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Implemented 4bpp mode for object RAM, used by Densya de Go 2X credit display

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This commit is contained in:
Angelo Salese 2011-08-22 00:00:11 +00:00
parent 7e95ef4027
commit 9992d37bdf
1 changed files with 45 additions and 13 deletions
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58
src/mame/video/taitojc.c
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@ -77,6 +77,7 @@ WRITE32_HANDLER(taitojc_char_w)
// 0x00: -------- -------- ------xx xxxxxxxx X
// 0x01: ---xxxxx xx------ -------- -------- Palette
// 0x01: -------- --x----- -------- -------- Priority (0 = below 3D, 1 = above 3D)
// 0x01: -------- -------x -------- -------- Color depth (0) 4bpp / (1) 8bpp
// 0x01: -------- -------- -xxxxxxx xxxxxxxx VRAM data address
/*
@ -105,6 +106,9 @@ static void draw_object(running_machine &machine, bitmap_t *bitmap, const rectan
int ix, iy;
UINT32 address;
UINT8 *v;
UINT8 color_depth;
color_depth = (w2 & 0x10000) >> 16;
address = (w2 & 0x7fff) * 0x20;
if (w2 & 0x4000)
@ -163,22 +167,50 @@ static void draw_object(running_machine &machine, bitmap_t *bitmap, const rectan
y2 = cliprect->max_y;
}
for (j=y1; j < y2; j++)
if(!color_depth) // Densya de Go 2X "credit text", 4bpp
{
UINT16 *d = BITMAP_ADDR16(bitmap, j, 0);
int index = (iy * width) + ix;
for (i=x1; i < x2; i++)
for (j=y1; j < y2; j++)
{
UINT8 pen = v[BYTE4_XOR_BE(index)];
if (pen != 0)
{
d[i] = palette + pen;
}
index++;
}
UINT16 *d = BITMAP_ADDR16(bitmap, j, 0);
int index = (iy * (width / 2)) + ix;
iy++;
for (i=x1; i < x2; i+=2)
{
UINT8 pen = (v[BYTE4_XOR_BE(index)] & 0xf0) >> 4;
if (pen != 0)
{
d[i] = palette + pen;
}
pen = (v[BYTE4_XOR_BE(index)] & 0x0f);
if (pen != 0)
{
d[i+1] = palette + pen;
}
index++;
}
iy++;
}
}
else // 8bpp
{
for (j=y1; j < y2; j++)
{
UINT16 *d = BITMAP_ADDR16(bitmap, j, 0);
int index = (iy * width) + ix;
for (i=x1; i < x2; i++)
{
UINT8 pen = v[BYTE4_XOR_BE(index)];
if (pen != 0)
{
d[i] = palette + pen;
}
index++;
}
iy++;
}
}
}