Complete translucency support for Win32 - tested w/ NEWT

https://jogamp.org/bugzilla/show_bug.cgi?id=517

- Adding some Windows DWM entries to GDI (manual) for translucency support
- Add translucency setting in WindowsWGLGraphicsConfiguration*

1 files changed, 21 insertions, 1 deletions

diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
index a82a7a38c..989906514 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
@@ -48,7 +48,9 @@ import javax.media.opengl.GLException;
 import javax.media.opengl.GLPbuffer;
 import javax.media.opengl.GLProfile;
 
+import jogamp.nativewindow.windows.DWM_BLURBEHIND;
 import jogamp.nativewindow.windows.GDI;
+import jogamp.nativewindow.windows.MARGINS;
 import jogamp.nativewindow.windows.PIXELFORMATDESCRIPTOR;
 import jogamp.opengl.GLGraphicsConfigurationUtil;
 
@@ -164,9 +166,27 @@ public class WindowsWGLGraphicsConfiguration extends DefaultGraphicsConfiguratio
                                   " for device context " + toHexString(hdc) +
                                   ": error code " + GDI.GetLastError());
         }
+        if(!caps.isBackgroundOpaque()) {
+            final long hwnd = GDI.WindowFromDC(hdc);
+            DWM_BLURBEHIND bb = DWM_BLURBEHIND.create();
+            bb.setDwFlags(GDI.DWM_BB_ENABLE);
+            bb.setFEnable(1);
+            boolean ok = GDI.DwmEnableBlurBehindWindow(hwnd, bb);
+            if(ok) {
+                MARGINS m = MARGINS.create();
+                m.setCxLeftWidth(-1);
+                m.setCxRightWidth(-1);
+                m.setCyBottomHeight(-1);
+                m.setCyTopHeight(-1);
+                ok = GDI.DwmExtendFrameIntoClientArea(hwnd, m);
+            }
+            if(DEBUG) {
+                System.err.println("!!! translucency enabled on wnd: 0x"+Long.toHexString(hwnd)+" - ok: "+ok);
+            }
+        }
         if (DEBUG) {
             System.err.println("!!! setPixelFormat (ARB): hdc "+toHexString(hdc) +", "+caps);
-        }        
+        }
         setCapsPFD(caps);
     }