1 files changed, 211 insertions, 0 deletions
diff --git a/src/jogl/classes/com/sun/opengl/impl/GLStateTracker.java b/src/jogl/classes/com/sun/opengl/impl/GLStateTracker.java
new file mode 100755
index 000000000..997951faf
--- /dev/null
+++ b/src/jogl/classes/com/sun/opengl/impl/GLStateTracker.java
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2006 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.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.opengl.impl;
+
+import java.util.*;
+import javax.media.opengl.*;
+
+/**
+ * Tracks as closely as possible OpenGL states.
+ * GLStateTracker objects are allocated on a per-OpenGL-context basis.
+ * <p>
+ * Currently supported states: PixelStorei
+ */
+
+public class GLStateTracker {
+  private static final boolean DEBUG = Debug.debug("GLStateTracker");
+
+  private static final Integer GL_PACK_ALIGNMENT    = new Integer(GL.GL_PACK_ALIGNMENT);
+  private static final Integer GL_PACK_ROW_LENGTH   = new Integer(GL2.GL_PACK_ROW_LENGTH);
+  private static final Integer GL_PACK_SKIP_ROWS    = new Integer(GL2.GL_PACK_SKIP_ROWS);
+  private static final Integer GL_PACK_SKIP_PIXELS  = new Integer(GL2.GL_PACK_SKIP_PIXELS);
+  private static final Integer GL_PACK_IMAGE_HEIGHT = new Integer(GL2.GL_PACK_IMAGE_HEIGHT);
+  private static final Integer GL_PACK_SKIP_IMAGES  = new Integer(GL2.GL_PACK_SKIP_IMAGES);
+
+  private static final Integer GL_UNPACK_ALIGNMENT    = new Integer(GL.GL_UNPACK_ALIGNMENT);
+  private static final Integer GL_UNPACK_ROW_LENGTH   = new Integer(GL2.GL_UNPACK_ROW_LENGTH);
+  private static final Integer GL_UNPACK_SKIP_ROWS    = new Integer(GL2.GL_UNPACK_SKIP_ROWS);
+  private static final Integer GL_UNPACK_SKIP_PIXELS  = new Integer(GL2.GL_UNPACK_SKIP_PIXELS);
+  private static final Integer GL_UNPACK_IMAGE_HEIGHT = new Integer(GL2.GL_UNPACK_IMAGE_HEIGHT);
+  private static final Integer GL_UNPACK_SKIP_IMAGES  = new Integer(GL2.GL_UNPACK_SKIP_IMAGES);
+
+  private static final Integer zero                   = new Integer(0);
+
+  private boolean enabled = true;
+
+  private Map/*<Integer,Integer>*/ pixelStateMap = new HashMap/*<Integer,Integer>*/();
+
+  static class SavedState {
+    SavedState() {
+        this.pixelStateMap = null;
+    }
+    void putPixelStateMap(Map pixelStateMap) {
+        this.pixelStateMap = new HashMap();
+        this.pixelStateMap.putAll(pixelStateMap);
+    }
+    Map getPixelStateMap() { return pixelStateMap; }
+
+    private Map pixelStateMap;
+    // private Map otherStateMap;
+  }
+  private List/*<SavedState>*/ stack = new ArrayList();
+
+  public GLStateTracker() {
+    resetStates();
+  }
+
+  public void resetStates() {
+    pixelStateMap.clear();
+
+    pixelStateMap.put(GL_PACK_ALIGNMENT,    new Integer(4));
+    pixelStateMap.put(GL_PACK_ROW_LENGTH,   zero);
+    pixelStateMap.put(GL_PACK_SKIP_ROWS,    zero);
+    pixelStateMap.put(GL_PACK_SKIP_PIXELS,  zero);
+    pixelStateMap.put(GL_PACK_IMAGE_HEIGHT, zero);
+    pixelStateMap.put(GL_PACK_SKIP_IMAGES,  zero);
+
+    pixelStateMap.put(GL_UNPACK_ALIGNMENT,    new Integer(4));
+    pixelStateMap.put(GL_UNPACK_ROW_LENGTH,   zero);
