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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 jogamp.opengl;
import javax.media.opengl.*;
import com.jogamp.common.util.IntIntHashMap;
import java.nio.IntBuffer;
import java.util.ArrayList;
/**
* 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 {
/** Minimum value of MAX_CLIENT_ATTRIB_STACK_DEPTH */
public static final int MIN_CLIENT_ATTRIB_STACK_DEPTH = 16;
/** static size of pixel state map */
static final int PIXEL_STATE_MAP_SIZE = 16;
/** avoid rehash of static size pixel state map */
static final int PIXEL_STATE_MAP_CAPACITY = 32;
private volatile boolean enabled = true;
private IntIntHashMap pixelStateMap;
private final ArrayList<SavedState> stack;
private static class SavedState {
/**
* Empty pixel-store state
*/
private IntIntHashMap pixelStateMap;
/**
* set (client) pixel-store state, deep copy
*/
private final void setPixelStateMap(IntIntHashMap pixelStateMap) {
this.pixelStateMap = (IntIntHashMap) pixelStateMap.clone();
}
/**
* get (client) pixel-store state, return reference
*/
private final IntIntHashMap getPixelStateMap() { return pixelStateMap; }
}
public GLStateTracker() {
pixelStateMap = new IntIntHashMap(PIXEL_STATE_MAP_CAPACITY, 0.75f);
pixelStateMap.setKeyNotFoundValue(0xFFFFFFFF);
resetStates();
stack = new ArrayList<SavedState>(MIN_CLIENT_ATTRIB_STACK_DEPTH);
}
public final void clearStates() {
pixelStateMap.clear();
}
public final void setEnabled(boolean on) {
enabled = on;
}
public final boolean isEnabled() {
return enabled;
}
/** @return true if found in our map, otherwise false,
* which forces the caller to query GL. */
public final boolean getInt(int pname, int[] params, int params_offset) {
if(enabled) {
final int value = pixelStateMap.get(pname);
if(0xFFFFFFFF != value) {
params[params_offset] = value;
return true;
}
}
return false;
}
/** @return true if found in our map, otherwise false,
* which forces the caller to query GL. */
public final boolean getInt(int pname, IntBuffer params, int dummy) {
if(enabled) {
final int value = pixelStateMap.get(pname);
if(0xFFFFFFFF != value) {
params.put(params.position(), value);
return true;
}
}
return false;
}
public final void setInt(int pname, int param) {
if(enabled) {
pixelStateMap.put(pname, param);
}
}
public final void pushAttrib(int flags) {
if(enabled) {
SavedState state = new SavedState(); // empty-slot
if( 0 != (flags&GL2.GL_CLIENT_PIXEL_STORE_BIT) ) {
// save client pixel-store state
state.setPixelStateMap(pixelStateMap);
}
stack.add(stack.size(), state); // push
}
}
public final void popAttrib() {
if(enabled) {
if(stack.isEmpty()) {
throw new GLException("stack contains no elements");
}
SavedState state = stack.remove(stack.size()-1); // pop
if(null==state) {
throw new GLException("null stack element (remaining stack size "+stack.size()+")");
}
if ( null != state.getPixelStateMap() ) {
// use pulled client pixel-store state from stack
pixelStateMap = state.getPixelStateMap();
} // else: empty-slot, not pushed by GL_CLIENT_PIXEL_STORE_BIT
}
}
private final void resetStates() {
pixelStateMap.clear();
// 16 values -> PIXEL_STATE_MAP_SIZE
pixelStateMap.put(GL.GL_PACK_ALIGNMENT, 4);
pixelStateMap.put(GL2GL3.GL_PACK_SWAP_BYTES, GL.GL_FALSE);
pixelStateMap.put(GL2GL3.GL_PACK_LSB_FIRST, GL.GL_FALSE);
pixelStateMap.put(GL2GL3.GL_PACK_ROW_LENGTH, 0);
pixelStateMap.put(GL2GL3.GL_PACK_SKIP_ROWS, 0);
pixelStateMap.put(GL2GL3.GL_PACK_SKIP_PIXELS, 0);
pixelStateMap.put(GL2GL3.GL_PACK_IMAGE_HEIGHT, 0);
pixelStateMap.put(GL2GL3.GL_PACK_SKIP_IMAGES, 0);
pixelStateMap.put(GL.GL_UNPACK_ALIGNMENT, 4);
pixelStateMap.put(GL2GL3.GL_UNPACK_SWAP_BYTES, GL.GL_FALSE);
pixelStateMap.put(GL2GL3.GL_UNPACK_LSB_FIRST, GL.GL_FALSE);
pixelStateMap.put(GL2GL3.GL_UNPACK_ROW_LENGTH, 0);
pixelStateMap.put(GL2GL3.GL_UNPACK_SKIP_ROWS, 0);
pixelStateMap.put(GL2GL3.GL_UNPACK_SKIP_PIXELS, 0);
pixelStateMap.put(GL2GL3.GL_UNPACK_IMAGE_HEIGHT, 0);
pixelStateMap.put(GL2GL3.GL_UNPACK_SKIP_IMAGES, 0);
}
}
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