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/*************************************************************************
video/crt.h
CRT video emulation for TX-0 and PDP-1
*************************************************************************/
#ifndef CRT_H_
#define CRT_H_
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_CRT_ADD(_tag, _interface) \
MCFG_DEVICE_ADD(_tag, CRT, 0) \
MCFG_DEVICE_CONFIG(_interface)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
struct crt_interface
{
int num_levels;
int offset_x, offset_y;
int width, height;
};
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() { }
protected:
// device-level overrides
virtual void device_start();
public:
void plot(int x, int y);
void eof();
void update(bitmap_ind16 &bitmap);
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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