org.lwjgl.opengl.Pbuffer Java Examples

PbufferRenderer(int width, int height, PixelFormat format, boolean use_copyteximage, OffscreenRendererFactory factory) throws LWJGLException {
	super(width, height, use_copyteximage);
	this.factory = factory;
	pbuffer = new Pbuffer(width, height, format, null, null);
	GLStateStack state_stack = new GLStateStack();
	pbuffer.makeCurrent();
	GLStateStack.setCurrent(state_stack);
	try {
		pbuffer.makeCurrent();
		Renderer.dumpWindowInfo();
		init();
		if (!GLUtils.getGLBoolean(GL11.GL_DOUBLEBUFFER)) {
			GL11.glReadBuffer(GL11.GL_FRONT);
			GL11.glDrawBuffer(GL11.GL_FRONT);
		}
	} catch (LWJGLException e) {
		pbuffer.destroy();
		throw e;
	}
}
 

/**
 * Initialise the PBuffer that will be used to render to
 * 
 * @throws SlickException
 */
private void init() throws SlickException {
	try {
		Texture tex = InternalTextureLoader.get().createTexture(image.getWidth(), image.getHeight(), image.getFilter());
		
		final RenderTexture rt = new RenderTexture(false, true, false, false, RenderTexture.RENDER_TEXTURE_2D, 0);
		pbuffer = new Pbuffer(screenWidth, screenHeight, new PixelFormat(8, 0, 0), rt, null);

		// Initialise state of the pbuffer context.
		pbuffer.makeCurrent();

		initGL();
		GL.glBindTexture(GL11.GL_TEXTURE_2D, tex.getTextureID());
		pbuffer.releaseTexImage(Pbuffer.FRONT_LEFT_BUFFER);
		image.draw(0,0);
		image.setTexture(tex);
		
		Display.makeCurrent();
	} catch (Exception e) {
		Log.error(e);
		throw new SlickException("Failed to create PBuffer for dynamic image. OpenGL driver failure?");
	}
}
 

/**
 * @see org.newdawn.slick.Graphics#disable()
 */
protected void disable() {
	GL.flush();
	
	// Bind the texture after rendering.
	GL.glBindTexture(GL11.GL_TEXTURE_2D, image.getTexture().getTextureID());
	pbuffer.bindTexImage(Pbuffer.FRONT_LEFT_BUFFER);
	
	try {
		Display.makeCurrent();
	} catch (LWJGLException e) {
		Log.error(e);
	}
	
	SlickCallable.leaveSafeBlock();
}
 

/**
 * @see org.newdawn.slick.Graphics#enable()
 */
protected void enable() {
	SlickCallable.enterSafeBlock();
	
	try {
		if (pbuffer.isBufferLost()) {
			pbuffer.destroy();
			init();
		}

		pbuffer.makeCurrent();
	} catch (Exception e) {
		Log.error("Failed to recreate the PBuffer");
		throw new RuntimeException(e);
	}
	
	// Put the renderer contents to the texture
	GL.glBindTexture(GL11.GL_TEXTURE_2D, image.getTexture().getTextureID());
	pbuffer.releaseTexImage(Pbuffer.FRONT_LEFT_BUFFER);
	TextureImpl.unbind();
	initGL();
}
 

/**
 * Initialise offscreen rendering by checking what buffers are supported
 * by the card
 * 
 * @throws SlickException Indicates no buffers are supported
 */
private static void init() throws SlickException {
	init = true;
	
	if (fbo) {
		fbo = GLContext.getCapabilities().GL_EXT_framebuffer_object;
	}
	pbuffer = (Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) != 0;
	pbufferRT = (Pbuffer.getCapabilities() & Pbuffer.RENDER_TEXTURE_SUPPORTED) != 0;
	
	if (!fbo && !pbuffer && !pbufferRT) {
		throw new SlickException("Your OpenGL card does not support offscreen buffers and hence can't handle the dynamic images required for this application.");
	}
	
	Log.info("Offscreen Buffers FBO="+fbo+" PBUFFER="+pbuffer+" PBUFFERRT="+pbufferRT);
}
 

