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x68k: fix offset and try to improve blending

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This commit is contained in:
cracyc 2024-09-16 19:58:18 -05:00
parent 69c8c7a4c2
commit 6a4b1b300c
1 changed files with 3 additions and 3 deletions
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6
src/mame/sharp/x68k_v.cpp
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@ -138,7 +138,7 @@ void x68k_state::spritereg_w(offs_t offset, uint16_t data, uint16_t mem_mask)
m_video.bg_hstart = (data - 4) * 8 + 1; m_video.bg_hstart = (data - 4) * 8 + 1;
break; break;
case 0x407: // BG V-DISP (like CRTC reg 6) case 0x407: // BG V-DISP (like CRTC reg 6)
m_video.bg_vstart = data - 1; m_video.bg_vstart = data;
break; break;
case 0x408: // BG H/V-Res case 0x408: // BG H/V-Res
m_video.bg_hvres = data & 0x1f; m_video.bg_hvres = data & 0x1f;
@ -443,7 +443,7 @@ template <bool Blend> rgb_t x68k_state::get_gfx_pixel(int scanline, int pixel, b
if(colour || (m_video.gfx_pri == 2)) if(colour || (m_video.gfx_pri == 2))
{ {
if(blend) if(blend)
return ((blendpix >> 1) & 0xff7f7f7f) + ((pal555(colour, 6, 11, 1) >> 1) & 0x7f7f7f); return ((blendpix >> 1) & 0xff7f7f7f) + ((pal555(colour, 6, 11, 1) >> 2) & 0x3f3f3f);
else else
return pal555(colour, 6, 11, 1); return pal555(colour, 6, 11, 1);
} }
@ -461,7 +461,7 @@ template <bool Blend> rgb_t x68k_state::get_gfx_pixel(int scanline, int pixel, b
if((m_gfxpalette->pen(colour) & 0xffffff) || (m_video.gfx_pri == 2)) if((m_gfxpalette->pen(colour) & 0xffffff) || (m_video.gfx_pri == 2))
{ {
if(blend) if(blend)
return ((blendpix >> 1) & 0xff7f7f7f) + ((m_gfxpalette->pen(colour) >> 1) & 0x7f7f7f); return ((blendpix >> 1) & 0xff7f7f7f) + ((m_gfxpalette->pen(colour) >> 2) & 0x3f3f3f);
else else
return m_gfxpalette->pen(colour); return m_gfxpalette->pen(colour);
} }