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gfx.cpp: memset less memory at once for FirstSprite+Y, accelerating sprite rendering if not all lines have sprites.

This commit is contained in:
Nebuleon Fumika 2013-04-15 22:25:27 -04:00 committed by Brandon Wright
parent 8384891515
commit c64bfbf614
1 changed files with 30 additions and 16 deletions
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16
gfx.cpp
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@ -900,7 +900,13 @@ static void SetupOBJ (void)
{
// First, find out which sprites are on which lines
uint8 OBJOnLine[SNES_HEIGHT_EXTENDED][128];
memset(OBJOnLine, 0, sizeof(OBJOnLine));
// memset(OBJOnLine, 0, sizeof(OBJOnLine));
/* Hold on here, that's a lot of bytes to initialise at once!
* So we only initialise them per line, as needed. [Neb]
* Bonus: We can quickly avoid looping if a line has no OBJs.
*/
bool8 AnyOBJOnLine[SNES_HEIGHT_EXTENDED];
memset(AnyOBJOnLine, FALSE, sizeof(AnyOBJOnLine)); // better
for (S = 0; S < 128; S++)
{
@ -934,6 +940,11 @@ static void SetupOBJ (void)
if (Y >= SNES_HEIGHT_EXTENDED)
continue;
if (!AnyOBJOnLine[Y]) {
memset(OBJOnLine[Y], 0, sizeof(OBJOnLine[Y]));
AnyOBJOnLine[Y] = TRUE;
}
if (PPU.OBJ[S].VFlip)
// Yes, Width not Height. It so happens that the
// sprites with H=2*W flip as two WxW sprites.
@ -955,6 +966,8 @@ static void SetupOBJ (void)
S = FirstSprite;
j = 0;
if (AnyOBJOnLine[Y])
{
do
{
if (OBJOnLine[Y][S])
@ -974,6 +987,7 @@ static void SetupOBJ (void)
S = (S + 1) & 0x7f;
} while (S != FirstSprite);
}
if (j < 32)
GFX.OBJLines[Y].OBJ[j].Sprite = -1;