/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 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"

/* GGI-based SDL video driver implementation.

*/

#include <fcntl.h>

#include <unistd.h>

#include <sys/mman.h>

#include <ggi/ggi.h>

#include <ggi/gii.h>

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "SDL_ggivideo.h"

#include "SDL_ggimouse_c.h"

#include "SDL_ggievents_c.h"

struct private_hwdata

{

	ggi_visual_t vis;

};

ggi_visual_t VIS;

/* Initialization/Query functions */

static int GGI_VideoInit(_THIS, SDL_PixelFormat *vformat);

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

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

static int GGI_SetColors(_THIS, int firstcolor, int ncolors,

			 SDL_Color *colors);

static void GGI_VideoQuit(_THIS);

/* Hardware surface functions */

static int GGI_AllocHWSurface(_THIS, SDL_Surface *surface);

static int GGI_LockHWSurface(_THIS, SDL_Surface *surface);

static void GGI_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void GGI_FreeHWSurface(_THIS, SDL_Surface *surface);

/* GGI driver bootstrap functions */

static int GGI_Available(void)

{

	ggi_visual_t *vis;

	vis = NULL;

	if (ggiInit() == 0) {

		vis = ggiOpen(NULL);

		if (vis != NULL) {

			ggiClose(vis);

		}

	}

	return (vis != NULL);

}

static void GGI_DeleteDevice(SDL_VideoDevice *device)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_VideoDevice *GGI_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 = GGI_VideoInit;

	device->ListModes = GGI_ListModes;

	device->SetVideoMode = GGI_SetVideoMode;

	device->SetColors = GGI_SetColors;

	device->UpdateRects = NULL;

	device->VideoQuit = GGI_VideoQuit;

	device->AllocHWSurface = GGI_AllocHWSurface;

	device->CheckHWBlit = NULL;

	device->FillHWRect = NULL;

	device->SetHWColorKey = NULL;

	device->SetHWAlpha = NULL;

	device->LockHWSurface = GGI_LockHWSurface;

	device->UnlockHWSurface = GGI_UnlockHWSurface;

	device->FlipHWSurface = NULL;

	device->FreeHWSurface = GGI_FreeHWSurface;

	device->SetCaption = NULL;

	device->SetIcon = NULL;

	device->IconifyWindow = NULL;

	device->GrabInput = NULL;

	device->GetWMInfo = NULL;

	device->InitOSKeymap = GGI_InitOSKeymap;

	device->PumpEvents = GGI_PumpEvents;

	device->free = GGI_DeleteDevice;

	return device;

}

VideoBootStrap GGI_bootstrap = {

	"ggi", "General Graphics Interface (GGI)",

	GGI_Available, GGI_CreateDevice

};

static SDL_Rect video_mode;

static SDL_Rect *SDL_modelist[4] = { NULL, NULL, NULL, NULL };

int GGI_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

	ggi_mode mode =

	{

		1,

		{ GGI_AUTO, GGI_AUTO },

		{ GGI_AUTO, GGI_AUTO },

		{ 0, 0 },

		GT_AUTO,

		{ GGI_AUTO, GGI_AUTO }

	};	

	struct private_hwdata *priv;

	ggi_color pal[256], map[256];

	const ggi_directbuffer *db;

	int err, num_bufs;

	ggi_pixel white, black;

	priv = SDL_malloc(sizeof(struct private_hwdata));

	if (priv == NULL)

	{

		SDL_SetError("Unhandled GGI mode type!\n");

		GGI_VideoQuit(NULL);

	}

	if (ggiInit() != 0)

	{

		SDL_SetError("Unable to initialize GGI!\n");

		GGI_VideoQuit(NULL);

	}

	VIS = ggiOpen(NULL);

	if (VIS == NULL)

	{

		SDL_SetError("Unable to open default GGI visual!\n");

		ggiExit();

		GGI_VideoQuit(NULL);

	}

	ggiSetFlags(VIS, GGIFLAG_ASYNC);

	/* Validate mode, autodetecting any GGI_AUTO or GT_AUTO fields */

	ggiCheckMode(VIS, &mode);

	/* At this point we should have a valid mode - try to set it */

	err = ggiSetMode(VIS, &mode);

	/* If we couldn't set _any_ modes, something is very wrong */

	if (err)

	{

		SDL_SetError("Can't set a mode!\n");

		ggiClose(VIS);

		ggiExit();

		GGI_VideoQuit(NULL);

	}

	/* Determine the current screen size */

	this->info.current_w = mode.virt.x;

	this->info.current_h = mode.virt.y;

	/* Set a palette for palletized modes */

	if (GT_SCHEME(mode.graphtype) == GT_PALETTE)

	{

		ggiSetColorfulPalette(VIS);

		ggiGetPalette(VIS, 0, 1 << vformat->BitsPerPixel, pal);

