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fmtowns: changes to 15-bit layer/sprite drawing, fixes niko2 (#7190)

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- Sprite color values are masked to their 15 least significant bits
  before they are rendered to VRAM.
- Pixels on the bottom layer (or in single-layer mode) are always drawn,
  even if the transparency bit is set to 1.
This commit is contained in:
r09 2020-09-05 23:51:18 +02:00 committed by GitHub
parent 52b1750a7f
commit e3b086c954
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 4 additions and 5 deletions
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3
hash/fmtowns_cd.xml
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@ -11638,8 +11638,7 @@ User/save disks that can be created from the game itself are not included.
</part>
</software>
<!-- Wrong colors and other graphical glitches -->
<software name="niko2" supported="partial">
<software name="niko2">
<!--
Origin: redump.org
<rom name="Niko^2 (Japan).bin" size="10231200" crc="a0d255b9" sha1="16924ba91862c909730502cadec7eefb94150521"/>

6
src/mame/video/fmtowns.cpp
View file

@ -830,7 +830,7 @@ void towns_state::render_sprite_4(uint32_t poffset, uint32_t coffset, uint16_t x
voffset = 0;
pixel = (m_towns_txtvram[poffset] & 0xf0) >> 4;
col = m_towns_txtvram[coffset+(pixel*2)] | (m_towns_txtvram[coffset+(pixel*2)+1] << 8);
col = (m_towns_txtvram[coffset+(pixel*2)] | (m_towns_txtvram[coffset+(pixel*2)+1] << 8)) & 0x7fff;
if (rotation)
{
voffset += linesize * (xpos & 0x1ff); // scanline size in bytes * y pos
@ -861,7 +861,7 @@ void towns_state::render_sprite_4(uint32_t poffset, uint32_t coffset, uint16_t x
voffset-=2;
pixel = m_towns_txtvram[poffset] & 0x0f;
col = m_towns_txtvram[coffset+(pixel*2)] | (m_towns_txtvram[coffset+(pixel*2)+1] << 8);
col = (m_towns_txtvram[coffset+(pixel*2)] | (m_towns_txtvram[coffset+(pixel*2)+1] << 8)) & 0x7fff;
if(voffset < 0x20000 && xpos < width && ypos < height && pixel != 0 && voffset > linesize)
{
m_towns_gfxvram[0x40000+voffset+vbase+1] = (col & 0xff00) >> 8;
@ -1126,7 +1126,7 @@ void towns_state::towns_crtc_draw_scan_layer_hicolour(bitmap_rgb32 &bitmap,const
curoff = ((off & 0x7fff8) >> 1) | (off & 3);
}
colour = (m_towns_gfxvram[curoff+(offpage*0x40000)+1] << 8) | m_towns_gfxvram[curoff+(offpage*0x40000)];
if(colour < 0x8000)
if(!(m_video.towns_video_reg[0] & 0x10) || (m_video.towns_video_reg[1] & 0x01) != layer || colour < 0x8000)
{
for (pixel = 0; pixel < hzoom; pixel++)
bitmap.pix32(scanline, x+pixel) =