Checked in experimental Cg support and a couple of small demos. By

default it is not built and javadoc is not generated for it. The demos
are not compiled by the jogl-demos project makefile since there are
issues to be thought through with operations like
cgCreateProgramFromFile and their interaction with launching over the
web via Java Web Start.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/jogl-demos/trunk@8 3298f667-5e0e-4b4a-8ed4-a3559d26a5f4

5 files changed, 826 insertions, 0 deletions

diff --git a/src/demos/cg/runtime_ogl/cgGL_vertex_example.cg b/src/demos/cg/runtime_ogl/cgGL_vertex_example.cg
new file mode 100644
index 0000000..dae355e
--- /dev/null
+++ b/src/demos/cg/runtime_ogl/cgGL_vertex_example.cg
@@ -0,0 +1,29 @@
+
+struct appdata
+{
+    float4 position : POSITION;
+    float3 normal : NORMAL;
+    float3 color : DIFFUSE;
+    float3 TestColor : SPECULAR;
+};
+
+struct vfconn
+{
+    float4 HPOS : POSITION;
+    float4 COL0 : COLOR0;
+};
+
+vfconn main(appdata IN,
+            uniform float4 Kd,
+            uniform float4x4 ModelViewProj)
+{
+    vfconn OUT;
+
+    OUT.HPOS = mul(ModelViewProj, IN.position);
+
+    OUT.COL0.xyz = Kd.xyz * IN.TestColor.xyz;
+    OUT.COL0.w = 1.0;
+
+    return OUT;
+} // main
+
diff --git a/src/demos/cg/runtime_ogl/cgGL_vertex_example.java b/src/demos/cg/runtime_ogl/cgGL_vertex_example.java
new file mode 100644
index 0000000..16c3e1a
--- /dev/null
+++ b/src/demos/cg/runtime_ogl/cgGL_vertex_example.java
@@ -0,0 +1,278 @@
+/*
+ * Portions Copyright (C) 2003 Sun Microsystems, Inc.
+ * All rights reserved.
+ */
+
+/*
+ *
+ * COPYRIGHT NVIDIA CORPORATION 2003. ALL RIGHTS RESERVED.
+ * BY ACCESSING OR USING THIS SOFTWARE, YOU AGREE TO:
+ *
+ *  1) ACKNOWLEDGE NVIDIA'S EXCLUSIVE OWNERSHIP OF ALL RIGHTS
+ *     IN AND TO THE SOFTWARE;
+ *
+ *  2) NOT MAKE OR DISTRIBUTE COPIES OF THE SOFTWARE WITHOUT
+ *     INCLUDING THIS NOTICE AND AGREEMENT;
+ *
+ *  3) ACKNOWLEDGE THAT TO THE MAXIMUM EXTENT PERMITTED BY
+ *     APPLICABLE LAW, THIS SOFTWARE IS PROVIDED *AS IS* AND
+ *     THAT NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES,
+ *     EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED
+ *     TO, IMPLIED WARRANTIES OF MERCHANTABILITY  AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS BE LIABLE FOR ANY
+ * SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
+ * WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS
+ * OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS
+ * INFORMATION, OR ANY OTHER PECUNIARY LOSS), INCLUDING ATTORNEYS'
+ * FEES, RELATING TO THE USE OF OR INABILITY TO USE THIS SOFTWARE,
+ * EVEN IF NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ */
+
+import net.java.games.cg.*;
+import net.java.games.jogl.*;
+
+import java.awt.*;
+import java.awt.event.*;
+
+/**
+ * cgGL_vertex_example: simple demo of Nvidia CgGL API. Based upon C version
+ * distributed with the NVidia Cg Toolkit. Ported to the Java language by
+ * Christopher Kline 5/29/2003.
