Java Bindings for OpenGL
Java Binding for the OpenGL API is a JSR API specification for the Java SE platform which allows to use OpenGL [1] on the Java Platform.
Programming concepts
Core OpenGL API and GLU library calls are available from Java through a thin wrapper looking very much as the original OpenGL C API [2].
All platform specific libraries (available from the AGL 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.
Example
This examples shows how to draw a Polygon (without initialization or repaint code) [3]. 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();
gl.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); 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
- Java OpenGL : The reference implementation, available on Microsoft Windows, Linux, Mac OS X, and Solaris platforms.
References
- ^ All functions in core OpenGL 2.0 have been included.
- ^ Except GLU NURBS routines which are not exposed through the public API.
- ^ Borrowed from Nehe tutorial, which code are free to use elsewhere