/*

    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"

#include "SDL_video.h"

#include "../SDL_blit.h"

#include "SDL_fbmatrox.h"

#include "matrox_mmio.h"

/* Wait for vertical retrace - taken from the XFree86 Matrox driver */

static void WaitVBL(_THIS)

{

	int count;

	/* find start of retrace */

	mga_waitidle();

	while (  (mga_in8(0x1FDA) & 0x08) )

		;

	while ( !(mga_in8(0x1FDA) & 0x08) )

		; 

	/* wait until we're past the start */

	count = mga_in32(0x1E20) + 2;

	while ( mga_in32(0x1E20) < count )

		;

}

static void WaitIdle(_THIS)

{

	mga_waitidle();

}

/* Sets video mem colorkey and accelerated blit function */

static int SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key)

{

	return(0);

}

/* Sets per surface hardware alpha value */

#if 0

static int SetHWAlpha(_THIS, SDL_Surface *surface, Uint8 value)

{

	return(0);

}

#endif

static int FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color)

{

	int dstX, dstY;

	Uint32 fxbndry;

	Uint32 ydstlen;

	Uint32 fillop;

	/* Don't blit to the display surface when switched away */

	if ( switched_away ) {

		return -2; /* no hardware access */

	}

	if ( dst == this->screen ) {

		SDL_mutexP(hw_lock);

	}

	switch (dst->format->BytesPerPixel) {

	    case 1:

		color |= (color<<8);

	    case 2:

		color |= (color<<16);

		break;

	}

	/* Set up the X/Y base coordinates */

	FB_dst_to_xy(this, dst, &dstX, &dstY);

	/* Adjust for the current rectangle */

	dstX += rect->x;

	dstY += rect->y;

	/* Set up the X boundaries */

	fxbndry = (dstX | ((dstX+rect->w) << 16));

	/* Set up the Y boundaries */

	ydstlen = (rect->h | (dstY << 16));

	/* Set up for color fill operation */

	fillop = MGADWG_TRAP | MGADWG_SOLID |

	         MGADWG_ARZERO | MGADWG_SGNZERO | MGADWG_SHIFTZERO;

	/* Execute the operations! */

	mga_wait(5);

	mga_out32(MGAREG_DWGCTL, fillop | MGADWG_REPLACE);

	mga_out32(MGAREG_FCOL, color);

	mga_out32(MGAREG_FXBNDRY, fxbndry);

	mga_out32(MGAREG_YDSTLEN + MGAREG_EXEC, ydstlen);

	FB_AddBusySurface(dst);

	if ( dst == this->screen ) {

		SDL_mutexV(hw_lock);

	}

	return(0);

}

static int HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,

                       SDL_Surface *dst, SDL_Rect *dstrect)

{

	SDL_VideoDevice *this = current_video;

	int pitch, w, h;

	int srcX, srcY;

	int dstX, dstY;

	Uint32 sign;

	Uint32 start, stop;

	int skip;

	Uint32 blitop;

	/* FIXME: For now, only blit to display surface */

	if ( dst->pitch != SDL_VideoSurface->pitch ) {

		return(src->map->sw_blit(src, srcrect, dst, dstrect));

	}

	/* Don't blit to the display surface when switched away */

	if ( switched_away ) {

		return -2; /* no hardware access */

	}

	if ( dst == this->screen ) {

		SDL_mutexP(hw_lock);

	}

	/* Calculate source and destination base coordinates (in pixels) */

	w = dstrect->w;

	h = dstrect->h;

	FB_dst_to_xy(this, src, &srcX, &srcY);

	FB_dst_to_xy(this, dst, &dstX, &dstY);

	/* Adjust for the current blit rectangles */

	srcX += srcrect->x;

	srcY += srcrect->y;

	dstX += dstrect->x;

	dstY += dstrect->y;

	pitch = dst->pitch/dst->format->BytesPerPixel;

