From 48e3f7c6b376df34a646fc30096924da42cd6d47 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Wed, 11 Aug 2010 16:18:41 +0000
Subject: [PATCH] Implement ticking groups.

---
 src/asset.cpp  |  5 +++++
 src/asset.h    | 18 +++++++++++++++---
 src/ticker.cpp | 45 ++++++++++++++++++++++++---------------------
 3 files changed, 44 insertions(+), 24 deletions(-)

diff --git a/src/asset.cpp b/src/asset.cpp
index 4d8e416f..1f6c111f 100644
--- a/src/asset.cpp
+++ b/src/asset.cpp
@@ -28,6 +28,11 @@ Asset::~Asset()
 {
 }
 
+Asset::Group Asset::GetGroup()
+{
+    return GROUP_DEFAULT;
+}
+
 void Asset::TickGame(float delta_time)
 {
 
diff --git a/src/asset.h b/src/asset.h
index c3487b52..8adc70b2 100644
--- a/src/asset.h
+++ b/src/asset.h
@@ -19,18 +19,30 @@
 class Asset
 {
     friend class Ticker;
+    friend class TickerData;
 
 public:
     Asset();
     virtual ~Asset();
 
-    virtual void TickGame(float delta_time);
-    virtual void TickRender(float delta_time);
-
     virtual void Ref();
     virtual int Unref();
 
 protected:
+    typedef enum
+    {
+        GROUP_BEFORE = 0,
+        GROUP_DEFAULT,
+        GROUP_AFTER,
+        GROUP_COUNT
+    }
+    Group;
+
+    virtual Group GetGroup();
+
+    virtual void TickGame(float delta_time);
+    virtual void TickRender(float delta_time);
+
     Asset *next;
     int ref, destroy;
 };
diff --git a/src/ticker.cpp b/src/ticker.cpp
index d1c43fae..8d73d56e 100644
--- a/src/ticker.cpp
+++ b/src/ticker.cpp
@@ -24,9 +24,10 @@ static class TickerData
 
 public:
     TickerData() :
-        list(0),
         nassets(0)
     {
+        for (int i = 0; i < Asset::GROUP_COUNT; i++)
+            list[i] = NULL;
     }
 
     ~TickerData()
@@ -36,7 +37,7 @@ public:
     }
 
 private:
-    Asset *list;
+    Asset *list[Asset::GROUP_COUNT];
     int nassets;
 }
 tickerdata;
@@ -49,37 +50,39 @@ static TickerData * const data = &tickerdata;
 
 void Ticker::Register(Asset *asset)
 {
-    asset->next = data->list;
-    data->list = asset;
+    int i = asset->GetGroup();
+    asset->next = data->list[i];
+    data->list[i] = asset;
     data->nassets++;
 }
 
 void Ticker::TickGame(float delta_time)
 {
     /* Garbage collect objects that can be destroyed */
-    for (Asset *asset = data->list, *prev = NULL;
-         asset;
-         prev = asset, asset = asset->next)
-        if (asset->destroy)
-        {
-            if (prev)
-                prev->next = asset->next;
-            else
-                data->list = asset->next;
-
-            data->nassets--;
-            delete asset;
-        }
+    for (int i = 0; i < Asset::GROUP_COUNT; i++)
+        for (Asset *a = data->list[i], *prev = NULL; a; prev = a, a = a->next)
+            if (a->destroy)
+            {
+                if (prev)
+                    prev->next = a->next;
+                else
+                    data->list[i] = a->next;
+
+                data->nassets--;
+                delete a;
+            }
 
     /* Tick objects for the game loop */
-    for (Asset *asset = data->list; asset; asset = asset->next)
-        asset->TickGame(delta_time);
+    for (int i = 0; i < Asset::GROUP_COUNT; i++)
+        for (Asset *a = data->list[i]; a; a = a->next)
+            a->TickGame(delta_time);
 }
 
 void Ticker::TickRender(float delta_time)
 {
     /* Tick objects for the render loop */
-    for (Asset *asset = data->list; asset; asset = asset->next)
-        asset->TickRender(delta_time);
+    for (int i = 0; i < Asset::GROUP_COUNT; i++)
+        for (Asset *a = data->list[i]; a; a = a->next)
+            a->TickRender(delta_time);
 }