Use some macros to help with deriving types

1 files changed, 10 insertions, 11 deletions

diff --git a/Alc/alcEcho.c b/Alc/alcEcho.c
index 55a5b599..1d06e68a 100644
--- a/Alc/alcEcho.c
+++ b/Alc/alcEcho.c
@@ -31,8 +31,7 @@
 
 
 typedef struct ALechoState {
-    // Must be first in all effects!
-    ALeffectState state;
+    DERIVE_FROM_TYPE(ALeffectState);
 
     ALfloat *SampleBuffer;
     ALuint BufferLength;
@@ -54,7 +53,7 @@ typedef struct ALechoState {
 
 static ALvoid EchoDestroy(ALeffectState *effect)
 {
-    ALechoState *state = (ALechoState*)effect;
+    ALechoState *state = GET_PARENT_TYPE(ALechoState, ALeffectState, effect);
     if(state)
     {
         free(state->SampleBuffer);
@@ -65,7 +64,7 @@ static ALvoid EchoDestroy(ALeffectState *effect)
 
 static ALboolean EchoDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
 {
-    ALechoState *state = (ALechoState*)effect;
+    ALechoState *state = GET_PARENT_TYPE(ALechoState, ALeffectState, effect);
     ALuint maxlen, i;
 
     // Use the next power of 2 for the buffer length, so the tap offsets can be
@@ -92,7 +91,7 @@ static ALboolean EchoDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
 
 static ALvoid EchoUpdate(ALeffectState *effect, ALCdevice *Device, const ALeffectslot *Slot)
 {
-    ALechoState *state = (ALechoState*)effect;
+    ALechoState *state = GET_PARENT_TYPE(ALechoState, ALeffectState, effect);
     ALuint frequency = Device->Frequency;
     ALfloat lrpan, cw, g, gain;
     ALfloat dirGain;
@@ -128,7 +127,7 @@ static ALvoid EchoUpdate(ALeffectState *effect, ALCdevice *Device, const ALeffec
 
 static ALvoid EchoProcess(ALeffectState *effect, ALuint SamplesToDo, const ALfloat *RESTRICT SamplesIn, ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE])
 {
-    ALechoState *state = (ALechoState*)effect;
+    ALechoState *state = GET_PARENT_TYPE(ALechoState, ALeffectState, effect);
     const ALuint mask = state->BufferLength-1;
     const ALuint tap1 = state->Tap[0].delay;
     const ALuint tap2 = state->Tap[1].delay;
@@ -164,10 +163,10 @@ ALeffectState *EchoCreate(void)
     if(!state)
         return NULL;
 
-    state->state.Destroy = EchoDestroy;
-    state->state.DeviceUpdate = EchoDeviceUpdate;
-    state->state.Update = EchoUpdate;
-    state->state.Process = EchoProcess;
+    GET_DERIVED_TYPE(ALeffectState, state)->Destroy = EchoDestroy;
+    GET_DERIVED_TYPE(ALeffectState, state)->DeviceUpdate = EchoDeviceUpdate;
+    GET_DERIVED_TYPE(ALeffectState, state)->Update = EchoUpdate;
+    GET_DERIVED_TYPE(ALeffectState, state)->Process = EchoProcess;
 
     state->BufferLength = 0;
     state->SampleBuffer = NULL;
@@ -180,7 +179,7 @@ ALeffectState *EchoCreate(void)
     state->iirFilter.history[0] = 0.0f;
     state->iirFilter.history[1] = 0.0f;
 
-    return &state->state;
+    return GET_DERIVED_TYPE(ALeffectState, state);
 }
 
 void echo_SetParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val)