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VIDEO: Stretch frame buffer to accomodate output window.

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This commit is contained in:
Lars Brinkhoff 2020-07-08 08:28:38 +02:00
parent d93bfe62de
commit 6ca7a938ad
1 changed files with 24 additions and 7 deletions
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31
sim_video.c
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@ -1418,21 +1418,38 @@ else
return SCPE_OK; return SCPE_OK;
} }
static void vid_stretch(SDL_Rect *r)
{
/* Return in r a rectangle with the same aspect ratio as the video
buffer but scaled to fit precisely in the output window. Normally,
the buffer and the window have the same sizes, but if the window is
resized, or fullscreen is in effect, they are not. */
int w, h;
SDL_GetRendererOutputSize(vid_renderer, &w, &h);
if ((double)h / vid_height < (double)w / vid_width) {
r->w = vid_width * h / vid_height;
r->h = h;
r->x = (w - r->w) / 2;
r->y = 0;
}
else {
r->w = w;
r->h = vid_height * w / vid_width;
r->x = 0;
r->y = (h - r->h) / 2;
}
}
void vid_update (void) void vid_update (void)
{ {
SDL_Rect vid_dst; SDL_Rect vid_dst;
vid_stretch(&vid_dst);
vid_dst.x = 0;
vid_dst.y = 0;
vid_dst.w = vid_width;
vid_dst.h = vid_height;
sim_debug (SIM_VID_DBG_VIDEO, vid_dev, "Video Update Event: \n"); sim_debug (SIM_VID_DBG_VIDEO, vid_dev, "Video Update Event: \n");
if (sim_deb) if (sim_deb)
fflush (sim_deb); fflush (sim_deb);
if (SDL_RenderClear (vid_renderer)) if (SDL_RenderClear (vid_renderer))
sim_printf ("%s: Video Update Event: SDL_RenderClear error: %s\n", vid_dname(vid_dev), SDL_GetError()); sim_printf ("%s: Video Update Event: SDL_RenderClear error: %s\n", vid_dname(vid_dev), SDL_GetError());
if (SDL_RenderCopy (vid_renderer, vid_texture, NULL, NULL)) if (SDL_RenderCopy (vid_renderer, vid_texture, NULL, &vid_dst))
sim_printf ("%s: Video Update Event: SDL_RenderCopy error: %s\n", vid_dname(vid_dev), SDL_GetError()); sim_printf ("%s: Video Update Event: SDL_RenderCopy error: %s\n", vid_dname(vid_dev), SDL_GetError());
SDL_RenderPresent (vid_renderer); SDL_RenderPresent (vid_renderer);
} }