Bug 1043 - Add Tessellation Control and Evaluation Shader Support

- Add GL4.GL_TESS_CONTROL_SHADER and GL4.GL_TESS_EVALUATION_SHADER support for GLSL util class ShaderCode
- Add unit test TestTessellationShader01GL4NEWT, testing TessellationShader01aGL4 and TessellationShader01bGL4

7 files changed, 488 insertions, 0 deletions

diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01aGL4.java b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01aGL4.java
new file mode 100644
index 000000000..a5807a096
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01aGL4.java
@@ -0,0 +1,191 @@
+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.opengl.test.junit.jogl.demos.gl4;
+
+import java.nio.FloatBuffer;
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GL2ES2;
+import javax.media.opengl.GL2ES3;
+import javax.media.opengl.GL2GL3;
+import javax.media.opengl.GL4;
+import javax.media.opengl.GLAutoDrawable;
+import javax.media.opengl.GLEventListener;
+
+import com.jogamp.opengl.util.glsl.ShaderCode;
+import com.jogamp.opengl.util.glsl.ShaderProgram;
+
+/**
+ * JOGL Tessellation ShaderCode GL4 test case.
+ * <p>
+ * Demonstrates tessellation-control and -evaluation shaders.
+ * </p>
+ *
+ * @author Raymond L. Rivera, 2014
+ * @author Sven Gothel
+ */
+public class TessellationShader01aGL4 implements GLEventListener  {
+    private static final double ANIMATION_RATE = 950.0;
+
+    private ShaderProgram program;
+    private final int[] vertexArray = new int[1];
+    private FloatBuffer vertexOffset;
+    private FloatBuffer backgroundColor;
+
+
+    @Override
+    public void init(final GLAutoDrawable auto) {
+        final double theta = System.currentTimeMillis() / ANIMATION_RATE;
+        vertexOffset = FloatBuffer.allocate(4);
+        vertexOffset.put(0, (float)(Math.sin(theta) * 0.5f));
+        vertexOffset.put(1, (float)(Math.cos(theta) * 0.6f));
+        vertexOffset.put(2, 0.0f);
+        vertexOffset.put(3, 0.0f);
+
+        backgroundColor = FloatBuffer.allocate(4);
+        backgroundColor.put(0, 0.25f);
+        backgroundColor.put(1, 0.25f);
+        backgroundColor.put(2, 0.25f);
+        backgroundColor.put(3, 1.0f);
+
+        final GL4 gl = auto.getGL().getGL4();
+        program = createProgram(auto);
+        gl.glGenVertexArrays(vertexArray.length, vertexArray, 0);
+        gl.glBindVertexArray(vertexArray[0]);
+        gl.glPatchParameteri(GL4.GL_PATCH_VERTICES, 3);
+        gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL2GL3.GL_LINE);
+    }
+
+    @Override
+    public void display(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+        final double value = System.currentTimeMillis() / ANIMATION_RATE;
+        gl.glClearBufferfv(GL2ES3.GL_COLOR, 0, backgroundColor);
+        gl.glUseProgram(program.program());
+        vertexOffset.put(0, (float)(Math.sin(value) * 0.5f));
+        vertexOffset.put(1, (float)(Math.cos(value) * 0.6f));
+        gl.glVertexAttrib4fv(0, vertexOffset);
+        gl.glDrawArrays(GL4.GL_PATCHES, 0, 3);
+    }
+
+    @Override
+    public void dispose(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+        gl.glDeleteVertexArrays(vertexArray.length, vertexArray, 0);
+        program.destroy(gl);
+    }
+
+    @Override
+    public void reshape(final GLAutoDrawable auto, final int x, final int y, final int width, final int height) {
+        // final GL4 gl = auto.getGL().getGL4();
+    }
+
+    private ShaderProgram createProgram(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+        final String vertexSource =
+            "#version 440 core                                          \n" +
+            "                                                           \n" +
+            "layout (location = 0) in vec4 offset;                      \n" +
+            "                                                           \n" +
+            "void main(void)                                            \n" +
+            "{                                                          \n" +
+            "   const vec4 vertices[3] = vec4[3] (                      \n" +
+            "                           vec4( 0.25,  0.25, 0.5, 1.0),   \n" +
+            "                           vec4(-0.25, -0.25, 0.5, 1.0),   \n" +
+            "                           vec4( 0.25, -0.25, 0.5, 1.0));  \n" +
+            "   gl_Position = vertices[gl_VertexID] + offset;           \n" +
+            "}                                                          \n";
+        final String tessCtrlSource   =
+            "#version 440 core                                          \n" +
+            "layout (vertices = 3) out;                                 \n" +