+ */
+public class cgGL_vertex_example implements GLEventListener 
+{
+  
+  /******************************************************************************/
+  /*** Static Data                                                            ***/
+  /******************************************************************************/
+
+  private final int TextureRes = 512;
+  
+  private static CGcontext Context = null;
+  private static CGprogram Program = null;
+  private static CGparameter KdParam = null;
+  private static CGparameter ModelViewProjParam = null;
+  private static CGparameter TestColorParam = null;
+  private static /*CGprofile*/ int profile;
+  
+  static
+  {
+    String os = System.getProperty("os.name").toLowerCase();
+    profile = os.startsWith("mac os") ? CgGL.CG_PROFILE_ARBVP1 : CgGL.CG_PROFILE_VP20;
+  }
+  
+  private float LightDiffuse[] = {1.0f, 0.0f, 0.0f, 1.0f};  
+  private float LightPosition[] = {1.0f, 1.0f, 1.0f, 0.0f};  
+
+  private float CubeNormals[/*6*/][/*3*/] = 
+  {  
+    {-1.0f, 0.0f, 0.0f}, {0.0f, 1.0f, 0.0f},
+    {1.0f, 0.0f, 0.0f}, {0.0f, -1.0f, 0.0f},
+    {0.0f, 0.0f, 1.0f}, {0.0f, 0.0f, -1.0f} 
+  };
+
+  private int CubeFaces[/*6*/][/*4*/] = 
+  {  
+    {0, 1, 2, 3}, {3, 2, 6, 7}, {7, 6, 5, 4},
+    {4, 5, 1, 0}, {5, 6, 2, 1}, {7, 4, 0, 3} 
+  };
+
+  private float CubeVertices[][] = new float[8][3];  
+
+/******************************************************************************/
+
+  private int MATRIX_INDEX(int i, int j) { return (j + i * 4); }
+
+  private static void CheckCgError()
+  {
+    /*CGerror*/ int err = CgGL.cgGetError();
+
+    if (err != CgGL.CG_NO_ERROR)
+    {
+      System.out.println("CG error: " + CgGL.cgGetErrorString(err));
+      System.exit(1);
+    }
+  }
+
+
+  private void DrawCube(GL gl)
+  {
+    int i;
+
+    CgGL.cgGLBindProgram(Program);
+    CheckCgError();
+
+    /*
+     * Set various uniform parameters including the ModelViewProjection
+     * matrix for transforming the incoming position into HPOS.
+     */
+    if(KdParam != null)
+      CgGL.cgGLSetParameter4f(KdParam, 1.0f, 1.0f, 0.0f, 1.0f);
+    
+    /* Set the concatenate modelview and projection matrices */
+    if(ModelViewProjParam != null)
+      CgGL.cgGLSetStateMatrixParameter(ModelViewProjParam,
+                                  CgGL.CG_GL_MODELVIEW_PROJECTION_MATRIX,
+                                  CgGL.CG_GL_MATRIX_IDENTITY);
+
+    CgGL.cgGLEnableProfile(profile);
+
+
+    /*
+     * Create cube with per-vertex varying attributes 
+     */
+    for(i = 0; i < 6; i++) 
+    {
+      gl.glBegin(GL.GL_QUADS);
+
+      gl.glNormal3f(CubeNormals[i][0], CubeNormals[i][1], CubeNormals[i][0]);
+      CgGL.cgGLSetParameter3f(TestColorParam, 1.0f, 0.0f, 0.0f);
+      float[] verts = CubeVertices[CubeFaces[i][0]];
+      gl.glVertex3f(verts[0], verts[1], verts[2]);
+
+      CgGL.cgGLSetParameter3f(TestColorParam, 0.0f, 1.0f, 0.0f);
+      verts = CubeVertices[CubeFaces[i][1]];
+      gl.glVertex3f(verts[0], verts[1], verts[2]);
+
+      CgGL.cgGLSetParameter3f(TestColorParam, 0.0f, 0.0f, 1.0f);
+      verts = CubeVertices[CubeFaces[i][2]];
+      gl.glVertex3f(verts[0], verts[1], verts[2]);
+
+      CgGL.cgGLSetParameter3f(TestColorParam, 1.0f, 1.0f, 1.0f);
+      verts = CubeVertices[CubeFaces[i][3]];
+      gl.glVertex3f(verts[0], verts[1], verts[2]);
+    
+      gl.glEnd();
+    }
+
+    CgGL.cgGLDisableProfile(profile);
+  }
+
+  public void display(GLDrawable drawable) 
+  {
+    GL gl = drawable.getGL();
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+    DrawCube(gl);
+    //glutSwapBuffers();
+  }
+
+  void InitializeCube(float v[/*8*/][/*3*/])
+  {
+    /* Setup cube vertex data. */
+    v[0][0] = v[1][0] = v[2][0] = v[3][0] = -1;
+    v[4][0] = v[5][0] = v[6][0] = v[7][0] = 1;
+    v[0][1] = v[1][1] = v[4][1] = v[5][1] = -1;
+    v[2][1] = v[3][1] = v[6][1] = v[7][1] = 1;
+    v[0][2] = v[3][2] = v[4][2] = v[7][2] = 1;
+    v[1][2] = v[2][2] = v[5][2] = v[6][2] = -1;
+  }
+  
+  public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged)
+  {
+    // nothing
+  }
+
+  public void init(GLDrawable drawable) 
+  {
+    // Note: we initialize Cg in this init() method instead of main()
+    // because Cg (apparently) requires an active OpenGL context in order to
+    // initialize correctly (otherwise the CheckCgError() call after
+    // cgGLLoadProgram() will fail).
