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/*
* Copyright (c) 2003 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.windows.wgl;
import javax.media.opengl.*;
import com.sun.opengl.impl.*;
public class WindowsOffscreenWGLDrawable extends WindowsWGLDrawable {
private long origbitmap;
private long hbitmap;
public WindowsOffscreenWGLDrawable(GLDrawableFactory factory,
GLCapabilities requestedCapabilities,
GLCapabilitiesChooser chooser,
int width,
int height) {
super(factory, new NullWindow(), true, requestedCapabilities, chooser);
((NullWindow) getNativeWindow()).setSize(width, height);
create();
}
public GLContext createContext(GLContext shareWith) {
return new WindowsOffscreenWGLContext(this, shareWith);
}
private void create() {
NullWindow nw = (NullWindow) getNativeWindow();
GLCapabilities capabilities = getRequestedGLCapabilities();
int width = getWidth();
int height = getHeight();
BITMAPINFO info = BITMAPINFO.create();
BITMAPINFOHEADER header = info.bmiHeader();
int bitsPerPixel = (capabilities.getRedBits() +
capabilities.getGreenBits() +
capabilities.getBlueBits());
header.biSize(header.size());
header.biWidth(width);
// NOTE: negating the height causes the DIB to be in top-down row
// order rather than bottom-up; ends up being correct during pixel
// readback
header.biHeight(-1 * height);
header.biPlanes((short) 1);
header.biBitCount((short) bitsPerPixel);
header.biXPelsPerMeter(0);
header.biYPelsPerMeter(0);
header.biClrUsed(0);
header.biClrImportant(0);
header.biCompression(WGL.BI_RGB);
header.biSizeImage(width * height * bitsPerPixel / 8);
long hdc = WGL.CreateCompatibleDC(0);
if (hdc == 0) {
System.out.println("LastError: " + WGL.GetLastError());
throw new GLException("Error creating device context for offscreen OpenGL context");
}
nw.setSurfaceHandle(hdc);
hbitmap = WGL.CreateDIBSection(hdc, info, WGL.DIB_RGB_COLORS, 0, 0, 0);
if (hbitmap == 0) {
WGL.DeleteDC(hdc);
hdc = 0;
throw new GLException("Error creating offscreen bitmap of width " + width +
", height " + height);
}
if ((origbitmap = WGL.SelectObject(hdc, hbitmap)) == 0) {
WGL.DeleteObject(hbitmap);
hbitmap = 0;
WGL.DeleteDC(hdc);
hdc = 0;
throw new GLException("Error selecting bitmap into new device context");
}
choosePixelFormat(false);
}
public void destroy() {
NullWindow nw = (NullWindow) getNativeWindow();
if (nw.getSurfaceHandle() != 0) {
// Must destroy bitmap and device context
WGL.SelectObject(nw.getSurfaceHandle(), origbitmap);
WGL.DeleteObject(hbitmap);
WGL.DeleteDC(nw.getSurfaceHandle());
origbitmap = 0;
hbitmap = 0;
nw.setSurfaceHandle(0);
setChosenGLCapabilities(null);
}
}
}
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