initial import

git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@2 be3aeb3a-fb24-0410-a615-afba39da0efa

linux/940ctl_ym2612.c

@@ -0,0 +1,112 @@
+/* faked 940 code just uses local copy of ym2612 */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "../../Pico/sound/ym2612.h"
+#include "../gp2x/gp2x.h"
+#include "../gp2x/emu.h"
+#include "../gp2x/menu.h"
+
+
+static YM2612 ym2612;
+
+YM2612 *ym2612_940 = &ym2612;
+int  mix_buffer_[44100/50*2];	/* this is where the YM2612 samples will be mixed to */
+int *mix_buffer = mix_buffer_;
+
+
+/***********************************************************/
+
+#define MAXOUT		(+32767)
+#define MINOUT		(-32768)
+
+/* limitter */
+#define Limit(val, max,min) { \
+	if ( val > max )      val = max; \
+	else if ( val < min ) val = min; \
+}
+
+
+int YM2612Write_940(unsigned int a, unsigned int v)
+{
+	YM2612Write_(a, v);
+
+	return 0; // cause the engine to do updates once per frame only
+}
+
+UINT8 YM2612Read_940(void)
+{
+	return YM2612Read_();
+}
+
+
+int YM2612PicoTick_940(int n)
+{
+	YM2612PicoTick_(n);
+
+	return 0;
+}
+
+
+void YM2612PicoStateLoad_940(void)
+{
+	int i;
+
+	YM2612PicoStateLoad_();
+
+	for(i = 0; i < 0x100; i++) {
+		YM2612Write_(0, i);
+		YM2612Write_(1, ym2612.REGS[i]);
+	}
+	for(i = 0; i < 0x100; i++) {
+		YM2612Write_(2, i);
+		YM2612Write_(3, ym2612.REGS[i|0x100]);
+	}
+}
+
+
+void YM2612Init_940(int baseclock, int rate)
+{
+	YM2612Init_(baseclock, rate);
+}
+
+
+void YM2612ResetChip_940(void)
+{
+	YM2612ResetChip_();
+}
+
+
+void YM2612UpdateOne_940(short *buffer, int length, int stereo)
+{
+	int i;
+
+	YM2612UpdateOne_(buffer, length, stereo);
+
+	/* mix data */
+	if (stereo) {
+		int *mb = mix_buffer;
+		for (i = length; i > 0; i--) {
+			int l, r;
+			l = r = *buffer;
+			l += *mb++, r += *mb++;
+			Limit( l, MAXOUT, MINOUT );
+			Limit( r, MAXOUT, MINOUT );
+			*buffer++ = l; *buffer++ = r;
+		}
+	} else {
+		for (i = 0; i < length; i++) {
+			int l = mix_buffer[i];
+			l += buffer[i];
+			Limit( l, MAXOUT, MINOUT );
+			buffer[i] = l;
+		}
+	}
+}
+