/**
* Replace a shader in a program and re-links the program.
*
* @param gl
* @param oldShader the to be replace Shader
* @param newShader the new ShaderCode
* @param verboseOut the optional verbose output stream
* @return true if all steps are valid, shader compilation, attachment and linking; otherwise
* false.
* @see ShaderState#glEnableVertexAttribArray
* @see ShaderState#glDisableVertexAttribArray
* @see ShaderState#glVertexAttribPointer
* @see ShaderState#getVertexAttribPointer
* @see ShaderState#glReleaseAllVertexAttributes
* @see ShaderState#glResetAllVertexAttributes
* @see ShaderState#glResetAllVertexAttributes
* @see ShaderState#glResetAllVertexAttributes
*/
public synchronized boolean replaceShader(
GL2ES2 gl, ShaderCode oldShader, ShaderCode newShader, PrintStream verboseOut) {
if (!init(gl) || !newShader.compile(gl, verboseOut)) {
return false;
}
boolean shaderWasInUse = inUse();
if (shaderWasInUse) {
useProgram(gl, false);
}
if (null != oldShader && allShaderCode.remove(oldShader)) {
if (attachedShaderCode.remove(oldShader)) {
ShaderUtil.detachShader(gl, shaderProgram, oldShader.shader());
}
}
add(newShader);
if (attachedShaderCode.add(newShader)) {
ShaderUtil.attachShader(gl, shaderProgram, newShader.shader());
}
gl.glLinkProgram(shaderProgram);
programLinked = ShaderUtil.isProgramLinkStatusValid(gl, shaderProgram, System.err);
if (programLinked && shaderWasInUse) {
useProgram(gl, true);
}
return programLinked;
}
/**
* Adds a new shader to a this non running program.
*
* <p>Compiles and attaches the shader, if not done yet.
*
* @return true if the shader was successfully added, false if compilation failed.
*/
public synchronized boolean add(GL2ES2 gl, ShaderCode shaderCode, PrintStream verboseOut) {
if (!init(gl)) {
return false;
}
if (allShaderCode.add(shaderCode)) {
if (!shaderCode.compile(gl, verboseOut)) {
return false;
}
if (attachedShaderCode.add(shaderCode)) {
ShaderUtil.attachShader(gl, shaderProgram, shaderCode.shader());
}
}
return true;
}
/**
* Links the shader code to the program.
*
* <p>Compiles and attaches the shader code to the program if not done by yet
*
* <p>Within this process, all GL resources (shader and program objects) are created if necessary.
*
* @param gl
* @param verboseOut
* @return true if program was successfully linked and is valid, otherwise false
* @see #init(GL2ES2)
*/
public synchronized boolean link(GL2ES2 gl, PrintStream verboseOut) {
if (!init(gl)) {
programLinked = false; // mark unlinked due to user attempt to [re]link
return false;
}
for (Iterator<ShaderCode> iter = allShaderCode.iterator(); iter.hasNext(); ) {
final ShaderCode shaderCode = iter.next();
if (!shaderCode.compile(gl, verboseOut)) {
programLinked = false; // mark unlinked due to user attempt to [re]link
return false;
}
if (attachedShaderCode.add(shaderCode)) {
ShaderUtil.attachShader(gl, shaderProgram, shaderCode.shader());
}
}
// Link the program
gl.glLinkProgram(shaderProgram);
programLinked = ShaderUtil.isProgramLinkStatusValid(gl, shaderProgram, System.err);
return programLinked;
}