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SDL layer: in 8-bit mode, defer setting the palette until showing the next frame.

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CON code sometimes uses 'setgamepalette' from withing actors, which is a bit too
frequent.  Deferring the actual palette updating means that multiple requests in
between two screen redraws are coalesced into one, which is desirable for
performance reasons and for the reduction of 'tearing' artefacts (but not
prevention, since the drawing isn't synced to the screen refresh rate with
vsync off).

(Did-not-)update issues might be introduced.

Windows isn't touched because
 - I expect it to be more brittle, especially in light of the ATI HW gamma
   problems.
 - I haven't tested whether the particular performance penalty that lead to this
   change ('gas' in AMC TC) exists there too

git-svn-id: https://svn.eduke32.com/eduke32@2221 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2011-12-28 20:34:41 +00:00
parent 9e1399ec14
commit 4ae50ef22a
1 changed files with 17 additions and 7 deletions
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24
polymer/eduke32/build/src/sdlayer.c
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@ -1397,6 +1397,8 @@ void enddrawing(void)
if (SDL_MUSTLOCK(sdl_surface)) SDL_UnlockSurface(sdl_surface);
}
static int32_t needpalupdate;
static SDL_Color sdlayer_pal[256];
//
// showframe() -- update the display
@ -1451,6 +1453,15 @@ void showframe(int32_t w)
while (lockcount) enddrawing();
}
// deferred palette updating
if (needpalupdate)
{
SDL_SetColors(sdl_surface, sdlayer_pal, 0, 256);
// same as:
//SDL_SetPalette(sdl_surface, SDL_LOGPAL|SDL_PHYSPAL, pal, 0, 256);
needpalupdate = 0;
}
SDL_Flip(sdl_surface);
}
@ -1460,25 +1471,24 @@ void showframe(int32_t w)
//
int32_t setpalette(int32_t start, int32_t num)
{
SDL_Color pal[256];
int32_t i,n;
if (bpp > 8) return 0; // no palette in opengl
copybuf(curpalettefaded, pal, 256);
Bmemcpy(sdlayer_pal, curpalettefaded, 256*4);
for (i=start, n=num; n>0; i++, n--)
curpalettefaded[i].f = pal[i].unused = 0;
curpalettefaded[i].f = sdlayer_pal[i].unused = 0;
//return SDL_SetPalette(sdl_surface, SDL_LOGPAL|SDL_PHYSPAL, pal, 0, 256);
needpalupdate = 1;
return sdl_surface ? SDL_SetColors(sdl_surface, pal, 0, 256) : 0;
return 0;
}
//
// getpalette() -- get palette values
//
/*
#if 0
int32_t getpalette(int32_t start, int32_t num, char *dapal)
{
int32_t i;
@ -1496,7 +1506,7 @@ int32_t getpalette(int32_t start, int32_t num, char *dapal)
return 1;
}
*/
#endif
//
// setgamma