Example usage for org.lwjgl.opengl GL11 glReadPixels

Introduction

In this page you can find the example usage for org.lwjgl.opengl GL11 glReadPixels.

Prototype

public static void glReadPixels(@NativeType("GLint") int x, @NativeType("GLint") int y,
        @NativeType("GLsizei") int width, @NativeType("GLsizei") int height, @NativeType("GLenum") int format,
        @NativeType("GLenum") int type, @NativeType("void *") float[] pixels) 

Source Link

Document

Array version of: #glReadPixels ReadPixels

Usage

From source file:a1.utils.Utils.java

License:Open Source License

public static void MakeScreenshot() {
    // Set screen size
    int width = Config.getScreenWidth();
    int height = Config.getScreenHeight();
    // allocate space for RBG pixels
    ByteBuffer framebytes = allocBytes(width * height * 3);
    int[] pixels = new int[width * height];
    int bindex;/*from  w  w w.j a  v a2  s . c  o  m*/
    // grab a copy of the current frame contents as RGB (has to be UNSIGNED_BYTE or colors come out too dark)
    GL11.glReadPixels(0, 0, width, height, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, framebytes);
    // copy RGB data from ByteBuffer to integer array
    for (int i = 0; i < pixels.length; i++) {
        bindex = i * 3;
        pixels[i] = 0xFF000000 // A
                | ((framebytes.get(bindex) & 0x000000FF) << 16) // R
                | ((framebytes.get(bindex + 1) & 0x000000FF) << 8) // G
                | ((framebytes.get(bindex + 2) & 0x000000FF) << 0); // B
    }
    // free up this memory
    framebytes = null;
    // flip the pixels vertically (opengl has 0,0 at lower left, java is upper left)
    pixels = flipPixels(pixels, width, height);
    try {
        // Create a BufferedImage with the RGB pixels then save as PNG
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        image.setRGB(0, 0, width, height, pixels, 0, width);

        // Generate filename
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
        String filename = sdf.format(cal.getTime());
        // Check directory
        File dir = new File("screenshots");
        if (!dir.exists())
            dir.mkdir();

        javax.imageio.ImageIO.write(image, "png", new File("screenshots\\" + filename + ".png"));
    } catch (Exception e) {
        Log.info("GLApp.screenShot(): exception " + e);
    }
}

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From source file:arg.RenderRecipe.java

License:Open Source License

public void draw() {

    File dir = new File(Minecraft.getMinecraft().mcDataDir, "recipes");
    if (!dir.exists() && !dir.mkdirs()) {
        throw new RuntimeException("The recipes directory could not be created: " + dir);
    }/*from  ww  w . j  a v a  2  s.com*/

    name = name.replace(" ", "");
    File file = new File(Minecraft.getMinecraft().mcDataDir, "recipes/" + name + ".png");

    if (file.exists())
        return;

    GL11.glPushMatrix();
    GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS);
    GL11.glPushClientAttrib(GL11.GL_ALL_CLIENT_ATTRIB_BITS);
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glViewport(0, 0, width, height);
    GL11.glOrtho(0.0D, xSize, ySize, 0.0D, 1000.0D, 3000.0D);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glLoadIdentity();
    GL11.glTranslatef(0.0F, 0.0F, -2000.0F);
    GL11.glLineWidth(1.0F);

    GL11.glEnable(GL11.GL_COLOR_MATERIAL);

    try {
        drawScreen(0, 0, 0);
    } catch (Exception e) {
        e.printStackTrace();
    }

    int[] pixels = new int[width * height];
    int bindex;

    ByteBuffer fb = ByteBuffer.allocateDirect(width * height * 3);

    GL11.glReadPixels(0, 0, width, height, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, fb);
    GL11.glPopMatrix();
    GL11.glPopAttrib();
    GL11.glPopClientAttrib();
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
    try {
        Display.swapBuffers();
    } catch (LWJGLException e1) {
        e1.printStackTrace();
    }

    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)) * 3;
            int r = fb.get(i) & 0xFF;
            int g = fb.get(i + 1) & 0xFF;
            int b = fb.get(i + 2) & 0xFF;
            image.setRGB(x, height - (y + 1), (0xFF << 24) | (r << 16) | (g << 8) | b);
        }
    }

    try {
        ImageIO.write(image, "png", file);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:buildcraft.BuildCraftCore.java

