2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
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.
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.
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
22 #include "SDL_config.h"
24 #include "SDL_video.h"
25 #include "../SDL_blit.h"
26 #include "SDL_fb3dfx.h"
27 #include "3dfx_mmio.h"
30 /* Wait for vertical retrace */
31 static void WaitVBL(_THIS)
33 /* find start of retrace */
35 while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == STATUS_RETRACE )
37 /* wait until we're past the start */
38 while( (tdfx_in32(TDFX_STATUS) & STATUS_RETRACE) == 0 )
41 static void WaitIdle(_THIS)
46 /* Sets video mem colorkey and accelerated blit function */
47 static int SetHWColorKey(_THIS, SDL_Surface *surface, Uint32 key)
52 static int FillHWRect(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color)
59 /* Don't blit to the display surface when switched away */
60 if ( switched_away ) {
61 return -2; /* no hardware access */
63 if ( dst == this->screen ) {
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);
72 /* Calculate source and destination base coordinates */
76 /* Execute the fill command */
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));
85 FB_AddBusySurface(dst);
87 if ( dst == this->screen ) {
93 static int HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,
94 SDL_Surface *dst, SDL_Rect *dstrect)
96 SDL_VideoDevice *this = current_video;
107 /* Don't blit to the display surface when switched away */
108 if ( switched_away ) {
109 return -2; /* no hardware access */
111 if ( dst == this->screen ) {
115 /* Set the source and destination pixel format */
116 src_base = ((char *)src->pixels - mapped_mem);
117 bpp = src->format->BitsPerPixel;
118 src_format = src->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);
119 dst_base = ((char *)dst->pixels - mapped_mem);
120 bpp = dst->format->BitsPerPixel;
121 dst_format = dst->pitch | ((bpp+((bpp==8) ? 0 : 8)) << 13);
128 /* Assemble the blit operation */
129 blitop = COMMAND_2D_BITBLT | (0xCC << 24);
130 if ( srcX <= dstX ) {
132 srcX += (dstrect->w - 1);
133 dstX += (dstrect->w - 1);
135 if ( srcY <= dstY ) {
137 srcY += (dstrect->h - 1);
138 dstY += (dstrect->h - 1);
141 /* Perform the blit! */
142 if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
144 tdfx_out32(SRCCOLORKEYMIN, src->format->colorkey);
145 tdfx_out32(SRCCOLORKEYMAX, src->format->colorkey);
146 tdfx_out32(ROP_2D, 0xAA00);
152 tdfx_out32(SRCBASE, (Uint32)src_base);
153 tdfx_out32(SRCFORMAT, src_format);
154 tdfx_out32(DSTBASE, (Uint32)dst_base);
155 tdfx_out32(DSTFORMAT, src_format);
156 tdfx_out32(COMMAND_2D, blitop);
157 tdfx_out32(COMMANDEXTRA_2D, use_colorkey);
158 tdfx_out32(DSTSIZE, dstrect->w | (dstrect->h << 16));
159 tdfx_out32(DSTXY, dstX | (dstY << 16));
160 tdfx_out32(LAUNCH_2D, srcX | (srcY << 16));
162 FB_AddBusySurface(src);
163 FB_AddBusySurface(dst);
165 if ( dst == this->screen ) {
171 static int CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)
175 /* Set initial acceleration on */
176 src->flags |= SDL_HWACCEL;
178 /* Set the surface attributes */
179 if ( (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
180 if ( ! this->info.blit_hw_A ) {
181 src->flags &= ~SDL_HWACCEL;
184 if ( (src->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
185 if ( ! this->info.blit_hw_CC ) {
186 src->flags &= ~SDL_HWACCEL;
190 /* Check to see if final surface blit is accelerated */
191 accelerated = !!(src->flags & SDL_HWACCEL);
193 src->map->hw_blit = HWAccelBlit;
198 void FB_3DfxAccel(_THIS, __u32 card)
200 /* We have hardware accelerated surface functions */
201 this->CheckHWBlit = CheckHWBlit;
203 wait_idle = WaitIdle;
205 /* Reset the 3Dfx controller */
206 tdfx_out32(BRESERROR0, 0);
207 tdfx_out32(BRESERROR1, 0);
209 /* The 3Dfx has an accelerated color fill */
210 this->info.blit_fill = 1;
211 this->FillHWRect = FillHWRect;
213 /* The 3Dfx has accelerated normal and colorkey blits */
214 this->info.blit_hw = 1;
215 this->info.blit_hw_CC = 1;
216 this->SetHWColorKey = SetHWColorKey;