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comparison src/video/svga/SDL_svgavideo.c @ 205:13161d3d349d

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Added double-buffering support for SVGAlib (thanks Kutak!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 14 Oct 2001 19:49:02 +0000
parents 3647c809813d
children bb72c418a1f9
comparison
equal deleted inserted replaced
204:62bad9a82022 205:13161d3d349d
143 device->FillHWRect = NULL; 143 device->FillHWRect = NULL;
144 device->SetHWColorKey = NULL; 144 device->SetHWColorKey = NULL;
145 device->SetHWAlpha = NULL; 145 device->SetHWAlpha = NULL;
146 device->LockHWSurface = SVGA_LockHWSurface; 146 device->LockHWSurface = SVGA_LockHWSurface;
147 device->UnlockHWSurface = SVGA_UnlockHWSurface; 147 device->UnlockHWSurface = SVGA_UnlockHWSurface;
148 device->FlipHWSurface = NULL; 148 device->FlipHWSurface = SVGA_FlipHWSurface;
149 device->FreeHWSurface = SVGA_FreeHWSurface; 149 device->FreeHWSurface = SVGA_FreeHWSurface;
150 device->SetCaption = NULL; 150 device->SetCaption = NULL;
151 device->SetIcon = NULL; 151 device->SetIcon = NULL;
152 device->IconifyWindow = NULL; 152 device->IconifyWindow = NULL;
153 device->GrabInput = NULL; 153 device->GrabInput = NULL;
221 vga_modeinfo *modeinfo; 221 vga_modeinfo *modeinfo;
222 222
223 this->info.wm_available = 0; 223 this->info.wm_available = 0;
224 this->info.hw_available = 1; 224 this->info.hw_available = 1;
225 modeinfo = vga_getmodeinfo(vga_getcurrentmode()); 225 modeinfo = vga_getmodeinfo(vga_getcurrentmode());
226 this->info.video_mem = (modeinfo->maxpixels/1024); 226 this->info.video_mem = modeinfo->memory;
227 if ( modeinfo->bytesperpixel > 0 ) {
228 this->info.video_mem *= modeinfo->bytesperpixel;
229 }
230 /* FIXME: Add hardware accelerated blit information */ 227 /* FIXME: Add hardware accelerated blit information */
231 #if 0 228 #if 0
232 printf("Hardware accelerated blit: %savailable\n", modeinfo->haveblit ? "" : "not "); 229 printf("Hardware accelerated blit: %savailable\n", modeinfo->haveblit ? "" : "not ");
233 #endif 230 #endif
234 } 231 }
345 int width, int height, int bpp, Uint32 flags) 342 int width, int height, int bpp, Uint32 flags)
346 { 343 {
347 int mode; 344 int mode;
348 int vgamode; 345 int vgamode;
349 vga_modeinfo *modeinfo; 346 vga_modeinfo *modeinfo;
347 int screenpage_len;
350 348
351 /* Try to set the requested linear video mode */ 349 /* Try to set the requested linear video mode */
352 bpp = (bpp+7)/8-1; 350 bpp = (bpp+7)/8-1;
353 for ( mode=0; SDL_modelist[bpp][mode]; ++mode ) { 351 for ( mode=0; SDL_modelist[bpp][mode]; ++mode ) {
354 if ( (SDL_modelist[bpp][mode]->w == width) && 352 if ( (SDL_modelist[bpp][mode]->w == width) &&
391 current->w = width; 389 current->w = width;
392 current->h = height; 390 current->h = height;
393 current->pitch = modeinfo->linewidth; 391 current->pitch = modeinfo->linewidth;
394 current->pixels = vga_getgraphmem(); 392 current->pixels = vga_getgraphmem();
395 393
394 /* set double-buffering */
395 if ( flags & SDL_DOUBLEBUF )
396 {
397 /* length of one screen page in bytes */
398 screenpage_len=current->h*modeinfo->linewidth;
399
400 /* if start address should be aligned */
401 if ( modeinfo->linewidth_unit )
402 {
403 if ( screenpage_len % modeinfo->linewidth_unit )
404 {
405 screenpage_len += modeinfo->linewidth_unit - ( screenpage_len % modeinfo->linewidth_unit );
406 }
407 }
408
409 /* if we heve enough videomemory = ak je dost videopamete */
410 if ( modeinfo->memory > ( screenpage_len * 2 / 1024 ) )
411 {
412 current->flags |= SDL_DOUBLEBUF;
413 flip_page = 0;
414 flip_offset[0] = 0;
415 flip_offset[1] = screenpage_len;
416 flip_address[0] = vga_getgraphmem();
417 flip_address[1] = flip_address[0]+screenpage_len;
418 SVGA_FlipHWSurface(this,current);
419 }
420 }
421
396 /* Set the blit function */ 422 /* Set the blit function */
397 this->UpdateRects = SVGA_DirectUpdate; 423 this->UpdateRects = SVGA_DirectUpdate;
398 424
399 /* Set up the mouse handler again (buggy SVGAlib 1.40) */ 425 /* Set up the mouse handler again (buggy SVGAlib 1.40) */
400 mouse_seteventhandler(SVGA_mousecallback); 426 mouse_seteventhandler(SVGA_mousecallback);
414 } 440 }
415 441
416 /* We need to wait for vertical retrace on page flipped displays */ 442 /* We need to wait for vertical retrace on page flipped displays */
417 static int SVGA_LockHWSurface(_THIS, SDL_Surface *surface) 443 static int SVGA_LockHWSurface(_THIS, SDL_Surface *surface)
418 { 444 {
419 if ( (surface->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) { 445 /* The waiting is done in SVGA_FlipHWSurface() */
420 vga_waitretrace();
421 }
422 return(0); 446 return(0);
423 } 447 }
424 static void SVGA_UnlockHWSurface(_THIS, SDL_Surface *surface) 448 static void SVGA_UnlockHWSurface(_THIS, SDL_Surface *surface)
425 { 449 {
426 return; 450 return;
427 } 451 }
428 452
429 /* FIXME: How is this done with SVGAlib? */
430 static int SVGA_FlipHWSurface(_THIS, SDL_Surface *surface) 453 static int SVGA_FlipHWSurface(_THIS, SDL_Surface *surface)
431 { 454 {
455 vga_setdisplaystart(flip_offset[flip_page]);
456 flip_page=!flip_page;
457 surface->pixels=flip_address[flip_page];
458 vga_waitretrace();
432 return(0); 459 return(0);
433 } 460 }
434 461
435 static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects) 462 static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)
436 { 463 {
485 if ( this->screen && (this->screen->flags & SDL_HWSURFACE) ) { 512 if ( this->screen && (this->screen->flags & SDL_HWSURFACE) ) {
486 /* Direct screen access, no memory buffer */ 513 /* Direct screen access, no memory buffer */
487 this->screen->pixels = NULL; 514 this->screen->pixels = NULL;
488 } 515 }
489 } 516 }
517