformat->BitsPerPixel = (1 << vals[0]);
/* Determine the current screen size */
this->info.current_w = vals[1] + 1;
this->info.current_h = vals[2] + 1;
/* Minimum bpp for SDL is 8 */
if (vformat->BitsPerPixel < 8) vformat->BitsPerPixel = 8;
switch (vformat->BitsPerPixel)
{
case 15:
case 16:
vformat->Bmask = 0x00007c00;
vformat->Gmask = 0x000003e0;
vformat->Rmask = 0x0000001f;
vformat->BitsPerPixel = 16; /* SDL wants actual number of bits used */
vformat->BytesPerPixel = 2;
break;
case 24:
case 32:
vformat->Bmask = 0x00ff0000;
vformat->Gmask = 0x0000ff00;
vformat->Rmask = 0x000000ff;
vformat->BytesPerPixel = 4;
break;
default:
vformat->Bmask = 0;
vformat->Gmask = 0;
vformat->Rmask = 0;
vformat->BytesPerPixel = 1;
break;
}
/* Fill in some window manager capabilities */
this->info.wm_available = 1;
/* We're done! */
return(0);
}