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getaway: small fix with dmask

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hap 2021-01-19 23:55:56 +01:00
parent e128cf1861
commit 167137fde2
1 changed files with 6 additions and 4 deletions
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10
src/mame/drivers/getaway.cpp
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@ -127,18 +127,20 @@ void getaway_state::io_w(offs_t offset, u8 data)
if (n == 1 && ~m_regs[n] & data & 0x80)
{
// start gfx rom->vram transfer?
u16 src = (m_regs[6] << 8 | m_regs[5]) & 0x1fff;
u8 bytes = m_regs[8];
u16 src = m_regs[6] << 8 | m_regs[5];
//u8 smask = src >> 13;
src &= 0x1fff;
u16 dest = m_regs[4] << 8 | m_regs[3];
u8 dmask = dest >> 13;
dest &= 0x1fff;
u8 bytes = m_regs[8];
for (int count = 0; count < bytes; count++)
{
for (int i = 0; i < 3; i++)
if (BIT(dmask, i))
m_vram[i * 0x2000 + dest] = m_gfxrom[src];
m_vram[i * 0x2000 + dest] = BIT(dmask, i) ? m_gfxrom[src] : 0;
src = (src + 1) & 0x1fff;
dest = (dest + 1) & 0x1fff;