// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Intelligent Designs NICK emulation
**********************************************************************/
#ifndef MAME_VIDEO_NICK_H
#define MAME_VIDEO_NICK_H
#pragma once
#include "machine/rescap.h"
#include "video/resnet.h"
#include "screen.h"
///*************************************************************************
// INTERFACE CONFIGURATION MACROS
///*************************************************************************
/* there are 64us per line, although in reality
about 50 are visible. */
#define ENTERPRISE_SCREEN_WIDTH (50*16)
/* there are 312 lines per screen, although in reality
about 35*8 are visible */
#define ENTERPRISE_SCREEN_HEIGHT (35*8)
///*************************************************************************
// TYPE DEFINITIONS
///*************************************************************************
/* Nick executes a Display list, in the form of a list of Line Parameter
Tables, this is the form of the data */
struct LPT_ENTRY
{
uint8_t SC; /* scanlines in this modeline (two's complement) */
uint8_t MB; /* the MODEBYTE (defines video display mode) */
uint8_t LM; /* left margin etc */
uint8_t RM; /* right margin etc */
uint8_t LD1L; /* (a7..a0) of line data pointer LD1 */
uint8_t LD1H; /* (a8..a15) of line data pointer LD1 */
uint8_t LD2L; /* (a7..a0) of line data pointer LD2 */
uint8_t LD2H; /* (a8..a15) of line data pointer LD2 */
uint8_t COL[8]; /* COL0..COL7 */
};
// ======================> nick_device
class nick_device : public device_t,
public device_memory_interface,
public device_video_interface
{
public:
// construction/destruction
template <typename T>
nick_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, T &&screen_tag) :
nick_device(mconfig, tag, owner, clock)
{
set_screen(std::forward<T>(screen_tag));
}
nick_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
auto virq_wr_callback() { return m_write_virq.bind(); }
virtual void vram_map(address_map &map);
virtual void vio_map(address_map &map);
uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void nick_map(address_map &map);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
// device_memory_interface overrides
virtual space_config_vector memory_space_config() const override;
DECLARE_READ8_MEMBER( vram_r );
DECLARE_WRITE8_MEMBER( vram_w );
DECLARE_WRITE8_MEMBER( fixbias_w );
DECLARE_WRITE8_MEMBER( border_w );
DECLARE_WRITE8_MEMBER( lpl_w );
DECLARE_WRITE8_MEMBER( lph_w );
address_space_config m_space_config;
private:
devcb_write_line m_write_virq;
void initialize_palette();
void write_pixel(int ci);
void calc_visible_clocks(int width);
void write_border(int clocks);
void do_left_margin();
void do_right_margin();
int get_color_index(int pen_index);
void write_pixels2color(uint8_t pen0, uint8_t pen1, uint8_t data_byte);
void write_pixels2color_lpixel(uint8_t pen0, uint8_t pen1, uint8_t data_byte);
void write_pixels(uint8_t data_byte, uint8_t char_idx);
void write_pixels_lpixel(uint8_t data_byte, uint8_t char_idx);
void do_pixel(int clocks_visible);
void do_lpixel(int clocks_visible);
void do_attr(int clocks_visible);
void do_ch256(int clocks_visible);
void do_ch128(int clocks_visible);
void do_ch64(int clocks_visible);
void do_display();
void update_lpt();
void reload_lpt();
void do_line();
/* current scanline within LPT */
uint8_t m_scanline_count;
uint8_t m_FIXBIAS;
uint8_t m_BORDER;
uint8_t m_LPL;
uint8_t m_LPH;
uint16_t m_LD1;
uint16_t m_LD2;
LPT_ENTRY m_LPT;
uint32_t *m_dest;
int m_dest_pos;
int m_dest_max_pos;
uint8_t m_reg[4];
/* first clock visible on left hand side */
int m_first_visible_clock;
/* first clock visible on right hand side */
int m_last_visible_clock;
/* given a bit pattern, this will get the pen index */
uint8_t m_pen_idx_4col[256];
/* given a bit pattern, this will get the pen index */
uint8_t m_pen_idx_16col[256];
int m_virq;
bitmap_rgb32 m_bitmap;
rgb_t m_palette[256];
emu_timer *m_timer_scanline;
};
// device type definition
DECLARE_DEVICE_TYPE(NICK, nick_device)
#endif // MAME_VIDEO_NICK_H