1 files changed, 508 insertions, 0 deletions
diff --git a/src/net/java/joglutils/msg/misc/Shader.java b/src/net/java/joglutils/msg/misc/Shader.java
new file mode 100644
index 0000000..c816629
--- /dev/null
+++ b/src/net/java/joglutils/msg/misc/Shader.java
@@ -0,0 +1,508 @@
+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution 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.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ */
+
+package net.java.joglutils.msg.misc;
+
+import javax.media.opengl.GL;
+import javax.media.opengl.GLException;
+import javax.media.opengl.glu.GLU;
+import static javax.media.opengl.GL.*;
+
+/**
+ * Represents an OpenGL shader program object, which can be constructed from
+ * the source code for a vertex shader, a fragment shader, or both.
+ * Contains convenience methods for enabling/disabling shader state.
+ * <p>
+ * Usage example:
+ * <pre>
+ *     String source =
+ *         "uniform sampler2D myTex;" +
+ *         "void main(void)" +
+ *         "{" +
+ *         "    vec4 src = texture2D(myTex, gl_TexCoord[0].st);" +
+ *         "    gl_FragColor = src.bgra;" + // swizzle!
+ *         "}";
+ *     Shader shader = new Shader(source);
+ *     shader.setUniform("myTex", 0); // myTex will be on texture unit 0
+ *     ...
+ *     shader.enable();
+ *     texture.enable();
+ *     texture.bind();
+ *     ...
+ *     texture.disable();
+ *     shader.disable();
+ * };
+ * </pre>
+ *
+ * @author Chris Campbell
+ */
+public class Shader {
+    
+    /**
+     * The handle to the OpenGL fragment program object.
+     */
+    private int id;
+    
+    /**
+     * Creates a new shader program object and compiles/links the provided
+     * fragment shader code into that object.
+     * 
+     * @param fragmentCode a {@code String} representing the fragment shader
+     * source code to be compiled and linked
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public Shader(String fragmentCode)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        id = createProgram(gl, null, fragmentCode);
+    }
+    
+    /**
+     * Creates a new shader program object and compiles/links the provided
+     * vertex shader and fragment shader code into that object.
+     * 
+     * @param vertexCode a {@code String} representing the vertex shader
+     * source code to be compiled and linked; this may be null if only a
+     * fragment shader is going to be needed
+     * @param fragmentCode a {@code String} representing the fragment shader
+     * source code to be compiled and linked; this may be null if only a
+     * vertex shader is going to be needed
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public Shader(String vertexCode, String fragmentCode)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        id = createProgram(gl, vertexCode, fragmentCode);
+    }
+    
+    /**
+     * Compiles and links a new shader program using the given sources.  If
+     * successful, this function returns a handle to the newly created shader
+     * program; otherwise returns 0.
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    private static int createProgram(GL gl,
+                                     String vertexShaderSource,
+                                     String fragmentShaderSource)
+        throws GLException
+    {
+        if (vertexShaderSource == null && fragmentShaderSource == null) {
+            throw new GLException(
+                "Either vertexShaderSource or fragmentShaderSource " +
+                "must be specified");
+        }
+        
+        int shaderProgram;
+        int vertexShader = 0;
+        int fragmentShader = 0;
+        int[] success = new int[1];
+        int[] infoLogLength = new int[1];
+
+        if (vertexShaderSource != null) {
+            vertexShader = compileShader(gl, vertexShaderSource, true);
+            if (vertexShader == 0) {
+                return 0;
+            }
+        }
+        
+        if (fragmentShaderSource != null) {
+            fragmentShader = compileShader(gl, fragmentShaderSource, false);
+            if (fragmentShader == 0) {
+                if (vertexShader != 0) {
+                    gl.glDeleteObjectARB(vertexShader);
+                }
+                return 0;
+            }
+        }
+
+        // create the program object and attach it to the shader
+        shaderProgram = gl.glCreateProgramObjectARB();
+        if (vertexShader != 0) {
+            gl.glAttachObjectARB(shaderProgram, vertexShader);
+            // it is now safe to delete the shader object
+            gl.glDeleteObjectARB(vertexShader);
+        }
+        if (fragmentShader != 0) {
+            gl.glAttachObjectARB(shaderProgram, fragmentShader);
+            // it is now safe to delete the shader object
+            gl.glDeleteObjectARB(fragmentShader);
+        }
+
+        // link the program
+        gl.glLinkProgramARB(shaderProgram);
+        gl.glGetObjectParameterivARB(shaderProgram,
+                                     GL_OBJECT_LINK_STATUS_ARB,
+                                     success, 0);
+
+        // print the linker messages, if necessary
+        gl.glGetObjectParameterivARB(shaderProgram,
+                                     GL_OBJECT_INFO_LOG_LENGTH_ARB,
+                                     infoLogLength, 0);
+        if (infoLogLength[0] > 1) {
+            byte[] infoLog = new byte[1024];
+            gl.glGetInfoLogARB(shaderProgram, 1024, null, 0, infoLog, 0);
+            System.err.println("Linker message: " +
+                               new String(infoLog));
+        }
+
+        if (success[0] == 0) {
+            gl.glDeleteObjectARB(shaderProgram);
+            return 0;
+        }
+
+        return shaderProgram;
+    }
+    
+    /**
+     * Compiles the given shader program.  If successful, this function returns
+     * a handle to the newly created shader object; otherwise returns 0.
