1 files changed, 57 insertions, 0 deletions
diff --git a/libopna/opnadrum.h b/libopna/opnadrum.h
new file mode 100644
index 0000000..24bcd48
--- /dev/null
+++ b/libopna/opnadrum.h
@@ -0,0 +1,57 @@
+#ifndef LIBOPNA_OPNADRUM_H_INCLUDED
+#define LIBOPNA_OPNADRUM_H_INCLUDED
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define OPNA_ROM_BD_START  0x0000
+#define OPNA_ROM_SD_START  0x01c0
+#define OPNA_ROM_TOP_START 0x0440
+#define OPNA_ROM_HH_START  0x1b80
+#define OPNA_ROM_TOM_START 0x1d00
+#define OPNA_ROM_RIM_START 0x1f80
+#define OPNA_ROM_SIZE       0x2000
+
+#define OPNA_ROM_BD_SIZE   ((OPNA_ROM_SD_START-OPNA_ROM_BD_START)*2*3)
+#define OPNA_ROM_SD_SIZE   ((OPNA_ROM_TOP_START-OPNA_ROM_SD_START)*2*3)
+#define OPNA_ROM_TOP_SIZE   ((OPNA_ROM_HH_START-OPNA_ROM_TOP_START)*2*3)
+#define OPNA_ROM_HH_SIZE   ((OPNA_ROM_TOM_START-OPNA_ROM_HH_START)*2*3)
+#define OPNA_ROM_TOM_SIZE   ((OPNA_ROM_RIM_START-OPNA_ROM_TOM_START)*2*6)
+#define OPNA_ROM_RIM_SIZE   ((OPNA_ROM_SIZE-OPNA_ROM_RIM_START)*2*6)
+
+struct opna_drum {
+  struct {
+    int16_t *data;
+    bool playing;
+    unsigned index;
+    unsigned len;
+    unsigned level;
+    bool left;
+    bool right;
+  } drums[6];
+  unsigned total_level;
+  int16_t rom_bd[OPNA_ROM_BD_SIZE];
+  int16_t rom_sd[OPNA_ROM_SD_SIZE];
+  int16_t rom_top[OPNA_ROM_TOP_SIZE];
+  int16_t rom_hh[OPNA_ROM_HH_SIZE];
+  int16_t rom_tom[OPNA_ROM_TOM_SIZE];
+  int16_t rom_rim[OPNA_ROM_RIM_SIZE];
+};
+
+void opna_drum_reset(struct opna_drum *drum);
+// set rom data, size: 0x2000 (8192) bytes
+void opna_drum_set_rom(struct opna_drum *drum, void *rom);
+
+void opna_drum_mix(struct opna_drum *drum, int16_t *buf, int samples);
+
+void opna_drum_writereg(struct opna_drum *drum, unsigned reg, unsigned val);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // LIBOPNA_OPNADRUM_H_INCLUDED