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// license:BSD-3-Clause
// copyright-holders:Patrick Mackinlay
#ifndef MAME_VIDEO_SGI_XMAP2_H
#define MAME_VIDEO_SGI_XMAP2_H
#pragma once
class sgi_xmap2_device
: public device_t
, public device_palette_interface
{
public:
sgi_xmap2_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
// device_t overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_palette_interface overrides
virtual u32 palette_entries() const override { return 4096 + 16; }
u8 reg_r(offs_t offset);
void reg_w(offs_t offset, u8 data);
void map_select_w(int state);
u16 mode_r(unsigned const index) const { return m_mode[index]; }
rgb_t overlay_r(u8 data) const { return m_wid_aux ? m_overlay[data & 0x3] : m_overlay[data & 0xf]; }
enum mode_mask : u16
{
MODE_MC = 0x3c00, // multimap constant
MODE_ME = 0x0200, // multimap enable
MODE_UE = 0x0100, // underlay enable
MODE_OE = 0x00f0, // overlay enable
MODE_BS = 0x0008, // buffer select
MODE_DM = 0x0007, // display mode
};
enum mode_bits : unsigned
{
BIT_ME = 9, // multimap enable
BIT_UE = 8, // underlay enable
BIT_BS = 3, // buffer select
};
private:
required_ioport m_options_port;
u16 m_addr;
rgb_t m_color[8192];
rgb_t m_overlay[16];
u16 m_mode[16];
bool m_wid_aux;
bool m_map_select;
u8 m_options;
};
DECLARE_DEVICE_TYPE(SGI_XMAP2, sgi_xmap2_device)
#endif // MAME_VIDEO_SGI_XMAP2_H
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