Merge branch 'master' of ssh://[email protected]/jogl~jogl-git

1 files changed, 157 insertions, 6 deletions

diff --git a/src/jogl/classes/javax/media/opengl/GLBase.java b/src/jogl/classes/javax/media/opengl/GLBase.java
index efd2eedd1..92498077b 100644
--- a/src/jogl/classes/javax/media/opengl/GLBase.java
+++ b/src/jogl/classes/javax/media/opengl/GLBase.java
@@ -7,9 +7,53 @@ package javax.media.opengl;
 import java.nio.*;
 
 /**
- * The base interface from which all GL profiles derive, providing
- * checked conversion down to concrete profiles, and access to the
- * OpenGL context associated with the GL.
+ * <P>The base interface from which all GL profiles derive, providing
+ * checked conversion down to concrete profiles, access to the
+ * OpenGL context associated with the GL and extension/function 
+ * availability queries as described below.</P>
+ *
+ * <P> While the APIs for vendor extensions are unconditionally
+ * exposed, the underlying functions may not be present. The method
+ * {@link #isFunctionAvailable} should be used to query the
+ * availability of any non-core function before it is used for the
+ * first time; for example,
+ * <code>gl.isFunctionAvailable("glProgramStringARB")</code>. On
+ * certain platforms (Windows in particular), the most "core"
+ * functionality is only OpenGL 1.1, so in theory any routines first
+ * exposed in OpenGL 1.2, 1.3, and 1.4, 1.5, or 2.0 as well as vendor
+ * extensions should all be queried. Calling an unavailable function
+ * will cause a {@link GLException} to be raised. </P>
+ *
+ * {@link #isExtensionAvailable} may also be used to determine whether
+ * a specific extension is available before calling the routines or
+ * using the functionality it exposes: for example,
+ * <code>gl.isExtensionAvailable("GL_ARB_vertex_program");</code>.
+ * However, in this case it is up to the end user to know which
+ * routines or functionality are associated with which OpenGL
+ * extensions. It may also be used to test for the availability of a
+ * particular version of OpenGL: for example,
+ * <code>gl.isExtensionAvailable("GL_VERSION_1_5");</code>.
+ *
+ * <P> Exceptions to the window system extension naming rules:
+ *
+ * <UL>
+ *
+ * <LI> The memory allocators for the NVidia vertex_array_range (VAR)
+ * extension, in particular <code>wglAllocateMemoryNV</code> /
+ * <code>glXAllocateMemoryNV</code> and associated routines. {@link
+ * #glAllocateMemoryNV} has been provided for window system-independent
+ * access to VAR. {@link #isFunctionAvailable} will translate an argument
+ * of "glAllocateMemoryNV" or "glFreeMemoryNV" into the appropriate
+ * window system-specific name. </P>
+ *
+ * <LI> WGL_ARB_pbuffer, WGL_ARB_pixel_format, and other
+ * platform-specific pbuffer functionality; the availability of
+ * pbuffers can be queried on Windows, X11 and Mac OS X platforms by
+ * querying {@link #isExtensionAvailable} with an argument of
+ * "GL_ARB_pbuffer" or "GL_ARB_pixel_format".
+ *
+ * </UL> <P>
+ *
  */
 public interface GLBase {
     
@@ -63,6 +107,12 @@ public interface GLBase {
    */
   public boolean isGL2ES2();
 
+  /**
+   * Indicates whether this GL object conforms to the GL2GL3 compatible profile.
+   * @return whether this GL object conforms to the GL2GL3 profile
+   */
+  public boolean isGL2GL3();
+
   /** Indicates whether this GL object supports GLSL. */
   public boolean hasGLSL();
 
@@ -116,14 +166,115 @@ public interface GLBase {
   public GL2ES2 getGL2ES2() throws GLException;
 
   /**
-   * Returns the GLContext with which this GL object is associated.
-   * @return the GLContext with which this GL object is associated
+   * Casts this object to the GL2GL3 interface.
+   * @return this object cast to the GL2GL3 interface
+   * @throws GLException if this GLObject is not a GL2GL3 implementation
    */
-  public GLContext getContext();
+  public GL2GL3 getGL2GL3() throws GLException;
 
