Add fbo source protection against not allocating in derived classes

src/Sources/FboSource.cpp

@@ -3,7 +3,7 @@
 namespace ofx {
   namespace piMapper {
     FboSource::FboSource() : fbo(NULL) {
-      name = PIMAPPER_DEF_FBO_SOURCE_NAME;
+      name = PIMAPPER_FBO_SOURCE_DEF_NAME;
       loadable = false;
       loaded = false;
       type = SourceType::SOURCE_TYPE_FBO;
@@ -32,6 +32,13 @@ namespace ofx {
     void FboSource::onAppSetup(ofEventArgs &args) {
       ofRemoveListener(ofEvents().setup, this, &FboSource::onAppSetup, OF_EVENT_ORDER_BEFORE_APP);
       setup();
+      
+      // Check if FBO was allocated in user defined setup
+      // If not, show warning and alocate to avoid panic
+      if (!fbo->isAllocated()) {
+        ofLogWarning("FboSource::onAppSetup") << "FBO not allocated, allocating with default values";
+        allocate(PIMAPPER_FBO_SOURCE_DEF_WIDTH, PIMAPPER_FBO_SOURCE_DEF_HEIGHT);
+      }
     }
     
     void FboSource::onAppUpdate(ofEventArgs &args) {

src/Sources/FboSource.h

@@ -10,7 +10,9 @@ class YourGenerativeSource : public FboSource {
 #include "ofMain.h"
 #include "BaseSource.h"
 
-#define PIMAPPER_DEF_FBO_SOURCE_NAME "FBO Source"
+#define PIMAPPER_FBO_SOURCE_DEF_NAME "FBO Source"
+#define PIMAPPER_FBO_SOURCE_DEF_WIDTH 500
+#define PIMAPPER_FBO_SOURCE_DEF_HEIGHT 500
 
 namespace ofx {
   namespace piMapper {
@@ -38,12 +40,15 @@ namespace ofx {
       virtual void draw() {}; // But this is the only place where you shoud do drawing
       virtual void exit() {};
       
-      // Use these to set up FBo itself
-      void allocate(int width, int height);
-      void clear(); // The only method from BaseSource to be overriden
+      // The only method from BaseSource to be overriden
+      void clear();
       
     protected:
       ofFbo* fbo;
+      
+      // Use this instead fbo->allocate as it sets other source related settings
+      // It is protected to force the user to create derived FBO sources from this
+      void allocate(int width, int height);
     };
   } // namespace piMapper
 } // namespace ofx