License:Minecraft Mod Public

@SubscribeEvent
@SideOnly(Side.CLIENT)//w ww  .  j a v  a2  s.  co  m
public void renderLast(RenderWorldLastEvent evt) {
    // TODO: while the urbanist is deactivated, this code can be dormant.
    // it happens to be very expensive at run time, so we need some way
    // to operate it only when releval (e.g. in the cycle following a
    // click request).
    if (NEXTGEN_PREALPHA) {
        return;
    }

    /**
     * Note (SpaceToad): Why on earth this thing eventually worked out is a
     * mystery to me. In particular, all the examples I got computed y in
     * a different way. Anyone with further OpenGL understanding would be
     * welcome to explain.
     *
     * Anyway, the purpose of this code is to store the block position
     * pointed by the mouse at each frame, relative to the entity that has
     * the camera.
     *
     * It got heavily inspire from the two following sources:
     * http://nehe.gamedev.net/article/using_gluunproject/16013/
     * #ActiveRenderInfo.updateRenderInfo.
     *
     * See EntityUrbanist#rayTraceMouse for a usage example.
     */

    if (modelviewF == null) {
        modelviewF = GLAllocation.createDirectFloatBuffer(16);
        projectionF = GLAllocation.createDirectFloatBuffer(16);
        viewport = GLAllocation.createDirectIntBuffer(16);

    }

    GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, modelviewF);
    GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, projectionF);
    GL11.glGetInteger(GL11.GL_VIEWPORT, viewport);
    float f = (viewport.get(0) + viewport.get(2)) / 2;
    float f1 = (viewport.get(1) + viewport.get(3)) / 2;

    float x = Mouse.getX();
    float y = Mouse.getY();

    // TODO: Minecraft seems to instist to have this winZ re-created at
    // each frame - looks like a memory leak to me but I couldn't use a
    // static variable instead, as for the rest.
    FloatBuffer winZ = GLAllocation.createDirectFloatBuffer(1);
    GL11.glReadPixels((int) x, (int) y, 1, 1, GL11.GL_DEPTH_COMPONENT, GL11.GL_FLOAT, winZ);

    GLU.gluUnProject(x, y, winZ.get(), modelviewF, projectionF, viewport, pos);

    diffX = pos.get(0);
    diffY = pos.get(1);
    diffZ = pos.get(2);
}

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From source file:cellSim2.SimLWJGL.java

License:Open Source License

public static int main(String[] args, int width, int height, String title, Simulation demoApp)
        throws LWJGLException {
    Display.setDisplayMode(new DisplayMode(width, height));
    Display.setTitle(title);/*from w w  w.j a va 2s .com*/
    Display.create(new PixelFormat(0, 24, 0));

    Keyboard.create();
    Keyboard.enableRepeatEvents(true);
    Mouse.create();

    gl.init();

    demoApp.myinit();
    demoApp.reshape(width, height);

    boolean quit = false;

    long lastTime = System.currentTimeMillis();
    int frames = 0;

    while (!Display.isCloseRequested() && !quit && !demoApp.readyToQuit()) {
        demoApp.moveAndDisplay();
        Display.update();

        if (demoApp.timeToOutputImage()) {
            GL11.glReadBuffer(GL11.GL_FRONT);
            int w = Display.getDisplayMode().getWidth();
            int h = Display.getDisplayMode().getHeight();
            ByteBuffer buf = demoApp.getImageBuffer(w, h);
            GL11.glReadPixels(0, 0, width, height, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buf);
            demoApp.outputImage();
        }

        int modifiers = 0;
        if (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT) || Keyboard.isKeyDown(Keyboard.KEY_RSHIFT))
            modifiers |= KeyEvent.SHIFT_DOWN_MASK;
        if (Keyboard.isKeyDown(Keyboard.KEY_LCONTROL) || Keyboard.isKeyDown(Keyboard.KEY_RCONTROL))
            modifiers |= KeyEvent.CTRL_DOWN_MASK;
        if (Keyboard.isKeyDown(Keyboard.KEY_LMETA) || Keyboard.isKeyDown(Keyboard.KEY_RMETA))
            modifiers |= KeyEvent.ALT_DOWN_MASK;