   /**
    * Returns the GLProfile with which this GL object is associated.
    * @return the GLProfile with which this GL object is associated
    */
   public GLProfile getGLProfile();
+
+  /**
+   * Returns the GLContext with which this GL object is associated.
+   * @return the GLContext with which this GL object is associated
+   */
+  public GLContext getContext();
+
+   /**
+    * Returns true if the specified OpenGL core- or extension-function can be
+    * used successfully through this GL instance given the current host (OpenGL
+    * <i>client</i>) and display (OpenGL <i>server</i>) configuration.<P> 
+    * By "successfully" we mean that the function is both <i>callable</i> 
+    * on the machine running the program and <i>available</i> on the current 
+    * display.<P> 
+    *
+    * In order to call a function successfully, the function must be both
+    * <i>callable</i> on the machine running the program and <i>available</i> on 
+    * the display device that is rendering the output (note: on non-networked, 
+    * single-display machines these two conditions are identical; on networked and/or
+    * multi-display machines this becomes more complicated). These conditions are
+    * met if the function is either part of the core OpenGL version supported by
+    * both the host and display, or it is an OpenGL extension function that both
+    * the host and display support. <P>
+    *
+    * A GL function is <i>callable</i> if it is successfully linked at runtime,
+    * hence the GLContext must be made current at least once.
+    * 
+    * @param glFunctionName the name of the OpenGL function (e.g., use
+    * "glBindRenderbufferEXT" or "glBindRenderbuffer" to check if {@link
+    * #glBindRenderbuffer(int,int)} is available).
+    */
+   public boolean isFunctionAvailable(String glFunctionName);
+
+   /**
+    * Returns true if the specified OpenGL extension can be
+    * used successfully through this GL instance given the current host (OpenGL
+    * <i>client</i>) and display (OpenGL <i>server</i>) configuration.<P> 
+    *
+    * @param glExtensionName the name of the OpenGL extension (e.g.,
+    * "GL_ARB_vertex_program").
+    */
+   public boolean isExtensionAvailable(String glExtensionName);
+
+   /** Provides a platform-independent way to specify the minimum swap
+       interval for buffer swaps. An argument of 0 disables
+       sync-to-vertical-refresh completely, while an argument of 1
+       causes the application to wait until the next vertical refresh
+       until swapping buffers. The default, which is platform-specific,
+       is usually either 0 or 1. This function is not guaranteed to
+       have an effect, and in particular only affects heavyweight
+       onscreen components.
+       
+       @see #getSwapInterval
+       @throws GLException if this context is not the current
+    */
+   public void setSwapInterval(int interval);
+
+   /** Provides a platform-independent way to get the swap
+       interval set by {@link #setSwapInterval}. <br>
+
+       If the interval is not set by {@link #setSwapInterval} yet, 
+       -1 is returned, indicating that the platforms default 
+       is being used.
+
+       @see #setSwapInterval
+     */
+   public int getSwapInterval();
+
+   /**
+    * Returns an object through which platform-specific OpenGL extensions
+    * (EGL, GLX, WGL, etc.) may be accessed. The data type of the returned
+    * object and its associated capabilities are undefined. Most
+    * applications will never need to call this method. It is highly
+    * recommended that any applications which do call this method perform
+    * all accesses on the returned object reflectively to guard
+    * themselves against changes to the implementation.
+    */
+   public Object getPlatformGLExtensions();
+
+   /**
+    * Returns an object providing access to the specified OpenGL
+    * extension. This is intended to provide a mechanism for vendors who
+    * wish to provide access to new OpenGL extensions without changing
+    * the public API of the core package. For example, a user may request
+    * access to extension "GL_VENDOR_foo" and receive back an object
+    * which implements a vendor-specified interface which can call the
+    * OpenGL extension functions corresponding to that extension. It is
+    * up to the vendor to specify both the extension name and Java API
+    * for accessing it, including which class or interface contains the
+    * functions.
+    *
+    * <P>
+    *
+    * Note: it is the intent to add new extensions as quickly as possible
+    * to the core GL API. Therefore it is unlikely that most vendors will
+    * use this extension mechanism, but it is being provided for
+    * completeness.
+    */
+   public Object getExtension(String extensionName);
 }
+