+            "                                                           \n" +
+            "void main(void)                                            \n" +
+            "{                                                          \n" +
+            "   if (gl_InvocationID == 0)                               \n" +
+            "   {                                                       \n" +
+            "       gl_TessLevelInner[0] = 5.0;                         \n" +
+            "       gl_TessLevelOuter[0] = 5.0;                         \n" +
+            "       gl_TessLevelOuter[1] = 5.0;                         \n" +
+            "       gl_TessLevelOuter[2] = 5.0;                         \n" +
+            "   }                                                       \n" +
+            "   gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;\n" +
+            "}                                                          \n";
+        final String tessEvalSource   =
+            "#version 440 core                                          \n" +
+            "                                                           \n" +
+            "layout (triangles, equal_spacing, cw) in;                  \n" +
+            "                                                           \n" +
+            "void main(void)                                            \n" +
+            "{                                                          \n" +
+            "   gl_Position = (gl_TessCoord.x * gl_in[0].gl_Position) + \n" +
+            "               (gl_TessCoord.y * gl_in[1].gl_Position)   + \n" +
+            "               (gl_TessCoord.z * gl_in[2].gl_Position);    \n" +
+            "}                                                          \n";
+        final String fragmentSource   =
+            "#version 440 core                                          \n" +
+            "                                                           \n" +
+            "out vec4 color;                                            \n" +
+            "                                                           \n" +
+            "void main(void)                                            \n" +
+            "{                                                          \n" +
+            "   color = vec4(1.0, 1.0, 1.0, 1.0);                       \n" +
+            "}                                                          \n";
+
+        final ShaderCode vertexShader     = createShader(gl, GL2ES2.GL_VERTEX_SHADER, vertexSource);
+        final ShaderCode tessCtrlShader   = createShader(gl, GL4.GL_TESS_CONTROL_SHADER, tessCtrlSource);
+        final ShaderCode tessEvalShader   = createShader(gl, GL4.GL_TESS_EVALUATION_SHADER, tessEvalSource);
+        final ShaderCode fragmentShader   = createShader(gl, GL2ES2.GL_FRAGMENT_SHADER, fragmentSource);
+
+        final ShaderProgram program       = new ShaderProgram();
+
+        program.init(gl);
+        program.add(vertexShader);
+        program.add(tessCtrlShader);
+        program.add(tessEvalShader);
+        program.add(fragmentShader);
+
+        program.link(gl, System.err);
+        if(!program.validateProgram(gl, System.out))
+            System.err.println("[error] Program linking failed.");
+
+        return program;
+    }
+
+    private ShaderCode createShader(final GL4 gl, final int shaderType, final String source) {
+        final String[][] sources = new String[1][1];
+        sources[0] = new String[]{ source };
+        final ShaderCode shader = new ShaderCode(shaderType, sources.length, sources);
+
+        final boolean compiled = shader.compile(gl, System.err);
+        if (!compiled)
+            System.err.println("[error] Shader compilation failed.");
+
+        return shader;
+    }
+
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01bGL4.java b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01bGL4.java
new file mode 100644
index 000000000..7be26e400
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/TessellationShader01bGL4.java
@@ -0,0 +1,142 @@
+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.opengl.test.junit.jogl.demos.gl4;
+
+import java.nio.FloatBuffer;
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GL2ES2;
+import javax.media.opengl.GL2ES3;
+import javax.media.opengl.GL2GL3;
+import javax.media.opengl.GL4;
+import javax.media.opengl.GLAutoDrawable;
+import javax.media.opengl.GLEventListener;
+import javax.media.opengl.GLException;
+
+import com.jogamp.opengl.util.glsl.ShaderCode;
+import com.jogamp.opengl.util.glsl.ShaderProgram;
+
+/**
+ * JOGL Tessellation ShaderCode GL4 test case.
+ * <p>
+ * Demonstrates tessellation-control and -evaluation shaders.
