Require explicit swap_buffer

include/scigl_render/render/offscreen_render.hpp

@@ -51,10 +51,13 @@ public:
   void *do_read();
 
   /*!
-  Unmaps the OpenGL memory and swaps front- & backbuffer.
+  Unmaps the OpenGL memory.
   */
   void end_read();
 
+  /*! Swap the front- and backbuffer */
+  void swap_buffers();
+
 private:
   int width;
   int height;
@@ -66,8 +69,5 @@ private:
   int backbuffer_index = 0;
   // transfer from pbo to CPU memory
   int frontbuffer_index = 1;
-
-  /*! Swap the front- and backbuffer */
-  void swap_buffers();
 };
 } // namespace scigl_render

src/example/example_render.cpp

@@ -52,6 +52,7 @@ void ExampleRender::next_frame(const CvCamera &camera, const Model &model,
   check_gl_error("synchronous reading from pbo");
   display_data(data);
   offscreen_render.end_read();
+  offscreen_render.swap_buffers();
   check_gl_error("end synchronous reading");
 }
 

src/render/offscreen_render.cpp

@@ -56,7 +56,6 @@ void *OffscreenRender::do_read()
 void OffscreenRender::end_read()
 {
   glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
-  swap_buffers();
 }
 
 void OffscreenRender::swap_buffers()