2 files changed, 80 insertions, 11 deletions

diff --git a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
index 31e52b86c..d69b02bb9 100644
--- a/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
+++ b/src/jogl/classes/jogamp/opengl/GLGraphicsConfigurationUtil.java
@@ -101,17 +101,16 @@ public class GLGraphicsConfigurationUtil {
      * @return bitmask representing the input boolean in exclusive or logic, ie only one bit will be set.
      */
     public static final int getExclusiveWinAttributeBits(boolean isOnscreen, boolean isFBO, boolean isPBuffer, boolean isBitmap) {
-        int winattrbits = 0;
+        final int winattrbits;
         if(isOnscreen) {
-            winattrbits |= WINDOW_BIT;
+            winattrbits = WINDOW_BIT;
         } else if(isFBO) {
-            winattrbits |= FBO_BIT;
+            winattrbits = FBO_BIT;
         } else if(isPBuffer ){
-            winattrbits |= PBUFFER_BIT;
+            winattrbits = PBUFFER_BIT;
         } else if(isBitmap) {
-            winattrbits |= BITMAP_BIT;                
-        }
-        if(0 == winattrbits) {
+            winattrbits = BITMAP_BIT;                
+        } else {
             throw new InternalError("Empty bitmask");
         }
         return winattrbits;
@@ -287,4 +286,35 @@ public class GLGraphicsConfigurationUtil {
         }
         return capsRequested;
     }
+    
+    public static GLCapabilitiesImmutable clipRGBAGLCapabilities(GLCapabilitiesImmutable caps, boolean allowRGB555)
+    {
+        final int iR = caps.getRedBits();
+        final int iG = caps.getGreenBits();
+        final int iB = caps.getBlueBits();
+        final int iA = caps.getAlphaBits();
+        final int oR = clipColor(iR, allowRGB555);
+        final int oG = clipColor(iG, allowRGB555);
+        final int oB = clipColor(iB, allowRGB555);
+        final int oA = 0 < iA ? oR : 0 ; // align alpha to red if requested 
+        if( iR != oR || iG != oG || iB != oB || iA != oA ) {
+            final GLCapabilities caps2 = (GLCapabilities) caps.cloneMutable();
+            caps2.setRedBits(oR);
+            caps2.setGreenBits(oG);
+            caps2.setBlueBits(oB);
+            caps2.setAlphaBits(oA);
+            return caps2;            
+        }
+        return caps;
+    }
+    
+    public static int clipColor(final int compIn, final boolean allowRGB555) {
+        final int compOut;
+        if( 5 < compIn || !allowRGB555 ) {
+            compOut = 8; 
+        } else {
+            compOut = 5;
+        }        
+        return compOut;
+    }
 }
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WGLGLCapabilities.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WGLGLCapabilities.java
index 99064b123..10a4b56d5 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WGLGLCapabilities.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WGLGLCapabilities.java
@@ -32,7 +32,9 @@ import java.nio.IntBuffer;
 
 import jogamp.nativewindow.windows.GDI;
 import jogamp.nativewindow.windows.PIXELFORMATDESCRIPTOR;
+import jogamp.opengl.GLGraphicsConfigurationUtil;
 
+import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeWindowException;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLCapabilities;
@@ -65,10 +67,11 @@ public class WGLGLCapabilities extends GLCapabilities {
       setAccumAlphaBits(pfd.getCAccumAlphaBits());
       setDepthBits(pfd.getCDepthBits());
       setStencilBits(pfd.getCStencilBits());
-      setDoubleBuffered((pfd.getDwFlags() & GDI.PFD_DOUBLEBUFFER) != 0);
-      setStereo((pfd.getDwFlags() & GDI.PFD_STEREO) != 0);
-      setHardwareAccelerated((pfd.getDwFlags() & GDI.PFD_GENERIC_FORMAT) == 0
-                          || (pfd.getDwFlags() & GDI.PFD_GENERIC_ACCELERATED) != 0);
+      final int dwFlags = pfd.getDwFlags();
+      setDoubleBuffered((dwFlags & GDI.PFD_DOUBLEBUFFER) != 0);
+      setStereo((dwFlags & GDI.PFD_STEREO) != 0);
+      setHardwareAccelerated((dwFlags & GDI.PFD_GENERIC_FORMAT) == 0
+                          || (dwFlags & GDI.PFD_GENERIC_ACCELERATED) != 0);
       // n/a with non ARB/GDI method:
       //       multisample
       //       opaque
@@ -76,6 +79,42 @@ public class WGLGLCapabilities extends GLCapabilities {
 
       return true;
   }
+    
+  public static final String PFD2String(PIXELFORMATDESCRIPTOR pfd, int pfdID) {
+      final int dwFlags = pfd.getDwFlags();
+      StringBuffer sb = new StringBuffer();
+      boolean sep = false;
+      
+      if( 0 != (GDI.PFD_DRAW_TO_WINDOW & dwFlags ) ) {
+          sep = true;
+          sb.append("window");
+      }
+      if( 0 != (GDI.PFD_DRAW_TO_BITMAP & dwFlags ) ) {
+          if(sep) { sb.append(CSEP); } sep=true;
+          sb.append("bitmap");
+      }
+      if( 0 != (GDI.PFD_SUPPORT_OPENGL & dwFlags ) ) {
+          if(sep) { sb.append(CSEP); } sep=true;
+          sb.append("opengl");
+      }
+      if( 0 != (GDI.PFD_DOUBLEBUFFER & dwFlags ) ) {
+          if(sep) { sb.append(CSEP); } sep=true;
+          sb.append("dblbuf");
+      }
+      if( 0 != (GDI.PFD_STEREO & dwFlags ) ) {
+          if(sep) { sb.append(CSEP); } sep=true;
+          sb.append("stereo");
+      }
+      if( 0 == (GDI.PFD_GENERIC_FORMAT & dwFlags ) || 0 == (GDI.PFD_GENERIC_ACCELERATED & dwFlags ) ) {
+          if(sep) { sb.append(CSEP); } sep=true;
+          sb.append("hw-accel");
+      }        
+      return "PFD[id = "+pfdID+" (0x"+Integer.toHexString(pfdID)+
+              "), colorBits "+pfd.getCColorBits()+", rgba "+pfd.getCRedBits()+ESEP+pfd.getCGreenBits()+ESEP+pfd.getCBlueBits()+ESEP+pfd.getCAlphaBits()+
+              ", accum-rgba "+pfd.getCAccumRedBits()+ESEP+pfd.getCAccumGreenBits()+ESEP+pfd.getCAccumBlueBits()+ESEP+pfd.getCAccumAlphaBits()+
+              ", dp/st/ms: "+pfd.getCDepthBits()+ESEP+pfd.getCStencilBits()+ESEP+"0"+
+              ", flags: "+sb.toString();
+  }
 
   public boolean setValuesByARB(final IntBuffer iattribs, final int niattribs, final IntBuffer iresults) {
       arb_pixelformat = 1;