/**
* Validates and returns the location of a shader attribute.<br>
* Uses either the cached value {@link #getCachedAttribLocation(String)} if valid, or the GLSL
* queried via {@link GL2ES2#glGetAttribLocation(int, String)}.<br>
* The location will be cached and set in the {@link GLArrayData} object.
*
* @return -1 if there is no such attribute available, otherwise >= 0
* @throws GLException if no program is attached
* @throws GLException if the program is not linked and no location was cached.
* @see #getCachedAttribLocation(String)
* @see #bindAttribLocation(GL2ES2, int, GLArrayData)
* @see #bindAttribLocation(GL2ES2, int, String)
* @see GL2ES2#glGetAttribLocation(int, String)
* @see #getAttribute(String)
*/
public int getAttribLocation(GL2ES2 gl, GLArrayData data) {
if (null == shaderProgram) throw new GLException("No program is attached");
final String name = data.getName();
int location = getCachedAttribLocation(name);
if (0 <= location) {
data.setLocation(location);
} else {
if (!shaderProgram.linked()) throw new GLException("Program is not linked");
location = data.setLocation(gl, shaderProgram.program());
if (0 <= location) {
Integer idx = new Integer(location);
activeAttribLocationMap.put(name, idx);
if (DEBUG) {
System.err.println("ShaderState: glGetAttribLocation: " + name + ", loc: " + location);
}
} else if (verbose) {
System.err.println(
"ShaderState: glGetAttribLocation failed, no location for: "
+ name
+ ", loc: "
+ location);
if (DEBUG) {
Thread.dumpStack();
}
}
}
activeAttribDataMap.put(data.getName(), data);
return location;
}
/**
* Enables a vertex attribute array, usually invoked by {@link
* GLArrayDataEditable#enableBuffer(GL, boolean)}.
*
* <p>This method uses the {@link GLArrayData}'s location if set and is the preferred alternative
* to {@link #enableVertexAttribArray(GL2ES2, String)}. If data location is unset it will be
* retrieved via {@link #getAttribLocation(GL2ES2, GLArrayData)} set and cached in this state.
*
* <p>Even if the attribute is not found in the current shader, it is marked enabled in this
* state.
*
* @return false, if the name is not found, otherwise true
* @throws GLException if the program is not linked and no location was cached.
* @see #glEnableVertexAttribArray
* @see #glDisableVertexAttribArray
* @see #glVertexAttribPointer
* @see #getVertexAttribPointer
* @see GLArrayDataEditable#enableBuffer(GL, boolean)
*/
public boolean enableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
if (0 > data.getLocation()) {
getAttribLocation(gl, data);
} else {
// ensure data is the current bound one
activeAttribDataMap.put(data.getName(), data);
}
return enableVertexAttribArray(gl, data.getName(), data.getLocation());
}
/**
* Binds a shader {@link GLArrayData} attribute to a location. Multiple names can be bound to one
* location. The value will be cached and can be retrieved via {@link
* #getCachedAttribLocation(String)} and {@link #getAttribute(String)}before or after linking. The
* {@link GLArrayData}'s location will be set as well.
*
* @throws GLException if no program is attached
* @throws GLException if the program is already linked
* @see javax.media.opengl.GL2ES2#glBindAttribLocation(int, int, String)
* @see #getAttribLocation(GL2ES2, String)
* @see #getCachedAttribLocation(String)
* @see #getAttribute(String)
*/
public void bindAttribLocation(GL2ES2 gl, int location, GLArrayData data) {
if (null == shaderProgram) throw new GLException("No program is attached");
if (shaderProgram.linked()) throw new GLException("Program is already linked");
final String name = data.getName();
final Integer loc = new Integer(location);
activeAttribLocationMap.put(name, loc);
data.setLocation(gl, shaderProgram.program(), location);
activeAttribDataMap.put(data.getName(), data);
}
/**
* Binds or unbinds the {@link GLArrayData} lifecycle to this ShaderState.
*
* <p>If an attribute location is cached (ie {@link #bindAttribLocation(GL2ES2, int, String)}) it
* is promoted to the {@link GLArrayData} instance.
*
* <p>The attribute will be destroyed with {@link #destroy(GL2ES2)} and it's location will be
* reset when switching shader with {@link #attachShaderProgram(GL2ES2, ShaderProgram)}.
*
* <p>The data will not be transfered to the GPU, use {@link #vertexAttribPointer(GL2ES2,
* GLArrayData)} additionally.
*
* <p>The data will also be {@link GLArrayData#associate(Object, boolean) associated} with this
* ShaderState.
*
* @param attribute the {@link GLArrayData} which lifecycle shall be managed
* @param own true if <i>owning</i> shall be performs, false if <i>disowning</i>.
* @see #bindAttribLocation(GL2ES2, int, String)
* @see #getAttribute(String)
* @see GLArrayData#associate(Object, boolean)
*/
public void ownAttribute(GLArrayData attribute, boolean own) {
if (own) {
final int location = getCachedAttribLocation(attribute.getName());
if (0 <= location) {
attribute.setLocation(location);
}
managedAttributes.add(managedAttributes.size(), attribute);
} else {
managedAttributes.remove(attribute);
}
attribute.associate(this, own);
}
private final void relocateAttribute(GL2ES2 gl, GLArrayData attribute) {
// get new location ..
final String name = attribute.getName();
final int loc = getAttribLocation(gl, name);
attribute.setLocation(loc);
if (0 <= loc) {
if (isVertexAttribArrayEnabled(name)) {
// enable attrib, VBO and pass location/data
gl.glEnableVertexAttribArray(loc);
}
if (attribute.isVBO()) {
gl.glBindBuffer(GL.GL_ARRAY_BUFFER, attribute.getVBOName());
gl.glVertexAttribPointer(attribute);
gl.glBindBuffer(GL.GL_ARRAY_BUFFER, 0);
} else {
gl.glVertexAttribPointer(attribute);
}
}
}
/**
* Disables a vertex attribute array
*
* <p>This method uses the {@link GLArrayData}'s location if set and is the preferred alternative
* to {@link #disableVertexAttribArray(GL2ES2, String)}. If data location is unset it will be
* retrieved via {@link #getAttribLocation(GL2ES2, GLArrayData)} set and cached in this state.
*
* <p>Even if the attribute is not found in the current shader, it is removed from this state
* enabled list.
*
* @return false, if the name is not found, otherwise true
* @throws GLException if no program is attached
* @throws GLException if the program is not linked and no location was cached.
* @see #glEnableVertexAttribArray
* @see #glDisableVertexAttribArray
* @see #glVertexAttribPointer
* @see #getVertexAttribPointer
*/
public boolean disableVertexAttribArray(GL2ES2 gl, GLArrayData data) {
if (0 > data.getLocation()) {
getAttribLocation(gl, data);
}
return disableVertexAttribArray(gl, data.getName(), data.getLocation());
}
/** @return true if the {@link GLArrayData} attribute is enable */
public final boolean isVertexAttribArrayEnabled(GLArrayData data) {
return isVertexAttribArrayEnabled(data.getName());
}
public boolean isActiveAttribute(GLArrayData attribute) {
return attribute == activeAttribDataMap.get(attribute.getName());
}