+    
+    /* Test cgContext creation */
+    Context = CgGL.cgCreateContext();
+    CheckCgError();
+
+    /* Test adding source text to context */
+    Program = CgGL.cgCreateProgramFromFile(
+      Context, CgGL.CG_SOURCE, "cgGL_vertex_example.cg",
+      profile, null, null);
+    CheckCgError();
+
+    System.err.println(
+      "LAST LISTING----" + CgGL.cgGetLastListing(Context) + "----\n");
+
+    System.err.println(
+      "---- PROGRAM BEGIN ----\n"+
+      CgGL.cgGetProgramString(Program, CgGL.CG_COMPILED_PROGRAM)+
+      "---- PROGRAM END ----\n");
+
+    if(Program != null)
+    {
+      CgGL.cgGLLoadProgram(Program);
+      CheckCgError();
+
+      KdParam = CgGL.cgGetNamedParameter(Program, "Kd");
+      CheckCgError();
+
+      ModelViewProjParam = CgGL.cgGetNamedParameter(Program, "ModelViewProj");
+      CheckCgError();
+
+      TestColorParam = CgGL.cgGetNamedParameter(Program, "IN.TestColor");
+      CheckCgError();
+    }
+    GL gl = drawable.getGL();
+    GLU glu = drawable.getGLU();
+
+    InitializeCube(CubeVertices);
+
+    /* Enable a single OpenGL light. */
+    gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, LightDiffuse);
+    gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, LightPosition);
+    gl.glEnable(GL.GL_LIGHT0);
+    if (false) { // #if 0
+      gl.glEnable(GL.GL_LIGHTING);
+    } else {     // #else
+      gl.glDisable(GL.GL_LIGHTING);
+    }            // #endif
+
+    /* Use depth buffering for hidden surface elimination. */
+    gl.glEnable(GL.GL_DEPTH_TEST);
+
+    /* Setup the view of the cube. */
+    gl.glMatrixMode(GL.GL_PROJECTION);
+    glu.gluPerspective( /* field of view in degree */ 40.0f,
+                    /* aspect ratio */ 1.0f,
+                    /* Z near */ 1.0f, /* Z far */ 10.0f);
+    gl.glMatrixMode(GL.GL_MODELVIEW);
+    glu.gluLookAt(0.0f, 0.0f, 5.0f,  /* eye is at (0,0,5) */
+              0.0f, 0.0f, 0.0f,  /* center is at (0,0,0) */
+              0.0f, 1.0f, 0.);  /* up is in positive Y direction */
+
+    /* Adjust cube position to be asthetic angle. */
+    gl.glTranslatef(0.0f, 0.0f, -1.0f);
+    if (true) { // #if 1
+      gl.glRotatef(60, 1.0f, 0.0f, 0.0f);
+      gl.glRotatef(-20, 0.0f, 0.0f, 1.0f);
+    } //#endif
+  
+  }
+
+  public void reshape(GLDrawable drawable, int x, int y, int width, int height)
+  {
+    // do nothing
+  }
+
+  public static void main(String[] argv)
+  {    
+    Frame frame = new Frame("NVidia Cg Toolkit \"cgGL_vertex_example\" demo");
+    GLCanvas canvas = GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.addGLEventListener(new cgGL_vertex_example());
+
+    frame.add(canvas);
+    frame.setSize(500, 500);
+    final Animator animator = new Animator(canvas);
+    frame.addWindowListener(new WindowAdapter() {
+        public void windowClosing(WindowEvent e) {
+          animator.stop();
+          System.exit(0);
+        }
+      });
+    frame.show();
+    animator.start();
+  }
+
+}   
diff --git a/src/demos/cg/runtime_ogl_vertex_fragment/demo_frag.cg b/src/demos/cg/runtime_ogl_vertex_fragment/demo_frag.cg
new file mode 100644
index 0000000..70206fa
--- /dev/null
+++ b/src/demos/cg/runtime_ogl_vertex_fragment/demo_frag.cg
@@ -0,0 +1,61 @@
+/*********************************************************************NVMH3****
+
+Copyright NVIDIA Corporation 2002
+TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED
+*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS
+BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
+WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
+BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)
+ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS
+BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+
+Comments:
+
+******************************************************************************/
+
+// Utility functions that return the appropriate components from the vector
+// of lighting coefficients returned by the standard library lighting
+// funciton, lit().
