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package com.sun.opengl.util.glsl;
import javax.media.opengl.*;
import java.util.HashMap;
import java.util.Iterator;
import java.nio.*;
import java.io.PrintStream;
public class ShaderProgram {
public ShaderProgram() {
id = getNextID();
}
public boolean linked() {
return programLinked;
}
public boolean inUse() {
return programInUse;
}
public int program() { return shaderProgram; }
/**
* returns the uniq shader id as an integer
* @see #key()
*/
public int id() { return id.intValue(); }
/**
* returns the uniq shader id as an Integer
*
* @see #id()
*/
public Integer key() { return id; }
/**
* Detaches all shader codes and deletes the program.
* Destroys the shader codes as well.
* Calls release(gl, true)
*
* @see #release(GL2ES2, boolean)
*/
public synchronized void destroy(GL2ES2 gl) {
release(gl, true);
}
/**
* Detaches all shader codes and deletes the program.
* Calls release(gl, false)
*
* @see #release(GL2ES2, boolean)
*/
public synchronized void release(GL2ES2 gl) {
release(gl, false);
}
/**
* Detaches all shader codes and deletes the program.
* If releaseShaderToo is true, destroys the shader codes as well.
*/
public synchronized void release(GL2ES2 gl, boolean releaseShaderToo) {
glUseProgram(gl, false);
for(Iterator iter=shaderMap.values().iterator(); iter.hasNext(); ) {
ShaderCode shaderCode = (ShaderCode) iter.next();
gl.glDetachShader(shaderProgram, shaderCode.shader());
if(releaseShaderToo) {
shaderCode.destroy(gl);
}
}
shaderMap.clear();
gl.glDeleteProgram(shaderProgram);
shaderProgram=-1;
}
//
// ShaderCode handling
//
/**
* Adds a new shader to a this non running program.
*
* @return false if the program is in use, or the shader already exist,
* otherwise true.
*/
public synchronized boolean add(ShaderCode shaderCode) {
if(shaderMap.containsKey(shaderCode.key())) return false;
shaderMap.put(shaderCode.key(), shaderCode);
return true;
}
public synchronized ShaderCode getShader(int id) {
return (ShaderCode) shaderMap.get(new Integer(id));
}
//
// Program handling
//
/**
* Replace a shader in a 'running' program.
* Refetches all previously bin/get attribute names
* and resets all attribute data as well
*
* @see getAttribLocation
* @param gl
* @param oldShaderID the to be replace Shader
* @param newShader the new ShaderCode
* @param verboseOut the optional verbose outputstream
* @throws GLException is the program is not linked
*
* @see #glRefetchAttribLocations
* @see #glResetAllVertexAttributes
* @see #glReplaceShader
*/
public synchronized boolean glReplaceShader(GL2ES2 gl, int oldShaderID, ShaderCode newShader, PrintStream verboseOut) {
if(!programLinked) throw new GLException("Program is not linked");
boolean shaderWasInUse = programInUse;
glUseProgram(gl, false);
if(!newShader.compile(gl, verboseOut)) {
return false;
}
if(oldShaderID>=0) {
ShaderCode oldShader = (ShaderCode) shaderMap.remove(new Integer(oldShaderID));
if(null!=oldShader) {
gl.glDetachShader(shaderProgram, oldShader.shader());
}
}
add(newShader);
gl.glAttachShader(shaderProgram, newShader.shader());
gl.glLinkProgram(shaderProgram);
if ( ! gl.glIsProgramValid(shaderProgram, System.err) ) {
return false;
}
if(shaderWasInUse) {
glUseProgram(gl, true);
}
return true;
}
public synchronized boolean link(GL2ES2 gl, PrintStream verboseOut) {
if(programLinked) throw new GLException("Program is already linked");
if(0>shaderProgram) {
shaderProgram = gl.glCreateProgram();
}
for(Iterator iter=shaderMap.values().iterator(); iter.hasNext(); ) {
ShaderCode shaderCode = (ShaderCode) iter.next();
if(!shaderCode.compile(gl, verboseOut)) {
return false;
}
gl.glAttachShader(shaderProgram, shaderCode.shader());
}
// Link the program
gl.glLinkProgram(shaderProgram);
programLinked = gl.glIsProgramValid(shaderProgram, System.err);
return programLinked;
}
public boolean equals(Object obj) {
if(this==obj) return true;
if(obj instanceof ShaderCode) {
return id()==((ShaderCode)obj).id();
}
return false;
}
public int hashCode() {
return id.intValue();
}
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append("ShaderProgram[id="+id);
buf.append(", linked="+programLinked+", inUse="+programInUse+", program: "+shaderProgram+", [");
for(Iterator iter=shaderMap.values().iterator(); iter.hasNext(); ) {
buf.append((ShaderCode) iter.next());
buf.append(" ");
}
buf.append("]");
return buf.toString();
}
protected synchronized void glUseProgram(GL2ES2 gl, boolean on) {
if(!programLinked) throw new GLException("Program is not linked");
if(programInUse==on) return;
gl.glUseProgram(on?shaderProgram:0);
programInUse = on;
//Throwable tX = new Throwable("Info: ShaderProgram.glUseProgram: "+on);
//tX.printStackTrace();
}
protected boolean programLinked = false;
protected boolean programInUse = false;
protected int shaderProgram=-1;
protected HashMap shaderMap = new HashMap();
protected Integer id = null;
private static synchronized Integer getNextID() {
return new Integer(nextID++);
}
protected static int nextID = 1;
}
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