Java Code Examples for org.lwjgl.opengl.GL11#glReadBuffer()

/**
 * Make a screenshot from the current LWJGL Display
 * Code from pc
 */
public void makeScreenshot() {
    curTime = System.currentTimeMillis();
   
    ByteBuffer screenBuffer = ByteBuffer.allocateDirect(Display.getDisplayMode().getWidth() * Display.getDisplayMode().getHeight() * 3);
    
    try {
            GL11.glReadBuffer(GL11.GL_BACK);
            GL11.glPixelStorei(GL11.GL_PACK_ALIGNMENT, 1);
            GL11.glReadPixels(0, 0, Display.getDisplayMode().getWidth(),
                            Display.getDisplayMode().getHeight(), GL11.GL_RGB,
                            GL11.GL_UNSIGNED_BYTE, screenBuffer);
            
            long delay = (lastTime == -1) ? 0: curTime-lastTime;
            lastTime = curTime;
            thread.addFrame(screenBuffer, delay);
            
    } catch (Exception e) {
            System.out.println("Streaming exception.");
            e.printStackTrace();
    }
}
 

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;
	}
}
 

/**
 * Copy the contents of a colour attachment of this FBO to the screen.
 * 
 * @param colourIndex
 *            - The index of the colour buffer that should be blitted.
 */
public void blitToScreen(int colourIndex) {
	GL30.glBindFramebuffer(GL30.GL_DRAW_FRAMEBUFFER, 0);
	GL11.glDrawBuffer(GL11.GL_BACK);
	GL30.glBindFramebuffer(GL30.GL_READ_FRAMEBUFFER, fboId);
	GL11.glReadBuffer(GL30.GL_COLOR_ATTACHMENT0 + colourIndex);
	GL30.glBlitFramebuffer(0, 0, width, height, 0, 0, Display.getWidth(), Display.getHeight(),
			GL11.GL_COLOR_BUFFER_BIT, GL11.GL_NEAREST);
	GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, 0);
}
 

/**
 * Copy the contents of this FBO to another FBO. This can be used to resolve
 * multisampled FBOs.
 * 
 * @param srcColourIndex
 *            - Index of the colour buffer in this (the source) FBO.
 * @param target
 *            - The target FBO.
 * @param targetColourIndex
 *            - The index of the target colour buffer in the target FBO.
 */
public void blitToFbo(int srcColourIndex, Fbo target, int targetColourIndex) {
	GL30.glBindFramebuffer(GL30.GL_DRAW_FRAMEBUFFER, target.fboId);
	GL11.glDrawBuffer(GL30.GL_COLOR_ATTACHMENT0 + targetColourIndex);

	GL30.glBindFramebuffer(GL30.GL_READ_FRAMEBUFFER, fboId);
	GL11.glReadBuffer(GL30.GL_COLOR_ATTACHMENT0 + srcColourIndex);

	int bufferBit = depthAttachment != null && target.depthAttachment != null
			? GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT : GL11.GL_COLOR_BUFFER_BIT;
	GL30.glBlitFramebuffer(0, 0, width, height, 0, 0, target.width, target.height, bufferBit, GL11.GL_NEAREST);
	GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, 0);
}
 

/**
 * @author http://wiki.lwjgl.org/index.php?title=Taking_Screen_Shots
 */
public void takeScreenShot() {
	// TODO: get a decent place for this
	// create the screenshot directory
	if (!screenshotDir.isDirectory() && !screenshotDir.mkdir()) {
		bubNotifs.sendf(
			BUB_RED,
			"Failed to create screenshot directory at '%s'.",
			screenshotDir.getAbsolutePath()
		);
		return;
	}

	// create file name
	SimpleDateFormat date = new SimpleDateFormat("yyyyMMdd_HHmmss");
	final String fileName = String.format("screenshot_%s.%s", date.format(new Date()), OPTION_SCREENSHOT_FORMAT.getValueString().toLowerCase());
	final File file = new File(screenshotDir, fileName);

	SoundController.playSound(SoundEffect.SHUTTER);

	// copy the screen to file
	final int width = Display.getWidth();
	final int height = Display.getHeight();
	final int bpp = 3;  // assuming a 32-bit display with a byte each for red, green, blue, and alpha
	final ByteBuffer buffer = BufferUtils.createByteBuffer(width * height * bpp);
	GL11.glReadBuffer(GL11.GL_FRONT);
	GL11.glPixelStorei(GL11.GL_PACK_ALIGNMENT, 1);
	GL11.glReadPixels(0, 0, width, height, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, buffer);
	new Thread() {
		@Override
		public void run() {
			try {
				BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
				for (int x = 0; x < width; x++) {
					for (int y = 0; y < height; y++) {
						int i = (x + (width * y)) * bpp;
						int r = buffer.get(i) & 0xFF;
						int g = buffer.get(i + 1) & 0xFF;
						int b = buffer.get(i + 2) & 0xFF;
						image.setRGB(x, height - (y + 1), (0xFF << 24) | (r << 16) | (g << 8) | b);
					}
				}
				ImageIO.write(image, OPTION_SCREENSHOT_FORMAT.getValueString().toLowerCase(), file);
				bubNotifs.send(BUB_PURPLE, "Created " + fileName);
			} catch (Exception e) {
				Log.error("Could not take screenshot", e);
				bubNotifs.send(
					BUB_PURPLE,
					"Failed to take a screenshot. See log file for details"
				);
			}
		}
	}.start();
}
 

/**
 * Bind to the FBO created
 */
private void bind() {
	EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, FBO);
	GL11.glReadBuffer(EXTFramebufferObject.GL_COLOR_ATTACHMENT0_EXT);
}
 

/**
 * Unbind from the FBO created
 */
private void unbind() {
	EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, 0);
	GL11.glReadBuffer(GL11.GL_BACK); 
}