0027811: Configuration - allow building TKOpenGl with OpenGL ES on Windows

OpenGl_ShaderManager::prepareStdProgramFboBlit() now tries using extension
GL_EXT_frag_depth within OpenGL ES 2.0 when OpenGL ES 3.0 is not available.
OpenGl_View::blitBuffers() now disables Depth test
when copying depth values is not supported by OpenGL ES 2.0 hardware.

Fixed building for UWP with SDK 10.0.10240.0
Fixed building TKService, TKV3d and TKOpenGl for UWP.

OSD_Environment now defines global environment map
for emulating desktop behavior on UWP.

src/ViewerTest/ViewerTest_OpenGlCommands.cxx

@@ -165,6 +165,7 @@ void VUserDrawObj::Render(const Handle(OpenGl_Workspace)& theWorkspace) const
   aTA->Aspect()->Font();
   OpenGl_Vec4 aColor = theWorkspace->LineColor();
 
+#if !defined(GL_ES_VERSION_2_0)
   // Finally draw something to make sure UserDraw really works
   glPushAttrib(GL_ENABLE_BIT);
   glDisable(GL_LIGHTING);
@@ -176,6 +177,7 @@ void VUserDrawObj::Render(const Handle(OpenGl_Workspace)& theWorkspace) const
   glVertex3f(myCoords[0], myCoords[1], myCoords[5]);
   glEnd();
   glPopAttrib();
+#endif
 }
 
 } // end of anonymous namespace
@@ -222,6 +224,7 @@ static int VFeedback (Draw_Interpretor& theDI,
                       Standard_Integer  /*theArgNb*/,
                       const char**      /*theArgVec*/)
 {
+#if !defined(GL_ES_VERSION_2_0)
   // get the active view
   Handle(V3d_View) aView = ViewerTest::CurrentView();
   if (aView.IsNull())
@@ -363,6 +366,11 @@ static int VFeedback (Draw_Interpretor& theDI,
           << "Buffer size GL_3D_COLOR: " << aLen3D_rgba * double(sizeof(GLfloat)) / double(1024 * 1024) << " MiB\n";
     return 0;
   }
+#else
+  (void )theDI;
+  std::cout << "Command is unsupported on current platform.\n";
+  return 1;
+#endif
 }
 
 //==============================================================================