#ifndef VIEW_H
#define VIEW_H

#include <set>
#include <map>

using namespace std;

#include "util.h"

struct view {
  sector orig;
  point p;
  vec3 d, u;
  float fov;
  int w, h;

  void draw (draw_context &ctx);
};

struct visibility_state {
  unsigned int generation;
  enum { UNKNOWN, OCCLUDED, PARTIAL, FULL } visibility;

  visibility_state () : generation(0), visibility(UNKNOWN) { };
};

struct draw_context {
  view &v;

  gl_matrix projection;
  struct {
    plane l, r, t, b, n, f;
  } frustum;
  enum { DEPTH, LIGHTED } mode;
  light *l;
  set<entity_base *> drawn;

  unsigned int generation;
  map<octant *, visibility_state> vismap;
  vector<octant *> vislist; // octants partially or fully visible
  vector<octant *> checklist; // octants possibly visible

  bool may_draw (entity_base *e);

  draw_context (view &v);
  ~draw_context ();
};

inline void update_matrix (const draw_context &ctx)
{
  gl_matrix m1 = ctx.projection;
  gl_matrix m2;

  glGetFloatv (GL_MODELVIEW_MATRIX, (GLfloat *)&m2);

  m1 = m1 * m2;

  for (int i = 0; i < 4; i++)
    for (int j = 0; j < 4 ; j++)
      mvp[i][j] = m1(i,j);
}

#endif