Ticket #3191: glut3191.diff

src/kits/opengl/glut/glutWindow.cpp

@@ -364 +364 @@
 void
 glutSwapBuffers()
 {
+    // don't swap anything in single buffer mode
+    if(gState.displayMode & GLUT_DOUBLE)
     gState.currentWindow->SwapBuffers();
 }
 

src/kits/opengl/glut/glutEvent.cpp

@@ -340 +340 @@
       gState.currentWindow->UnlockGL();
 }
 
+// this stores the original display funcion
+static GLUTdisplayCB __displayFunc;
+
+// new display function with swap buffers automagically appended
+void __singleBufferDisplay(void)
+{
+  __displayFunc();
+  gState.currentWindow->SwapBuffers();
+}
+
+// switchs the display function
+void __emulateSingleBuffer(void)
+{
+  __displayFunc = gState.currentWindow->display;
+  gState.currentWindow->display = __singleBufferDisplay;
+}
+
 /***********************************************************
  *  FUNCTION:   glutMainLoop (3.1)
  *
@@ -350 +367 @@
   if (!gState.windowListSize)
     __glutFatalUsage("main loop entered with no windows created.");
 
+    // Emulate single buffer for Haiku software renderer
+    if(!(gState.displayMode & GLUT_DOUBLE))
+          __emulateSingleBuffer();
+
   if(gState.currentWindow)
       gState.currentWindow->UnlockGL();