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vdp mode 4, optimisation

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This commit is contained in:
kub 2020-07-29 20:47:16 +02:00
parent a97dd5cded
commit b74303b1a7
1 changed files with 12 additions and 16 deletions
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28
pico/mode4.c
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@ -19,6 +19,12 @@ static void (*FinalizeLineM4)(int line);
static int skip_next_line;
static int screen_offset;
static void TileBGM4(int sx, int pal)
{
u32 *pd = (u32 *)(Pico.est.HighCol + sx);
pd[0] = pd[1] = pal ? 0x10101010 : 0;
}
#define PLANAR_PIXELL(x,p) \
t = pack & (0x80808080 >> p); \
t = ((t >> (7-p)) | (t >> (14-p)) | (t >> (21-p)) | (t >> (28-p))) & 0x0f; \
@ -104,7 +110,7 @@ static void draw_sprites(int scanline)
if (pv->reg[0] & 8)
xoff = 0;
if (!(PicoIn.opt & POPT_DIS_32C_BORDER))
if (!FinalizeLineM4 && !(PicoIn.opt & POPT_DIS_32C_BORDER))
xoff += 32;
sat = (unsigned char *)PicoMem.vram + ((pv->reg[5] & 0x7e) << 7);
@ -145,10 +151,11 @@ static void draw_sprites(int scanline)
}
}
// tilex_ty_prio merged to reduce register pressure
static void draw_strip_low(const unsigned short *nametab, int dx, int cells, int tilex_ty_prio)
{
int oldcode = -1, blank = -1; // The tile we know is blank
int oldcode = -1;
int addr = 0, pal = 0;
// Draw tiles across screen:
@ -158,12 +165,6 @@ static void draw_strip_low(const unsigned short *nametab, int dx, int cells, int
int code;
code = nametab[tilex_ty_prio & 0x1f];
if (code == blank)
continue;
/*
if ((code ^ tilex_ty_prio) & 0x1000) // priority differs?
continue;
*/
if (code != oldcode) {
oldcode = code;
@ -177,14 +178,9 @@ static void draw_strip_low(const unsigned short *nametab, int dx, int cells, int
}
pack = *(unsigned int *)(PicoMem.vram + addr); /* Get 4 bitplanes / 8 pixels */
/*
if (pack == 0) {
blank = code;
continue;
}
*/
if (code & 0x0200) TileFlipM4Low(dx, pack, pal);
else TileNormM4Low(dx, pack, pal);
if (pack == 0) TileBGM4(dx, pal);
else if (code & 0x0200) TileFlipM4Low(dx, pack, pal);
else TileNormM4Low(dx, pack, pal);
}
}
// tilex_ty_prio merged to reduce register pressure