OpenGL tweaks.

juce_amalgamated.cpp

@@ -244015,7 +244015,12 @@ public:
 	void deleteContext()
 	{
 		makeInactive();
-		wglDeleteContext (renderContext);
+
+		if (renderContext != 0)
+		{
+			wglDeleteContext (renderContext);
+			renderContext = 0;
+		}
 	}
 
 	bool makeActive() const throw()
@@ -259143,8 +259148,12 @@ public:
 	{
 		makeInactive();
 
-		ScopedXLock xlock;
-		glXDestroyContext (display, renderContext);
+		if (renderContext != 0)
+		{
+			ScopedXLock xlock;
+			glXDestroyContext (display, renderContext);
+			renderContext = 0;
+		}
 	}
 
 	bool makeActive() const throw()
@@ -266828,6 +266837,9 @@ public:
 	{
 		makeInactive();
 		[renderContext clearDrawable];
+		[renderContext setView: nil];
+		[view setOpenGLContext: nil];
+		renderContext = nil;
 	}
 
 	bool makeActive() const throw()
@@ -272417,6 +272429,9 @@ public:
 	{
 		makeInactive();
 		[renderContext clearDrawable];
+		[renderContext setView: nil];
+		[view setOpenGLContext: nil];
+		renderContext = nil;
 	}
 
 	bool makeActive() const throw()

juce_amalgamated.h

@@ -56878,6 +56878,10 @@ public:
 	virtual void* getRawContext() const throw() = 0;
 
 	/** Deletes the context.
+
+		This must only be called on the message thread, or will deadlock.
+		On background threads, call getCurrentContext()->deleteContext(), but be careful not
+		to call any other OpenGL function afterwards.
 		This doesn't touch other resources, such as window handles, etc.
 		You'll probably never have to call this method directly.
 	*/

src/gui/components/special/juce_OpenGLComponent.h

@@ -147,6 +147,10 @@ public:
     virtual void* getRawContext() const throw() = 0;
 
     /** Deletes the context.
+
+        This must only be called on the message thread, or will deadlock.
+        On background threads, call getCurrentContext()->deleteContext(), but be careful not
+        to call any other OpenGL function afterwards.
         This doesn't touch other resources, such as window handles, etc.
         You'll probably never have to call this method directly.
     */

src/native/linux/juce_linux_Windowing.cpp

@@ -3244,8 +3244,12 @@ public:
     {
         makeInactive();
 
-        ScopedXLock xlock;
-        glXDestroyContext (display, renderContext);
+        if (renderContext != 0)
+        {
+            ScopedXLock xlock;
+            glXDestroyContext (display, renderContext);
+            renderContext = 0;
+        }
     }
 
     bool makeActive() const throw()

src/native/mac/juce_mac_OpenGLComponent.mm

@@ -184,6 +184,9 @@ public:
     {
         makeInactive();
         [renderContext clearDrawable];
+        [renderContext setView: nil];
+        [view setOpenGLContext: nil];
+        renderContext = nil;
     }
 
     bool makeActive() const throw()

src/native/windows/juce_win32_OpenGLComponent.cpp

@@ -123,7 +123,12 @@ public:
     void deleteContext()
     {
         makeInactive();
-        wglDeleteContext (renderContext);
+
+        if (renderContext != 0)
+        {
+            wglDeleteContext (renderContext);
+            renderContext = 0;
+        }
     }
 
     bool makeActive() const throw()