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package net.java.games.jogl.impl.macosx;
import net.java.games.jogl.*;
import net.java.games.jogl.impl.*;
public class MacOSXPbufferGLContext extends MacOSXGLContext {
private static final boolean DEBUG = Debug.debug("MacOSXPbufferGLContext");
protected int initWidth;
protected int initHeight;
private long pBuffer;
protected int width;
protected int height;
// State for render-to-texture and render-to-texture-rectangle support
private boolean created;
private int textureTarget; // e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_NV
private int texture; // actual texture object
public MacOSXPbufferGLContext(GLCapabilities capabilities, int initialWidth, int initialHeight) {
super(null, capabilities, null, null);
this.initWidth = initialWidth;
this.initHeight = initialHeight;
}
public boolean canCreatePbufferContext() {
return false;
}
public GLContext createPbufferContext(GLCapabilities capabilities,
int initialWidth,
int initialHeight) {
throw new GLException("Not supported");
}
public void bindPbufferToTexture() {
GL gl = getGL();
gl.glBindTexture(textureTarget, texture);
// FIXME: not clear whether this is really necessary, but since
// the API docs seem to imply it is and since it doesn't seem to
// impact performance, leaving it in
CGL.setContextTextureImageToPBuffer(nsContext, pBuffer, GL.GL_FRONT);
}
public void releasePbufferFromTexture() {
}
public void createPbuffer(long parentView, long parentContext) {
GL gl = getGL();
// Must initally grab OpenGL function pointers while parent's
// context is current because otherwise we don't have the cgl
// extensions available to us
resetGLFunctionAvailability();
int renderTarget;
if (capabilities.getOffscreenRenderToTextureRectangle()) {
width = initWidth;
height = initHeight;
renderTarget = GL.GL_TEXTURE_RECTANGLE_EXT;
} else {
width = getNextPowerOf2(initWidth);
height = getNextPowerOf2(initHeight);
renderTarget = GL.GL_TEXTURE_2D;
}
this.pBuffer = CGL.createPBuffer(renderTarget, width, height);
if (this.pBuffer == 0) {
throw new GLException("pbuffer creation error: CGL.createPBuffer() failed");
}
if (DEBUG) {
System.err.println("Created pbuffer " + width + " x " + height);
}
}
protected synchronized boolean makeCurrent(Runnable initAction) throws GLException {
created = false;
if (pBuffer == 0) {
// pbuffer not instantiated yet
return false;
}
boolean res = super.makeCurrent(initAction);
if (created) {
// Initialize render-to-texture support if requested
boolean rect = capabilities.getOffscreenRenderToTextureRectangle();
GL gl = getGL();
if (rect) {
if (!gl.isExtensionAvailable("GL_EXT_texture_rectangle")) {
System.err.println("MacOSXPbufferGLContext: WARNING: GL_EXT_texture_rectangle extension not " +
"supported; skipping requested render_to_texture_rectangle support for pbuffer");
rect = false;
}
}
textureTarget = (rect ? GL.GL_TEXTURE_RECTANGLE_EXT : GL.GL_TEXTURE_2D);
int[] tmp = new int[1];
gl.glGenTextures(1, tmp);
texture = tmp[0];
gl.glBindTexture(textureTarget, texture);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
gl.glCopyTexImage2D(textureTarget, 0, GL.GL_RGB, 0, 0, width, height, 0);
}
return res;
}
public void destroyPBuffer() {
if (this.pBuffer != 0) {
CGL.destroyPBuffer(nsContext, pBuffer);
}
this.pBuffer = 0;
if (DEBUG) {
System.err.println("Destroyed pbuffer " + width + " x " + height);
}
}
public void handleModeSwitch(long parentView, long parentContext) {
throw new GLException("Not yet implemented");
}
protected boolean isOffscreen() {
// FIXME: currently the only caller of this won't cause proper
// resizing of the pbuffer anyway.
return false;
}
protected void destroyImpl() throws GLException {
destroyPBuffer();
}
public void swapBuffers() throws GLException {
// FIXME: do we need to do anything if the pbuffer is double-buffered?
}
private int getNextPowerOf2(int number) {
if (((number-1) & number) == 0) {
//ex: 8 -> 0b1000; 8-1=7 -> 0b0111; 0b1000&0b0111 == 0
return number;
}
int power = 0;
while (number > 0) {
number = number>>1;
power++;
}
return (1<<power);
}
protected void create() {
super.create();
created = true;
// Must now associate the pbuffer with our newly-created context
CGL.setContextPBuffer(nsContext, pBuffer);
}
}
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