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// license:BSD-3-Clause
// copyright-holders:Patrick Mackinlay
/*
* Silicon Graphics Multiplexed Multimode Graphics Processor (XMAP2).
*/
#include "emu.h"
#include "sgi_xmap2.h"
#define LOG_GENERAL (1U << 0)
//#define VERBOSE (LOG_GENERAL)
#include "logmacro.h"
DEFINE_DEVICE_TYPE(SGI_XMAP2, sgi_xmap2_device, "sgi_xmap2", "SGI XMAP2")
sgi_xmap2_device::sgi_xmap2_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
: device_t(mconfig, SGI_XMAP2, tag, owner, clock)
, device_palette_interface(mconfig, *this)
, m_options_port(*this, "^options")
, m_map_select(false)
{
}
void sgi_xmap2_device::device_start()
{
// save state
save_item(NAME(m_addr));
save_item(NAME(m_color));
save_item(NAME(m_overlay));
save_item(NAME(m_mode));
save_item(NAME(m_wid_aux));
save_item(NAME(m_map_select));
}
void sgi_xmap2_device::device_reset()
{
m_options = m_options_port->read();
}
u8 sgi_xmap2_device::reg_r(offs_t offset)
{
switch (offset)
{
case 0: // nop
break;
case 1: // blue data
if (m_addr & 0x1000)
return m_color[m_map_select ? m_addr : (m_addr & 0xfff)].b();
else if (m_addr < 0x10)
return m_overlay[m_addr].b();
break;
case 2: // green data
if (m_addr & 0x1000)
return m_color[m_map_select ? m_addr : (m_addr & 0xfff)].g();
else if (m_addr < 0x10)
return m_overlay[m_addr].g();
break;
case 3: // red data
if (m_addr & 0x1000)
return m_color[m_map_select ? m_addr : (m_addr & 0xfff)].r();
else if (m_addr < 0x10)
return m_overlay[m_addr].r();
break;
case 4: // increment address
// TODO: should reading increment the address register?
//m_addr = (m_addr + 1) & 0x1fff;
LOG("read address increment\n");
break;
case 5: // other data
if (m_addr < 0x20)
{
u16 const mode = m_mode[(m_addr >> 1) & 0xf];
return BIT(m_addr, 0) ? (mode >> 8) : u8(mode);
}
else if (m_addr == 0x20)
return m_wid_aux;
else if (m_addr == 0x21)
return m_options;
else
logerror("read unknown address 0x%04x\n", m_addr);
break;
case 6: // address msb
return m_addr >> 8;
case 7: // address lsb
return u8(m_addr);
}
return 0;
}
void sgi_xmap2_device::reg_w(offs_t offset, u8 data)
{
switch (offset)
{
case 0: // nop
break;
case 1: // blue data
if (m_addr & 0x1000)
{
unsigned const index = m_map_select ? m_addr : (m_addr & 0xfff);
m_color[index].set_b(data);
set_pen_blue_level(index & 0xfff, data);
}
else if (m_addr < 0x10)
{
m_overlay[m_addr].set_b(data);
set_pen_blue_level(0x1000 + m_addr, data);
}
break;
case 2: // green data
if (m_addr & 0x1000)
{
unsigned const index = m_map_select ? m_addr : (m_addr & 0xfff);
m_color[index].set_g(data);
set_pen_green_level(index & 0xfff, data);
}
else if (m_addr < 0x10)
{
m_overlay[m_addr].set_g(data);
set_pen_green_level(0x1000 + m_addr, data);
}
break;
case 3: // red data
if (m_addr & 0x1000)
{
unsigned const index = m_map_select ? m_addr : (m_addr & 0xfff);
m_color[index].set_r(data);
set_pen_red_level(index & 0xfff, data);
}
else if (m_addr < 0x10)
{
m_overlay[m_addr].set_r(data);
set_pen_red_level(0x1000 + m_addr, data);
}
break;
case 4: // increment address
m_addr = (m_addr + 1) & 0x1fff;
break;
case 5: // other data
if (m_addr < 0x20)
{
u16 &mode = m_mode[(m_addr >> 1) & 0xf];
if (BIT(m_addr, 0))
mode = (u16(data & 0x3f) << 8) | (mode & 0x00ff);
else
mode = (mode & 0x3f00) | data;
}
else if (m_addr == 0x20)
m_wid_aux = BIT(data, 0);
else
logerror("write unknown address 0x%04x\n", m_addr);
break;
case 6: // address msb
m_addr = u16((data & 0x1f) << 8) | (m_addr & 0x00ff);
break;
case 7: // address lsb
m_addr = (m_addr & 0x1f00) | data;
break;
}
}
void sgi_xmap2_device::map_select_w(int state)
{
if (m_map_select ^ bool(state))
{
m_map_select = bool(state);
// update mame palette
unsigned const base = m_map_select ? 4096 : 0;
for (unsigned i = 0; i < 4096; i++)
set_pen_color(i, m_color[base + i]);
}
}
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