+    pixelStateMap.put(GL_UNPACK_SKIP_ROWS,    zero);
+    pixelStateMap.put(GL_UNPACK_SKIP_PIXELS,  zero);
+    pixelStateMap.put(GL_UNPACK_IMAGE_HEIGHT, zero);
+    pixelStateMap.put(GL_UNPACK_SKIP_IMAGES,  zero);
+  }
+
+  public void clearStates() {
+    pixelStateMap.clear();
+  }
+
+  public void setEnabled(boolean on) {
+    enabled = on;    
+  }
+
+  public boolean isEnabled() {
+    return enabled;
+  }
+
+  public boolean getInt(int pname, int[] params, int params_offset) {
+    if(enabled) {
+        Integer key = boxKey(pname);
+        if(null!=key) {
+            params[params_offset] = ((Integer) pixelStateMap.get(key)).intValue();
+            return true;
+        }
+    }
+    return false;
+  }
+
+  public boolean getInt(int pname, java.nio.IntBuffer params, int dummy) {
+    if(enabled) {
+        Integer key = boxKey(pname);
+        if(null!=key) {
+            params.put(params.position(), ((Integer) pixelStateMap.get(key)).intValue());
+            return true;
+        }
+    }
+    return false;
+  }
+
+  public void setInt(int pname, int param) {
+    if(enabled) {
+        Integer key = boxKey(pname);
+        if(null!=key) {
+            pixelStateMap.put(key, boxInt(param));
+        }
+    }
+  }
+
+  public void pushAttrib(int flags) {
+    if(enabled) {
+        SavedState state = new SavedState();
+        if( 0 != (flags&GL_CLIENT_PIXEL_STORE_BIT) ) {
+            state.putPixelStateMap(pixelStateMap);
+        }
+        stack.add(0, state);
+    }
+  }
+
+  public void popAttrib() {
+    if(enabled) {
+        if(stack.size()==0) {
+            throw new GLException("stack contains no elements");
+        }
+        SavedState state = (SavedState) stack.remove(0);
+        if(null==state) {
+            throw new GLException("null stack element (remaining stack size "+stack.size()+")");
+        }
+
+        clearStates();
+
+        if ( null != state.getPixelStateMap() ) {
+            pixelStateMap.putAll(state.getPixelStateMap());
+        }
+    }
+  }
+
+  private static Integer boxKey(int key) {
+    switch (key) {
+      case 0:                          return zero;
+      case GL.GL_PACK_ALIGNMENT:       return GL_PACK_ALIGNMENT;
+      case GL2.GL_PACK_ROW_LENGTH:     return GL_PACK_ROW_LENGTH;
+      case GL2.GL_PACK_SKIP_ROWS:      return GL_PACK_SKIP_ROWS;
+      case GL2.GL_PACK_SKIP_PIXELS:    return GL_PACK_SKIP_PIXELS;
+      case GL2.GL_PACK_IMAGE_HEIGHT:   return GL_PACK_IMAGE_HEIGHT;
+      case GL2.GL_PACK_SKIP_IMAGES:    return GL_PACK_SKIP_IMAGES;
+
+      case GL.GL_UNPACK_ALIGNMENT:     return GL_UNPACK_ALIGNMENT;
+      case GL2.GL_UNPACK_ROW_LENGTH:   return GL_UNPACK_ROW_LENGTH;
+      case GL2.GL_UNPACK_SKIP_ROWS:    return GL_UNPACK_SKIP_ROWS;
+      case GL2.GL_UNPACK_SKIP_PIXELS:  return GL_UNPACK_SKIP_PIXELS;
+      case GL2.GL_UNPACK_IMAGE_HEIGHT: return GL_UNPACK_IMAGE_HEIGHT;
+      case GL2.GL_UNPACK_SKIP_IMAGES:  return GL_UNPACK_SKIP_IMAGES;
+
+      default: return null;
+    }
+  }
+
+  private static Integer boxInt(int value) {
+    switch (value) {
+      case 0:  return zero;
+
+      default: return new Integer(value);
+    }
+  }
+}