Merge pull request #1471 from minggo/iss1466-shader-test

reloading shader when coming to foreground

samples/TestCpp/Classes/ShaderTest/ShaderTest.cpp

@@ -150,6 +150,11 @@ ShaderNode::ShaderNode()
 {
 }
 
+ShaderNode::~ShaderNode()
+{
+    CCNotificationCenter::sharedNotificationCenter()->removeObserver(this, EVNET_COME_TO_FOREGROUND);
+}
+
 ShaderNode* ShaderNode::shaderNodeWithVertex(const char *vert, const char *frag)
 {
     ShaderNode *node = new ShaderNode();
@@ -161,6 +166,10 @@ ShaderNode* ShaderNode::shaderNodeWithVertex(const char *vert, const char *frag)
 
 bool ShaderNode::initWithVertex(const char *vert, const char *frag)
 {
+    CCNotificationCenter::sharedNotificationCenter()->addObserver(this,
+                                                                  callfuncO_selector(ShaderNode::listenBackToForeground),
+                                                                  EVNET_COME_TO_FOREGROUND,
+                                                                  NULL);
 
     loadShaderVertex(vert, frag);
 
@@ -172,9 +181,18 @@ bool ShaderNode::initWithVertex(const char *vert, const char *frag)
     setContentSize(CCSizeMake(SIZE_X, SIZE_Y));
     setAnchorPoint(ccp(0.5f, 0.5f));
     
+    m_vertFileName = vert;
+    m_fragFileName = frag;
+
     return true;
 }
 
+void ShaderNode::listenBackToForeground(CCObject *obj)
+{
+    this->setShaderProgram(NULL);
+    loadShaderVertex(m_vertFileName.c_str(), m_fragFileName.c_str());
+}
+
 void ShaderNode::loadShaderVertex(const char *vert, const char *frag)
 {
     CCGLProgram *shader = new CCGLProgram();
@@ -438,9 +456,12 @@ std::string ShaderPlasma::subtitle()
 class SpriteBlur : public CCSprite
 {
 public:
+    ~SpriteBlur();
     void setBlurSize(float f);
     bool initWithTexture(CCTexture2D* texture, const CCRect&  rect);
     void draw();
+    void initProgram();
+    void listenBackToForeground(CCObject *obj);
 
     static SpriteBlur* create(const char *pszFileName);
 
@@ -451,6 +472,11 @@ public:
     GLuint    subLocation;
 };
 
+SpriteBlur::~SpriteBlur()
+{
+    CCNotificationCenter::sharedNotificationCenter()->removeObserver(this, EVNET_COME_TO_FOREGROUND);
+}
+
 SpriteBlur* SpriteBlur::create(const char *pszFileName)
 {
     SpriteBlur* pRet = new SpriteBlur();
@@ -466,15 +492,36 @@ SpriteBlur* SpriteBlur::create(const char *pszFileName)
     return pRet;
 }
 
+void SpriteBlur::listenBackToForeground(CCObject *obj)
+{
+    setShaderProgram(NULL);
+    initProgram();
+}
+
 bool SpriteBlur::initWithTexture(CCTexture2D* texture, const CCRect& rect)
 {
     if( CCSprite::initWithTexture(texture, rect) ) 
     {
+        CCNotificationCenter::sharedNotificationCenter()->addObserver(this,
+                                                                      callfuncO_selector(SpriteBlur::listenBackToForeground),
+                                                                      EVNET_COME_TO_FOREGROUND,
+                                                                      NULL);
+        
         CCSize s = getTexture()->getContentSizeInPixels();
 
         blur_ = ccp(1/s.width, 1/s.height);
         sub_[0] = sub_[1] = sub_[2] = sub_[3] = 0;
 
+        this->initProgram();
+        
+        return true;
+    }
+
+    return false;
+}
+
+void SpriteBlur::initProgram()
+{
     GLchar * fragSource = (GLchar*) CCString::createWithContentsOfFile(
                                 CCFileUtils::sharedFileUtils()->fullPathFromRelativePath("Shaders/example_Blur.fsh"))->getCString();
     CCGLProgram* pProgram = new CCGLProgram();
@@ -502,10 +549,6 @@ bool SpriteBlur::initWithTexture(CCTexture2D* texture, const CCRect& rect)
     blurLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "blurSize");
     
     CHECK_GL_ERROR_DEBUG();
-        return true;
-    }
-
-    return false;
 }
 
 void SpriteBlur::draw()

samples/TestCpp/Classes/ShaderTest/ShaderTest.h

@@ -114,9 +114,11 @@ class ShaderNode : public CCNode
 {
 public:
     ShaderNode();
+    ~ShaderNode();
 
     bool initWithVertex(const char *vert, const char *frag);
     void loadShaderVertex(const char *vert, const char *frag);
+    void listenBackToForeground(CCObject *obj);
 
     virtual void update(float dt);
     virtual void setPosition(const CCPoint &newPosition);
@@ -130,6 +132,8 @@ private:
     ccVertex2F m_resolution;
     float      m_time;
     GLuint     m_uniformCenter, m_uniformResolution, m_uniformTime;
+    std::string m_vertFileName;
+    std::string m_fragFileName;
 };
 
 class ShaderTestScene : public TestScene