1 files changed, 81 insertions, 0 deletions
diff --git a/src/net/java/joglutils/msg/elements/GLViewingMatrixElement.java b/src/net/java/joglutils/msg/elements/GLViewingMatrixElement.java
new file mode 100644
index 0000000..5848413
--- /dev/null
+++ b/src/net/java/joglutils/msg/elements/GLViewingMatrixElement.java
@@ -0,0 +1,81 @@
+/*
+ * 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.math.*;
+import net.java.joglutils.msg.misc.*;
+
+/** Represents the viewing matrix, which contains the transformation
+    between the camera and the model, and performs side-effects in
+    OpenGL. */
+
+public class GLViewingMatrixElement extends ViewingMatrixElement {
+  // Boilerplate for concrete element subclasses
+  public Element newInstance() {
+    return new GLViewingMatrixElement();
+  }
+  public static GLViewingMatrixElement getInstance(State state) {
+    return (GLViewingMatrixElement) ViewingMatrixElement.getInstance(state);
+  }
+  public static void enable(State defaultState) {
+    Element tmp = new GLViewingMatrixElement();
+    defaultState.setElement(tmp.getStateIndex(), tmp);
+  }
+
+  // State which we need in order to reset the modelview matrix
+  private State state;
+  protected Mat4f temp = new Mat4f();
+
+  public void push(State state) {
+    super.push(state);
+    this.state = state;
+  }
+
+  public void setElt(Mat4f matrix) {
+    super.setElt(matrix);
+    // Must push the combined viewing and modelview matrices down to OpenGL
+    Mat4f mdl = ModelMatrixElement.getInstance(state).getMatrix();
+    temp.mul(matrix, mdl);
+    GL gl = GLU.getCurrentGL();
+    gl.glLoadTransposeMatrixf(temp.getRowMajorData(), 0);
+  }
+}