0030931: Visualization, TKOpenGl - do not render into GL_FRONT within "GDI Generic...

OpenGl_Workspace now disables at initialization time
OpenGl_View::SetImmediateModeDrawToFront() property in case of "GDI Generic" OpenGL implementation.

OpenGl_View::redrawImmediate() - fixed no buffer swap in case of
myTransientDrawToFront without offscreen FBO.

diff --git a/src/OpenGl/OpenGl_View_Redraw.cxx b/src/OpenGl/OpenGl_View_Redraw.cxx
index 5f83913b0d26f907e699208d5b0667e2d83a30ff..fd0acf55bb09b85ed1f85d146ee949228d588332 100644 (file)
--- a/src/OpenGl/OpenGl_View_Redraw.cxx
+++ b/src/OpenGl/OpenGl_View_Redraw.cxx
@@ -817,7 +817,7 @@ bool OpenGl_View::redrawImmediate (const Graphic3d_Camera::Projection theProject
                                    OpenGl_FrameBuffer*                theOitAccumFbo,
                                    const Standard_Boolean             theIsPartialUpdate)
 {
-  Handle(OpenGl_Context) aCtx = myWorkspace->GetGlContext();
+  const Handle(OpenGl_Context)& aCtx = myWorkspace->GetGlContext();
   GLboolean toCopyBackToFront = GL_FALSE;
   if (theDrawFbo == theReadFbo
    && theDrawFbo != NULL)
@@ -855,6 +855,7 @@ bool OpenGl_View::redrawImmediate (const Graphic3d_Camera::Projection theProject
     }
     else
     {
+      toCopyBackToFront    = GL_FALSE;
       myBackBufferRestored = Standard_False;
     }
   }

diff --git a/src/OpenGl/OpenGl_Workspace.cxx b/src/OpenGl/OpenGl_Workspace.cxx
index adfc4902da40f0e58f79e3d5d79c8467b7bce669..c13bcb3ccaa81c0adc8fe69b2e37fcddc92f479a 100644 (file)
--- a/src/OpenGl/OpenGl_Workspace.cxx
+++ b/src/OpenGl/OpenGl_Workspace.cxx
@@ -146,6 +146,12 @@ OpenGl_Workspace::OpenGl_Workspace (OpenGl_View* theView, const Handle(OpenGl_Wi
 
     glHint (GL_LINE_SMOOTH_HINT,    GL_FASTEST);
     glHint (GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
+    if (myGlContext->Vendor() == "microsoft corporation"
+    && !myGlContext->IsGlGreaterEqual (1, 2))
+    {
+      // this software implementation causes too slow rendering into GL_FRONT on modern Windows
+      theView->SetImmediateModeDrawToFront (false);
+    }
   #endif
   }