- some rework of vectors.h, mostly to remove all those silenced double->float conversions.

src/oplsynth/mlopl_io.cpp

@@ -37,6 +37,7 @@
 *		Cleaned up the source
 */
 
+#include <math.h>
 #ifdef _WIN32
 #include <dos.h>
 #include <conio.h>
@@ -45,7 +46,7 @@
 #include "opl.h"
 #include "c_cvars.h"
 
-#define HALF_PI (PI*0.5)
+const double HALF_PI = (M_PI*0.5);
 
 EXTERN_CVAR(Int, opl_core)
 extern int current_opl_core;