Add intrinsics.

handmade_intrinsics.h

@@ -0,0 +1,39 @@
+#ifndef HANDMADE_INTRINSICS_H_SENTRY
+#define HANDMADE_INTRINSICS_H_SENTRY
+
+/* TODO: Re-implement these functions so we do not have to rely on
+         math.h. */
+
+#include <math.h>
+
+S32 RoundF32toS32(F32 Real32)
+{
+    S32 Result = (S32)(Real32 + 0.5f);
+    return Result;
+}
+
+S32 FloorF32toS32(F32 Real32)
+{
+    S32 Result = (S32)floorf(Real32);
+    return Result;
+}
+
+F32 Sin(F32 Angle)
+{
+    F32 Result = sinf(Angle);
+    return Result;
+}
+
+F32 Cos(F32 Angle)
+{
+    F32 Result = cosf(Angle);
+    return Result;
+}
+
+F32 ATan2(F32 Y, F32 X)
+{
+    F32 Result = atan2f(Y, X);
+    return Result;
+}
+
+#endif