Added lib/cmixer and new audio system

src/main.c

@@ -12,6 +12,7 @@
 #include <dos.h>
 
 #include "lib/dmt/dmt.h"
+#include "lib/cmixer/cmixer.h"
 #include "vga.h"
 #include "luaobj.h"
 #include "keyboard.h"
@@ -46,6 +47,22 @@ static int onLuaPanic(lua_State *L) {
 }
 
 
+static short audioBuffer[SOUNDBLASTER_SAMPLES_PER_BUFFER * 2];
+
+static const short* audioCallback(void) {
+  /* For the moment the soundblaster code expects mono audio while the cmixer
+  ** library outputs stereo -- we process to a stereo buffer, then copy the left
+  ** channel to the start of the buffer */
+  int i;
+  int len = SOUNDBLASTER_SAMPLES_PER_BUFFER;
+  cm_process(audioBuffer, len * 2);
+  for (i = 0; i < len; i++) {
+    audioBuffer[i] = audioBuffer[i * 2];
+  }
+  return audioBuffer;
+}
+
+
 int luaopen_love(lua_State *L);
 
 int main(int argc, char **argv) {
@@ -57,7 +74,8 @@ int main(int argc, char **argv) {
 
   /* Init everything */
   atexit(deinit);
-  // soundblaster_init(mixer_getNextBlock);
+  cm_init(soundblaster_getSampleRate());
+  soundblaster_init(audioCallback);
   vga_init();
   palette_init();
   keyboard_init();