genmidi: Move GENMIDI C code to subdirectory.

Move C code into subdirectory as it will soon be only of historical
interest. Add extra program to dump SBI instrument patches, switch
to using OPL2 instruments, and ignore "null" instruments (all-zero).

lumps/genmidi/Makefile

@@ -1,16 +0,0 @@
-
-CFLAGS = -Wall
-OBJS = genmidi-gen.o oplinstrs.o instrnames.o
-
-genmidi.lmp : genmidi-gen
-	./genmidi-gen $@
-
-genmidi-gen : $(OBJS)
-	$(CC) $(LDFLAGS) $(OBJS) -o $@
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c $^ -o $@
-
-clean:
-	rm -f $(OBJS) genmidi-gen genmidi.lmp
-

lumps/genmidi/orig/Makefile

@@ -0,0 +1,19 @@
+
+CFLAGS = -Wall
+OBJS = oplinstrs.o instrnames.o
+
+genmidi.lmp : genmidi-gen
+	./genmidi-gen $@
+
+genmidi-gen : $(OBJS) genmidi-gen.o
+	$(CC) $(LDFLAGS) $(OBJS) genmidi-gen.o -o $@
+
+dump-sbi : $(OBJS) dump-sbi.o
+	$(CC) $(LDFLAGS) $(OBJS) dump-sbi.o -o $@
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c $^ -o $@
+
+clean:
+	rm -f $(OBJS) genmidi-gen genmidi.lmp
+

lumps/genmidi/orig/README

@@ -1,6 +1,9 @@
 
+This is the "original" code previously used to generate a GENMIDI
+lump, and the original set of patches.
+
 This code generates a functional GENMIDI lump using the free patch data
-from the OpenBSD OPL MIDI driver.  The result doesn't sound quite as
+from the OpenBSD OPL MIDI driver. The result doesn't sound quite as
 good as the original Doom lump; however, most source ports don't use
 GENMIDI anyway nowadays, so this should be good enough.
 

lumps/genmidi/orig/dump-sbi.c

@@ -0,0 +1,94 @@
+//
+// Copyright (c) 2011, Simon Howard
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//  * Redistributions of source code must retain the above copyright notice,
+//    this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of Freedoom project nor the names of its contributors
+//    may be used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "oplvar.h"
+
+#define SBI_HEADER "SBI\x1a"
+
+struct sbi {
+	char header[4];
+	char name[32];
+	char opldata[16];
+};
+
+extern char *genmidi_instr_names[];
+
+static int is_null_instr(struct opl_operators *instrument)
+{
+	int i;
+
+	for (i = 0; i < 10; ++i) {
+		if (instrument->ops[i] != 0x00) {
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+static void write_sbi(char *filename, char *instrname, struct opl_operators *opl)
+{
+	FILE *fs;
+	struct sbi data;
+
+	memset(&data, 0, sizeof(data));
+	memcpy(data.header, SBI_HEADER, 4);
+	strcpy(data.name, instrname);
+	memcpy(data.opldata, opl->ops, 16);
+
+	fs = fopen(filename, "wb");
+	fwrite(&data, 1, sizeof(data), fs);
+	fclose(fs);
+}
+
+int main(int argc, char *argv[])
+{
+	char filename[32];
+	int i;
+
+	for (i = 0; i < 175; ++i) {
+		if (is_null_instr(&opl2_instrs[i])) {
+			continue;
+		}
+
+		if (i < 128) {
+			sprintf(filename, "instr%03i.sbi", i + 1);
+		} else {
+			sprintf(filename, "perc%02i.sbi", i - 128 + 35);
+		}
+
+		write_sbi(filename, genmidi_instr_names[i], &opl2_instrs[i]);
+	}
+
+	return 0;
+}
+

lumps/genmidi/orig/genmidi-gen.c

@@ -83,6 +83,19 @@ static void write_sbi_data(FILE *fstream, unsigned char *data)
         fputc(0, fstream);
 }
 
+static int is_null_instr(struct opl_operators *instrument)
+{
+	int i;
+
+	for (i = 0; i < 10; ++i) {
+		if (instrument->ops[i] != 0x00) {
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
 static void write_instrument(FILE *fstream, 
                              struct opl_operators *instrument,
                              int percussion)
@@ -101,7 +114,12 @@ static void write_instrument(FILE *fstream,
 
         fputc(0x00, fstream);
         fputc(0x80, fstream);           // finetune
-        fputc(0x00, fstream);           // fixed note
+
+	if (is_null_instr(instrument)) { // fixed note
+		fputc(0x00, fstream);
+	} else {
+		fputc(0x10, fstream);
+	}
 
         write_sbi_data(fstream, instrument->ops);
         write_sbi_data(fstream, instrument->ops + 11);
@@ -143,7 +161,7 @@ static void output_genmidi(char *filename)
 
         write_header(fstream);
 
-        write_instrument_data(fstream, opl3_instrs);
+        write_instrument_data(fstream, opl2_instrs);
         write_instrument_names(fstream, genmidi_instr_names);
 
         fclose(fstream);