1 files changed, 155 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/windows/wgl/WindowsPbufferWGLContext.java b/src/classes/com/sun/opengl/impl/windows/wgl/WindowsPbufferWGLContext.java
new file mode 100644
index 000000000..7af3cbfc9
--- /dev/null
+++ b/src/classes/com/sun/opengl/impl/windows/wgl/WindowsPbufferWGLContext.java
@@ -0,0 +1,155 @@
+/*
+ * 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 WindowsPbufferWGLContext extends WindowsWGLContext {
+  private static final boolean DEBUG = Debug.debug("WindowsPbufferWGLContext");
+
+  // State for render-to-texture and render-to-texture-rectangle support
+  private WindowsPbufferWGLDrawable drawable;
+  private boolean rtt;       // render-to-texture?
+  private boolean hasRTT;    // render-to-texture extension available?
+  private boolean rect;      // render-to-texture-rectangle?
+  private int textureTarget; // e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_NV
+  private int texture;       // actual texture object
+
+  public WindowsPbufferWGLContext(WindowsPbufferWGLDrawable drawable,
+                                 GLContext shareWith) {
+    super(drawable, shareWith);
+    this.drawable = drawable;
+  }
+
+  public void bindPbufferToTexture() {
+    if (!rtt) {
+      throw new GLException("Shouldn't try to bind a pbuffer to a texture if render-to-texture hasn't been " +
+                            "specified in its GLCapabilities");
+    }
+    GL gl = getGL();
+    WGLExt wglExt = getWGLExt();
+    gl.glBindTexture(textureTarget, texture);
+    if (rtt && hasRTT) {
+      if (!wglExt.wglBindTexImageARB(drawable.getPbuffer(), WGLExt.WGL_FRONT_LEFT_ARB)) {
+        throw new GLException("Binding of pbuffer to texture failed: " + wglGetLastError());
+      }
+    }
+    // FIXME: comment is wrong now
+    // Note that if the render-to-texture extension is not supported,
+    // we perform a glCopyTexImage2D in swapBuffers().
+  }
+
+  public void releasePbufferFromTexture() {
+    if (!rtt) {
+      throw new GLException("Shouldn't try to bind a pbuffer to a texture if render-to-texture hasn't been " +
+                            "specified in its GLCapabilities");
+    }
+    if (rtt && hasRTT) {
+      WGLExt wglExt = getWGLExt();
+      if (!wglExt.wglReleaseTexImageARB(drawable.getPbuffer(), WGLExt.WGL_FRONT_LEFT_ARB)) {
+        throw new GLException("Releasing of pbuffer from texture failed: " + wglGetLastError());
+      }
+    }
+  }
+
+  protected int makeCurrentImpl() throws GLException {
+    int res = super.makeCurrentImpl();
+    if (DEBUG && VERBOSE) {
+      System.err.println("WindowsPbufferWGLContext: super.makeCurrentImpl() = " + res);
+    }
+    if (res == CONTEXT_CURRENT_NEW) {
+      GLCapabilities capabilities = drawable.getCapabilities();
+
+      // Initialize render-to-texture support if requested
+      GL gl = getGL();
+      rtt  = capabilities.getPbufferRenderToTexture();
+      rect = gl.isGL2() && capabilities.getPbufferRenderToTextureRectangle();
+
+      if (rtt) {
+        if (DEBUG) {
+          System.err.println("Initializing render-to-texture support");
+        }
+
+        if (!gl.isExtensionAvailable("WGL_ARB_render_texture")) {
+          System.err.println("WindowsPbufferWGLContext: WARNING: WGL_ARB_render_texture extension not " +
+                             "supported; implementing render_to_texture support using slow texture readback");
+        } else {
+          hasRTT = true;
+
+          if (rect && !gl.isExtensionAvailable("GL_NV_texture_rectangle")) {
+            System.err.println("WindowsPbufferWGLContext: WARNING: GL_NV_texture_rectangle extension not " +
+                               "supported; skipping requested render_to_texture_rectangle support for pbuffer");
+            rect = false;
+          }
+          if (rect) {
+            if (DEBUG) {
+              System.err.println("  Using render-to-texture-rectangle");
+            }
+            textureTarget = GL2.GL_TEXTURE_RECTANGLE_EXT;
+          } else {
+            if (DEBUG) {
+              System.err.println("  Using vanilla render-to-texture");
+            }
+            textureTarget = GL.GL_TEXTURE_2D;
+          }
+          int[] tmp = new int[1];
+          gl.glGenTextures(1, tmp, 0);
+          texture = tmp[0];
+          gl.glBindTexture(textureTarget, texture);
+          gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
+          gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
+          gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
+          gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
+          gl.glCopyTexImage2D(textureTarget, 0, GL.GL_RGB, 0, 0, drawable.getWidth(), drawable.getHeight(), 0);
+        }
+      }
+    }
+    return res;
+  }
+
+  public int getFloatingPointMode() {
+    return drawable.getFloatingPointMode();
+  }
+
+  private static String wglGetLastError() {
+    return WindowsWGLDrawableFactory.wglGetLastError();
+  }
+}