/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2012 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);

/* 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);

#define MODE_350(type, xdpi, ydpi) \

(1 | (xdpi << 1) | (ydpi << 13) | (type << 27))

#define MODE_521(type, xeig, yeig, flags) \

(0x78000001 | (xeig << 4) | (yeig << 6) | (flags & 0xFF00) | (type << 20))

/* Table of known pixel formats */

const RISCOS_SDL_PixelFormat *RISCOS_SDL_PixelFormats = (const RISCOS_SDL_PixelFormat[]) {

/* 8bpp palettized */

{ { 255, 0x0080, 3, 28 }, 8, 0, 0, 0 },

/* 12bpp true colour */

{ { 4095, 0x0000, 4, MODE_521(16,1,1,0) }, 12, 0x0f, 0x0f<<4, 0x0f<<8 },

{ { 4095, 0x4000, 4, MODE_521(16,1,1,0x4000) }, 12, 0x0f<<8, 0x0f<<4, 0x0f },

/* 15bpp true colour */

{ { 65535, 0x0000, 4, MODE_350(5,90,90) }, 15, 0x1f, 0x1f<<5, 0x1f<<10 },

{ { 65535, 0x4000, 4, MODE_521(5,1,1,0x4000) }, 15, 0x1f<<10, 0x1f<<5, 0x1f },

/* 16bpp true colour */

{ { 65535, 0x0080, 4, MODE_350(10,90,90) }, 16, 0x1f, 0x3f<<5, 0x1f<<11 },

{ { 65535, 0x4080, 4, MODE_521(10,1,1,0x4000) }, 16, 0x1f<<11, 0x3f<<5, 0x1f },

/* 32bpp true colour */

{ { -1, 0x0000, 5, MODE_350(6,90,90) }, 32, 0xff, 0xff<<8, 0xff<<16 },

{ { -1, 0x4000, 5, MODE_521(6,1,1,0x4000) }, 32, 0xff<<16, 0xff<<8, 0xff },

/* Terminator */

{ },

};

const RISCOS_SDL_PixelFormat *RISCOS_CurrentPixelFormat()

{

_kernel_swi_regs regs;

int vduvars[4];

const RISCOS_SDL_PixelFormat *fmt;

vduvars[0] = 3; /* NColour */

vduvars[1] = 0; /* ModeFlags */

vduvars[2] = 9; /* Log2BPP */

vduvars[3] = -1;

regs.r[0] = (int) vduvars;

regs.r[1] = (int) vduvars;

_kernel_swi(OS_ReadVduVariables, &regs, &regs);

vduvars[1] &= 0xf280; /* Mask out the bits we don't care about */

fmt = RISCOS_SDL_PixelFormats;

while (fmt->sdl_bpp)

{

if ((fmt->ro.ncolour == vduvars[0]) && (fmt->ro.modeflags == vduvars[1]) && (fmt->ro.log2bpp == vduvars[2]))

{

return fmt;

}

fmt++;

}

return NULL;

}

/* 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[3];

const RISCOS_SDL_PixelFormat *fmt;

SDL_PixelFormat *fmt2 = NULL;

if (RISCOS_InitTask() == 0)

{

return 0;

}

vars[0] = 11; /* XWndLimit - num x pixels -1 */

vars[1] = 12; /* YWndLimit - num y pixels -1 */

vars[2] = -1; /* Terminate list */

regs.r[0] = (int)vars;

regs.r[1] = (int)vars;

_kernel_swi(OS_ReadVduVariables, &regs, &regs);

/* Determine the current screen size */

this->info.current_w = vars[0] + 1;

this->info.current_h = vars[1] + 1;

fmt = RISCOS_CurrentPixelFormat();

if (fmt != NULL)

{

fmt2 = SDL_AllocFormat(fmt->sdl_bpp,fmt->rmask,fmt->gmask,fmt->bmask,0);

}

if (fmt2 != NULL)

{

*vformat = *fmt2;

SDL_free(fmt2);

}

else

{

/* Panic! */

vformat->BitsPerPixel = 8;

vformat->Bmask = 0;

vformat->Gmask = 0;

vformat->Rmask = 0;

vformat->BytesPerPixel = 1;

}

/* 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;

}