/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2004 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@devolution.com

*/

/*

File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability

23 March 2003

Implements RISC OS display device management.

Routines for full screen and wimp modes are split

into other source files.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "SDL.h"

#include "SDL_syswm.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_riscostask.h"

#include "SDL_riscosvideo.h"

#include "SDL_riscosevents_c.h"

#include "SDL_riscosmouse_c.h"

#include "kernel.h"

#include "swis.h"

#define RISCOSVID_DRIVER_NAME "riscos"

/* Initialization/Query functions */

static int RISCOS_VideoInit(_THIS, SDL_PixelFormat *vformat);

static void RISCOS_VideoQuit(_THIS);

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

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

int RISCOS_GetWmInfo(_THIS, SDL_SysWMinfo *info);

int RISCOS_ToggleFullScreen(_THIS, int fullscreen);

/* Mouse checking */

void RISCOS_CheckMouseMode(_THIS);

extern SDL_GrabMode RISCOS_GrabInput(_THIS, SDL_GrabMode mode);

/* Fullscreen mode functions */

extern SDL_Surface *FULLSCREEN_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

extern void FULLSCREEN_BuildModeList(_THIS);

extern void FULLSCREEN_SetDeviceMode(_THIS);

extern int FULLSCREEN_ToggleFromWimp(_THIS);

/* Wimp mode functions */

extern SDL_Surface *WIMP_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

extern void WIMP_DeleteWindow(_THIS);

extern int WIMP_ToggleFromFullScreen(_THIS);

/* Hardware surface functions - common to WIMP and FULLSCREEN */

static int RISCOS_AllocHWSurface(_THIS, SDL_Surface *surface);

static int RISCOS_LockHWSurface(_THIS, SDL_Surface *surface);

static void RISCOS_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void RISCOS_FreeHWSurface(_THIS, SDL_Surface *surface);

/* RISC OS driver bootstrap functions */

static int RISCOS_Available(void)

{

return(1);

}

static void RISCOS_DeleteDevice(SDL_VideoDevice *device)

{

free(device->hidden);

free(device);

}

static SDL_VideoDevice *RISCOS_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));

/* Set the function pointers */

device->VideoInit = RISCOS_VideoInit;

device->VideoQuit = RISCOS_VideoQuit;

device->ListModes = RISCOS_ListModes;

device->SetVideoMode = RISCOS_SetVideoMode;

device->CreateYUVOverlay = NULL;

device->AllocHWSurface = RISCOS_AllocHWSurface;

device->CheckHWBlit = NULL;

device->FillHWRect = NULL;

device->SetHWColorKey = NULL;

device->SetHWAlpha = NULL;

device->LockHWSurface = RISCOS_LockHWSurface;

device->UnlockHWSurface = RISCOS_UnlockHWSurface;

device->FreeHWSurface = RISCOS_FreeHWSurface;

device->FreeWMCursor = RISCOS_FreeWMCursor;

device->CreateWMCursor = RISCOS_CreateWMCursor;

device->CheckMouseMode = RISCOS_CheckMouseMode;

device->GrabInput = RISCOS_GrabInput;

device->InitOSKeymap = RISCOS_InitOSKeymap;

device->GetWMInfo = RISCOS_GetWmInfo;

device->free = RISCOS_DeleteDevice;

/* Can't get Toggle screen to work if program starts up in Full screen mode so

disable it here and re-enable it when a wimp screen is chosen */

device->ToggleFullScreen = NULL; /*RISCOS_ToggleFullScreen;*/

/* Set other entries for fullscreen mode */

FULLSCREEN_SetDeviceMode(device);

return device;

}

VideoBootStrap RISCOS_bootstrap = {

RISCOSVID_DRIVER_NAME, "RISC OS video driver",

RISCOS_Available, RISCOS_CreateDevice

};

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, &regs, &regs);

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);

}

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

another SDL video routine -- notably UpdateRects.

*/

void RISCOS_VideoQuit(_THIS)

{

RISCOS_ExitTask();

if (this->hidden->alloc_bank) free(this->hidden->alloc_bank);

this->hidden->alloc_bank = 0;

}

SDL_Rect **RISCOS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

if (flags & SDL_FULLSCREEN)

{

/* Build mode list when first required. */

if (SDL_nummodes[0] == 0) FULLSCREEN_BuildModeList(this);

return(SDL_modelist[((format->BitsPerPixel+7)/8)-1]);

} else

return (SDL_Rect **)-1;

}

/* Set up video mode */

SDL_Surface *RISCOS_SetVideoMode(_THIS, SDL_Surface *current,

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

{

if (flags & SDL_FULLSCREEN)

{

RISCOS_StoreWimpMode();

/* Dump wimp window on switch to full screen */

if (this->hidden->window_handle) WIMP_DeleteWindow(this);

return FULLSCREEN_SetVideoMode(this, current, width, height, bpp, flags);

} else

{

RISCOS_RestoreWimpMode();

return WIMP_SetVideoMode(this, current, width, height, bpp, flags);

}

}

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

static int RISCOS_AllocHWSurface(_THIS, SDL_Surface *surface)

{

return(-1);

}

static void RISCOS_FreeHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

/* We need to wait for vertical retrace on page flipped displays */

static int RISCOS_LockHWSurface(_THIS, SDL_Surface *surface)

{

return(0);

}

static void RISCOS_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

int RISCOS_GetWmInfo(_THIS, SDL_SysWMinfo *info)

{

SDL_VERSION(&(info->version));

info->wimpVersion = RISCOS_GetWimpVersion();

info->taskHandle = RISCOS_GetTaskHandle();

info->window = this->hidden->window_handle;

return 1;

}

/* Toggle full screen mode.

Returns 1 if successful otherwise 0

*/

int RISCOS_ToggleFullScreen(_THIS, int fullscreen)

{

if (fullscreen)

{

return FULLSCREEN_ToggleFromWimp(this);

} else

{

return WIMP_ToggleFromFullScreen(this);

}

return 0;

}