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-rw-r--r--src/mame/machine/screenless.cpp205
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diff --git a/src/mame/machine/screenless.cpp b/src/mame/machine/screenless.cpp
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/******************************************************************************
+
+Generic screenless base class
+
+This file contains helpers for strobed display elements.
+
+TODO:
+- multiple brightness levels doesn't work for SVGs
+
+******************************************************************************/
+
+#include "emu.h"
+#include "includes/screenless.h"
+
+#include <algorithm>
+
+
+// machine start
+
+ALLOW_SAVE_TYPE(attotime); // m_ds_acc
+
+void screenless_state::machine_start()
+{
+ // resolve handlers
+ m_out_x.resolve();
+ m_out_a.resolve();
+ m_out_digit.resolve();
+
+ // initialize
+ std::fill_n(m_display_state, ARRAY_LENGTH(m_display_state), 0);
+ std::fill_n(m_ds_prev, ARRAY_LENGTH(m_ds_prev), 0);
+ std::fill_n(m_display_segmask, ARRAY_LENGTH(m_display_segmask), 0);
+ std::fill_n(*m_ds_bri, ARRAY_LENGTH(m_ds_bri) * ARRAY_LENGTH(m_ds_bri[0]), 0.0);
+
+ m_display_frame_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(screenless_state::display_frame),this));
+ display_schedule_frame();
+ m_ds_update_time = machine().time();
+
+ // register for savestates
+ save_item(NAME(m_display_maxy));
+ save_item(NAME(m_display_maxx));
+ save_item(NAME(m_display_state));
+ save_item(NAME(m_display_segmask));
+
+ save_item(NAME(m_ds_prev));
+ save_item(NAME(m_ds_bri));
+ save_item(NAME(m_ds_acc));
+ save_item(NAME(m_ds_update_time));
+ save_item(NAME(m_ds_frame_time));
+ save_item(NAME(m_ds_frame_time_set));
+ save_item(NAME(m_ds_frame_factor));
+ save_item(NAME(m_ds_level));
+}
+
+
+// public interface
+
+void screenless_state::set_display_duration(attotime duration)
+{
+ // set frame duration
+ m_ds_frame_time_set = duration;
+}
+
+void screenless_state::set_display_factor(double factor)
+{
+ // set frame interpolation (factor * curframe, 1.0-factor * prev frame)
+ // factor range is 0.0 to 1.0
+ m_ds_frame_factor = factor;
+}
+
+void screenless_state::reset_display_levels()
+{
+ std::fill_n(m_ds_level, ARRAY_LENGTH(m_ds_level), 1.0);
+}
+
+void screenless_state::set_display_level(double level, u8 i)
+{
+ // set a brightness level, range is 0.0 to 1.0
+ m_ds_level[i] = level;
+}
+
+void screenless_state::set_display_levels(u8 levels, ...)
+{
+ // set multiple brightness levels
+ va_list v;
+ va_start(v, levels);
+ for (int i = 0; i < levels; i++)
+ m_ds_level[i] = va_arg(v, double);
+
+ m_ds_level[levels] = 1.0;
+}
+
+void screenless_state::set_display_size(int maxx, int maxy)
+{
+ m_display_maxx = maxx;
+ m_display_maxy = maxy;
+}
+
+void screenless_state::set_display_segmask(u32 digits, u32 mask)
+{
+ // set a segment mask per selected digit, but leave unselected ones alone
+ for (int i = 0; i < 0x20; i++)
+ {
+ if (digits & 1)
+ m_display_segmask[i] = mask;
+ digits >>= 1;
+ }
+}
+
+void screenless_state::display_matrix(int maxx, int maxy, u64 setx, u32 sety, bool update)
+{
+ set_display_size(maxx, maxy);
+
+ // update current state
+ u64 mask = (u64(1) << maxx) - 1;
+ for (int y = 0; y < maxy; y++)
+ m_display_state[y] = (sety >> y & 1) ? ((setx & mask) | (u64(1) << maxx)) : 0;
+
+ if (update)
+ display_update();
+}
+
+void screenless_state::display_update()
+{
+ // call this every time m_display_state is changed (automatic with display_matrix)
+ const attotime now = machine().time();
+ const attotime diff = (m_ds_update_time >= now) ? attotime::zero : now - m_ds_update_time;
+
+ // accumulate active time
+ for (int y = 0; y < m_display_maxy; y++)
+ {
+ u64 row = m_ds_prev[y];
+ m_ds_prev[y] = m_display_state[y];
+
+ if (diff != attotime::zero)
+ {
+ for (int x = 0; x <= m_display_maxx; x++)
+ {
+ if (BIT(row, x))
+ m_ds_acc[y][x] += diff;
+ }
+ }
+ }
+
+ m_ds_update_time = now;
+}
+
+bool screenless_state::display_element_on(u32 x, u32 y)
+{
+ // display element active state
+ return m_ds_bri[y][x] > m_ds_level[0];
+}
+
+
+// internal handlers
+
+void screenless_state::display_schedule_frame()
+{
+ std::fill_n(*m_ds_acc, ARRAY_LENGTH(m_ds_acc) * ARRAY_LENGTH(m_ds_acc[0]), attotime::zero);
+
+ m_ds_frame_time = m_ds_frame_time_set;
+ m_display_frame_timer->adjust(m_ds_frame_time);
+}
+
+TIMER_CALLBACK_MEMBER(screenless_state::display_frame)
+{
+ display_update();
+
+ const double frame_time = m_ds_frame_time.as_double();
+ const double factor0 = m_ds_frame_factor;
+ const double factor1 = 1.0 - factor0;
+
+ for (int y = 0; y < m_display_maxy; y++)
+ {
+ u64 row = 0;
+
+ for (int x = 0; x <= m_display_maxx; x++)
+ {
+ // determine brightness level
+ double bri = m_ds_bri[y][x] * factor1 + (m_ds_acc[y][x].as_double() / frame_time) * factor0;
+ if (bri > 1.0) bri = 1.0; // shouldn't happen
+ m_ds_bri[y][x] = bri;
+
+ u8 level;
+ for (level = 0; bri > m_ds_level[level]; level++) { ; }
+
+ if (level > 0)
+ row |= (u64(1) << x);
+
+ // output to y.x, or y.a when always-on
+ if (x != m_display_maxx)
+ m_out_x[y][x] = level;
+ else
+ m_out_a[y] = level;
+ }
+
+ // output to digity
+ if (m_display_segmask[y] != 0)
+ m_out_digit[y] = row & m_display_segmask[y];
+ }
+
+ display_schedule_frame();
+}