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// license:GPL-2.0+
// copyright-holders:Raphael Nabet
/*************************************************************************
video/crt.h
CRT video emulation for TX-0 and PDP-1
*************************************************************************/
#ifndef __CRT_H__
#define __CRT_H__
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_CRT_NUM_LEVELS(_lev) \
crt_device::set_num_levels(*device, _lev);
#define MCFG_CRT_OFFSETS(_xoffs, _yoffs) \
crt_device::set_offsets(*device, _xoffs, _yoffs);
#define MCFG_CRT_SIZE(_width, _height) \
crt_device::set_size(*device, _width, _height);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
struct crt_point
{
crt_point() :
intensity(0),
next(0) {}
int intensity; /* current intensity of the pixel */
/* a node is not in the list when (intensity == -1) */
int next; /* index of next pixel in list */
};
// ======================> crt_device
class crt_device : public device_t
{
public:
crt_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
~crt_device() { }
static void set_num_levels(device_t &device, int levels) { downcast<crt_device &>(device).m_num_intensity_levels = levels; }
static void set_offsets(device_t &device, int x_offset, int y_offset)
{
crt_device &dev = downcast<crt_device &>(device);
dev.m_window_offset_x = x_offset;
dev.m_window_offset_y = y_offset;
}
static void set_size(device_t &device, int width, int height)
{
crt_device &dev = downcast<crt_device &>(device);
dev.m_window_width = width;
dev.m_window_height = height;
}
void plot(int x, int y);
void eof();
void update(bitmap_ind16 &bitmap);
protected:
// device-level overrides
virtual void device_start();
private:
crt_point *m_list; /* array of (crt_window_width*crt_window_height) point */
int *m_list_head; /* head of the list of lit pixels (index in the array) */
/* keep a separate list for each display line (makes the video code slightly faster) */
int m_decay_counter; /* incremented each frame (tells for how many frames the CRT has decayed between two screen refresh) */
/* CRT window */
int m_num_intensity_levels;
int m_window_offset_x;
int m_window_offset_y;
int m_window_width;
int m_window_height;
};
extern const device_type CRT;
#endif /* CRT_H_ */
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