/*
  This collection of software is designed to help in learning and teaching
  about using OpenGL to build 3D graphics programs.
  Copyright (C) 2006 Scott D. Anderson
  scott.anderson@acm.org
*/

#include <ctype.h>              // for isgraph()
#include <stdio.h>
#include <stdlib.h>
#include <string.h>             // for strcmp()
#include <stdarg.h>             // for va_list()
#include <sys/types.h>          // for stat
#include <sys/stat.h>           // for stat
#include <unistd.h>
#include <float.h>              // for FLT_MAX
#include <math.h>

#include <errno.h>

#include <tw.h>

void twErrorCheck(char* file, int line) {
    int err=glGetError();
    if(err!=GL_NO_ERROR) {
        char* msg;
        switch(err) {
        case GL_INVALID_ENUM: msg="Invalid Enum"; break;
        case GL_INVALID_VALUE: msg="Invalid Value"; break;
        case GL_INVALID_OPERATION: msg="Invalid Operation"; break;
        case GL_STACK_OVERFLOW: msg="Stack Overflow"; break;
        case GL_STACK_UNDERFLOW: msg="Stack Underflow"; break;
        case GL_OUT_OF_MEMORY: msg="Out of Memory"; break;
        case GL_TABLE_TOO_LARGE: msg="Table too large"; break;
        }
        printf("Error %s discovered in check at line %d in %s\n",msg,line,file);
    }
}

#include "tw-util.cc"
#include "tw-messages.cc"
#include "tw-wrappers.cc"
#include "tw-menu.cc"
#include "tw-color.cc"
#include "tw-bounding-box.cc"
#include "tw-lighting.cc"
#include "tw-window.cc"
#include "tw-camera.cc"
#include "tw-geometry.cc"
#include "tw-keyboard.cc"
#include "tw-textures.cc"
#include "tw-fonts.cc"
#include "tw-objects.cc"
#include "tw-mouse.cc"
#include "tw-animation.cc"

void twDisplayInit(GLclampf bgR, GLclampf bgG, GLclampf bgB) {
    glClearColor(bgR,bgG,bgB,1);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glDisable(GL_LIGHTING);
    if( Toggles[LIGHTING] )
        glEnable(GL_LIGHTING);
    else
        glDisable(GL_LIGHTING);
    if( Toggles[SMOOTH] )
        glShadeModel(GL_SMOOTH);
    else
        glShadeModel(GL_FLAT);
    if( Toggles[FILTER_NEAREST] ) {
        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    } else {
        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    }
}

void twDisplayInit() {
    twDisplayInit(0.75,0.75,0.75);
}

void twMainInit() {
  glEnable(GL_AUTO_NORMAL);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_NORMALIZE);
  glDepthFunc(GL_LEQUAL); 
  twKeyInit();
  glutKeyboardFunc(twKeyboardCallback);
  glutMouseFunc(twMouseFunction);
  glutMotionFunc(twMotionFunction);
  glutReshapeFunc(twReshapeFunction);
  twIdleFunc(NULL);
  FieldOfView = FieldOfViewY;
  // All our toggles default to false
  for(int i=0; i<NUM_TOGGLES; i++) 
      Toggles[i] = false;
  makeToggleMenu();
  // irrelevant if lighting is off
  glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
  twAmbient(GlobalAmbient);
  twZview();
}