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Update source notes and optimized, nw

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This commit is contained in:
angelosa 2016-02-09 21:06:35 +01:00
parent 18b8f32b2a
commit f7fc08eb36
2 changed files with 31 additions and 12 deletions
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42
src/devices/video/jangou_blitter.cpp
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@ -5,7 +5,7 @@
Jangou Custom Blitter Chip, codename "???" (name scratched afaik)
device emulation by Angelo Salese, from original jangou.cpp implementation
by Angelo Salese, David Haywood and Phil Bennett
by Angelo Salese, David Haywood and Phil Bennett.
TODO:
- BLTFLIP mechanism;
@ -66,6 +66,7 @@ void jangou_blitter_device::device_reset()
{
memset(m_blit_data, 0, ARRAY_LENGTH(m_blit_data));
memset(m_pen_data, 0, ARRAY_LENGTH(m_pen_data));
m_bltflip = false;
}
@ -105,14 +106,23 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_process_w )
int count = 0;
int xcount, ycount;
//printf("%02x %02x %02x %02x %02x %02x %02x\n", m_blit_data[0], m_blit_data[1], m_blit_data[2],m_blit_data[3], m_blit_data[4], m_blit_data[5],m_blit_data[6]);
w = (m_blit_data[4] & 0xff) + 1;
h = (m_blit_data[5] & 0xff) + 1;
src = ((m_blit_data[1] << 8)|(m_blit_data[0] << 0));
src |= (m_blit_data[6] & 3) << 16;
x = (m_blit_data[2] & 0xff);
y = (m_blit_data[3] & 0xff);
#if 0
if(m_bltflip == true)
{
printf("%02x %02x %02x %02x %02x %02x %02x\n", m_blit_data[0], m_blit_data[1], m_blit_data[2],m_blit_data[3], m_blit_data[4], m_blit_data[5],m_blit_data[6]);
printf("=>");
for(int i=0;i<0x10;i++)
printf("%02x ",m_pen_data[i]);
printf("\n");
}
#endif
// lowest bit of src controls flipping / draw direction?
flipx = (m_blit_data[0] & 1);
@ -121,6 +131,7 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_process_w )
else
src -= (w * h) - 1;
for (ycount = 0; ycount < h; ycount++)
{
for(xcount = 0; xcount < w; xcount++)
@ -128,13 +139,10 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_process_w )
int drawx = (x + xcount) & 0xff;
int drawy = (y + ycount) & 0xff;
UINT8 dat = gfx_nibble(src + count);
UINT8 cur_pen_hi = m_pen_data[(dat & 0xf0) >> 4];
UINT8 cur_pen_lo = m_pen_data[(dat & 0x0f) >> 0];
dat = cur_pen_lo | (cur_pen_hi << 4);
if ((dat & 0xff) != 0)
plot_gfx_pixel(dat, drawx, drawy);
UINT8 cur_pen = m_pen_data[(dat & 0x0f) >> 0];
if (cur_pen != 0)
plot_gfx_pixel(cur_pen, drawx, drawy);
if (!flipx)
count--;
@ -142,6 +150,15 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_process_w )
count++;
}
}
UINT32 new_src = src + count;
// update source and height after blitter operation
m_blit_data[0] = new_src & 0xfe;
m_blit_data[1] = new_src >> 8;
m_blit_data[5] = 0;
m_blit_data[6] = new_src >> 16;
m_bltflip = false;
}
}
@ -168,7 +185,8 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_vregs_w)
WRITE8_MEMBER( jangou_blitter_device::blitter_bltflip_w)
{
// TODO: this flips gfx nibbles.
// TODO: unsure about how this works, Charles says it swaps the nibble but afaik it's used for CPU tiles in Night Gal Summer/Sexy Gal and they seems fine?
// Maybe flipx is actually bltflip for later HW?
m_bltflip = true;
}

1
src/devices/video/jangou_blitter.h
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@ -51,6 +51,7 @@ private:
UINT8 m_blit_data[7];
UINT8 *m_gfxrom;
UINT32 m_gfxrommask;
bool m_bltflip;
};