/*

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_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 ( 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 ( 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

}