/**
 * Initialise the PBuffer that will be used to render to
 * 
 * @throws SlickException
 */
private void init() throws SlickException {
	try {
		Texture tex = InternalTextureLoader.get().createTexture(image.getWidth(), image.getHeight(), image.getFilter());

		pbuffer = new Pbuffer(screenWidth, screenHeight, new PixelFormat(8, 0, 0), null, null);
		// Initialise state of the pbuffer context.
		pbuffer.makeCurrent();

		initGL();
		image.draw(0,0);
		GL11.glBindTexture(GL11.GL_TEXTURE_2D, tex.getTextureID());
		GL11.glCopyTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, 0, 0, 
							  tex.getTextureWidth(), 
							  tex.getTextureHeight(), 0);
		image.setTexture(tex);
		
		Display.makeCurrent();
	} catch (Exception e) {
		Log.error(e);
		throw new SlickException("Failed to create PBuffer for dynamic image. OpenGL driver failure?");
	}
}
 

/**
 * Enable shared OpenGL context. After calling this all containers created 
 * will shared a single parent context
 * 
 * @throws SlickException Indicates a failure to create the shared drawable
 */
public static void enableSharedContext() throws SlickException {
	try {
		SHARED_DRAWABLE = new Pbuffer(64, 64, new PixelFormat(8, 0, 0), null);
	} catch (LWJGLException e) {
		throw new SlickException("Unable to create the pbuffer used for shard context, buffers not supported", e);
	}
}
 

/**
 * Enable shared OpenGL context. After calling this all containers created 
 * will shared a single parent context
 * 
 * @throws SlickException Indicates a failure to create the shared drawable
 */
public static void enableSharedContext() throws SlickException {
	try {
		SHARED_DRAWABLE = new Pbuffer(64, 64, new PixelFormat(8, 0, 0), null);
	} catch (LWJGLException e) {
		throw new SlickException("Unable to create the pbuffer used for shard context, buffers not supported", e);
	}
}
 

/**
 * Create a new graphics context around a pbuffer
 * 
 * @param image The image we're rendering to
 * @throws SlickException Indicates a failure to use pbuffers
 */
public PBufferGraphics(Image image) throws SlickException {
	super(image.getTexture().getTextureWidth(), image.getTexture().getTextureHeight());
	this.image = image;
	
	Log.debug("Creating pbuffer(rtt) "+image.getWidth()+"x"+image.getHeight());
	if ((Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) == 0) {
		throw new SlickException("Your OpenGL card does not support PBuffers and hence can't handle the dynamic images required for this application.");
	}
	if ((Pbuffer.getCapabilities() & Pbuffer.RENDER_TEXTURE_SUPPORTED) == 0) {
		throw new SlickException("Your OpenGL card does not support Render-To-Texture and hence can't handle the dynamic images required for this application.");
	}

	init();
}
 

/**
 * Create a new graphics context around a pbuffer
 * 
 * @param image The image we're rendering to
 * @throws SlickException Indicates a failure to use pbuffers
 */
public PBufferUniqueGraphics(Image image) throws SlickException {
	super(image.getTexture().getTextureWidth(), image.getTexture().getTextureHeight());
	this.image = image;
	
	Log.debug("Creating pbuffer(unique) "+image.getWidth()+"x"+image.getHeight());
	if ((Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) == 0) {
		throw new SlickException("Your OpenGL card does not support PBuffers and hence can't handle the dynamic images required for this application.");
	}

	init();
}
 

protected void initInThread(){
    if ((Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) == 0){
        logger.severe("Offscreen surfaces are not supported.");
        return;
    }

    pixelFormat = new PixelFormat(settings.getBitsPerPixel(),
                                  0,
                                  settings.getDepthBits(),
                                  settings.getStencilBits(),
                                  settings.getSamples());
    
    width = settings.getWidth();
    height = settings.getHeight();
    try{
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            public void uncaughtException(Thread thread, Throwable thrown) {
                listener.handleError("Uncaught exception thrown in "+thread.toString(), thrown);
            }
        });

        pbuffer = new Pbuffer(width, height, pixelFormat, null, null, createContextAttribs());
        pbuffer.makeCurrent();

        renderable.set(true);

        logger.info("Offscreen buffer created.");
        printContextInitInfo();
    } catch (LWJGLException ex){
        listener.handleError("Failed to create display", ex);
    } finally {
        // TODO: It is possible to avoid "Failed to find pixel format"
        // error here by creating a default display.
    }
    super.internalCreate();
    listener.initialize();
}
 

public final boolean usePbuffer() {
	return use_pbuffer && ((Pbuffer.getCapabilities() & Pbuffer.PBUFFER_SUPPORTED) != 0);
}