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Implement sub-pixel horizontal resolution. (nw)

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This is not yet used and missing static initialization interface.
Electron beams in CRTs are not discrete. They are continous on a
scanline. This modification allows a higher horizontal resolution to
better model "subpixel" timing.
This commit is contained in:
couriersud 2019-01-04 19:19:25 +01:00
parent ee115932f8
commit 880786341d
2 changed files with 15 additions and 9 deletions
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23
src/devices/video/fixfreq.cpp
View File

@ -19,7 +19,6 @@
//#define VERBOSE 1
#include "logmacro.h"
/***************************************************************************
Fixed frequency monitor
@ -31,7 +30,13 @@ DEFINE_DEVICE_TYPE(FIXFREQ, fixedfreq_device, "fixfreq", "Fixed-Frequency Monoch
fixedfreq_device::fixedfreq_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock),
device_video_interface(mconfig, *this, false),
m_htotal(0), m_vtotal(0), m_sync_signal(0), m_last_x(0), m_last_y(0), m_cur_bm(0),
m_htotal(0),
m_vtotal(0),
m_hscale(1), // FIXME: this should be modified by static initialization
m_sync_signal(0),
m_last_x(0),
m_last_y(0),
m_cur_bm(0),
// default to NTSC "704x480@30i"
m_monitor_clock(13500000),
m_hvisible(704),
@ -146,8 +151,8 @@ void fixedfreq_device::recompute_parameters()
m_vsync_filter_timeconst = (double) (m_monitor_clock) / (double) m_htotal * 1.0; // / (3.0 + 3.0);
LOG("trigger %f with len %f\n", m_vsync_threshold, 1e6 / m_vsync_filter_timeconst);
m_bitmap[0] = std::make_unique<bitmap_rgb32>(m_htotal, m_vtotal);
m_bitmap[1] = std::make_unique<bitmap_rgb32>(m_htotal, m_vtotal);
m_bitmap[0] = std::make_unique<bitmap_rgb32>(m_htotal * m_hscale, m_vtotal);
m_bitmap[1] = std::make_unique<bitmap_rgb32>(m_htotal * m_hscale, m_vtotal);
m_clock_period = 1.0 / m_monitor_clock;
update_screen_parameters(m_clock_period * m_vtotal * m_htotal);
@ -156,13 +161,13 @@ void fixedfreq_device::recompute_parameters()
void fixedfreq_device::update_screen_parameters(const time_type &refresh)
{
rectangle visarea(
m_hbackporch - m_hfrontporch,
m_hbackporch - m_hfrontporch + m_hvisible - 1,
(m_hbackporch - m_hfrontporch) * m_hscale,
(m_hbackporch - m_hfrontporch + m_hvisible) * m_hscale - 1,
m_vbackporch - m_vfrontporch,
m_vbackporch - m_vfrontporch + m_vvisible - 1);
m_refresh_period = refresh;
screen().configure(m_htotal, m_vtotal, visarea, DOUBLE_TO_ATTOSECONDS(m_refresh_period));
screen().configure(m_htotal * m_hscale, m_vtotal, visarea, DOUBLE_TO_ATTOSECONDS(m_refresh_period));
}
void fixedfreq_device::update_sync_channel(const time_type &time, const double newval)
@ -198,7 +203,7 @@ void fixedfreq_device::update_sync_channel(const time_type &time, const double n
/* TODO - time since last hsync and field detection */
LOG("HSYNC up %d\n", m_last_x);
// FIXME: pixels > 50 filters some spurious hysnc on line 27 in breakout
if (!m_sig_vsync && (m_last_x > 100))
if (!m_sig_vsync && (m_last_x > m_hscale * 100))
{
m_last_y += m_fieldcount;
m_last_x = 0;
@ -218,7 +223,7 @@ void fixedfreq_device::update_sync_channel(const time_type &time, const double n
void fixedfreq_device::update_bm(const time_type &time)
{
const int pixels = round((time - m_line_time) / m_clock_period);
const int pixels = round((time - m_line_time) * m_hscale / m_clock_period);
const int has_fields = (m_fieldcount > 1) ? 1: 0;
bitmap_rgb32 *bm = m_bitmap[m_cur_bm].get();

1
src/devices/video/fixfreq.h
View File

@ -124,6 +124,7 @@ private:
int m_htotal;
int m_vtotal;
int m_hscale;
double m_sync_signal;
rgb_t m_col;