+
+half diffuse(half4 l) { return l.y; }
+half specular(half4 l) { return l.z; }
+
+// Main shader.
+
+half4 main(float3 Peye         : TEXCOORD0,
+           half3 Neye         : TEXCOORD1,
+           half2 uv           : TEXCOORD2,
+           half3 Kd           : COLOR0,
+           half3 Ks           : COLOR1,
+           uniform sampler2D diffuseMap,
+           uniform float3 Plight,
+           uniform half3 lightColor,
+           uniform half3 shininess) : COLOR
+{
+    // Normalize surface normal, vector to light source, and vector
+    // to the viewer
+    half3 N = normalize(Neye);
+    half3 L = normalize(Plight - Peye);
+    half3 V = normalize(-Peye);
+
+    // Compute half-angle vector for specular lighting
+    half3 H = normalize(L + V);
+
+    // Compute lighting values.  lit() returns the diffuse coefficient
+    // in y (or zero, if NdotL < 0), and the specular coefficient in z
+    // (or zero, also if NdotL < 0).
+    half NdotL = dot(N, L), NdotH = dot(N, H);
+    half4 lighting = lit(NdotL, NdotH, shininess);
+
+    // Compute overall color for the fragment.  Scale sum of diffuse
+    // and specular contributions together and by the light color.
+    half3 C = lightColor * 
+	(diffuse(lighting) * Kd * (half3)tex2D(diffuseMap, uv).xyz +
+	 specular(lighting) * Ks);
+
+    // Always set the alpha value to 1.
+    return half4(C, 1);
+}
diff --git a/src/demos/cg/runtime_ogl_vertex_fragment/demo_vert.cg b/src/demos/cg/runtime_ogl_vertex_fragment/demo_vert.cg
new file mode 100644
index 0000000..e767ad3
--- /dev/null
+++ b/src/demos/cg/runtime_ogl_vertex_fragment/demo_vert.cg
@@ -0,0 +1,46 @@
+/*********************************************************************NVMH3****
+
+Copyright NVIDIA Corporation 2002
+TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED
+*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS
+BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
+WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
+BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)
+ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS
+BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+
+Comments:
+
+******************************************************************************/
+
+void main(float4 Pobject      : POSITION, 
+          float3 Nobject      : NORMAL,
+          float2 TexUV        : TEXCOORD0,
+          float3 diffuse      : TEXCOORD1,
+          float3 specular     : TEXCOORD2,
+          uniform float4x4 ModelViewProj,
+          uniform float4x4 ModelView,
+          uniform float4x4 ModelViewIT,
+
+          out float4 HPosition    : POSITION,
+          out float3 Peye         : TEXCOORD0,
+          out float3 Neye         : TEXCOORD1,
+          out float2 uv           : TEXCOORD2,
+          out float3 Kd           : COLOR0,
+          out float3 Ks           : COLOR1)
+{
+    // compute homogeneous position of vertex for rasterizer
+    HPosition = mul(ModelViewProj, Pobject);
+    // transform position and normal from model-space to view-space
+    Peye = mul(ModelView, Pobject).xyz;
+    Neye = mul(ModelViewIT, float4(Nobject, 0)).xyz;
+    // pass uv, Kd, and Ks through unchanged; if they are varying
+    // per-vertex, however, they'll be interpolated before being
+    // passed to the fragment program.
+    uv = TexUV;
+    Kd = diffuse;
+    Ks = specular;
+}
diff --git a/src/demos/cg/runtime_ogl_vertex_fragment/runtime_ogl_vertex_fragment.java b/src/demos/cg/runtime_ogl_vertex_fragment/runtime_ogl_vertex_fragment.java
new file mode 100644
index 0000000..38ab297
--- /dev/null
+++ b/src/demos/cg/runtime_ogl_vertex_fragment/runtime_ogl_vertex_fragment.java
@@ -0,0 +1,412 @@
+/*
+ * Portions Copyright (C) 2003 Sun Microsystems, Inc.
