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sms: more md-consistent drawing

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This commit is contained in:
notaz 2017-10-17 01:01:26 +03:00
parent 1c25c32c11
commit eaa147519f
1 changed files with 34 additions and 42 deletions
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44
pico/mode4.c
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@ -26,14 +26,11 @@ static int screen_offset;
pd[x] = pal|t; \
}
static int TileNormM4(int sx, int addr, int pal)
static void TileNormM4(int sx, unsigned int pack, int pal)
{
unsigned char *pd = Pico.est.HighCol + sx;
unsigned int pack, t;
unsigned int t;
pack = *(unsigned int *)(PicoMem.vram + addr); /* Get 4 bitplanes / 8 pixels */
if (pack)
{
PLANAR_PIXEL(0, 0)
PLANAR_PIXEL(1, 1)
PLANAR_PIXEL(2, 2)
@ -42,20 +39,13 @@ static int TileNormM4(int sx, int addr, int pal)
PLANAR_PIXEL(5, 5)
PLANAR_PIXEL(6, 6)
PLANAR_PIXEL(7, 7)
return 0;
}
return 1; /* Tile blank */
}
static int TileFlipM4(int sx,int addr,int pal)
static void TileFlipM4(int sx, unsigned int pack, int pal)
{
unsigned char *pd = Pico.est.HighCol + sx;
unsigned int pack, t;
unsigned int t;
pack = *(unsigned int *)(PicoMem.vram + addr); /* Get 4 bitplanes / 8 pixels */
if (pack)
{
PLANAR_PIXEL(0, 7)
PLANAR_PIXEL(1, 6)
PLANAR_PIXEL(2, 5)
@ -64,10 +54,6 @@ static int TileFlipM4(int sx,int addr,int pal)
PLANAR_PIXEL(5, 2)
PLANAR_PIXEL(6, 1)
PLANAR_PIXEL(7, 0)
return 0;
}
return 1; /* Tile blank */
}
static void draw_sprites(int scanline)
@ -75,6 +61,7 @@ static void draw_sprites(int scanline)
struct PicoVideo *pv = &Pico.video;
unsigned int sprites_addr[8];
unsigned int sprites_x[8];
unsigned int pack;
unsigned char *sat;
int xoff = 8; // relative to HighCol, which is (screen - 8)
int sprite_base, addr_mask;
@ -115,8 +102,10 @@ static void draw_sprites(int scanline)
pv->status |= SR_C;
// now draw all sprites backwards
for (--s; s >= 0; s--)
TileNormM4(sprites_x[s], sprites_addr[s], 0x10);
for (--s; s >= 0; s--) {
pack = *(unsigned int *)(PicoMem.vram + sprites_addr[s]);
TileNormM4(sprites_x[s], pack, 0x10);
}
}
// tilex_ty_prio merged to reduce register pressure
@ -128,7 +117,8 @@ static void draw_strip(const unsigned short *nametab, int dx, int cells, int til
// Draw tiles across screen:
for (; cells > 0; dx += 8, tilex_ty_prio++, cells--)
{
int code, zero;
unsigned int pack;
int code;
code = nametab[tilex_ty_prio & 0x1f];
if (code == blank)
@ -147,11 +137,13 @@ static void draw_strip(const unsigned short *nametab, int dx, int cells, int til
pal = (code>>7) & 0x10;
}
if (code&0x0200) zero = TileFlipM4(dx, addr, pal);
else zero = TileNormM4(dx, addr, pal);
if (zero)
blank = code; // We know this tile is blank now
pack = *(unsigned int *)(PicoMem.vram + addr); /* Get 4 bitplanes / 8 pixels */
if (pack == 0) {
blank = code;
continue;
}
if (code & 0x0200) TileFlipM4(dx, pack, pal);
else TileNormM4(dx, pack, pal);
}
}