Initial checkin of the Minimal Scene Graph (MSG) library, intentended

for experimentation with both 3D and 2D/3D interaction.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/joglutils/trunk@44 83d24430-9974-4f80-8418-2cc3294053b9

1 files changed, 104 insertions, 0 deletions

diff --git a/src/net/java/joglutils/msg/elements/GLTextureCoordinateElement.java b/src/net/java/joglutils/msg/elements/GLTextureCoordinateElement.java
new file mode 100644
index 0000000..111d0a9
--- /dev/null
+++ b/src/net/java/joglutils/msg/elements/GLTextureCoordinateElement.java
@@ -0,0 +1,104 @@
+/*
+ * 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 javax.media.opengl.glu.*;
+
+import net.java.joglutils.msg.misc.*;
+
+/** Represents the current set of texture coordinates, which are
+    applied on a per-vertex basis to any drawn geometry, and performs
+    side-effects in OpenGL. */
+
+public class GLTextureCoordinateElement extends TextureCoordinateElement {
+  // Boilerplate for concrete element subclasses
+  public Element newInstance() {
+    return new GLTextureCoordinateElement();
+  }
+  public static GLTextureCoordinateElement getInstance(State state) {
+    return (GLTextureCoordinateElement) TextureCoordinateElement.getInstance(state);
+  }
+  public static void enable(State defaultState) {
+    Element tmp = new GLTextureCoordinateElement();
+    defaultState.setElement(tmp.getStateIndex(), tmp);
+  }
+
+  // Whether the OpenGL state is currently enabled
+  private boolean enabled;
+
+  public void push(State state) {
+    super.push(state);
+    // Copy enabled state from previous element if any
+    GLTextureCoordinateElement prev = (GLTextureCoordinateElement) getNextInStack();
+    if (prev != null) {
+      enabled = prev.enabled;
+    }
+  }
+
+  public void pop(State state, Element previousTopElement) {
+    GLTextureCoordinateElement prev = (GLTextureCoordinateElement) previousTopElement;
+    boolean shouldBeEnabled = enabled;
+    enabled = prev.enabled;
+    // Put things back the way they were
+    setEnabled(shouldBeEnabled);
+  }
+
+  public void setElt(FloatBuffer coords) {
+    super.setElt(coords);
+    setEnabled(coords != null);
+  }
+
+  private void setEnabled(boolean enabled) {
+    if (this.enabled == enabled)
+      return;  // No OpenGL work to do
+    this.enabled = enabled;
+    GL gl = GLU.getCurrentGL();
+    if (enabled) {
+      // FIXME: may want to link this up with the GLTextureElement so
+      // that we only enable the texture coordinate array if we both
+      // have a TextureCoordinateElement and a TextureElement active
+      // (a little error checking for the application)
+      gl.glTexCoordPointer(2, GL.GL_FLOAT, 0, coords);
+      gl.glEnableClientState(GL.GL_TEXTURE_COORD_ARRAY);
+    } else {
+      gl.glDisableClientState(GL.GL_TEXTURE_COORD_ARRAY);
+    }
+  }
+}