+ * All rights reserved.
+ */
+
+/*
+ *
+ * COPYRIGHT NVIDIA CORPORATION 2003. ALL RIGHTS RESERVED.
+ * BY ACCESSING OR USING THIS SOFTWARE, YOU AGREE TO:
+ *
+ *  1) ACKNOWLEDGE NVIDIA'S EXCLUSIVE OWNERSHIP OF ALL RIGHTS
+ *     IN AND TO THE SOFTWARE;
+ *
+ *  2) NOT MAKE OR DISTRIBUTE COPIES OF THE SOFTWARE WITHOUT
+ *     INCLUDING THIS NOTICE AND AGREEMENT;
+ *
+ *  3) ACKNOWLEDGE THAT TO THE MAXIMUM EXTENT PERMITTED BY
+ *     APPLICABLE LAW, THIS SOFTWARE IS PROVIDED *AS IS* AND
+ *     THAT NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES,
+ *     EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED
+ *     TO, IMPLIED WARRANTIES OF MERCHANTABILITY  AND FITNESS
+ *     FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS BE LIABLE FOR ANY
+ * SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
+ * WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS
+ * OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS
+ * INFORMATION, OR ANY OTHER PECUNIARY LOSS), INCLUDING ATTORNEYS'
+ * FEES, RELATING TO THE USE OF OR INABILITY TO USE THIS SOFTWARE,
+ * EVEN IF NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ */
+
+import net.java.games.cg.*;
+import net.java.games.jogl.*;
+import net.java.games.jogl.util.*;
+
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.nio.*;
+import java.util.*;
+
+/**
+ * Basic example of the use of the Cg runtime in a simple OpenGL program.
+ * Ported to Java from NVidia's original C source by Christopher Kline, 06
+ * June 2003. Original NVidia copyright is preserved in the source code.
+ */
+public class runtime_ogl_vertex_fragment implements GLEventListener 
+{
+
+  // Global variables: hold the Cg context that we're storing our programs
+  // in as well as handles to the vertex and fragment program used in this
+  // demo.
+
+  CGcontext context;
+  CGprogram vertexProgram, fragmentProgram;
+
+  ///////////////////////////////////////////////////////////////////////////
+
+  // Main program; do basic GLUT and Cg setup, but leave most of the work
+  // to the display() function.
+
+  public static void main(String[] argv)
+  {    
+    Frame frame = new Frame("Cg demo (runtime_ogl_vertex_fragment)");
+    GLCanvas canvas = GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
+    canvas.addGLEventListener(new runtime_ogl_vertex_fragment());
+
+    // Use debug pipeline
+    canvas.setGL(new DebugGL(canvas.getGL()));
+
+    frame.add(canvas);
+    frame.setSize(512, 512);
+    final Animator animator = new Animator(canvas);
+    frame.addWindowListener(new WindowAdapter() {
+      public void windowClosing(WindowEvent e) {
+        animator.stop();
+        System.out.println("Exiting");
+        System.exit(0);
+      }
+    });
+    frame.show();
+    animator.start();
+
+    // and all the rest happens in the display function...
+  }
+
+  public void init(GLDrawable drawable) 
+  {
+    GL gl = drawable.getGL();
+    
+    // Basic Cg setup; register a callback function for any errors
+    // and create an initial context
+    //cgSetErrorCallback(handleCgError); // not yet exposed in Cg binding
+    context = CgGL.cgCreateContext();
+  
+    // Do one-time setup only once; setup Cg programs and textures
+    // and set up OpenGL state.
+    ChooseProfiles();
+    LoadCgPrograms();
+    LoadTextures(gl);
+
+    gl.glEnable(GL.GL_DEPTH_TEST);
+  }
+
+  private void CheckCgError()
+  {
+    /*CGerror*/ int err = CgGL.cgGetError();
+
+    if (err != CgGL.CG_NO_ERROR)
+    {
+      throw new RuntimeException("CG error: " + CgGL.cgGetErrorString(err));
+    }
+  }
+
+  private static int curTime = 0;
+  
+  // display callback function
+  public void display(GLDrawable drawable) 
+  {
+
+    GL gl = drawable.getGL();
+    GLU glu = drawable.getGLU();
+    
+    // The usual OpenGL stuff to clear the screen and set up viewing.
