//-------------------------------------------------
// find_memshare - find memory share
//-------------------------------------------------
public override ListBytesPointer find_memshare(u8 width, out UInt32 bytes, bool required)
{
bytes = 0;
// look up the share and return NULL if not found
memory_share share = base_().memshare(tag());
if (share == null)
{
return(null);
}
// check the width and warn if not correct
if (width != 0 && share.bitwidth() != width)
{
if (required)
{
osd_printf_warning("Shared ptr '{0}' found but is width {1}, not {2} as requested\n", tag(), share.bitwidth(), width);
}
return(null);
}
// return results
bytes = (UInt32)share.bytes();
return(share.ptr());
}
public void set(memory_share share, int bpe)
{
set(share.ptr(), (UInt32)share.bytes(), share.bitwidth(), share.endianness(), bpe);
}
//void write16_ext(offs_t offset, u16 data, u16 mem_mask = u16(~0));
//u32 read32(offs_t offset);
//void write32(offs_t offset, u32 data, u32 mem_mask = u32(~0));
// helper to update palette when data changed
//void update() { if (!m_init.isnull()) m_init(*this); }
// device-level overrides
//-------------------------------------------------
// device_start - start up the device
//-------------------------------------------------
protected override void device_start()
{
// bind the init function
//m_init.resolve();
// find the memory, if present
memory_share share = memshare(tag());
if (share != null)
{
// find the extended (split) memory, if present
string tag_ext = tag() + "_ext";
memory_share share_ext = memshare(tag_ext);
// make sure we have specified a format
if (m_raw_to_rgb.bytes_per_entry() <= 0)
{
throw new emu_fatalerror("palette_device({0}): Palette has memory share but no format specified", tag());
}
// determine bytes per entry and configure
int bytes_per_entry = m_raw_to_rgb.bytes_per_entry();
if (share_ext == null)
{
m_paletteram.set(share, bytes_per_entry);
}
else
{
m_paletteram.set(share, bytes_per_entry / 2);
m_paletteram_ext.set(share_ext, bytes_per_entry / 2);
}
// override membits if provided
if (m_membits_supplied)
{
// forcing width only makes sense when narrower than the native bus width
if (m_membits >= share.bitwidth())
{
throw new emu_fatalerror("palette_device({0}): Improper use of MCFG_PALETTE_MEMBITS", tag());
}
m_paletteram.set_membits(m_membits);
if (share_ext != null)
{
m_paletteram_ext.set_membits(m_membits);
}
}
// override endianness if provided
if (m_endianness_supplied)
{
// forcing endianness only makes sense when the RAM is narrower than the palette format and not split
if (share_ext != null || (m_paletteram.membits() / 8) >= bytes_per_entry)
{
throw new emu_fatalerror("palette_device({0}): Improper use of MCFG_PALETTE_ENDIANNESS", tag());
}
m_paletteram.set_endianness(m_endianness);
}
}
// call the initialization helper if present
if (m_init != null)
{
m_init(this);
}
}