        while (Keyboard.next()) {
            if (Keyboard.getEventCharacter() != '\0') {
                demoApp.keyboardCallback(Keyboard.getEventCharacter(), Mouse.getX(), Mouse.getY(), modifiers);
            }

            if (Keyboard.getEventKeyState()) {
                demoApp.specialKeyboard(Keyboard.getEventKey(), Mouse.getX(), Mouse.getY(), modifiers);
            } else {
                demoApp.specialKeyboardUp(Keyboard.getEventKey(), Mouse.getX(), Mouse.getY(), modifiers);
            }

            if (Keyboard.getEventKey() == Keyboard.KEY_ESCAPE)
                quit = true;
            if (Keyboard.getEventKey() == Keyboard.KEY_Q)
                quit = true;
        }

        while (Mouse.next()) {
            if (Mouse.getEventButton() != -1) {
                int btn = Mouse.getEventButton();
                if (btn == 1) {
                    btn = 2;
                } else if (btn == 2) {
                    btn = 1;
                }
                demoApp.mouseFunc(btn, Mouse.getEventButtonState() ? 0 : 1, Mouse.getEventX(),
                        Display.getDisplayMode().getHeight() - 1 - Mouse.getEventY());
            }
            demoApp.mouseMotionFunc(Mouse.getEventX(),
                    Display.getDisplayMode().getHeight() - 1 - Mouse.getEventY());
        }

        long time = System.currentTimeMillis();
        if (time - lastTime < 1000) {
            frames++;
        } else {
            Display.setTitle(title + " | FPS: " + frames);
            lastTime = time;
            frames = 0;
        }
    }

    //This line is the whole point of making this class
    demoApp.wrapUp();
    Display.destroy();
    demoApp.destroy();
    return 0;
}

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From source file:com.a2client.util.Utils.java

License:Open Source License

public static void MakeScreenshot() {
    // Set screen size
    int width = Config.getScreenWidth();
    int height = Config.getScreenHeight();
    // allocate space for RBG pixels
    ByteBuffer framebytes = allocBytes(width * height * 3);
    int[] pixels = new int[width * height];
    int bindex;//from   w  w  w  . j a v  a 2s . com
    // grab a copy of the current frame contents as RGB (has to be UNSIGNED_BYTE or colors come out too dark)
    GL11.glReadPixels(0, 0, width, height, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, framebytes);
    // copy RGB data from ByteBuffer to integer array
    for (int i = 0; i < pixels.length; i++) {
        bindex = i * 3;
        pixels[i] = 0xFF000000 // A
                | ((framebytes.get(bindex) & 0x000000FF) << 16) // R
                | ((framebytes.get(bindex + 1) & 0x000000FF) << 8) // G
                | ((framebytes.get(bindex + 2) & 0x000000FF) << 0); // B
    }
    // free up this memory
    framebytes = null;
    // flip the pixels vertically (opengl has 0,0 at lower left, java is upper left)
    pixels = flipPixels(pixels, width, height);
    try {
        // Create a BufferedImage with the RGB pixels then save as PNG
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        image.setRGB(0, 0, width, height, pixels, 0, width);

        // Generate filename
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
        String filename = sdf.format(cal.getTime());
        // Check directory
        File dir = new File("screenshots");
        if (!dir.exists())
            dir.mkdir();

        javax.imageio.ImageIO.write(image, "png", new File("screenshots" + File.separator + filename + ".png"));
    } catch (Exception e) {
        Log.info("GLApp.screenShot(): exception " + e);
    }
}

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From source file:com.ardor3d.framework.lwjgl.LwjglHeadlessCanvas.java

License:Open Source License

public void draw() {
    // bind correct fbo
    EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT,
            _useMSAA ? _msfboID : _fboID);

    // Make sure this OpenGL context is current.
    ContextManager.switchContext(this);
    try {//from w w  w  .  ja  v a 2s.co  m
        _buff.makeCurrent();
    } catch (final LWJGLException ex) {
        ex.printStackTrace();
    }

    // make sure camera is set
    if (Camera.getCurrentCamera() != _camera) {
        _camera.update();
    }
    _camera.apply(_renderer);

    // clear buffers
    GL11.glDisable(GL11.GL_SCISSOR_TEST);
    _renderer.clearBuffers(Renderer.BUFFER_COLOR | Renderer.BUFFER_DEPTH);

