Java Bindings for OpenGL: Difference between revisions

Revision as of 09:55, 15 April 2007

Revision as of 11:45, 15 April 2007

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All platform specific libraries (available from the [[Apple GL|AGL]] API for [[Mac OS X]], [[GLX]] for [[X Window System]], and [[WiggleWin32|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<ref>Borrowed from [http://nehe.gamedev.net/lesson.asp?index=01 Nehe tutorial], which are free to use elsewhere</ref>). Here is the reference [[C (programming language)|C]] implementation :

<pre>

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();

}

</pre>

== Implementations ==