*: initial commit of stripped schism stuff

Forking schism tracker's IT playback stuff into a little playback
library for embedding in demos.

1 files changed, 128 insertions, 0 deletions

diff --git a/src/include/it_defs.h b/src/include/it_defs.h
new file mode 100644
index 0000000..0c37ac4
--- /dev/null
+++ b/src/include/it_defs.h
@@ -0,0 +1,128 @@
+#ifndef _ITDEFS_H_
+#define _ITDEFS_H_
+
+#pragma pack(push, 1)
+
+struct it_file {
+	uint32_t id;                    // 0x4D504D49
+	int8_t songname[26];
+	uint8_t hilight_minor;
+	uint8_t hilight_major;
+	uint16_t ordnum;
+	uint16_t insnum;
+	uint16_t smpnum;
+	uint16_t patnum;
+	uint16_t cwtv;
+	uint16_t cmwt;
+	uint16_t flags;
+	uint16_t special;
+	uint8_t globalvol;
+	uint8_t mv;
+	uint8_t speed;
+	uint8_t tempo;
+	uint8_t sep;
+	uint8_t pwd;
+	uint16_t msglength;
+	uint32_t msgoffset;
+	uint32_t reserved2;
+	uint8_t chnpan[64];
+	uint8_t chnvol[64];
+};
+
+
+struct it_envelope {
+	uint8_t flags;
+	uint8_t num;
+	uint8_t lpb;
+	uint8_t lpe;
+	uint8_t slb;
+	uint8_t sle;
+	uint8_t data[25*3];
+	uint8_t reserved;
+};
+
+// Old Impulse Instrument Format (cmwt < 0x200)
+struct it_instrument_old {
+	uint32_t id;                    // IMPI = 0x49504D49
+	int8_t filename[12];    // DOS file name
+	uint8_t zero;
+	uint8_t flags;
+	uint8_t vls;
+	uint8_t vle;
+	uint8_t sls;
+	uint8_t sle;
+	uint16_t reserved1;
+	uint16_t fadeout;
+	uint8_t nna;
+	uint8_t dnc;
+	uint16_t trkvers;
+	uint8_t nos;
+	uint8_t reserved2;
+	int8_t name[26];
+	uint16_t reserved3[3];
+	uint8_t keyboard[240];
+	uint8_t volenv[200];
+	uint8_t nodes[50];
+};
+
+
+// Impulse Instrument Format
+struct it_instrument {
+	uint32_t id;
+	int8_t filename[12];
+	uint8_t zero;
+	uint8_t nna;
+	uint8_t dct;
+	uint8_t dca;
+	uint16_t fadeout;
+	signed char pps;
+	uint8_t ppc;
+	uint8_t gbv;
+	uint8_t dfp;
+	uint8_t rv;
+	uint8_t rp;
+	uint16_t trkvers;
+	uint8_t nos;
+	uint8_t reserved1;
+	int8_t name[26];
+	uint8_t ifc;
+	uint8_t ifr;
+	uint8_t mch;
+	uint8_t mpr;
+	uint16_t mbank;
+	uint8_t keyboard[240];
+	struct it_envelope volenv;
+	struct it_envelope panenv;
+	struct it_envelope pitchenv;
+	uint8_t dummy[4]; // was 7, but IT v2.17 saves 554 bytes
+};
+
+
+// IT Sample Format
+struct it_sample {
+	uint32_t id;            // 0x53504D49
+	int8_t filename[12];
+	uint8_t zero;
+	uint8_t gvl;
+	uint8_t flags;
+	uint8_t vol;
+	int8_t name[26];
+	uint8_t cvt;
+	uint8_t dfp;
+	uint32_t length;
+	uint32_t loopbegin;
+	uint32_t loopend;
+	uint32_t C5Speed;
+	uint32_t susloopbegin;
+	uint32_t susloopend;
+	uint32_t samplepointer;
+	uint8_t vis;
+	uint8_t vid;
+	uint8_t vir;
+	uint8_t vit;
+};
+
+#pragma pack(pop)
+
+
+#endif