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-rw-r--r--src/mame/audio/polyplay.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/src/mame/audio/polyplay.cpp b/src/mame/audio/polyplay.cpp
new file mode 100644
index 00000000000..3d68c601082
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+++ b/src/mame/audio/polyplay.cpp
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+// license:???
+// copyright-holders:Martin Buchholz
+/***************************************************************************
+
+ Poly-Play
+ (c) 1985 by VEB Polytechnik Karl-Marx-Stadt
+
+ sound hardware
+
+ driver written by Martin Buchholz (buchholz@mail.uni-greifswald.de)
+
+***************************************************************************/
+
+#include "emu.h"
+#include "sound/samples.h"
+#include "includes/polyplay.h"
+
+#define LFO_VOLUME 25
+#define SAMPLE_AMPLITUDE 0x4000
+
+
+
+SAMPLES_START_CB_MEMBER(polyplay_state::sh_start)
+{
+ int i;
+
+ for (i = 0; i < SAMPLE_LENGTH / 2; i++) {
+ m_backgroundwave[i] = + SAMPLE_AMPLITUDE;
+ }
+ for (i = SAMPLE_LENGTH / 2; i < SAMPLE_LENGTH; i++) {
+ m_backgroundwave[i] = - SAMPLE_AMPLITUDE;
+ }
+ m_freq1 = m_freq2 = 110;
+ m_channel_playing1 = 0;
+ m_channel_playing2 = 0;
+}
+
+void polyplay_state::set_channel1(int active)
+{
+ m_channel_playing1 = active;
+}
+
+void polyplay_state::set_channel2(int active)
+{
+ m_channel_playing2 = active;
+}
+
+void polyplay_state::play_channel1(int data)
+{
+ if (data) {
+ m_freq1 = 2457600 / 16 / data / 8;
+ m_samples->set_volume(0, m_channel_playing1 * 1.0);
+ m_samples->start_raw(0, m_backgroundwave, ARRAY_LENGTH(m_backgroundwave), sizeof(m_backgroundwave)*m_freq1,true);
+ }
+ else {
+ m_samples->stop(0);
+ m_samples->stop(1);
+ }
+}
+
+void polyplay_state::play_channel2(int data)
+{
+ if (data) {
+ m_freq2 = 2457600 / 16 / data / 8;
+ m_samples->set_volume(1, m_channel_playing2 * 1.0);
+ m_samples->start_raw(1, m_backgroundwave, ARRAY_LENGTH(m_backgroundwave), sizeof(m_backgroundwave)*m_freq2,true);
+ }
+ else {
+ m_samples->stop(0);
+ m_samples->stop(1);
+ }
+}