/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  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;
}

/* vi: set ts=4 sw=4 expandtab: */