	/* Set up the blit direction (sign) flags */

	sign = 0;

	if ( srcX < dstX ) {

		sign |= 1;

	}

	if ( srcY < dstY ) {

		sign |= 4;

		srcY += (h - 1);

		dstY += (h - 1);

	}

	/* Set up the blit source row start, end, and skip (in pixels) */

	stop = start = (srcY * pitch) + srcX;

	if ( srcX < dstX ) {

		start += (w - 1);

	} else {

		stop  += (w - 1);

	}

	if ( srcY < dstY ) {

		skip = -pitch;

	} else {

		skip = pitch;

	}

	/* Set up the blit operation */

	if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {

		Uint32 colorkey;

		blitop = MGADWG_BFCOL | MGADWG_BITBLT |

		         MGADWG_SHIFTZERO | MGADWG_RSTR | (0x0C << 16) |

		         MGADWG_TRANSC;

		colorkey = src->format->colorkey;

		switch (dst->format->BytesPerPixel) {

		    case 1:

			colorkey |= (colorkey<<8);

		    case 2:

			colorkey |= (colorkey<<16);

			break;

		}

		mga_wait(2);

		mga_out32(MGAREG_FCOL, colorkey);

		mga_out32(MGAREG_BCOL, 0xFFFFFFFF);

	} else {

		blitop = MGADWG_BFCOL | MGADWG_BITBLT |

		         MGADWG_SHIFTZERO | MGADWG_RSTR | (0x0C << 16);

	}

	mga_wait(7);

	mga_out32(MGAREG_SGN, sign);

	mga_out32(MGAREG_AR3, start);

	mga_out32(MGAREG_AR0, stop);

	mga_out32(MGAREG_AR5, skip);

	mga_out32(MGAREG_FXBNDRY, (dstX | ((dstX + w-1) << 16)));

	mga_out32(MGAREG_YDSTLEN, (dstY << 16) | h);

	mga_out32(MGAREG_DWGCTL + MGAREG_EXEC, blitop);

	FB_AddBusySurface(src);

	FB_AddBusySurface(dst);

	if ( dst == this->screen ) {

		SDL_mutexV(hw_lock);

	}

	return(0);

}

static int CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)

{

	int accelerated;

	/* Set initial acceleration on */

	src->flags |= SDL_HWACCEL;

	/* Set the surface attributes */

	if ( (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {

		if ( ! this->info.blit_hw_A ) {

			src->flags &= ~SDL_HWACCEL;

		}

	}

	if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {

		if ( ! this->info.blit_hw_CC ) {

			src->flags &= ~SDL_HWACCEL;

		}

	}

	/* Check to see if final surface blit is accelerated */

	accelerated = !!(src->flags & SDL_HWACCEL);

	if ( accelerated ) {

		src->map->hw_blit = HWAccelBlit;

	}

	return(accelerated);

}

void FB_MatroxAccel(_THIS, __u32 card)

{

	/* We have hardware accelerated surface functions */

	this->CheckHWBlit = CheckHWBlit;

	wait_vbl = WaitVBL;

	wait_idle = WaitIdle;

	/* The Matrox has an accelerated color fill */

	this->info.blit_fill = 1;

	this->FillHWRect = FillHWRect;

	/* The Matrox has accelerated normal and colorkey blits. */

	this->info.blit_hw = 1;

	/* The Millenium I appears to do the colorkey test a word

	   at a time, and the transparency is intverted. (?)

	 */

	if ( card != FB_ACCEL_MATROX_MGA2064W ) {

		this->info.blit_hw_CC = 1;

		this->SetHWColorKey = SetHWColorKey;

	}

#if 0 /* Not yet implemented? */

	/* The Matrox G200/G400 has an accelerated alpha blit */

	if ( (card == FB_ACCEL_MATROX_MGAG200)

	  || (card == FB_ACCEL_MATROX_MGAG400)

	) {

		this->info.blit_hw_A = 1;

		this->SetHWAlpha = SetHWAlpha;

	}

#endif

}