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Made a shadow ROM copy, the charset is now more faithful to the original reference

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This commit is contained in:
Angelo Salese 2012-08-28 13:03:15 +00:00
parent b277abcbed
commit 267f60c0b6
2 changed files with 77 additions and 11 deletions
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86
src/emu/video/m50458.c
View File

@ -9,6 +9,8 @@
"worse" ways, the one currently implemented guesses that the screen is
masked at the top and the end when in scrolling mode).
- Understand what the "vertical start position" really does (vblank?)
- Check if the ROM source is actually 2bpp once that a redump is made
(the shadow ROM copy doesn't convince me 100%);
***************************************************************************/
@ -79,9 +81,7 @@ WRITE16_MEMBER( m50458_device::vreg_127_w)
int i;
for(i=0;i<0x120;i++)
{
write_word(i,0);
}
write_word(i,0x007f);
}
}
@ -160,7 +160,47 @@ void m50458_device::device_validity_check(validity_checker &valid) const
void m50458_device::device_start()
{
UINT16 tmp;
UINT8 *pcg = memregion("m50458")->base();
int tile;
int yi;
UINT16 src,dst;
/* Create an array for shadow gfx */
/* this will spread the source ROM into four directions (up-left, up-right, down-left, down-right) thus creating a working shadow copy */
m_shadow_gfx = auto_alloc_array_clear(machine(), UINT8, 0x1200);
for(tile=0;tile<0x80;tile++)
{
for(yi=1;yi<17;yi++)
{
src = (tile & 0x7f)*36+yi*2; /* source offset */
dst = (tile & 0x7f)*36+(yi-1)*2; /* destination offset */
tmp = (((pcg[src]<<8)|(pcg[src+1]&0xff)) & 0xfffe) >> 1;
m_shadow_gfx[dst+1] |= tmp & 0xff;
m_shadow_gfx[dst] |= (tmp >> 8);
tmp = (((pcg[src]<<8)|(pcg[src+1]&0xff)) & 0x7fff) << 1;
m_shadow_gfx[dst+1] |= tmp & 0xff;
m_shadow_gfx[dst] |= (tmp >> 8);
dst = (tile & 0x7f)*36+(yi+1)*2; /* destination offset */
tmp = (((pcg[src]<<8)|(pcg[src+1]&0xff)) & 0xfffe) >> 1;
m_shadow_gfx[dst+1] |= tmp & 0xff;
m_shadow_gfx[dst] |= (tmp >> 8);
tmp = (((pcg[src]<<8)|(pcg[src+1]&0xff)) & 0x7fff) << 1;
m_shadow_gfx[dst+1] |= tmp & 0xff;
m_shadow_gfx[dst] |= (tmp >> 8);
}
}
}
@ -170,6 +210,11 @@ void m50458_device::device_start()
void m50458_device::device_reset()
{
int i;
/* clear VRAM at boot */
for(i=0;i<0x120;i++)
write_word(i,0x007f);
}
@ -267,24 +312,25 @@ UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
for(xi=4;xi<16;xi++) /* TODO: remove 4 / 16 / -4 offset once that the ROM is fixed */
{
UINT8 pix;
UINT8 r,g,b;
UINT8 color = (tile & 0x700) >> 8;
UINT16 offset = ((tile & 0x7f)*36+yi*2);
int res_y;
/* TODO: blinking, bit 7 (RTC test in NSS) */
if(xi>=8)
pix = (pcg[offset+1] >> (7-(xi & 0x7))) & 1;
pix = ((pcg[offset+1] >> (7-(xi & 0x7))) & 1) << 1;
else
pix = (pcg[offset+0] >> (7-(xi & 0x7))) & 1;
pix = ((pcg[offset+0] >> (7-(xi & 0x7))) & 1) << 1;
if(xi>=8)
pix |= ((m_shadow_gfx[offset+1] >> (7-(xi & 0x7))) & 1);
else
pix |= ((m_shadow_gfx[offset+0] >> (7-(xi & 0x7))) & 1);
if(yi == 17 && tile & 0x1000) /* underline? */
pix |= 1;
r = (tile & 0x100 && pix) ? 0xff : 0x00;
g = (tile & 0x200 && pix) ? 0xff : 0x00;
b = (tile & 0x400 && pix) ? 0xff : 0x00;
res_y = y*18+yi;
if(y != 0 && y != 11)
@ -294,8 +340,26 @@ UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
res_y += 216;
}
if(r || g || b)
if(pix != 0)
{
UINT8 r,g,b;
if(pix & 2)
{
r = (color & 0x1) ? 0xff : 0x00;
g = (color & 0x2) ? 0xff : 0x00;
b = (color & 0x4) ? 0xff : 0x00;
}
else //if(pix & 1)
{
/* TODO: shadow parameter */
r = 0x00;
g = 0x00;
b = 0x00;
}
bitmap.pix32(res_y,x*12+(xi-4)) = r << 16 | g << 8 | b;
}
}
}
}

2
src/emu/video/m50458.h
View File

@ -64,6 +64,8 @@ protected:
UINT16 m_current_cmd;
int m_cmd_stream_pos;
UINT16 m_osd_addr;
UINT8 *m_shadow_gfx;
UINT8 m_bg_pen;
UINT8 m_phase;
UINT8 m_scrf,m_scrr;