Java Bindings for OpenGL
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Java Binding for the OpenGL API is a JSR API specification (JSR 231) for the Java Platform, Standard Edition which allows to use OpenGL on the Java (software platform).[1] There is also Java Binding for the OpenGL ES API (JSR 239) for the Java Platform, Micro Edition.
Programming concepts
[edit]Core OpenGL API and GLU library calls are available from Java through a thin wrapper looking very much as the original OpenGL C API, Except GLU NURBS routines which are not exposed through the public API.
All platform specific libraries (available from the CGL API for Mac OS X, GLX for X Window System, and WGL for Microsoft Windows) are also abstracted out to create a platform independent way of selecting Framebuffer attributes and performing platform specific Framebuffer operations.
Platform-specific extensions are not included in the public API. Each implementation can choose to export some of these APIs via the GL.getPlatformGLExtensions() Archived 2011-02-17 at the Wayback Machine and GL.getExtension(String) Archived 2011-02-17 at the Wayback Machine method calls which return Objects whose data types are specific to the given implementation.
Example
[edit]This example shows how to draw a polygon (without initialization or repaint code).[2] Here is the reference C implementation:
int DrawGLScene(GLvoid) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f, 0.0f, -6.0f); // Move Left 1.5 Units
glBegin(GL_TRIANGLES); //Drawing Using Triangles
glVertex3f( 0.0f, 1.0f, 0.0f); // Top
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glEnd();
glTranslatef(3.0f, 0.0f, 0.0f);
glBegin(GL_QUADS); // Draw A Quad
glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd();
glFlush();
return TRUE;
}
Which translates to the following Java implementation:
public void display(GLAutoDrawable glDrawable) {
final GL gl = glDrawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
gl.glTranslatef(-1.5f, 0.0f, -6.0f); // Move Left 1.5 Units
gl.glBegin(GL.GL_TRIANGLES); // Drawing Using Triangles
gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top
gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
gl.glEnd();
gl.glTranslatef(3.0f, 0.0f, 0.0f);
gl.glBegin(GL.GL_QUADS); // Draw A Quad
gl.glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
gl.glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
gl.glEnd();
gl.glFlush();
}
Implementations
[edit]- Java OpenGL : The reference implementation, available on Microsoft Windows, Linux, Mac OS X, and Solaris platforms.[3]
See also
[edit]References
[edit]- ^ "JSR 231: JavaBinding for the OpenGL API". Java Community Process. Retrieved 2011-02-06.
- ^ Borrowed from the Nehe tutorial Archived 2007-04-06 at the Wayback Machine, whose code is free to use elsewhere.
- ^ "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.