Fixed Issue 213: Expose GLCaps from GLDrawable

Added getChosenGLCapabilities() to the GLDrawable interface.
Implemented on Windows, Unix and Mac OS X platforms with various
techniques. Attempts to provide correct answers in all cases, even
when the GLCapabilitiesChooser mechanism is not supported. Required
addition of new platform-specific Java code in most cases to either
re-convert existing PIXELFORMATDESCRIPTORS / XVisualInfos, or to query
the pixel format or visual chosen for drawables like pbuffers for
which the chooser mechanism is not (yet) implemented. Tested on
Windows, Solaris/x86, and Mac OS X with on-screen, off-screen and
pbuffer drawables. (Full support for the Java2D/JOGL bridge is not yet
in place; the answer returned from the GLJPanel in this case is
currently the default GLCapabilities, and it is likely that "external"
GLDrawables will return null.)


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@989 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 38 insertions, 0 deletions

diff --git a/src/classes/com/sun/opengl/impl/x11/X11PbufferGLDrawable.java b/src/classes/com/sun/opengl/impl/x11/X11PbufferGLDrawable.java
index 27abdf5b6..b03fdde03 100644
--- a/src/classes/com/sun/opengl/impl/x11/X11PbufferGLDrawable.java
+++ b/src/classes/com/sun/opengl/impl/x11/X11PbufferGLDrawable.java
@@ -166,6 +166,34 @@ public class X11PbufferGLDrawable extends X11GLDrawable {
       this.display = display;
       drawable = tmpBuffer;
       this.fbConfig = fbConfig;
+      
+      // Pick innocent query values if multisampling or floating point buffers not available
+      int sbAttrib      = X11GLDrawableFactory.isMultisampleAvailable() ? GLXExt.GLX_SAMPLE_BUFFERS_ARB : GLX.GLX_RED_SIZE;
+      int samplesAttrib = X11GLDrawableFactory.isMultisampleAvailable() ? GLXExt.GLX_SAMPLES_ARB : GLX.GLX_RED_SIZE;
+      int floatNV       = capabilities.getPbufferFloatingPointBuffers() ? GLX.GLX_FLOAT_COMPONENTS_NV : GLX.GLX_RED_SIZE;
+
+      // Query the fbconfig to determine its GLCapabilities
+      int[] iattribs = {
+        GLX.GLX_DOUBLEBUFFER,
+        GLX.GLX_STEREO,
+        GLX.GLX_RED_SIZE,
+        GLX.GLX_GREEN_SIZE,
+        GLX.GLX_BLUE_SIZE,
+        GLX.GLX_ALPHA_SIZE,
+        GLX.GLX_DEPTH_SIZE,
+        GLX.GLX_STENCIL_SIZE,
+        GLX.GLX_ACCUM_RED_SIZE,
+        GLX.GLX_ACCUM_GREEN_SIZE,
+        GLX.GLX_ACCUM_BLUE_SIZE,
+        GLX.GLX_ACCUM_ALPHA_SIZE,
+        sbAttrib,
+        samplesAttrib,        
+        floatNV
+      };
+
+      int[] ivalues = new int[iattribs.length];
+      queryFBConfig(display, fbConfig, iattribs, iattribs.length, ivalues);
+      setChosenGLCapabilities(X11GLDrawableFactory.attribList2GLCapabilities(iattribs, iattribs.length, ivalues, true));
 
       // Determine the actual width and height we were able to create.
       int[] tmp = new int[1];
@@ -198,4 +226,14 @@ public class X11PbufferGLDrawable extends X11GLDrawable {
     }
     return tmp[0];
   }
+
+  private void queryFBConfig(long display, GLXFBConfig fbConfig, int[] attribs, int nattribs, int[] values) {
+    int[] tmp = new int[1];
+    for (int i = 0; i < nattribs; i++) {
+      if (GLX.glXGetFBConfigAttrib(display, fbConfig, attribs[i], tmp, 0) != 0) {
+        throw new GLException("glXGetFBConfigAttrib failed");
+      }
+      values[i] = tmp[0];
+    }
+  }
 }