Java OpenGL

JOGL

A demo screenshot illustrating real-time refraction using JOGL on Mac OS X
Developer(s) JogAmp Community
Stable release 2.3.2 / October 10, 2015 (2015-10-10)
Preview release 2.3.2 / October 10, 2015 (2015-10-10)
Written in Java, C
Operating system Cross-platform
Type 3D computer graphics software (library/API)
License BSD license
Website jogamp.org

Java OpenGL (JOGL) is a wrapper library that allows OpenGL to be used in the Java programming language.[1][2] It was originally developed by Kenneth Bradley Russell and Christopher John Kline, and was further developed by the Sun Microsystems Game Technology Group. Since 2010, it has been an independent open source project under a BSD license. It is the reference implementation for Java Bindings for OpenGL (JSR-231).

JOGL allows access to most OpenGL features available to C language programs through the use of the Java Native Interface (JNI). It offers access to both the standard GL* functions along with the GLU* functions; however the OpenGL Utility Toolkit (GLUT) library is not available for window-system related calls, as Java has its own windowing systems: Abstract Window Toolkit (AWT), Swing, and some extensions.

Design

The base OpenGL C API, as well as its associated Windowing API,[3] are accessed in JOGL via Java Native Interface (JNI) calls. As such, the underlying system must support OpenGL for JOGL to work.

JOGL differs from some other Java OpenGL wrapper libraries in that it merely exposes the procedural OpenGL API via methods on a few classes, rather than trying to map OpenGL functionality onto the object-oriented programming paradigm. Indeed, most of the JOGL code is autogenerated from the OpenGL C header files via a conversion tool named GlueGen, which was programmed specifically to facilitate the creation of JOGL.

This design decision has both its advantages and disadvantages. The procedural and state machine nature of OpenGL is inconsistent with the typical method of programming under Java, which is bothersome to many programmers. However, the straightforward mapping of the OpenGL C API to Java methods makes conversion of existing C applications and example code much simpler. The thin layer of abstraction provided by JOGL makes runtime execution quite efficient, but accordingly is more difficult to code compared to higher-level abstraction libraries like Java3D. Because most of the code is autogenerated, changes to OpenGL can be rapidly added to JOGL.

Status and standardization

As of 2015, JOGL provides full access to the OpenGL 4.5 specification as well as almost all vendor extensions (and OpenCL, OpenMAX and OpenAL).[4] The 1.1.0 version is the reference implementation for JSR-231 (Java Bindings for OpenGL).[5] The 1.1.1 release gave limited access to GLU NURBS, providing rendering of curved lines and surfaces via the traditional GLU APIs. The 2.3.2 release added support for OpenGL versions up to 4.5, and OpenGL ES versions up to 3.2.

Wayland and Vulkan support is planned.[6]

Java2D-OpenGL interoperability

Since the Java SE 6 version of the Java language, Java2D (the API for drawing two dimensional graphics in Java) and JOGL have become interoperable, allowing it to :

Tutorials

- OpenGL ES 2 sample

- GL3 and GL4 Hello Triangle and Hello Texture

- Java OpenGL Sample Pack, porting of g-truc OpenGL Sample Pack. The over 230 samples illustrate almost all OpenGL features ranging from ES 2.0 up to the last GL extenstions, same of them usually also called AZDO (Almost Zero Driver Overhead).

- Immediate mode sample (deprecated)

Codes examples

    @Override
    public void display(GLAutoDrawable drawable) {

        GL4 gl4 = drawable.getGL().getGL4();

        gl4.glClearBufferfv(GL_COLOR, 0, clearColor);
        gl4.glClearBufferfv(GL_DEPTH, 0, clearDepth);

        {
            FloatUtil.makeLookAt(view, 0, eye, 0, at, 0, up, 0, tmp);
            FloatUtil.makePerspective(projection, 0, reset, 45f, aspect, near, far);

            FloatUtil.multMatrix(projection, view); // projection *= view

            transformPointer.asFloatBuffer().put(projection);
        }

        gl4.glUseProgram(programName);
        gl4.glBindVertexArray(vertexArrayName.get(0));
        gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

        gl4.glBindTextureUnit(Semantic.Sampler.DIFFUSE, textureName.get(0));
        gl4.glBindSampler(Semantic.Sampler.DIFFUSE, samplerName.get(0));

        gl4.glDrawElements(GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0);
    }

See also

References

  1. ↑ "Open source Java projects: Java Binding for OpenGL (JOGL)". JavaWorld. 2008-09-18. Retrieved 2011-02-06. JOGL originated as a project named Jungle, which was created by 3D graphics experts Ken Russell (of Sun Microsystems) and Chris Kline (of Irrational Games).
  2. ↑ "Hello JOGL". JavaWorld. 2005-02-21. Retrieved 2011-02-06.
  3. ↑ "3D & Multimedia Across Platforms and Devices Using JOGL" (PDF). SIGGRAPH. 2010-07-27. Retrieved 2011-02-06.
  4. ↑ http://jogamp.org/jogl/www/
  5. ↑ "JSR-000231 Java Bindings for the OpenGL API". Java Community Process. Retrieved 2011-02-06. In order to facilitate maximum community participation for the Java Binding for the OpenGL API, we use the JOGL project on java.net found at https://jogl.dev.java.net. The JOGL source code can be found there, licensed under a liberal source code license (mostly licensed as BSD except where we use other parties' licensed code). We take a snapshot of the code from this project every few months, run the Technology Compatibility Kit on the source code, and then officially make it the Reference Implementation for each formal Java Binding for the OpenGL API release.
  6. ↑ "Bug 794 - Add Wayland Windowing/Surface Interoperability". 2013-08-05.
  7. ↑ http://jogamp.org/jogl/doc/userguide/#overview

External links

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