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    private static int compileShader(GL gl, String shaderSource, boolean vertex)
+        throws GLException
+    {
+        int kind = vertex ? GL_VERTEX_SHADER_ARB : GL_FRAGMENT_SHADER_ARB;
+        int shader;
+        int[] success = new int[1];
+        int[] infoLogLength = new int[1];
+        
+        // create the shader object and compile the shader source code
+        shader = gl.glCreateShaderObjectARB(kind);
+        gl.glShaderSourceARB(shader, 1, new String[] { shaderSource }, null, 0);
+        gl.glCompileShaderARB(shader);
+        gl.glGetObjectParameterivARB(shader,
+                                     GL_OBJECT_COMPILE_STATUS_ARB,
+                                     success, 0);
+
+        // print the compiler messages, if necessary
+        gl.glGetObjectParameterivARB(shader,
+                                     GL_OBJECT_INFO_LOG_LENGTH_ARB,
+                                     infoLogLength, 0);
+        if (infoLogLength[0] > 1) {
+            byte[] infoLog = new byte[1024];
+            gl.glGetInfoLogARB(shader, 1024, null, 0, infoLog, 0);
+            System.err.println((vertex ? "Vertex" : "Fragment") +
+                               " compile message: " +
+                               new String(infoLog));
+        }
+
+        if (success[0] == 0) {
+            gl.glDeleteObjectARB(shader);
+            return 0;
+        }
+        
+        return shader;
+    }
+    
+    /**
+     * Returns the underlying OpenGL program object handle for this fragment
+     * shader. Most applications will not need to access this, since it is
+     * handled automatically by the enable() and dispose() methods.
+     * 
+     * @return the OpenGL program object handle for this fragment shader
+     */
+    public int getProgramObject() {
+        return id;
+    }
+    
+    /**
+     * Enables this shader program in the current GL context's state.
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void enable() throws GLException {
+        GL gl = GLU.getCurrentGL();
+        gl.glUseProgramObjectARB(id);
+    }
+    
+    /**
+     * Disables this shader program in the current GL context's state.
+     * 
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void disable() throws GLException {
+        GL gl = GLU.getCurrentGL();
+        gl.glUseProgramObjectARB(0);
+    }
+    
+    /**
+     * Disposes the native resources used by this program object.
+     *
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void dispose() throws GLException {
+        GL gl = GLU.getCurrentGL();
+        gl.glDeleteObjectARB(id);
+        id = 0;
+    }
+
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * integer value.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param i0 the first uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, int i0)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform1iARB(loc, i0);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * integer values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param i0 the first uniform parameter
+     * @param i1 the second uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, int i0, int i1)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform2iARB(loc, i0, i1);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * integer values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param i0 the first uniform parameter
+     * @param i1 the second uniform parameter
+     * @param i2 the third uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, int i0, int i1, int i2)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform3iARB(loc, i0, i1, i2);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * integer values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param i0 the first uniform parameter
+     * @param i1 the second uniform parameter
+     * @param i2 the third uniform parameter
+     * @param i3 the fourth uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, int i0, int i1, int i2, int i3)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform4iARB(loc, i0, i1, i2, i3);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * float value.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param f0 the first uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, float f0)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform1fARB(loc, f0);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * float values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param f0 the first uniform parameter
+     * @param f1 the second uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, float f0, float f1)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform2fARB(loc, f0, f1);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * float values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param f0 the first uniform parameter
+     * @param f1 the second uniform parameter
+     * @param f2 the third uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, float f0, float f1, float f2)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform3fARB(loc, f0, f1, f2);
+    }
+    
+    /**
+     * Sets the uniform variable of the given name with the provided
+     * float values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param f0 the first uniform parameter
+     * @param f1 the second uniform parameter
+     * @param f2 the third uniform parameter
+     * @param f3 the fourth uniform parameter
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniform(String name, float f0, float f1, float f2, float f3)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform4fARB(loc, f0, f1, f2, f3);
+    }
+    
+    /**
+     * Sets the uniform array variable of the given name with the provided
+     * float array values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param count the number of float elements in the array
+     * @param vals the array values to be set
+     * @param off the offset into the vals array
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniformArray1f(String name, int count, float[] vals, int off)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform1fvARB(loc, count, vals, off);
+    }
+    
+    /**
+     * Sets the uniform array variable of the given name with the provided
+     * float array values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param count the number of vec2 elements in the array
+     * @param vals the array values to be set
+     * @param off the offset into the vals array
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniformArray2f(String name, int count, float[] vals, int off)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform2fvARB(loc, count, vals, off);
+    }
+    
+    /**
+     * Sets the uniform array variable of the given name with the provided
+     * float array values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param count the number of vec3 elements in the array
+     * @param vals the array values to be set
+     * @param off the offset into the vals array
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniformArray3f(String name, int count, float[] vals, int off)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform3fvARB(loc, count, vals, off);
+    }
+    
+    /**
+     * Sets the uniform array variable of the given name with the provided
+     * float array values.
+     *
+     * @param name the name of the uniform variable to be set
+     * @param count the number of vec4 elements in the array
+     * @param vals the array values to be set
+     * @param off the offset into the vals array
+     * @throws GLException if no OpenGL context was current or if any
+     * OpenGL-related errors occurred
+     */
+    public void setUniformArray4f(String name, int count, float[] vals, int off)
+        throws GLException
+    {
+        GL gl = GLU.getCurrentGL();
+        int loc = gl.glGetUniformLocationARB(id, name);
+        gl.glUniform4fvARB(loc, count, vals, off);
+    }
+}