samples may have loop points

papers/format.md

@@ -210,7 +210,9 @@ size | description
   2  | volume
   2  | pitch
   1  | depth
-  7  | reserved
+  3  | reserved
+  4  | loop point (>=19)
+     | - -1 means no loop
  2?? | sample data (always 16-bit)
 
 # pattern

src/engine/engine.cpp

@@ -1312,7 +1312,13 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       sample->depth=reader.readC();
 
       // reserved
-      for (int j=0; j<7; j++) reader.readC();
+      for (int j=0; j<3; j++) reader.readC();
+
+      if (ds.version>=18) {
+        sample->loopStart=reader.readI();
+      } else {
+        reader.readI();
+      }
 
       sample->data=new short[sample->length];
       reader.read(sample->data,2*sample->length);
@@ -1777,9 +1783,10 @@ SafeWriter* DivEngine::saveFur() {
     w->writeS(sample->vol);
     w->writeS(sample->pitch);
     w->writeC(sample->depth);
-    for (int j=0; j<7; j++) { // reserved
+    for (int j=0; j<3; j++) { // reserved
       w->writeC(0);
     }
+    w->writeI(sample->loopStart);
 
     w->write(sample->data,sample->length*2);
   }

src/engine/engine.h

@@ -9,8 +9,8 @@
 #include <map>
 #include <queue>
 
-#define DIV_VERSION "0.4pre2"
-#define DIV_ENGINE_VERSION 18
+#define DIV_VERSION "0.4pre3"
+#define DIV_ENGINE_VERSION 19
 
 enum DivStatusView {
   DIV_STATUS_NOTHING=0,

src/engine/sample.h

@@ -2,7 +2,7 @@
 
 struct DivSample {
   String name;
-  int length, rate;
+  int length, rate, loopStart;
   signed char vol, pitch;
   unsigned char depth;
   short* data;
@@ -15,6 +15,7 @@ struct DivSample {
     name(""),
     length(0),
     rate(32000),
+    loopStart(-1),
     vol(0),
     pitch(0),
     depth(16),