/*

    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@libsdl.org

*/

#include "SDL_config.h"

/*

     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 "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_syswm.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/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)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_VideoDevice *RISCOS_CreateDevice(int devindex)

{

	SDL_VideoDevice *device;

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

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

	if ( device ) {

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

		device->hidden = (struct SDL_PrivateVideoData *)

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

	}

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

		SDL_OutOfMemory();

		if ( device ) {

			SDL_free(device);

		}

		return(0);

	}

	SDL_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);

	/* Mouse pointer needs to use the WIMP ShowCursor version so

	   that it doesn't modify the pointer until the SDL Window is

	   entered or the application goes full screen */

	device->ShowWMCursor = WIMP_ShowWMCursor;

	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;

	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, &regs, &regs);

	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);

}

/* 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) SDL_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;

}