Example usage for org.lwjgl.opengl GL11 nglReadPixels

Introduction

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

Prototype

public static void nglReadPixels(int x, int y, int width, int height, int format, int type, long pixels) 

Source Link

Document

Unsafe version of: #glReadPixels ReadPixels

Usage

From source file:com.samrj.devil.gl.DGL.java

License:Open Source License

/**
 * Creates a new image from the current read framebuffer and viewport.
 * Useful for taking screenshots./*from w  ww . j av a  2  s.  co m*/
 * 
 * @return A newly allocated image.
 */
public static Image screenshotImage() {
    int x, y, w, h;
    {
        long xAddr = MemStack.push(4);
        long yAddr = MemStack.push(4);
        long wAddr = MemStack.push(4);
        long hAddr = MemStack.push(4);
        GL11.nglGetIntegerv(GL11.GL_VIEWPORT, xAddr);
        x = MemoryUtil.memGetInt(xAddr);
        y = MemoryUtil.memGetInt(yAddr);
        w = MemoryUtil.memGetInt(wAddr);
        h = MemoryUtil.memGetInt(hAddr);
        MemStack.pop(4);
    }

    Image out = genImage(w, h, 3, PrimType.BYTE);
    GL11.nglReadPixels(x, y, w, h, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, out.address());
    return out;
}

---