Add remove surface method to both examples, press backspace and delete selected surface

example-fboTexture/src/ofApp.cpp

@@ -94,6 +94,7 @@ void ofApp::keyPressed(int key)
         case 'f': ofToggleFullscreen(); break;
         case 's': surfaceManager.saveXmlSettings("surfaces.xml"); break;
         case 'a': setFboAsTexture(); break;
+        case OF_KEY_BACKSPACE: surfaceManager.removeSelectedSurface(); break;
         default: break;
     }
 }

example/src/ofApp.cpp

@@ -69,6 +69,7 @@ void ofApp::keyPressed(int key)
         case 'n': addSurface(); break;
         case 'f': ofToggleFullscreen(); break;
         case 's': surfaceManager.saveXmlSettings("surfaces.xml"); break;
+        case OF_KEY_BACKSPACE: surfaceManager.removeSelectedSurface(); break;
         default: break;
     }
 }

src/ofxSurfaceManager.cpp

@@ -82,6 +82,20 @@ void ofxSurfaceManager::addSurface(int surfaceType, ofTexture* texturePtr, vecto
     }
 }
 
+void ofxSurfaceManager::removeSelectedSurface()
+{
+    if ( selectedSurface == NULL ) return;
+    
+    for ( int i=0; i<surfaces.size(); i++ ) {
+        if ( surfaces[i] == selectedSurface ) {
+            delete surfaces[i];
+            surfaces.erase(surfaces.begin()+i);
+            selectedSurface = NULL;
+            break;
+        }
+    }
+}
+
 void ofxSurfaceManager::manageMemory()
 {
     // check if each of the sources is assigned to a surface or not

src/ofxSurfaceManager.h

@@ -20,6 +20,7 @@ public:
     void addSurface(int surfaceType, ofTexture* texturePtr);
     void addSurface(int surfaceType, vector<ofVec2f> vertices, vector<ofVec2f> texCoords);
     void addSurface(int surfaceType, ofTexture* texturePtr, vector<ofVec2f> vertices, vector<ofVec2f> texCoords);
+    void removeSelectedSurface();
     void manageMemory(); // deletes unasigned sources
     void clear();
     void saveXmlSettings(string fileName);