+ * </p>
+ *
+ * @author Raymond L. Rivera, 2014
+ * @author Sven Gothel
+ */
+public class TessellationShader01bGL4 implements GLEventListener  {
+    private static final double ANIMATION_RATE = 950.0;
+
+    private ShaderProgram program;
+    private final int[] vertexArray = new int[1];
+    private FloatBuffer vertexOffset;
+    private FloatBuffer backgroundColor;
+
+
+    @Override
+    public void init(final GLAutoDrawable auto) {
+        final double theta = System.currentTimeMillis() / ANIMATION_RATE;
+        vertexOffset = FloatBuffer.allocate(4);
+        vertexOffset.put(0, (float)(Math.sin(theta) * 0.5f));
+        vertexOffset.put(1, (float)(Math.cos(theta) * 0.6f));
+        vertexOffset.put(2, 0.0f);
+        vertexOffset.put(3, 0.0f);
+
+        backgroundColor = FloatBuffer.allocate(4);
+        backgroundColor.put(0, 0.25f);
+        backgroundColor.put(1, 0.25f);
+        backgroundColor.put(2, 0.25f);
+        backgroundColor.put(3, 1.0f);
+
+        final GL4 gl = auto.getGL().getGL4();
+        program = createProgram(auto);
+        gl.glGenVertexArrays(vertexArray.length, vertexArray, 0);
+        gl.glBindVertexArray(vertexArray[0]);
+        gl.glPatchParameteri(GL4.GL_PATCH_VERTICES, 3);
+        gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL2GL3.GL_LINE);
+    }
+
+    @Override
+    public void display(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+        final double value = System.currentTimeMillis() / ANIMATION_RATE;
+        gl.glClearBufferfv(GL2ES3.GL_COLOR, 0, backgroundColor);
+        gl.glUseProgram(program.program());
+        vertexOffset.put(0, (float)(Math.sin(value) * 0.5f));
+        vertexOffset.put(1, (float)(Math.cos(value) * 0.6f));
+        gl.glVertexAttrib4fv(0, vertexOffset);
+        gl.glDrawArrays(GL4.GL_PATCHES, 0, 3);
+    }
+
+    @Override
+    public void dispose(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+        gl.glDeleteVertexArrays(vertexArray.length, vertexArray, 0);
+        program.destroy(gl);
+    }
+
+    @Override
+    public void reshape(final GLAutoDrawable auto, final int x, final int y, final int width, final int height) {
+        // final GL4 gl = auto.getGL().getGL4();
+    }
+
+    static final String shaderBasename = "tess_example01";
+
+    private ShaderProgram createProgram(final GLAutoDrawable auto) {
+        final GL4 gl = auto.getGL().getGL4();
+
+        final ShaderProgram sp;
+        {
+            final ShaderCode vs, tcs, tes, fs;
+            vs = ShaderCode.create(gl, GL2ES2.GL_VERTEX_SHADER, this.getClass(),
+                                   "shader", "shader/bin", shaderBasename, true);
+            tcs = ShaderCode.create(gl, GL4.GL_TESS_CONTROL_SHADER, this.getClass(),
+                                   "shader", "shader/bin", shaderBasename, true);
+            tes = ShaderCode.create(gl, GL4.GL_TESS_EVALUATION_SHADER, this.getClass(),
+                                   "shader", "shader/bin", shaderBasename, true);
+            fs = ShaderCode.create(gl, GL2ES2.GL_FRAGMENT_SHADER, this.getClass(),
+                                   "shader", "shader/bin", shaderBasename, true);
+            vs.defaultShaderCustomization(gl, true, true);
+            tcs.defaultShaderCustomization(gl, true, true);
+            tes.defaultShaderCustomization(gl, true, true);
+            fs.defaultShaderCustomization(gl, true, true);
+
+            sp = new ShaderProgram();
+            sp.add(gl, vs, System.err);
+            sp.add(gl, tcs, System.err);
+            sp.add(gl, tes, System.err);
+            sp.add(gl, fs, System.err);
+            if(!sp.link(gl, System.err)) {
+                throw new GLException("Couldn't link program: "+sp);
+            }
+        }
+
+        return sp;
+    }
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/newt/TestTessellationShader01GL4NEWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/newt/TestTessellationShader01GL4NEWT.java
new file mode 100644
index 000000000..a05dcec06
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/newt/TestTessellationShader01GL4NEWT.java
@@ -0,0 +1,117 @@
+/**
+ * Copyright 2014 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.opengl.test.junit.jogl.demos.gl4.newt;
+
+import java.io.IOException;
+
+import javax.media.opengl.GLCapabilities;
+import javax.media.opengl.GLEventListener;
+import javax.media.opengl.GLProfile;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.FixMethodOrder;
+import org.junit.runners.MethodSorters;
+
+import com.jogamp.newt.opengl.GLWindow;
+import com.jogamp.opengl.test.junit.jogl.demos.gl4.TessellationShader01aGL4;
