make xm/mod loop working and sort files

engine/src/external/dr_flac.c

@@ -0,0 +1,2 @@
+#define DR_FLAC_IMPLEMENTATION
+#include <dr_flac.h>

engine/src/external/dr_mp3.c

@@ -0,0 +1,2 @@
+#define DR_MP3_IMPLEMENTATION
+#include <dr_mp3.h>

engine/src/external/dr_wav.c

@@ -0,0 +1,2 @@
+#define DR_WAV_IMPLEMENTATION
+#include <dr_wav.h>

engine/src/sound/snd_mod.c

@@ -12,11 +12,13 @@ static void snd_reset(GSSound sound) {
 }
 
 static int snd_read(GSSound sound, GSI16* out, int frame) {
-	if(((jar_mod_context_t*)sound->opaque1)->loopcount > 0) return 0;
+	int f = ((jar_mod_context_t*)sound->opaque1)->last;
+
+	if(f == -1) f = frame;
 
 	jar_mod_fillbuffer(sound->opaque1, out, frame, NULL);
 
-	return frame;
+	return f;
 }
 
 static void snd_close(GSSound sound) {

engine/src/sound/snd_xm.c

@@ -10,11 +10,13 @@ static void snd_reset(GSSound sound) {
 }
 
 static int snd_read(GSSound sound, GSI16* out, int frame) {
-	if(jar_xm_get_loop_count(sound->opaque1) == 1) return 0;
+	int f = jar_xm_get_last(sound->opaque1);
+
+	if(f == -1) f = frame;
 
 	jar_xm_generate_samples_16bit(sound->opaque1, out, frame);
 
-	return frame;
+	return f;
 }
 
 static void snd_close(GSSound sound) {