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<strong>Contents</strong><label for="contents">⊕</label>
<input type="checkbox" id="contents">
<ul>
<li><a href="#jogl-and-opengl-divergence">JOGL and OpenGL
Divergence</a>
<ul>
<li><a href="#overview">Overview</a>
<ul>
<li><a href="#opengl-debugging">OpenGL Debugging</a></li>
<li><a href="#retrieve-mapped-buffers-data">Retrieve Mapped Buffer's
Data</a></li>
</ul></li>
<li><a href="#references">References</a></li>
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<h1 id="jogl-and-opengl-divergence">JOGL and OpenGL Divergence</h1>
<h2 id="overview">Overview</h2>
<p>As described in <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/overview-summary.html#overview_description">mapping
of OpenGL profiles to interfaces</a>, JOGL is mostly API compatible with
the OpenGL API while packaging functionality in <a
href="https://jogamp.org/jogl/doc/uml/html/index-withframe.html">OpenGL
profiles</a>.</p>
<p>However, there are certain aspects where JOGL diverges due to managed
code aspects and the Java™ language.</p>
<h3 id="opengl-debugging">OpenGL Debugging</h3>
<p>In 2009-2012 the <a
href="https://www.khronos.org/opengl/wiki/Debug_Output">Debug Output</a>
extensions <a
href="http://www.opengl.org/registry/specs/AMD/debug_output.txt">AMD_debug_output</a>
and <a
href="https://registry.khronos.org/OpenGL/extensions/ARB/ARB_debug_output.txt">ARB_debug_output</a>
were created, subsumed to the core via <a
href="https://registry.khronos.org/OpenGL/extensions/KHR/KHR_debug.txt">KHR_debug</a>.</p>
<p>They allow applications to <a
href="https://docs.gl/gl4/glDebugMessageCallback">enable and control
low-level debugging</a> using the OpenGL implementation.</p>
<p>These extensions have been subsumed in <a
href="https://www.khronos.org/opengl/wiki/GLAPI/glDebugMessageCallback">OpenGL
4.3</a> and in <a
href="https://registry.khronos.org/OpenGL-Refpages/es3/html/glDebugMessageCallback.xhtml">OpenGL
ES 3.2</a>.</p>
<p>In JOGL a user may attached a <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLDebugListener.html">GLDebugListener</a>
to the <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLContext.html">GLContext</a>
via <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLContext.html#addGLDebugListener(com.jogamp.opengl.GLDebugListener)">addGLDebugListener(..)</a>.
The GLDebugListener receives the native <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLDebugMessage.html">GLDebugMessage</a>
if debugging is enabled.</p>
<p>To enable debugging, the GLContext must be created having <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLContext.html#CTX_OPTION_DEBUG">CTX_OPTION_DEBUG</a>
set via <code>setContextCreationFlags(int)</code> on the <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLContext.html#setContextCreationFlags(int)">GLContext</a>
or <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLAutoDrawable.html#setContextCreationFlags(int)">GLAutoDrawable</a>.
Alternatively, <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLContext.html#enableGLDebugMessage(boolean)">GLContext.enableGLDebugMessage(boolean</a>
may be used.</p>
<p>Test cases</p>
<ul>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestGLDebug00NEWT.java">TestGLDebug00NEWT</a></li>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestGLDebug01NEWT.java">TestGLDebug01NEWT</a></li>
</ul>
<h3 id="retrieve-mapped-buffers-data">Retrieve Mapped Buffer's Data</h3>
<p>Since OpenGL 1.5, a mapped buffer object's data can be retrieved via
<a
href="https://www.khronos.org/opengl/wiki/GLAPI/glGetBufferPointer">glGetBufferPointerv(..)</a>,
i.e. the client's memory pointer.</p>
<p>In JOGL, buffers are tracked via <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLBufferStorage.html">GLBufferStorage</a>,
covering the storage size, NIO client memory reference if mapped and
usage flags. This ensures lifecycle alignment of the native NIO Java
client memory with OpenGL buffer semantics.</p>
<p>To retrieve the bound buffer you may use <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLBase.html#getBoundBuffer(int)">getBoundBuffer(..)</a>
and <a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GLBase.html#getBufferStorage(int)">getBufferStorage(..)</a>.</p>
<p>Tracker Implementation</p>
<ul>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/jogl/classes/jogamp/opengl/GLBufferObjectTracker.java">GLBufferObjectTracker</a></li>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/jogl/classes/jogamp/opengl/GLBufferStateTracker.java">GLBufferStateTracker</a></li>
</ul>
<p>Test Cases</p>
<ul>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestMapBufferRead01NEWT.java">TestMapBufferRead01NEWT</a></li>
<li><a
href="https://jogamp.org/cgit/jogl.git/tree/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestMapBufferRead02NEWT.java">TestMapBufferRead02NEWT</a></li>
</ul>
<h2 id="references">References</h2>
<ul>
<li><a href="https://jogamp.org/">JogAmp Home</a></li>
<li><a href="https://jogamp.org/cgit/jogl.git/about/">JOGL Git
Repo</a></li>
<li><a href="https://jogamp.org/jogl/www/">JOGL Home</a></li>
<li><a
href="https://jogamp.org/jogl/doc/Overview-OpenGL-Evolution-And-JOGL.html">OpenGL
Evolution & JOGL</a></li>
<li><a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/overview-summary.html#overview_description">Mapping
of OpenGL Profiles to Interfaces</a>
<ul>
<li><a
href="https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/overview-summary.html#GLAPIInclusionCriteria">OpenGL
API Inclusion Criteria</a></li>
<li><a
href="https://jogamp.org/jogl/doc/uml/html/index-withframe.html">UML
Diagram</a></li>
</ul></li>
<li><a href="https://jogamp.org/jogl/doc/HowToBuild.html">How To
Build</a></li>
</ul>
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