/*

    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_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 dst_base;

	Uint32 format;

	int dstX, dstY;

	/* 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);

	}

	/* Set the destination pixel format */

	dst_base = ((char *)dst->pixels - mapped_mem);

	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(DSTBASE, dst_base);

	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)

{

	SDL_VideoDevice *this = current_video;

	int bpp;

	Uint32 src_format;

	Uint32 dst_format;

	Uint32 src_base;

	Uint32 dst_base;

	int srcX, srcY;

	int dstX, dstY;

	Uint32 blitop;

	Uint32 use_colorkey;

	/* 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);

	}

	/* Set the source and destination pixel format */

	src_base = ((char *)src->pixels - mapped_mem);

	bpp = src->format->BitsPerPixel;

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

	dst_base = ((char *)dst->pixels - mapped_mem);

	bpp = dst->format->BitsPerPixel;

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

	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;

	wait_idle = WaitIdle;

	/* 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;

}