diff options
Diffstat (limited to 'src/jogl/classes/javax/media/opengl/GLBase.java')
| -rw-r--r-- | src/jogl/classes/javax/media/opengl/GLBase.java | 163 |
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); } + |