FIxed rendering artifacts in OpenGL canvas.

common/gal/opengl/opengl_compositor.cpp

@@ -69,7 +69,7 @@ void OPENGL_COMPOSITOR::Initialize()
 
     // Use here a size of 24 bits for the depth buffer, 8 bits for the stencil buffer
     // this is required later for anti-aliasing
-    glRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, m_width, m_height );
+    glRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, m_width, m_height );
     glFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT,
                                   GL_RENDERBUFFER_EXT, m_depthBuffer );
 

common/gal/opengl/opengl_gal.cpp

@@ -41,7 +41,7 @@
 using namespace KIGFX;
 
 static void InitTesselatorCallbacks( GLUtesselator* aTesselator );
-const int glAttributes[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 16, 0 };
+const int glAttributes[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 8, 0 };
 wxGLContext* OPENGL_GAL::glContext = NULL;
 
 OPENGL_GAL::OPENGL_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,