From 15adaf2877052541ac6f14286c7a38cc89fdd201 Mon Sep 17 00:00:00 2001
From: Nite Luo <darkdukey@gmail.com>
Date: Mon, 26 Jan 2015 16:37:11 -0800
Subject: [PATCH] save/restore render state

---
 cocos/renderer/CCRenderer.cpp | 41 ++++++++++++++++++++++++++++++++++-
 cocos/renderer/CCRenderer.h   | 10 ++++++++-
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/cocos/renderer/CCRenderer.cpp b/cocos/renderer/CCRenderer.cpp
index dc718d284f..e4b087dbc0 100644
--- a/cocos/renderer/CCRenderer.cpp
+++ b/cocos/renderer/CCRenderer.cpp
@@ -131,6 +131,41 @@ void RenderQueue::clear()
     _queuePosZ.clear();
 }
 
+void RenderQueue::saveRenderState()
+{
+    _isDepthEnabled = glIsEnabled(GL_DEPTH_TEST);
+    _isCullEnabled = glIsEnabled(GL_CULL_FACE);
+    glGetBooleanv(GL_DEPTH_WRITEMASK, &_isDepthWrite);
+    
+    CHECK_GL_ERROR_DEBUG();
+}
+
+void RenderQueue::restoreRenderState()
+{
+    if (_isCullEnabled)
+    {
+        glEnable(GL_CULL_FACE);
+    }
+    else
+    {
+        glDisable(GL_CULL_FACE);
+    }
+    
+    
+    if (_isDepthEnabled)
+    {
+        glEnable(GL_DEPTH_TEST);
+    }
+    else
+    {
+        glDisable(GL_DEPTH_TEST);
+    }
+    
+    glDepthMask(_isDepthWrite);
+    
+    CHECK_GL_ERROR_DEBUG();
+}
+
 //
 //
 //
@@ -465,10 +500,12 @@ void Renderer::processRenderCommand(RenderCommand* command)
     }
 }
 
-void Renderer::visitRenderQueue(const RenderQueue& queue)
+void Renderer::visitRenderQueue(RenderQueue& queue)
 {
     ssize_t size = queue.size();
     
+    queue.saveRenderState();
+    
     //Process Opaque Object
     const std::vector<RenderCommand*>& opaqueQueue = queue.getOpaqueCommands();
     if (opaqueQueue.size() > 0)
@@ -507,6 +544,8 @@ void Renderer::visitRenderQueue(const RenderQueue& queue)
         processRenderCommand(queue[index]);
     }
     flush();
+    
+    queue.restoreRenderState();
 }
 
 void Renderer::render()
diff --git a/cocos/renderer/CCRenderer.h b/cocos/renderer/CCRenderer.h
index 70392c0be4..b0c206b167 100644
--- a/cocos/renderer/CCRenderer.h
+++ b/cocos/renderer/CCRenderer.h
@@ -57,12 +57,20 @@ public:
     ssize_t getOpaqueQueueSize() const { return _queue3DOpaque.size(); }
     const std::vector<RenderCommand*>& getOpaqueCommands() const { return _queue3DOpaque; }
 
+    void saveRenderState();
+    void restoreRenderState();
+    
 protected:
     std::vector<RenderCommand*> _queue3DOpaque;
     std::vector<RenderCommand*> _queue3DTransparent;
     std::vector<RenderCommand*> _queueNegZ;
     std::vector<RenderCommand*> _queue0;
     std::vector<RenderCommand*> _queuePosZ;
+    
+    //Render State related
+    bool _isCullEnabled;
+    bool _isDepthEnabled;
+    GLboolean _isDepthWrite;
 };
 
 struct RenderStackElement
@@ -162,7 +170,7 @@ protected:
     void flushTriangles();
 
     void processRenderCommand(RenderCommand* command);
-    void visitRenderQueue(const RenderQueue& queue);
+    void visitRenderQueue(RenderQueue& queue);
 
     void fillVerticesAndIndices(const TrianglesCommand* cmd);
     void fillQuads(const QuadCommand* cmd);