+    gl.glClearColor(.25f, .25f, .25f, 1.0f);
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+
+    gl.glMatrixMode(GL.GL_PROJECTION);
+    gl.glLoadIdentity();
+    glu.gluPerspective(30.0f, 1.0f, .1f, 100);
+
+    gl.glMatrixMode(GL.GL_MODELVIEW);
+    gl.glLoadIdentity();
+    glu.gluLookAt(4, 4, -4, 0, 0, 0, 0, 1, 0);
+
+    // Make the object rotate a bit each time the display function
+    // is called
+    gl.glRotatef(curTime, 0, 1, 0);
+
+    // Now make sure that the vertex and fragment programs, loaded
+    // in LoadCgPrograms() are bound.
+    CgGL.cgGLBindProgram(vertexProgram);
+    CgGL.cgGLBindProgram(fragmentProgram);
+
+    // Bind uniform parameters to vertex shader
+    CgGL.cgGLSetStateMatrixParameter(CgGL.cgGetNamedParameter(vertexProgram, "ModelViewProj"),
+                                     CgGL.CG_GL_MODELVIEW_PROJECTION_MATRIX,
+                                     CgGL.CG_GL_MATRIX_IDENTITY);
+    CgGL.cgGLSetStateMatrixParameter(CgGL.cgGetNamedParameter(vertexProgram, "ModelView"),
+                                     CgGL.CG_GL_MODELVIEW_MATRIX,
+                                     CgGL.CG_GL_MATRIX_IDENTITY);
+    CgGL.cgGLSetStateMatrixParameter(CgGL.cgGetNamedParameter(vertexProgram, "ModelViewIT"),
+                                     CgGL.CG_GL_MODELVIEW_MATRIX,
+                                     CgGL.CG_GL_MATRIX_INVERSE_TRANSPOSE);
+
+    // We can also go ahead and bind varying parameters to vertex shader
+    // that we just want to have the same value for all vertices.  The
+    // vertex shader could be modified so that these were uniform for
+    // better efficiency, but this gives us flexibility for the future.
+    float Kd[] = { .7f, .2f, .2f }, Ks[] = { .9f, .9f, .9f };
+    CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(vertexProgram, "diffuse"), Kd);
+    CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(vertexProgram, "specular"), Ks);
+
+    // Now bind uniform parameters to fragment shader
+    float lightPos[] = { 3, 2, -3 };
+    CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(fragmentProgram, "Plight"), lightPos);
+    float lightColor[] = { 1, 1, 1 };
+    CgGL.cgGLSetParameter3fv(CgGL.cgGetNamedParameter(fragmentProgram, "lightColor"), 
+                             lightColor);
+    CgGL.cgGLSetParameter1f(CgGL.cgGetNamedParameter(fragmentProgram, "shininess"), 40);
+
+    // And finally, enable the approprate texture for fragment shader; the
+    // texture was originally set up in LoadTextures().
+    CgGL.cgGLEnableTextureParameter(CgGL.cgGetNamedParameter(fragmentProgram,
+                                                             "diffuseMap"));
+    // And go ahead and draw the scene geometry
+    DrawGeometry(gl);
+
+    // Disable the texture now that we're done with it.
+    CgGL.cgGLDisableTextureParameter(CgGL.cgGetNamedParameter(fragmentProgram,
+                                                              "diffuseMap"));
+
+    ++curTime;
+  }
+
+
+  // Choose the vertex and fragment profiles to use.  Try to use
+  // CG_PROFILE_ARBVFP1 and CG_PROFILE_ARBFP1, depending on hardware support.
+  // If those aren't available, fall back to CG_PROFILE_VP30 and
+  // CG_PROFILE_FP30, respectively.
+
+  int /*CGprofile*/ vertexProfile, fragmentProfile;
+
+  void ChooseProfiles()
+  {
+    // Make sure that the appropriate profiles are available on the
+    // user's system.
+    if (CgGL.cgGLIsProfileSupported(CgGL.CG_PROFILE_ARBVP1))
+      vertexProfile = CgGL.CG_PROFILE_ARBVP1;
+    else {
+      // try VP30
+      if (CgGL.cgGLIsProfileSupported(CgGL.CG_PROFILE_VP30))
+        vertexProfile = CgGL.CG_PROFILE_VP30;
+      else {
+        System.out.println("Neither arbvp1 or vp30 vertex profiles supported on this system.\n");
+        System.exit(1);
+      }
+    }
+
+    if (CgGL.cgGLIsProfileSupported(CgGL.CG_PROFILE_ARBFP1))
+      fragmentProfile = CgGL.CG_PROFILE_ARBFP1;
+    else {
+      // try FP30
+      if (CgGL.cgGLIsProfileSupported(CgGL.CG_PROFILE_FP30))
+        fragmentProfile = CgGL.CG_PROFILE_FP30;
+      else {
+        System.out.println("Neither arbfp1 or fp30 fragment profiles supported on this system.\n");
+        System.exit(1);
+      }
+    }
+  }
+
+
+  void LoadCgPrograms()
+  {
+    assert(CgGL.cgIsContext(context));
+
+    // Load and compile the vertex program from demo_vert.cg; hold on to the
+    // handle to it that is returned.
