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/*
* 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 volatile 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 clearStates(boolean enable) {
enabled = enable;
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) {
Integer value = (Integer) pixelStateMap.get(key);
if(null!=value) {
params[params_offset] = value.intValue();
} else {
GLException re = new GLException("Key (0x"+Integer.toHexString(key.intValue())+") is not mapped");
throw re;
}
return true;
}
}
return false;
}
public boolean getInt(int pname, java.nio.IntBuffer params, int dummy) {
if(enabled) {
Integer key = boxKey(pname);
if(null!=key) {
Integer value = (Integer) pixelStateMap.get(key);
if(null!=value) {
params.put(params.position(), value.intValue());
} else {
GLException re = new GLException("Key (0x"+Integer.toHexString(key.intValue())+") is not mapped");
throw re;
}
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&GL2.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()+")");
}
Map/*<Integer,Integer>*/ pixelStateMapNew = new HashMap/*<Integer,Integer>*/();
if ( null != state.getPixelStateMap() ) {
pixelStateMapNew.putAll(state.getPixelStateMap());
}
pixelStateMap = pixelStateMapNew;
}
}
private static final Integer GL_PACK_SWAP_BYTES = new Integer(GL2GL3.GL_PACK_SWAP_BYTES);
private static final Integer GL_PACK_LSB_FIRST = new Integer(GL2GL3.GL_PACK_LSB_FIRST);
private static final Integer GL_PACK_ROW_LENGTH = new Integer(GL2GL3.GL_PACK_ROW_LENGTH);
private static final Integer GL_PACK_SKIP_ROWS = new Integer(GL2GL3.GL_PACK_SKIP_ROWS);
private static final Integer GL_PACK_SKIP_PIXELS = new Integer(GL2GL3.GL_PACK_SKIP_PIXELS);
private static final Integer GL_PACK_ALIGNMENT = new Integer(GL.GL_PACK_ALIGNMENT);
private static final Integer GL_PACK_IMAGE_HEIGHT = new Integer(GL2GL3.GL_PACK_IMAGE_HEIGHT);
private static final Integer GL_PACK_SKIP_IMAGES = new Integer(GL2GL3.GL_PACK_SKIP_IMAGES);
private static final Integer GL_UNPACK_SWAP_BYTES = new Integer(GL2GL3.GL_UNPACK_SWAP_BYTES);
private static final Integer GL_UNPACK_LSB_FIRST = new Integer(GL2GL3.GL_UNPACK_LSB_FIRST);
private static final Integer GL_UNPACK_ROW_LENGTH = new Integer(GL2GL3.GL_UNPACK_ROW_LENGTH);
private static final Integer GL_UNPACK_SKIP_ROWS = new Integer(GL2GL3.GL_UNPACK_SKIP_ROWS);
private static final Integer GL_UNPACK_SKIP_PIXELS = new Integer(GL2GL3.GL_UNPACK_SKIP_PIXELS);
private static final Integer GL_UNPACK_ALIGNMENT = new Integer(GL.GL_UNPACK_ALIGNMENT);
private static final Integer GL_UNPACK_IMAGE_HEIGHT = new Integer(GL2GL3.GL_UNPACK_IMAGE_HEIGHT);
private static final Integer GL_UNPACK_SKIP_IMAGES = new Integer(GL2GL3.GL_UNPACK_SKIP_IMAGES);
private static final Integer zero = new Integer(0);
private static final Integer one = new Integer(1);
private static Integer boxKey(int key) {
switch (key) {
case 0: return zero;
case GL2GL3.GL_PACK_SWAP_BYTES: return GL_PACK_SWAP_BYTES;
case GL2GL3.GL_PACK_LSB_FIRST: return GL_PACK_LSB_FIRST;
case GL2GL3.GL_PACK_ROW_LENGTH: return GL_PACK_ROW_LENGTH;
case GL2GL3.GL_PACK_SKIP_ROWS: return GL_PACK_SKIP_ROWS;
case GL2GL3.GL_PACK_SKIP_PIXELS: return GL_PACK_SKIP_PIXELS;
case GL.GL_PACK_ALIGNMENT: return GL_PACK_ALIGNMENT;
case GL2GL3.GL_PACK_IMAGE_HEIGHT: return GL_PACK_IMAGE_HEIGHT;
case GL2GL3.GL_PACK_SKIP_IMAGES: return GL_PACK_SKIP_IMAGES;
case GL2GL3.GL_UNPACK_SWAP_BYTES: return GL_UNPACK_SWAP_BYTES;
case GL2GL3.GL_UNPACK_LSB_FIRST: return GL_UNPACK_LSB_FIRST;
case GL2GL3.GL_UNPACK_ROW_LENGTH: return GL_UNPACK_ROW_LENGTH;
case GL2GL3.GL_UNPACK_SKIP_ROWS: return GL_UNPACK_SKIP_ROWS;
case GL2GL3.GL_UNPACK_SKIP_PIXELS: return GL_UNPACK_SKIP_PIXELS;
case GL.GL_UNPACK_ALIGNMENT: return GL_UNPACK_ALIGNMENT;
case GL2GL3.GL_UNPACK_IMAGE_HEIGHT: return GL_UNPACK_IMAGE_HEIGHT;
case GL2GL3.GL_UNPACK_SKIP_IMAGES: return GL_UNPACK_SKIP_IMAGES;
default: return null;
}
}
public void resetStates() {
pixelStateMap.clear();
pixelStateMap.put(GL_PACK_SWAP_BYTES, zero /* GL_FALSE */);
pixelStateMap.put(GL_PACK_LSB_FIRST, zero /* GL_FALSE */);
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_ALIGNMENT, new Integer(4));
pixelStateMap.put(GL_PACK_IMAGE_HEIGHT, zero);
pixelStateMap.put(GL_PACK_SKIP_IMAGES, zero);
pixelStateMap.put(GL_UNPACK_SWAP_BYTES, zero /* GL_FALSE */);
pixelStateMap.put(GL_UNPACK_LSB_FIRST, zero /* GL_FALSE */);
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_ALIGNMENT, new Integer(4));
pixelStateMap.put(GL_UNPACK_IMAGE_HEIGHT, zero);
pixelStateMap.put(GL_UNPACK_SKIP_IMAGES, zero);
}
private static Integer boxInt(int value) {
switch (value) {
case 0: return zero;
case 1: return one;
default: return new Integer(value);
}
}
}
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