Class FrameBuffer

core/src/processing/opengl/FrameBuffer.java:44–503

Encapsulates a Frame Buffer Object for offscreen rendering. When created with onscreen == true, it represents the normal framebuffer. Needed by the stack mechanism in OPENGL2 to return to onscreen rendering after a sequence of pushFramebuffer calls. It transparently handles the situations when the F

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public class FrameBuffer implements PConstants {
  protected PGraphicsOpenGL pg;
  protected PGL pgl;
  protected int context;   // The context that created this framebuffer.

  public int glFbo;
  public int glDepth;
  public int glStencil;
  public int glDepthStencil;
  public int glMultisample;
  public int width;
  public int height;
  private GLResourceFrameBuffer glres;

  protected int depthBits;
  protected int stencilBits;
  protected boolean packedDepthStencil;

  protected boolean multisample;
  protected int nsamples;

  protected int numColorBuffers;
  protected Texture[] colorBufferTex;

  protected boolean screenFb;
  protected boolean noDepth;

  protected IntBuffer pixelBuffer;


  FrameBuffer(PGraphicsOpenGL pg) {
    this.pg = pg;
    pgl = pg.pgl;
    context = pgl.createEmptyContext();
  }


  FrameBuffer(PGraphicsOpenGL pg, int w, int h, int samples, int colorBuffers,
              int depthBits, int stencilBits, boolean packedDepthStencil,
              boolean screen) {
    this(pg);

    glFbo = 0;
    glDepth = 0;
    glStencil = 0;
    glDepthStencil = 0;
    glMultisample = 0;

    if (screen) {
      // If this framebuffer is used to represent a on-screen buffer,
      // then it doesn't make it sense for it to have multisampling,
      // color, depth or stencil buffers.
      depthBits = stencilBits = samples = colorBuffers = 0;
    }

    width = w;
    height = h;