+    vertexProgram = CgGL.cgCreateProgramFromFile(context, CgGL.CG_SOURCE, "demo_vert.cg",
+                                                 vertexProfile, null, null);
+    if (!CgGL.cgIsProgramCompiled(vertexProgram))
+      CgGL.cgCompileProgram(vertexProgram);
+
+    // Enable the appropriate vertex profile and load the vertex program.
+    CgGL.cgGLEnableProfile(vertexProfile);
+    CgGL.cgGLLoadProgram(vertexProgram);
+
+    // And similarly set things up for the fragment program.
+    fragmentProgram = CgGL.cgCreateProgramFromFile(context, CgGL.CG_SOURCE, "demo_frag.cg",
+                                                   fragmentProfile, null, null);
+    if (!CgGL.cgIsProgramCompiled(fragmentProgram)) {
+      CgGL.cgCompileProgram(fragmentProgram);
+    }
+    
+    CgGL.cgGLEnableProfile(fragmentProfile);
+    CgGL.cgGLLoadProgram(fragmentProgram);
+  }
+
+  void LoadTextures(GL gl)
+  {
+    // There is only one texture needed here--we'll set up a basic
+    // checkerboard--which is used to modulate the diffuse channel in the
+    // fragment shader.
+    int[] handle = new int[1];
+    gl.glGenTextures(1, handle);
+
+    // Basic OpenGL texture state setup
+    gl.glBindTexture(GL.GL_TEXTURE_2D, handle[0]);
+    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_GENERATE_MIPMAP_SGIS, GL.GL_TRUE);
+    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR_MIPMAP_LINEAR);
+    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
+    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
+    gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
+
+    // Fill in the texture map.
+    final int RES = 512;
+    float[] data = new float[RES*RES*4];
+    int dp = 0;
+    for (int i = 0; i < RES; ++i) {
+      for (int j = 0; j < RES; ++j) {
+        if ((i/32+j/32) % 2 != 0) {
+          data[dp++] = .7f;
+          data[dp++] = .7f;
+          data[dp++] = .7f;
+        }
+        else {
+          data[dp++] = .1f;
+          data[dp++] = .1f;
+          data[dp++] = .1f;
+        }
+        data[dp++] = 1.0f;
+      }
+    }
+
+    gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, RES, RES, 0, GL.GL_RGBA, GL.GL_FLOAT, data);
+
+    // Tell Cg which texture handle should be associated with the sampler2D
+    // parameter to the fragment shader.
+    CgGL.cgGLSetTextureParameter(CgGL.cgGetNamedParameter(fragmentProgram, "diffuseMap"),
+                                 handle[0]);
+  }
+  
+  private int VERTEX(int u, int v, int nu) { return (u + v * nu); }
+
+  // Geometry creation and drawing function; we'll just draw a sphere.
+
+  private static FloatBuffer P, N, uv;
+  private static IntBuffer indices;
+  void DrawGeometry(GL gl)
+  {
+    // Cache the sphere positions, normals, texture coordinates, and 
+    // vertex indices in a local array; we only need to fill them in the
+    // first time through this function.
+    int nu  = 30, nv = 30;
+    int nTris = 2*(nu-1)*(nv-1), nVerts = nu*nv;
+    if (P == null) {
+      int u, v;
+
+      P = BufferUtils.newFloatBuffer(3*nVerts);
+      N = BufferUtils.newFloatBuffer(3*nVerts);
+      uv = BufferUtils.newFloatBuffer(2*nVerts);
+
+      // Fill in the position, normal, and texture coordinate arrays.
+      // Just loop over all of the vertices, compute their parametreic
+      // (u,v) coordinates (which we use for texture coordinates as
+      // well), and call the ParametricEval() function, which turns (u,v)
+      // coordinates into positions and normals on the surface of the
+      // object.
