1 files changed, 139 insertions, 0 deletions
diff --git a/src/net/java/joglutils/msg/elements/BlendElement.java b/src/net/java/joglutils/msg/elements/BlendElement.java
new file mode 100644
index 0000000..2a0d488
--- /dev/null
+++ b/src/net/java/joglutils/msg/elements/BlendElement.java
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ */
+
+package net.java.joglutils.msg.elements;
+
+import java.nio.*;
+import javax.media.opengl.*;
+
+import net.java.joglutils.msg.math.*;
+import net.java.joglutils.msg.misc.*;
+import net.java.joglutils.msg.nodes.*;
+
+/** Represents the blending state of the OpenGL fixed-function pipeline. */
+
+public class BlendElement extends Element {
+  // Boilerplate
+  private static StateIndex index = State.registerElementType();
+  public StateIndex getStateIndex() { return index; }
+  public Element newInstance() {
+    return new BlendElement();
+  }
+  /** Returns the instance of this element in the passed State. */
+  public static BlendElement getInstance(State state) {
+    return (BlendElement) state.getElement(index);
+  }
+  /** Enables this element in the passed state, which should be the
+      default for a given action. */
+  public static void enable(State defaultState) {
+    BlendElement tmp = new BlendElement();
+    defaultState.setElement(tmp.getStateIndex(), tmp);
+  }
+
+  // These defaults match those in the Blend node -- is there a better way of factoring them out?
+
+  // Whether blending is enabled
+  protected boolean enabled;
+  protected Vec4f blendColor = new Vec4f();
+  protected int srcFunc = Blend.ONE;
+  protected int destFunc = Blend.ZERO;
+  protected int blendEquation = Blend.FUNC_ADD;
+
+  /** Sets all of the portions of the blending state in the passed State object. */
+  public static void set(State state,
+                         boolean enabled,
+                         Vec4f blendColor,
+                         int srcFunc,
+                         int destFunc,
+                         int blendEquation) {
+    getInstance(state).setElt(enabled,
+                              blendColor,
+                              srcFunc,
+                              destFunc,
+                              blendEquation);
+  }
+
+  /** Returns whether blending is enabled. */
+  public static boolean getEnabled(State state) {
+    return getInstance(state).enabled;
+  }
+
+  /** Returns the blending color. */
+  public static Vec4f getBlendColor(State state) {
+    return getInstance(state).blendColor;
+  }
+
+  /** Returns the source function for blending. */
+  public static int getSourceFunc(State state) {
+    return getInstance(state).srcFunc;
+  }
+
+  /** Returns the destination function for blending. */
+  public static int getDestFunc(State state) {
+    return getInstance(state).destFunc;
+  }
+
+  /** Returns the blending equation. */
+  public static int getBlendEquation(State state) {
+    return getInstance(state).blendEquation;
+  }
+
+  public void push(State state) {
+    BlendElement prev = (BlendElement) getNextInStack();
+    if (prev != null) {
+      // Pull down the data from the previous element
+      enabled = prev.enabled;
+      blendColor.set(prev.blendColor);
+      srcFunc = prev.srcFunc;
+      destFunc = prev.destFunc;
+      blendEquation = prev.blendEquation;
+    }
+  }
+
+  /** Sets all of the portions of the blending state in this element. */
+  public void setElt(boolean enabled,
+                     Vec4f blendColor,
+                     int srcFunc,
+                     int destFunc,
+                     int blendEquation) {
+    this.enabled = enabled;
+    this.blendColor.set(blendColor);
+    this.srcFunc = srcFunc;
+    this.destFunc = destFunc;
+    this.blendEquation = blendEquation;
+  }
+}