    // draw our scene
    _scene.renderUnto(_renderer);
    _renderer.flushFrame(false);

    // if we're multisampled, we need to blit to a non-multisampled fbo first
    if (_useMSAA) {
        EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferBlit.GL_DRAW_FRAMEBUFFER_EXT, _fboID);
        EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferBlit.GL_READ_FRAMEBUFFER_EXT, _msfboID);
        EXTFramebufferBlit.glBlitFramebufferEXT(0, 0, _settings.getWidth(), _settings.getHeight(), 0, 0,
                _settings.getWidth(), _settings.getHeight(),
                GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT | GL11.GL_STENCIL_BUFFER_BIT,
                GL11.GL_NEAREST);

        // get ready to read non-msaa fbo
        EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, _fboID);
    }

    // read data from our color buffer
    _data.rewind();
    GL11.glReadBuffer(EXTFramebufferObject.GL_COLOR_ATTACHMENT0_EXT);
    GL11.glReadPixels(0, 0, _settings.getWidth(), _settings.getHeight(), GL12.GL_BGRA, GL11.GL_UNSIGNED_BYTE,
            _data);

    // release our FBO.
    EXTFramebufferObject.glBindFramebufferEXT(EXTFramebufferObject.GL_FRAMEBUFFER_EXT, 0);
}

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From source file:com.ardor3d.renderer.lwjgl.LwjglRenderer.java

License:Open Source License

public void grabScreenContents(final ByteBuffer buff, final ImageDataFormat format, final PixelDataType type,
        final int x, final int y, final int w, final int h) {
    final int pixFormat = LwjglTextureUtil.getGLPixelFormat(format);
    final int pixDataType = LwjglTextureUtil.getGLPixelDataType(type);
    GL11.glReadPixels(x, y, w, h, pixFormat, pixDataType, buff);
}

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From source file:com.badlogic.gdx.backends.jglfw.JglfwGL20.java

License:Apache License

public void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    if (pixels instanceof ByteBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (ByteBuffer) pixels);
    else if (pixels instanceof ShortBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (ShortBuffer) pixels);
    else if (pixels instanceof IntBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (IntBuffer) pixels);
    else if (pixels instanceof FloatBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (FloatBuffer) pixels);
    else// www .j a va2s . c o  m
        throw new GdxRuntimeException("Can't use " + pixels.getClass().getName()
                + " with this method. Use ByteBuffer, ShortBuffer, IntBuffer or FloatBuffer instead. Blame LWJGL");
}

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From source file:com.badlogic.gdx.backends.lwjgl.LwjglGL10.java

License:Apache License

public final void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    if (pixels instanceof ByteBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (ByteBuffer) pixels);
    else if (pixels instanceof ShortBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (ShortBuffer) pixels);
    else if (pixels instanceof IntBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (IntBuffer) pixels);
    else if (pixels instanceof FloatBuffer)
        GL11.glReadPixels(x, y, width, height, format, type, (FloatBuffer) pixels);
    else/*from www .ja v a 2 s  . c  o  m*/
        throw new GdxRuntimeException("Can't use " + pixels.getClass().getName()
                + " with this method. Use ByteBuffer, ShortBuffer, IntBuffer or FloatBuffer instead. Blame LWJGL");
}

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From source file:com.company.Rendering.RenderingUtils.java

public static void TakeScreenShot() {
    GL11.glReadBuffer(GL11.GL_FRONT);//www. ja  va2  s  . co m
    ByteBuffer videoMode = glfwGetVideoMode(glfwGetPrimaryMonitor());
    int width = (GLFWvidmode.width(videoMode));
    int height = (GLFWvidmode.height(videoMode));
    int bpp = 4;
    ByteBuffer buffer = BufferUtils.createByteBuffer(width * height * bpp);
    GL11.glReadPixels(0, 0, width, height, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer);
    try {
        ImageIO.write(RenderingUtils.BufferToImage(width, height, bpp, buffer), "bmp",
                new File("Screen_Shot_" + System.currentTimeMillis() + ".bmp"));
    } catch (IOException ex) {
        Logger.getLogger(TestGame.class.getName()).log(Level.SEVERE, null, ex);
    }
}

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