Use smaller types for enums

alc/alcmain.h

@@ -53,14 +53,14 @@ using uint = unsigned int;
 #define DEFAULT_NUM_UPDATES  3
 
 
-enum class DeviceType {
+enum class DeviceType : unsigned char {
     Playback,
     Capture,
     Loopback
 };
 
 
-enum class RenderMode {
+enum class RenderMode : unsigned char {
     Normal,
     Pairwise,
     Hrtf

alc/alcontext.h

@@ -33,7 +33,7 @@ struct RingBuffer;
 struct VoiceChange;
 
 
-enum class DistanceModel {
+enum class DistanceModel : unsigned char {
     Disable,
     Inverse, InverseClamped,
     Linear, LinearClamped,

alc/voice.h

@@ -19,7 +19,7 @@
 
 struct ALCcontext;
 struct EffectSlot;
-enum class DistanceModel;
+enum class DistanceModel : unsigned char;
 
 using uint = unsigned int;
 

core/devformat.h

@@ -6,7 +6,7 @@
 
 using uint = unsigned int;
 
-enum Channel {
+enum Channel : unsigned char {
     FrontLeft = 0,
     FrontRight,
     FrontCenter,