Fix flocking bug

src/dusk/entity/component.h

@@ -8,13 +8,13 @@
 #pragma once
 #include "entitybase.h"
 
-#define X(enumName, type, field, init, dispose) \
+#define X(enumName, type, field, init, dispose, render) \
   // do nothing
 #include "componentlist.h"
 #undef X
 
 typedef union {
-  #define X(enumName, type, field, init, dispose) type field;
+  #define X(enumName, type, field, init, dispose, render) type field;
   #include "componentlist.h"
   #undef X
 } componentdata_t;
@@ -24,12 +24,13 @@ typedef struct {
   const char_t *name;
   void (*init)(const entityid_t, const componentid_t);
   void (*dispose)(const entityid_t, const componentid_t);
+  errorret_t (*render)(const entityid_t, const componentid_t);
 } componentdefinition_t;
 
 typedef enum {
   COMPONENT_TYPE_NULL,
 
-  #define X(enumName, type, field, init, dispose) \
+  #define X(enumName, type, field, init, dispose, render) \
     COMPONENT_TYPE_##enumName,
   #include "componentlist.h"
   #undef X
@@ -100,11 +101,20 @@ entityid_t componentGetEntitiesWithComponent(
 
 /**
  * Disposes of a component for the entity with component ID.
- * 
+ *
  * @param entityId The entity ID.
  * @param componentId The component ID.
  */
 void componentDispose(
   const entityid_t entityId,
   const componentid_t componentId
-);
+);
+
+/**
+ * Calls the render callback on every active component that defines one.
+ * Iterates all active entities and all their component slots. No-op for
+ * components whose definition has render == NULL.
+ *
+ * @return Error state.
+ */
+errorret_t componentRenderAll(void);