ProjectionFix.pde

/*
COMP 3490 Fall 2022
 Assignment 3
 Tara Boulanger
 7922331
 
 ProjectionFix
    This is the file containing the functions to compell Processing to let us edit the projection matrix.
*/

PGraphicsOpenGL pogl = null;

// called at the beginning of your code
void setupPOGL() {
  pogl = (PGraphicsOpenGL)g;
}

// for debugging
void printProjection() {
  pogl.projection.print();
}

// call immediately after using perspective() to create a view frustum
void fixFrustumYAxis() {
  PMatrix3D projection = getProjection();
  projection.preApply(new PMatrix3D(
    1, 0, 0, 0,
    0, -1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1
    ));
  setProjection(projection);
}

PMatrix3D getProjection() {
  assert pogl != null: "no PGraphics OpenGL context";
  return pogl.projection.get();
}

void setProjection(PMatrix3D projectionMatrix) {
  assert pogl != null: "no PGraphics OpenGL context";
  pogl.projection.set(projectionMatrix.get());
  pogl.updateProjmodelview();
}