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x68k: special priority (nw)

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This commit is contained in:
cracyc 2016-01-05 14:11:17 -06:00
parent 71bb70d968
commit d5400e5f69
2 changed files with 30 additions and 6 deletions
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1
src/mame/includes/x68k.h
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@ -115,6 +115,7 @@ public:
bitmap_ind16 m_pcgbitmap;
bitmap_ind16 m_gfxbitmap;
bitmap_ind16 m_special;
void floppy_load_unload(bool load, floppy_image_device *dev);
int floppy_load(floppy_image_device *dev);

35
src/mame/video/x68k.cpp
View File

@ -26,10 +26,10 @@
1 sprite layer - up to 128 16x16 sprites, 16 colours per sprite, maximum 16 sprites per scanline (not yet implemented).
Questions: What do the other bits in m_video.reg[2] do?
What is "special priority mode"?
How is the intensity applied during blending if at all?
Black appears to be opaque only at priority 2 but not 3, is that right?
Are the gfx layers blended from the bottom up or all at once?
Special priority in 16bit color mode?
*/
@ -783,7 +783,12 @@ bool x68k_state::x68k_draw_gfx_scanline( bitmap_ind16 &bitmap, rectangle cliprec
break;
}
if(colour || (priority == 3))
bitmap.pix16(scanline, pixel) = colour;
{
if(((m_video.reg[2] & 0x1800) == 0x1000) && (colour & 1))
m_special.pix16(scanline, pixel) = colour & ~1;
else
bitmap.pix16(scanline, pixel) = colour;
}
loc++;
loc &= 0x3ff;
}
@ -824,6 +829,8 @@ bool x68k_state::x68k_draw_gfx_scanline( bitmap_ind16 &bitmap, rectangle cliprec
else
bitmap.pix16(scanline, pixel) = (pal[colour] & 0xfffe) + blend;
}
else if(((m_video.reg[2] & 0x1800) == 0x1000) && (colour & 1))
m_special.pix16(scanline, pixel) = colour;
else
bitmap.pix16(scanline, pixel) = colour;
}
@ -860,6 +867,8 @@ bool x68k_state::x68k_draw_gfx_scanline( bitmap_ind16 &bitmap, rectangle cliprec
else
bitmap.pix16(scanline, pixel) = (pal[colour] & 0xfffe) + blend;
}
if(((m_video.reg[2] & 0x1800) == 0x1000) && (colour & 1))
m_special.pix16(scanline, pixel) = colour;
else
bitmap.pix16(scanline, pixel) = colour;
}
@ -901,6 +910,8 @@ void x68k_state::x68k_draw_gfx(bitmap_rgb32 &bitmap,rectangle cliprect)
return;
m_gfxbitmap.fill(0, cliprect);
if((m_video.reg[2] & 0x1800) == 0x1000)
m_special.fill(0, cliprect);
for(priority=3;priority>=0;priority--)
{
@ -1102,10 +1113,8 @@ VIDEO_START_MEMBER(x68k_state,x68000)
m_bg1_16->set_transparent_pen(0);
m_screen->register_screen_bitmap(m_pcgbitmap);
m_pcgbitmap.fill(0);
m_screen->register_screen_bitmap(m_gfxbitmap);
m_gfxbitmap.fill(0);
m_screen->register_screen_bitmap(m_special);
// m_scanline_timer->adjust(attotime::zero, 0, attotime::from_hz(55.45)/568);
}
@ -1118,7 +1127,7 @@ UINT32 x68k_state::screen_update_x68000(screen_device &screen, bitmap_rgb32 &bit
int x;
tilemap_t* x68k_bg0;
tilemap_t* x68k_bg1;
int pixel, scanline;
int pixel = 0, scanline = 0;
//UINT8 *rom;
if((m_spritereg[0x408] & 0x03) == 0x00) // Sprite/BG H-Res 0=8x8, 1=16x16, 2 or 3 = undefined.
@ -1232,6 +1241,20 @@ UINT32 x68k_state::screen_update_x68000(screen_device &screen, bitmap_rgb32 &bit
}
}
if((m_video.reg[2] & 0x1800) == 0x1000) // special priority
{
UINT16 colour;
for(scanline=rect.min_y;scanline<=rect.max_y;scanline++)
{
for(pixel=m_crtc.hbegin;pixel<=m_crtc.hend;pixel++)
{
colour = m_special.pix16(scanline, pixel) & 0xff;
if(colour)
bitmap.pix32(scanline, pixel) = m_gfxpalette->pen(colour & ~1);
}
}
}
#ifdef MAME_DEBUG
if(machine().input().code_pressed(KEYCODE_9))
{