/*

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_fbriva.h"

#include "riva_mmio.h"

#include "riva_regs.h"

static int FifoEmptyCount = 0;

static int FifoFreeCount = 0;

/* Wait for vertical retrace */

static void WaitVBL(_THIS)

{

volatile Uint8 *port = (Uint8 *)(mapped_io + PCIO_OFFSET + 0x3DA);

while ( (*port & 0x08) )

;

while ( !(*port & 0x08) )

;

}

static void NV3WaitIdle(_THIS)

{

RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);

while ( (Rop->FifoFree < FifoEmptyCount) ||

(*(mapped_io + PGRAPH_OFFSET + 0x000006B0) & 0x01) )

;

}

static void NV4WaitIdle(_THIS)

{

RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);

while ( (Rop->FifoFree < FifoEmptyCount) ||

(*(mapped_io + PGRAPH_OFFSET + 0x00000700) & 0x01) )

;

}

#if 0 /* Not yet implemented? */

/* 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 */

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

{

return(0);

}

#endif /* Not yet implemented */

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

{

int dstX, dstY;

int dstW, dstH;

RivaBitmap *Bitmap = (RivaBitmap *)(mapped_io + BITMAP_OFFSET);

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

if ( dst == this->screen ) {

SDL_mutexP(hw_lock);

}

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

dstW = rect->w;

dstH = rect->h;

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

/* Adjust for the current rectangle */

dstX += rect->x;

dstY += rect->y;

RIVA_FIFO_FREE(Bitmap, 1);

Bitmap->Color1A = color;

RIVA_FIFO_FREE(Bitmap, 2);

Bitmap->UnclippedRectangle[0].TopLeft = (dstX << 16) | dstY;

Bitmap->UnclippedRectangle[0].WidthHeight = (dstW << 16) | dstH;

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 srcX, srcY;

int dstX, dstY;

int dstW, dstH;

RivaScreenBlt *Blt = (RivaScreenBlt *)(mapped_io + BLT_OFFSET);

/* 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) */

dstW = dstrect->w;

dstH = 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;

RIVA_FIFO_FREE(Blt, 3);

Blt->TopLeftSrc = (srcY << 16) | srcX;

Blt->TopLeftDst = (dstY << 16) | dstX;

Blt->WidthHeight = (dstH << 16) | dstW;

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_RivaAccel(_THIS, __u32 card)

{

RivaRop *Rop = (RivaRop *)(mapped_io + ROP_OFFSET);

/* We have hardware accelerated surface functions */

this->CheckHWBlit = CheckHWBlit;

wait_vbl = WaitVBL;

switch (card) {

case FB_ACCEL_NV3:

wait_idle = NV3WaitIdle;

break;

case FB_ACCEL_NV4:

wait_idle = NV4WaitIdle;

break;

default:

/* Hmm... FIXME */

break;

}

FifoEmptyCount = Rop->FifoFree;

/* The Riva has an accelerated color fill */

this->info.blit_fill = 1;

this->FillHWRect = FillHWRect;

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

this->info.blit_hw = 1;

#if 0 /* Not yet implemented? */

this->info.blit_hw_CC = 1;

this->SetHWColorKey = SetHWColorKey;

#endif

#if 0 /* Not yet implemented? */

/* The Riva has an accelerated alpha blit */

this->info.blit_hw_A = 1;

this->SetHWAlpha = SetHWAlpha;

#endif

}