+import com.jogamp.opengl.test.junit.jogl.demos.gl4.TessellationShader01bGL4;
+import com.jogamp.opengl.test.junit.util.MiscUtils;
+import com.jogamp.opengl.test.junit.util.QuitAdapter;
+import com.jogamp.opengl.test.junit.util.UITestCase;
+import com.jogamp.opengl.util.Animator;
+
+/**
+ * Test Geometry shader demo TessellationShader01aGL4 and TessellationShader01bGL4
+ */
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class TestTessellationShader01GL4NEWT extends UITestCase {
+    static long duration = 500; // ms
+
+    static GLCapabilities getCaps(final String profile) {
+        if( !GLProfile.isAvailable(profile) )  {
+            System.err.println("Profile "+profile+" n/a");
+            return null;
+        }
+        return new GLCapabilities(GLProfile.get(profile));
+    }
+
+    @Test
+    public void test01_01a() throws InterruptedException {
+        final GLCapabilities caps = getCaps(GLProfile.GL4);
+        if( null == caps ) { return; }
+        testImpl(caps, new TessellationShader01aGL4());
+    }
+
+    @Test
+    public void test02_01b() throws InterruptedException {
+        final GLCapabilities caps = getCaps(GLProfile.GL4);
+        if( null == caps ) { return; }
+        testImpl(caps, new TessellationShader01bGL4());
+    }
+
+    private void testImpl(final GLCapabilities caps, final GLEventListener glel) throws InterruptedException {
+        final GLWindow glWindow = GLWindow.create(caps);
+        Assert.assertNotNull(glWindow);
+        glWindow.setSize(800, 600);
+        glWindow.setVisible(true);
+        glWindow.setTitle("JOGL Tessellation Shader Test");
+        Assert.assertTrue(glWindow.isNativeValid());
+
+        final QuitAdapter quitAdapter = new QuitAdapter();
+        glWindow.addKeyListener(quitAdapter);
+        glWindow.addWindowListener(quitAdapter);
+        glWindow.addGLEventListener( glel );
+
+        final SnapshotGLEventListener snapshotGLEventListener = new SnapshotGLEventListener();
+        glWindow.addGLEventListener(snapshotGLEventListener);
+
+        final Animator animator = new Animator(glWindow);
+        animator.start();
+
+        animator.setUpdateFPSFrames(60, System.err);
+        snapshotGLEventListener.setMakeSnapshot();
+
+        while(!quitAdapter.shouldQuit() && animator.isAnimating() && animator.getTotalFPSDuration()<duration) {
+            Thread.sleep(100);
+        }
+
+        animator.stop();
+        glWindow.destroy();
+    }
+
+    public static void main(final String args[]) throws IOException {
+        for(int i=0; i<args.length; i++) {
+            if(args[i].equals("-time")) {
+                i++;
+                duration = MiscUtils.atol(args[i], duration);
+            }
+        }
+        org.junit.runner.JUnitCore.main(TestTessellationShader01GL4NEWT.class.getName());
+    }
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.fp b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.fp
new file mode 100644
index 000000000..8a3b23203
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.fp
@@ -0,0 +1,6 @@
+
+out vec4 color;
+
+void main(void) {
+    color = vec4(1.0, 1.0, 1.0, 1.0);
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tcp b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tcp
new file mode 100644
index 000000000..b76aa580d
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tcp
@@ -0,0 +1,12 @@
+
+layout (vertices = 3) out;
+
+void main(void) {
+    if (gl_InvocationID == 0) {
+        gl_TessLevelInner[0] = 5.0;
+        gl_TessLevelOuter[0] = 5.0;
+        gl_TessLevelOuter[1] = 5.0;
+        gl_TessLevelOuter[2] = 5.0;
+    }
+    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tep b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tep
new file mode 100644
index 000000000..9c307f5d4
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.tep
@@ -0,0 +1,8 @@
+
+layout (triangles, equal_spacing, cw) in;
+
+void main(void) {
+    gl_Position = (gl_TessCoord.x * gl_in[0].gl_Position) +
+                  (gl_TessCoord.y * gl_in[1].gl_Position) +
+                  (gl_TessCoord.z * gl_in[2].gl_Position);
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.vp b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.vp
new file mode 100644
index 000000000..c207c1335
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/demos/gl4/shader/tess_example01.vp
@@ -0,0 +1,12 @@
+
+layout (location = 0) in vec4 offset;
+
+void main(void)
+{  
+  const vec4 vertices[3] = 
+      vec4[3] (
+          vec4( 0.25,  0.25, 0.5, 1.0),
+          vec4(-0.25, -0.25, 0.5, 1.0),
+          vec4( 0.25, -0.25, 0.5, 1.0) );
+  gl_Position = vertices[gl_VertexID] + offset;
+}