	}

	/* Now we try to get the DirectBuffer info, which determines whether

	 * SDL can access hardware surfaces directly. */

	num_bufs = ggiDBGetNumBuffers(VIS);

	if (num_bufs > 0)

	{

		db = ggiDBGetBuffer(VIS, 0); /* Only handle one DB for now */

		vformat->BitsPerPixel = db->buffer.plb.pixelformat->depth;

		vformat->Rmask = db->buffer.plb.pixelformat->red_mask;

		vformat->Gmask = db->buffer.plb.pixelformat->green_mask;

		vformat->Bmask = db->buffer.plb.pixelformat->blue_mask;

		/* Fill in our hardware acceleration capabilities */

		this->info.wm_available = 0;

		this->info.hw_available = 1;

		this->info.video_mem = db->buffer.plb.stride * mode.virt.y;

	}

	video_mode.x = 0;

	video_mode.y = 0;

	video_mode.w = mode.virt.x;

	video_mode.h = mode.virt.y;

	SDL_modelist[((vformat->BitsPerPixel + 7) / 8) - 1] = &video_mode;

	/* We're done! */

	return(0);

}

static SDL_Rect **GGI_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

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

}

/* Various screen update functions available */

static void GGI_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

SDL_Surface *GGI_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags)

{

	ggi_mode mode =

	{

		1,

		{ GGI_AUTO, GGI_AUTO },

		{ GGI_AUTO, GGI_AUTO },

		{ 0, 0 },

		GT_AUTO,

		{ GGI_AUTO, GGI_AUTO }

	};

        const ggi_directbuffer *db;

	ggi_color pal[256];

	int err;

	fprintf(stderr, "GGI_SetVideoMode()\n");

	mode.visible.x = mode.virt.x = width;

	mode.visible.y = mode.virt.y = height;

	/* Translate requested SDL bit depth into a GGI mode */	

	switch (bpp)

	{

		case 1:  mode.graphtype = GT_1BIT;  break;

		case 2:  mode.graphtype = GT_2BIT;  break;

		case 4:  mode.graphtype = GT_4BIT;  break;

		case 8:  mode.graphtype = GT_8BIT;  break;

		case 15: mode.graphtype = GT_15BIT; break;

		case 16: mode.graphtype = GT_16BIT; break;

		case 24: mode.graphtype = GT_24BIT; break;

		case 32: mode.graphtype = GT_32BIT; break;

		default:

		SDL_SetError("Unknown SDL bit depth, using GT_AUTO....\n");

		mode.graphtype = GT_AUTO;

	}

	/* Validate mode, autodetecting any GGI_AUTO or GT_AUTO fields */

	ggiCheckMode(VIS, &mode);

	/* At this point we should have a valid mode - try to set it */

	err = ggiSetMode(VIS, &mode);

	/* If we couldn't set _any_ modes, something is very wrong */

	if (err)

	{

		SDL_SetError("Can't set a mode!\n");

		ggiClose(VIS);

		ggiExit();

		GGI_VideoQuit(NULL);

	}

	/* Set a palette for palletized modes */

	if (GT_SCHEME(mode.graphtype) == GT_PALETTE)

	{

		ggiSetColorfulPalette(VIS);

		ggiGetPalette(VIS, 0, 1 << bpp, pal);

	}

	db = ggiDBGetBuffer(VIS, 0);

	/* Set up the new mode framebuffer */

	current->flags = (SDL_FULLSCREEN | SDL_HWSURFACE);

	current->w = mode.virt.x;

	current->h = mode.virt.y;

	current->pitch = db->buffer.plb.stride;

	current->pixels = db->read;

	/* Set the blit function */

	this->UpdateRects = GGI_DirectUpdate;

	/* We're done */

	return(current);

}

static int GGI_AllocHWSurface(_THIS, SDL_Surface *surface)

{

	return(-1);

}

static void GGI_FreeHWSurface(_THIS, SDL_Surface *surface)

{

	return;

}

static int GGI_LockHWSurface(_THIS, SDL_Surface *surface)

{

	return(0);

}

static void GGI_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

	return;

}

static void GGI_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)

{

	int i;

/*	ggiFlush(VIS); */

	for (i = 0; i < numrects; i++)

	{

		ggiFlushRegion(VIS, rects[i].x, rects[i].y, rects[i].w, rects[i].h);

	}

	return;

}

int GGI_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

	int i;

	ggi_color pal[256];

	/* Set up the colormap */

	for (i = 0; i < ncolors; i++)

	{

		pal[i].r = (colors[i].r << 8) | colors[i].r;

		pal[i].g = (colors[i].g << 8) | colors[i].g;

		pal[i].b = (colors[i].b << 8) | colors[i].b;

	}

	ggiSetPalette(VIS, firstcolor, ncolors, pal);

	return 1;

}

void GGI_VideoQuit(_THIS)

{

}

void GGI_FinalQuit(void) 

{

}