mirror of
https://github.com/holub/mame
synced 2025-06-01 18:41:47 +03:00
0a7bff1417
* It's generally not a great idea to do integer ops on bool - it implicitly casts to/from int and may perform poorly * Get rid of required ram_device in atari 8-bit common state - it isn't required/used by bartop52 * Get rid of bogus RAM device in bartop52 * Restore some authors' stylistic choices * Make some stuff more consistent
107 lines
2.2 KiB
C++
107 lines
2.2 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Sven Schnelle
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#include "emu.h"
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#include "nereid.h"
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//#define VERBOSE 1
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#include "logmacro.h"
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DEFINE_DEVICE_TYPE(NEREID, nereid_device, "nereid", "HP Nereid ASIC")
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nereid_device::nereid_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, type, tag, owner, clock),
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m_red(0),
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m_green(0),
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m_blue(0),
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m_index(0),
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m_plane_mask(0)
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{
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}
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nereid_device::nereid_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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nereid_device(mconfig, NEREID, tag, owner, clock)
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{
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}
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void nereid_device::device_start()
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{
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save_item(NAME(m_red));
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save_item(NAME(m_green));
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save_item(NAME(m_blue));
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save_item(NAME(m_index));
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save_item(NAME(m_palette));
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save_item(NAME(m_plane_mask));
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}
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void nereid_device::device_reset()
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{
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memset(&m_palette, 0, sizeof(m_palette));
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}
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READ16_MEMBER(nereid_device::ctrl_r)
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{
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LOG("NEREID ctrl_r: %02X\n", offset);
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switch(offset & 0x7f) {
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case NEREID_BUSY:
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return 0;
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case NEREID_RED_DATA:
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return 0xff00 | m_red;
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case NEREID_GREEN_DATA:
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return 0xff00 | m_green;
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case NEREID_BLUE_DATA:
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return 0xff00 | m_blue;
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case NEREID_INDEX:
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return 0xff00 | m_index;
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case NEREID_WRITE_STROBE:
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return 0xff00;
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case NEREID_PLANE_MASK:
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return 0xff00 | m_plane_mask;
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default:
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return space.unmap();
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}
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return 0xffff;
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}
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WRITE16_MEMBER(nereid_device::ctrl_w)
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{
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LOG("NEREID: ctrl_w %02X = %02X\n", offset, data);
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data &= 0xff;
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switch(offset & 0x7f) {
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case NEREID_RED_DATA:
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m_red = data;
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break;
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case NEREID_GREEN_DATA:
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m_green = data;
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break;
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case NEREID_BLUE_DATA:
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m_blue = data;
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break;
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case NEREID_INDEX:
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m_index = ~data;
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break;
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case NEREID_WRITE_STROBE:
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LOG("NEREID: set color index %u: rgb_t(%u,%u,%u)\n",
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m_index, m_red, m_green, m_blue);
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m_palette[m_index] = rgb_t(m_red, m_green, m_blue);
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break;
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case NEREID_READ_STROBE:
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m_red = m_palette[m_index].r();
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m_green = m_palette[m_index].g();
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m_blue = m_palette[m_index].b();
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break;
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case NEREID_PLANE_MASK:
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m_plane_mask = data;
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break;
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default:
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LOG("nereid::ctrl_w: %X = %04X (mask %04X)\n", offset, data, mem_mask);
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break;
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}
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}
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rgb_t nereid_device::map_color(uint8_t input)
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{
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return m_palette[input & m_plane_mask];
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}
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