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getaway: show garbage on screen

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This commit is contained in:
hap 2021-01-19 23:37:49 +01:00
parent b0422d0a24
commit e128cf1861
1 changed files with 29 additions and 0 deletions
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29
src/mame/drivers/getaway.cpp
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@ -89,6 +89,19 @@ void getaway_state::machine_start()
uint32_t getaway_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for (int x = 0; x < 32; x++)
{
u8 r = m_vram[0x0000 | (x << 8 | y)];
u8 g = m_vram[0x2000 | (x << 8 | y)];
u8 b = m_vram[0x4000 | (x << 8 | y)];
for (int i = 0; i < 8; i++)
bitmap.pix(y, x << 3 | (i ^ 7)) = BIT(b, i) << 2 | BIT(g, i) << 1 | BIT(r, i);
}
}
return 0;
}
@ -114,6 +127,22 @@ 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 dest = m_regs[4] << 8 | m_regs[3];
u8 dmask = dest >> 13;
dest &= 0x1fff;
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];
src = (src + 1) & 0x1fff;
dest = (dest + 1) & 0x1fff;
}
}
m_regs[n] = data;