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_fb3dfx.h"

#include "3dfx_mmio.h"

/* Wait for vertical retrace */

static void WaitVBL(_THIS)

{

/* find start of retrace */

tdfx_waitidle();

while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == STATUS_RETRACE )

;

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

while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == 0 )

;

}

static void WaitIdle(_THIS)

{

tdfx_waitidle();

}

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

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

{

return(0);

}

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

{

int bpp;

Uint32 format;

int dstX, dstY;

if ( switched_away ) {

return -2; /* no hardware access */

}

if ( dst == this->screen ) {

SDL_mutexP(hw_lock);

}

bpp = dst->format->BitsPerPixel;

format = dst->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);

/* Calculate source and destination base coordinates */

dstX = rect->x;

dstY = rect->y;

/* Execute the fill command */

tdfx_wait(6);

tdfx_out32(DSTFORMAT, format);

tdfx_out32(COLORFORE, color);

tdfx_out32(COMMAND_2D, COMMAND_2D_FILLRECT);

tdfx_out32(DSTSIZE, rect->w | (rect->h << 16));

tdfx_out32(LAUNCH_2D, dstX | (dstY << 16));

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)

{

int bpp;

Uint32 src_format;

Uint32 src_base;

Uint32 dst_base;

int srcX, srcY;

int dstX, dstY;

Uint32 blitop;

Uint32 use_colorkey;

if ( switched_away ) {

return -2; /* no hardware access */

}

if ( dst == this->screen ) {

SDL_mutexP(hw_lock);

}

bpp = src->format->BitsPerPixel;

src_format = src->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);

bpp = dst->format->BitsPerPixel;

srcX = srcrect->x;

srcY = srcrect->y;

dstX = dstrect->x;

dstY = dstrect->y;

/* Assemble the blit operation */

blitop = COMMAND_2D_BITBLT | (0xCC << 24);

if ( srcX <= dstX ) {

blitop |= BIT(14);

srcX += (dstrect->w - 1);

dstX += (dstrect->w - 1);

}

if ( srcY <= dstY ) {

blitop |= BIT(15);

srcY += (dstrect->h - 1);

dstY += (dstrect->h - 1);

}

/* Perform the blit! */

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

tdfx_wait(3);

tdfx_out32(SRCCOLORKEYMIN, src->format->colorkey);

tdfx_out32(SRCCOLORKEYMAX, src->format->colorkey);

tdfx_out32(ROP_2D, 0xAA00);

use_colorkey = 1;

} else {

use_colorkey = 0;

}

tdfx_wait(9);

tdfx_out32(SRCBASE, (Uint32)src_base);

tdfx_out32(SRCFORMAT, src_format);

tdfx_out32(DSTBASE, (Uint32)dst_base);

tdfx_out32(DSTFORMAT, src_format);

tdfx_out32(COMMAND_2D, blitop);

tdfx_out32(COMMANDEXTRA_2D, use_colorkey);

tdfx_out32(DSTSIZE, dstrect->w | (dstrect->h << 16));

tdfx_out32(DSTXY, dstX | (dstY << 16));

tdfx_out32(LAUNCH_2D, srcX | (srcY << 16));

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_3DfxAccel(_THIS, __u32 card)

{

/* We have hardware accelerated surface functions */

this->CheckHWBlit = CheckHWBlit;

wait_vbl = WaitVBL;

/* Reset the 3Dfx controller */

tdfx_out32(BRESERROR0, 0);

tdfx_out32(BRESERROR1, 0);

/* The 3Dfx has an accelerated color fill */

this->info.blit_fill = 1;

this->FillHWRect = FillHWRect;

/* The 3Dfx has accelerated normal and colorkey blits */

this->info.blit_hw = 1;

this->info.blit_hw_CC = 1;

this->SetHWColorKey = SetHWColorKey;

}