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 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.
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) [1]. 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();
return TRUE;
}
Which translates to the following [[Java (programming language)|Java]] implementation :
<pre>
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
- ^ Borrowed from Nehe tutorial, which code are free to use elsewhere