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*

3 files changed, 42 insertions, 1 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
index 19a664071..cc7a578cd 100644
--- a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
+++ b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
@@ -145,4 +145,17 @@ public class GLGraphicsConfigurationUtil {
         return capsRequested;
     }
 
+    public static GLCapabilitiesImmutable fixOpaqueGLCapabilities(GLCapabilitiesImmutable capsRequested, boolean isOpaque)
+    {
+        GLCapabilities caps2 = null;
+        
+        if( capsRequested.isBackgroundOpaque() != isOpaque) {
+            // fix caps ..
+            caps2 = (GLCapabilities) capsRequested.cloneMutable();
+            caps2.setBackgroundOpaque(isOpaque);
+            return caps2;
+        }
+        return capsRequested;
+    }
+    
 }
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);
     }
     
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
index 1c607d2c7..178f2777c 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
@@ -42,6 +42,7 @@ import javax.media.nativewindow.GraphicsConfigurationFactory;
 import javax.media.nativewindow.CapabilitiesImmutable;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindowFactory;
+import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLCapabilitiesImmutable;
 import javax.media.opengl.GLCapabilitiesChooser;
 import javax.media.opengl.GLContext;
@@ -298,9 +299,14 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
         }
 
         GLCapabilitiesImmutable capsChosen = (GLCapabilitiesImmutable) config.getChosenCapabilities();
+        boolean isOpaque = capsChosen.isBackgroundOpaque() && GDI.DwmIsCompositionEnabled();
         boolean onscreen = capsChosen.isOnscreen();
         boolean usePBuffer = capsChosen.isPBuffer();
         GLProfile glProfile = capsChosen.getGLProfile();
+        
+        if(DEBUG) {
+            System.err.println("!!! translucency requested: "+(!capsChosen.isBackgroundOpaque())+", compositioning enabled: "+GDI.DwmIsCompositionEnabled()+" -> translucency "+(!isOpaque));
+        }
 
         WGLGLCapabilities pixelFormatCaps = null; // chosen or preset PFD ID's caps
         boolean pixelFormatSet = false; // indicates a preset PFD ID [caps]
@@ -316,6 +322,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
             }
             pixelFormatSet = true;
             pixelFormatCaps = WindowsWGLGraphicsConfiguration.wglARBPFID2GLCapabilities(sharedResource, hdc, presetPFDID, glProfile, onscreen, usePBuffer);
+            pixelFormatCaps = (WGLGLCapabilities) GLGraphicsConfigurationUtil.fixOpaqueGLCapabilities(pixelFormatCaps, isOpaque);
         } else {
             int recommendedIndex = -1; // recommended index
 
@@ -393,6 +400,7 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
                                       " chosen pfdID: native recommended "+ (recommendedIndex+1) +
                                       " chosen idx "+chosenIndex);
             }
+            pixelFormatCaps = (WGLGLCapabilities) GLGraphicsConfigurationUtil.fixOpaqueGLCapabilities(pixelFormatCaps, isOpaque);
             if (DEBUG) {
                 System.err.println("!!! chosen pfdID (ARB): native recommended "+ (recommendedIndex+1) +
                                    " chosen "+pixelFormatCaps);