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-rw-r--r--trunk/src/mame/audio/polyplay.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/trunk/src/mame/audio/polyplay.c b/trunk/src/mame/audio/polyplay.c
new file mode 100644
index 00000000000..a84dd7c2a70
--- /dev/null
+++ b/trunk/src/mame/audio/polyplay.c
@@ -0,0 +1,77 @@
+/***************************************************************************
+
+ 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( polyplay_sh_start )
+{
+ polyplay_state *state = device.machine().driver_data<polyplay_state>();
+ int i;
+
+ for (i = 0; i < SAMPLE_LENGTH / 2; i++) {
+ state->m_backgroundwave[i] = + SAMPLE_AMPLITUDE;
+ }
+ for (i = SAMPLE_LENGTH / 2; i < SAMPLE_LENGTH; i++) {
+ state->m_backgroundwave[i] = - SAMPLE_AMPLITUDE;
+ }
+ state->m_freq1 = state->m_freq2 = 110;
+ state->m_channel_playing1 = 0;
+ state->m_channel_playing2 = 0;
+}
+
+void polyplay_set_channel1(running_machine &machine, int active)
+{
+ polyplay_state *state = machine.driver_data<polyplay_state>();
+ state->m_channel_playing1 = active;
+}
+
+void polyplay_set_channel2(running_machine &machine, int active)
+{
+ polyplay_state *state = machine.driver_data<polyplay_state>();
+ state->m_channel_playing2 = active;
+}
+
+void polyplay_play_channel1(running_machine &machine, int data)
+{
+ polyplay_state *state = machine.driver_data<polyplay_state>();
+ samples_device *samples = machine.device<samples_device>("samples");
+ if (data) {
+ state->m_freq1 = 2457600 / 16 / data / 8;
+ samples->set_volume(0, state->m_channel_playing1 * 1.0);
+ samples->start_raw(0, state->m_backgroundwave, ARRAY_LENGTH(state->m_backgroundwave), sizeof(state->m_backgroundwave)*state->m_freq1,true);
+ }
+ else {
+ samples->stop(0);
+ samples->stop(1);
+ }
+}
+
+void polyplay_play_channel2(running_machine &machine, int data)
+{
+ polyplay_state *state = machine.driver_data<polyplay_state>();
+ samples_device *samples = machine.device<samples_device>("samples");
+ if (data) {
+ state->m_freq2 = 2457600 / 16 / data / 8;
+ samples->set_volume(1, state->m_channel_playing2 * 1.0);
+ samples->start_raw(1, state->m_backgroundwave, ARRAY_LENGTH(state->m_backgroundwave), sizeof(state->m_backgroundwave)*state->m_freq2,true);
+ }
+ else {
+ samples->stop(0);
+ samples->stop(1);
+ }
+}