+      int pp = 0, np = 0, uvp = 0;
+      for (v = 0; v < nv; ++v) {
+        float fv = (float)v / (float)(nv-1);
+        for (u = 0; u < nu; ++u) {
+          float fu = (float)u / (float)(nu-1);
+          uv.put(uvp, fu);
+          uv.put(uvp+1, fv);
+          ParametricEval(fu, fv, pp, P, np, N);
+          pp += 3;
+          np += 3;
+          uvp += 2;
+        }
+      }
+
+      // Now fill in the vertex index arrays
+      indices = BufferUtils.newIntBuffer(3*nTris);
+      int ip = 0;
+      for (v = 0; v < nv-1; ++v) {
+        for (u = 0; u < nu-1; ++u) {
+          indices.put(ip++, VERTEX(u, v, nu));
+          indices.put(ip++, VERTEX(u+1, v, nu));
+          indices.put(ip++, VERTEX(u+1, v+1, nu));
+
+          indices.put(ip++, VERTEX(u, v, nu));
+          indices.put(ip++, VERTEX(u+1, v+1, nu));
+          indices.put(ip++, VERTEX(u, v+1, nu));
+        }
+      }
+      // Tell Cg which of these data pointers are associated with which
+      // parameters to the vertex shader, so that when we call
+      // cgGLEnableClientState() and then glDrawElements(), the shader
+      // gets the right input information.
+      CGparameter param = CgGL.cgGetNamedParameter(vertexProgram, "Pobject");
+      CgGL.cgGLSetParameterPointer(param, 3, GL.GL_FLOAT, 0, P);
+      param = CgGL.cgGetNamedParameter(vertexProgram, "Nobject");
+      CgGL.cgGLSetParameterPointer(param, 3, GL.GL_FLOAT, 0, N);
+      param = CgGL.cgGetNamedParameter(vertexProgram, "TexUV");
+      CgGL.cgGLSetParameterPointer(param, 2, GL.GL_FLOAT, 0, uv);
+    }
+
+    // And now, each time through, enable the bindings to the parameters
+    // that we set up the first time through
+    CGparameter param = CgGL.cgGetNamedParameter(vertexProgram, "Pobject");
+    CgGL.cgGLEnableClientState(param);
+    param = CgGL.cgGetNamedParameter(vertexProgram, "Nobject");
+    CgGL.cgGLEnableClientState(param);
+    param = CgGL.cgGetNamedParameter(vertexProgram, "TexUV");
+    CgGL.cgGLEnableClientState(param);
+
+    // Enable the texture parameter as well.
+    param = CgGL.cgGetNamedParameter(fragmentProgram, "diffuseMap");
+    CgGL.cgGLEnableTextureParameter(param);
+
+    // And now, draw the geometry.
+    gl.glDrawElements(GL.GL_TRIANGLES, 3*nTris, GL.GL_UNSIGNED_INT, indices);
+
+    // Be a good citizen and disable the various bindings we set up above.
+    param = CgGL.cgGetNamedParameter(vertexProgram, "Pobject");
+    CgGL.cgGLDisableClientState(param);
+    param = CgGL.cgGetNamedParameter(vertexProgram, "Nobject");
+    CgGL.cgGLDisableClientState(param);
+    param = CgGL.cgGetNamedParameter(vertexProgram, "TexUV");
+    CgGL.cgGLDisableClientState(param);
+
+    param = CgGL.cgGetNamedParameter(fragmentProgram, "diffuseMap");
+    CgGL.cgGLDisableTextureParameter(param);
+  }
+
+  void ParametricEval(float u, float v, int offsetP, FloatBuffer p, int offsetN, FloatBuffer N)
+  {
+    float theta = (float)Math.PI * u, phi = (float)(2.0 * Math.PI * v);
+    P.put(offsetP + 0, (float)(Math.sin(theta) * Math.sin(phi)));
+    P.put(offsetP + 1, (float)(Math.sin(theta) * Math.cos(phi)));
+    P.put(offsetP + 2, (float)(Math.cos(theta)));
+
+    N.put(offsetN + 0, P.get(offsetP + 0));
+    N.put(offsetN + 1, P.get(offsetP + 1));
+    N.put(offsetN + 2, P.get(offsetP + 2));
+  }
+
+  public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged)
+  {
+    // nothing
+  }
+
+  public void reshape(GLDrawable drawable, int x, int y, int width, int height)
+  {
+    // do nothing
+  }
+
+}