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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 #include "SDL_video.h"
     25 #include "../SDL_blit.h"
     26 #include "SDL_fb3dfx.h"
     27 #include "3dfx_mmio.h"
     28 
     29 
     30 /* Wait for vertical retrace */
     31 static void WaitVBL(_THIS)
     32 {
     33 	/* find start of retrace */
     34 	tdfx_waitidle();
     35 	while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == STATUS_RETRACE )
     36 		;
     37 	/* wait until we're past the start */
     38 	while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == 0 )
     39 		;
     40 }
     41 static void WaitIdle(_THIS)
     42 {
     43 	tdfx_waitidle();
     44 }
     45 
     46 /* Sets video mem colorkey and accelerated blit function */
     47 static int SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key)
     48 {
     49 	return(0);
     50 }
     51 
     52 static int FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color)
     53 {
     54 	int bpp;
     55 	Uint32 dst_base;
     56 	Uint32 format;
     57 	int dstX, dstY;
     58 
     59 	/* Don't blit to the display surface when switched away */
     60 	if ( switched_away ) {
     61 		return -2; /* no hardware access */
     62 	}
     63 	if ( dst == this->screen ) {
     64 		SDL_mutexP(hw_lock);
     65 	}
     66 
     67 	/* Set the destination pixel format */
     68 	dst_base = ((char *)dst->pixels - mapped_mem);
     69 	bpp = dst->format->BitsPerPixel;
     70 	format = dst->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);
     71 
     72 	/* Calculate source and destination base coordinates */
     73 	dstX = rect->x;
     74 	dstY = rect->y;
     75 
     76 	/* Execute the fill command */
     77 	tdfx_wait(6);
     78 	tdfx_out32(DSTBASE, dst_base);
     79 	tdfx_out32(DSTFORMAT, format);
     80 	tdfx_out32(COLORFORE, color);
     81 	tdfx_out32(COMMAND_2D, COMMAND_2D_FILLRECT);
     82 	tdfx_out32(DSTSIZE, rect->w | (rect->h << 16));
     83 	tdfx_out32(LAUNCH_2D, dstX | (dstY << 16));
     84 
     85 	FB_AddBusySurface(dst);
     86 
     87 	if ( dst == this->screen ) {
     88 		SDL_mutexV(hw_lock);
     89 	}
     90 	return(0);
     91 }
     92 
     93 static int HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,
     94                        SDL_Surface *dst, SDL_Rect *dstrect)
     95 {
     96 	SDL_VideoDevice *this = current_video;
     97 	int bpp;
     98 	Uint32 src_format;
     99 	Uint32 src_base;
    100 	Uint32 dst_base;
    101 	int srcX, srcY;
    102 	int dstX, dstY;
    103 	Uint32 blitop;
    104 	Uint32 use_colorkey;
    105 
    106 	/* Don't blit to the display surface when switched away */
    107 	if ( switched_away ) {
    108 		return -2; /* no hardware access */
    109 	}
    110 	if ( dst == this->screen ) {
    111 		SDL_mutexP(hw_lock);
    112 	}
    113 
    114 	/* Set the source and destination pixel format */
    115 	src_base = ((char *)src->pixels - mapped_mem);
    116 	bpp = src->format->BitsPerPixel;
    117 	src_format = src->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);
    118 	dst_base = ((char *)dst->pixels - mapped_mem);
    119 	bpp = dst->format->BitsPerPixel;
    120 
    121 	srcX = srcrect->x;
    122 	srcY = srcrect->y;
    123 	dstX = dstrect->x;
    124 	dstY = dstrect->y;
    125 
    126 	/* Assemble the blit operation */
    127 	blitop = COMMAND_2D_BITBLT | (0xCC << 24);
    128 	if ( srcX <= dstX ) {
    129 		blitop |= BIT(14);
    130 		srcX += (dstrect->w - 1);
    131 		dstX += (dstrect->w - 1);
    132 	}
    133 	if ( srcY <= dstY ) {
    134 		blitop |= BIT(15);
    135 		srcY += (dstrect->h - 1);
    136 		dstY += (dstrect->h - 1);
    137 	}
    138 
    139 	/* Perform the blit! */
    140 	if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
    141     		tdfx_wait(3);
    142     		tdfx_out32(SRCCOLORKEYMIN, src->format->colorkey);
    143     		tdfx_out32(SRCCOLORKEYMAX, src->format->colorkey);
    144     		tdfx_out32(ROP_2D, 0xAA00);
    145 		use_colorkey = 1;
    146 	} else {
    147 		use_colorkey = 0;
    148 	}
    149 	tdfx_wait(9);
    150 	tdfx_out32(SRCBASE, (Uint32)src_base);
    151 	tdfx_out32(SRCFORMAT, src_format);
    152 	tdfx_out32(DSTBASE, (Uint32)dst_base);
    153 	tdfx_out32(DSTFORMAT, src_format);
    154 	tdfx_out32(COMMAND_2D, blitop);
    155 	tdfx_out32(COMMANDEXTRA_2D, use_colorkey);
    156 	tdfx_out32(DSTSIZE, dstrect->w | (dstrect->h << 16));
    157 	tdfx_out32(DSTXY, dstX | (dstY << 16));
    158 	tdfx_out32(LAUNCH_2D, srcX | (srcY << 16));
    159 
    160 	FB_AddBusySurface(src);
    161 	FB_AddBusySurface(dst);
    162 
    163 	if ( dst == this->screen ) {
    164 		SDL_mutexV(hw_lock);
    165 	}
    166 	return(0);
    167 }
    168 
    169 static int CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)
    170 {
    171 	int accelerated;
    172 
    173 	/* Set initial acceleration on */
    174 	src->flags |= SDL_HWACCEL;
    175 
    176 	/* Set the surface attributes */
    177 	if ( (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
    178 		if ( ! this->info.blit_hw_A ) {
    179 			src->flags &= ~SDL_HWACCEL;
    180 		}
    181 	}
    182 	if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
    183 		if ( ! this->info.blit_hw_CC ) {
    184 			src->flags &= ~SDL_HWACCEL;
    185 		}
    186 	}
    187 
    188 	/* Check to see if final surface blit is accelerated */
    189 	accelerated = !!(src->flags & SDL_HWACCEL);
    190 	if ( accelerated ) {
    191 		src->map->hw_blit = HWAccelBlit;
    192 	}
    193 	return(accelerated);
    194 }
    195 
    196 void FB_3DfxAccel(_THIS, __u32 card)
    197 {
    198 	/* We have hardware accelerated surface functions */
    199 	this->CheckHWBlit = CheckHWBlit;
    200 	wait_vbl = WaitVBL;
    201 	wait_idle = WaitIdle;
    202 
    203 	/* Reset the 3Dfx controller */
    204 	tdfx_out32(BRESERROR0, 0);
    205 	tdfx_out32(BRESERROR1, 0);
    206 
    207 	/* The 3Dfx has an accelerated color fill */
    208 	this->info.blit_fill = 1;
    209 	this->FillHWRect = FillHWRect;
    210 
    211 	/* The 3Dfx has accelerated normal and colorkey blits */
    212 	this->info.blit_hw = 1;
    213 	this->info.blit_hw_CC = 1;
    214 	this->SetHWColorKey = SetHWColorKey;
    215 }
    216