Java Bindings for OpenGL: Difference between revisions

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'''Java Binding for the OpenGL API''' is a [[Java Community Process|JSR]] [[API]] specification for the [[Java SE]] platform which allows to use [[OpenGL]] on the [[Java Platform]].

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'''Java Binding for the OpenGL API''' is a [[Java Community Process|JSR]] [[API]] specification (JSR 231) for the [[Java SEPlatform, Standard Edition]] platform which allows to use [[OpenGL]] on the [[Java Platform(software platform)]].<ref>{{cite web

| url=http://jcp.org/en/jsr/detail?id=231

| title=JSR 231: JavaBinding for the OpenGL API

| publisher=[[Java Community Process]]

| accessdate=February 6, 2011}}</ref> There is also '''Java Binding for the OpenGL ES API''' (JSR 239) for the [[Java Platform, Micro Edition]].

== Programming concepts ==

Core OpenGL API and [[OpenGL Utility Library|GLU]] library calls are available from [[Java (programming language)|Java]] through a thin wrapper looking very much as the original OpenGL [[C (programming language)|C]] API, Except GLU [[Nonuniform rational B-spline|NURBS]] routines which are not exposed through the public API.

All platform specific libraries (available from the [[AppleCore GLOpenGL|AGLCGL]] API for [[Mac OS X]], [[GLX]] for [[X Window System]], and [[WiggleWin32WGL (software)|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 [http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/javax/media/opengl/GLBase.html#getPlatformGLExtensions%28%29 GL.getPlatformGLExtensions()] {{Webarchive|url=https://web.archive.org/web/20110217002436/http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/javax/media/opengl/GLBase.html#getPlatformGLExtensions%28%29 |date=February 17, 2011 }} and [http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/javax/media/opengl/GLBase.html#getExtension%28java.lang.String%29 GL.getExtension(String)] {{Webarchive|url=https://web.archive.org/web/20110217002436/http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/javax/media/opengl/GLBase.html#getExtension%28java.lang.String%29 |date=February 17, 2011 }} method calls which return Objects whose data types are specific to the given implementation.

==Example==

This examplesexample shows how to draw a Polygonpolygon (without initialization or repaint code) .<ref>Borrowed from the [http://nehe.gamedev.net/lesson.asp?index=01 Nehe tutorial] {{Webarchive|url=https://web.archive.org/web/20070406193934/http://nehe.gamedev.net/lesson.asp?index=01 |date=April 6, which2007 }}, whose code areis free to use elsewhere.</ref>. Here is the reference [[C (programming language)|C]] implementation :

<syntaxhighlight lang="c">

<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

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

Line 19 ⟶ 27:

glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right

glEnd();

glTranslatef(3.0f, 0.0f, 0.0f);

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;

}

</syntaxhighlight>

Which translates to the following [[Java (programming language)|Java]] implementation :

<syntaxhighlight lang="java">

<pre>

public void display(GLAutoDrawable gLDrawableglDrawable) {

final GL gl = gLDrawableglDrawable.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();

}

</syntaxhighlight>

</pre>

== Implementations ==

*[[Java OpenGL]] : The reference implementation, available on [[Microsoft Windows]], [[Linux]], [[Mac OS X]], and [[Solaris (operating system)|Solaris]] platforms.<ref>{{cite web

| url=http://jcp.org/aboutJava/communityprocess/final/jsr231/index.html

| title=JSR-000231 Java Bindings for the OpenGL API

== References ==

| publisher=[[Java Community Process]]

<References/>

| quote=''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 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.''

| accessdate=February 6, 2011}}</ref>

== See also ==

*[[OpenGL]]

*[[Java Community Process]]

== References ==

{{Reflist}}

== External links ==

* [http://www.jcp.org/en/jsr/detail?id=231 JSR web page for Java Binding for the OpenGL API]

* [http://www.jcp.org/en/jsr/detail?id=239 JSR web page for Java Binding for the OpenGL ES API]

* [httpshttp://jogljogamp.dev.java.netorg/ JOGL home page]

* [http://downloadjogamp.java.netorg/mediadeployment/jogljogamp-next/buildsjavadoc/nightlyjogl/javadoc_publicjavadoc/overview-summary.html JSR 231 Specification (draft)]

{{Java desktop}}

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