1 files changed, 133 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/windows/WindowsOffscreenGLDrawable.java b/src/classes/com/sun/opengl/impl/windows/WindowsOffscreenGLDrawable.java
new file mode 100644
index 000000000..7dd6d2361
--- /dev/null
+++ b/src/classes/com/sun/opengl/impl/windows/WindowsOffscreenGLDrawable.java
@@ -0,0 +1,133 @@
+/*
+ * 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;
+
+import javax.media.opengl.*;
+import com.sun.opengl.impl.*;
+
+public class WindowsOffscreenGLDrawable extends WindowsGLDrawable {
+  private long origbitmap;
+  private long hbitmap;
+  // Width and height of the underlying bitmap
+  private int  width;
+  private int  height;
+
+  public WindowsOffscreenGLDrawable(GLCapabilities capabilities,
+                                    GLCapabilitiesChooser chooser) {
+    super(null, capabilities, chooser);
+  }
+
+  public GLContext createContext(GLContext shareWith) {
+    return new WindowsOffscreenGLContext(this, shareWith);
+  }
+
+  public void setSize(int newWidth, int newHeight) {
+    width = newWidth;
+    height = newHeight;
+    if (hdc != 0) {
+      destroy();
+    }
+    create();
+  }
+
+  public int getWidth() {
+    return width;
+  }
+
+  public int getHeight() {
+    return height;
+  }
+  
+  private void create() {
+    BITMAPINFO info = new BITMAPINFO();
+    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);
+
+    hdc = WGL.CreateCompatibleDC(0);
+    if (hdc == 0) {
+      System.out.println("LastError: " + WGL.GetLastError());
+      throw new GLException("Error creating device context for offscreen OpenGL context");
+    }
+    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() {
+    if (hdc != 0) {
+      // Must destroy bitmap and device context
+      WGL.SelectObject(hdc, origbitmap);
+      WGL.DeleteObject(hbitmap);
+      WGL.DeleteDC(hdc);
+      origbitmap = 0;
+      hbitmap = 0;
+      hdc = 0;
+    }
+  }
+}