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 * Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.java2d.opengl;

import java.awt.BufferCapabilities;
import static java.awt.BufferCapabilities.FlipContents.*;
import java.awt.Component;
import java.awt.GraphicsConfiguration;
import java.awt.Transparency;
import java.awt.image.ColorModel;

import sun.awt.AWTAccessor;
import sun.awt.AWTAccessor.ComponentAccessor;
import sun.awt.image.SunVolatileImage;
import sun.awt.image.VolatileSurfaceManager;
import sun.awt.windows.WComponentPeer;
import sun.java2d.SurfaceData;
import static sun.java2d.opengl.OGLContext.OGLContextCaps.*;
import static sun.java2d.pipe.hw.AccelSurface.*;
import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.*;

public class WGLVolatileSurfaceManager extends VolatileSurfaceManager {

    private final boolean accelerationEnabled;

    public WGLVolatileSurfaceManager(SunVolatileImage vImg, Object context) {
        super(vImg, context);

        /*
         * We will attempt to accelerate this image only under the
         * following conditions:
         *   - the image is not bitmask AND the GraphicsConfig supports the FBO
         *     extension
         */
        int transparency = vImg.getTransparency();
        WGLGraphicsConfig gc = (WGLGraphicsConfig) vImg.getGraphicsConfig();
        accelerationEnabled = gc.isCapPresent(CAPS_EXT_FBOBJECT)
                && transparency != Transparency.BITMASK;
    }

    protected boolean isAccelerationEnabled() {
        return accelerationEnabled;
    }

    
Create a FBO-based SurfaceData object (or init the backbuffer of an existing window if this is a double buffered GraphicsConfig).
/** * Create a FBO-based SurfaceData object (or init the backbuffer * of an existing window if this is a double buffered GraphicsConfig). */
protected SurfaceData initAcceleratedSurface() { SurfaceData sData; Component comp = vImg.getComponent(); final ComponentAccessor acc = AWTAccessor.getComponentAccessor(); WComponentPeer peer = (comp != null) ? acc.getPeer(comp) : null; try { boolean createVSynced = false; boolean forceback = false; if (context instanceof Boolean) { forceback = ((Boolean)context).booleanValue(); if (forceback) { BufferCapabilities caps = peer.getBackBufferCaps(); if (caps instanceof ExtendedBufferCapabilities) { ExtendedBufferCapabilities ebc = (ExtendedBufferCapabilities)caps; if (ebc.getVSync() == VSYNC_ON && ebc.getFlipContents() == COPIED) { createVSynced = true; forceback = false; } } } } if (forceback) { // peer must be non-null in this case sData = WGLSurfaceData.createData(peer, vImg, FLIP_BACKBUFFER); } else { WGLGraphicsConfig gc = (WGLGraphicsConfig)vImg.getGraphicsConfig(); ColorModel cm = gc.getColorModel(vImg.getTransparency()); int type = vImg.getForcedAccelSurfaceType(); // if acceleration type is forced (type != UNDEFINED) then // use the forced type, otherwise choose FBOBJECT if (type == OGLSurfaceData.UNDEFINED) { type = OGLSurfaceData.FBOBJECT; } if (createVSynced) { sData = WGLSurfaceData.createData(peer, vImg, type); } else { sData = WGLSurfaceData.createData(gc, vImg.getWidth(), vImg.getHeight(), cm, vImg, type); } } } catch (NullPointerException ex) { sData = null; } catch (OutOfMemoryError er) { sData = null; } return sData; } @Override protected boolean isConfigValid(GraphicsConfiguration gc) { return ((gc == null) || ((gc instanceof WGLGraphicsConfig) && (gc == vImg.getGraphicsConfig()))); } @Override public void initContents() { if (vImg.getForcedAccelSurfaceType() != OGLSurfaceData.TEXTURE) { super.initContents(); } } }