added option to re-route default framebuffer to be not 0

include/ACGL/OpenGL/GL.hh

@@ -125,6 +125,12 @@
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
+#if ACGL_OPENGL_VERSION > 32
+// prevents QT from redefining the debug functions
+#define GL_ARB_debug_output
+#define GL_KHR_debug
+#endif
+
 void CHECKGLERROR();
 
 #ifdef ACGL_OPENGL_ES

include/ACGL/OpenGL/Tools.hh

@@ -20,6 +20,12 @@
 namespace ACGL{
 namespace OpenGL{
 
+//! the set framebuffer will replace framebuffer 0
+void setDefaultFramebuffer( GLuint _id );
+
+//! can replace glBindFramebuffer( GL_FRAMEBUFFER, 0 ) if the window toolkit needs to use a FB != 0 as the default
+void bindDefaultFramebuffer();
+
 //! returns the size in bytes of the common gl types named by there GLenums (GL_BYTE, GL_UNSIGNED_INT etc.)
 //! returns 0 for unknown types, so be careful ;-)
 GLint getGLTypeSize ( GLenum _type );

src/ACGL/OpenGL/Objects/FrameBufferObject.cc

@@ -293,7 +293,7 @@ SharedTextureData FrameBufferObject::getImageData(GLsizei _width, GLsizei _heigh
     size_t paddingPerRow = ( packingAlignment - (bytesOfDataPerRow % packingAlignment) ) % packingAlignment;
     GLubyte* frameBufferData = new GLubyte[_height * (bytesOfDataPerRow + paddingPerRow) ];
 
-    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    ACGL::OpenGL::bindDefaultFramebuffer();
     
 #ifndef ACGL_OPENGLES_VERSION_20
     if(_readBuffer != GL_INVALID_ENUM)

src/ACGL/OpenGL/Tools.cc

@@ -15,6 +15,18 @@ using namespace std;
 namespace ACGL{
 namespace OpenGL{
 
+GLuint g_ACGL_defaultFramebuffer = 0;
+
+void setDefaultFramebuffer( GLuint _id )
+{
+    g_ACGL_defaultFramebuffer = _id;
+}
+
+void bindDefaultFramebuffer()
+{
+    glBindFramebuffer( GL_FRAMEBUFFER, g_ACGL_defaultFramebuffer );
+}
+
 #if (ACGL_OPENGL_VERSION >= 30)
 bool doesSupportExtension( const char *_extensionName )
 {