//
//  Util.h
//  interface
//
//  Created by Philip Rosedale on 8/24/12.
//  Copyright (c) 2012 High Fidelity, Inc. All rights reserved.
//

#ifndef __interface__Util__
#define __interface__Util__

#ifdef _WIN32
#include "Systime.h"
#else
#include <sys/time.h>
#endif

#include <glm/glm.hpp>
#include <glm/gtc/quaternion.hpp>
#include <QSettings>

// the standard sans serif font family
#define SANS_FONT_FAMILY "Helvetica"

// the standard mono font family
#define MONO_FONT_FAMILY "Courier"

void eulerToOrthonormals(glm::vec3 * angles, glm::vec3 * fwd, glm::vec3 * left, glm::vec3 * up);

float azimuth_to(glm::vec3 head_pos, glm::vec3 source_pos);
float angle_to(glm::vec3 head_pos, glm::vec3 source_pos, float render_yaw, float head_yaw);

float randFloat();
const glm::vec3 randVector();

void render_world_box();
int widthText(float scale, int mono, char const* string);
float widthChar(float scale, int mono, char ch);
void drawtext(int x, int y, float scale, float rotate, float thick, int mono, 
              char const* string, float r=1.0, float g=1.0, float b=1.0);
void drawvec3(int x, int y, float scale, float rotate, float thick, int mono, glm::vec3 vec, 
              float r=1.0, float g=1.0, float b=1.0);

void noiseTest(int w, int h);

void drawVector(glm::vec3* vector);

void printVector(glm::vec3 vec);

float angleBetween(const glm::vec3& v1, const glm::vec3& v2); 

glm::quat rotationBetween(const glm::vec3& v1, const glm::vec3& v2);

glm::vec3 safeEulerAngles(const glm::quat& q);

glm::quat safeMix(const glm::quat& q1, const glm::quat& q2, float alpha);

double diffclock(timeval *clock1,timeval *clock2);

void drawGroundPlaneGrid(float size);

void renderDiskShadow(glm::vec3 position, glm::vec3 upDirection, float radius, float darkness);

void renderOrientationDirections( glm::vec3 position, const glm::quat& orientation, float size );

void renderSphereOutline(glm::vec3 position, float radius, int numSides, glm::vec3 cameraPosition);
void renderCircle(glm::vec3 position, float radius, glm::vec3 surfaceNormal, int numSides );

void runTimingTests();


float loadSetting(QSettings* settings, const char* name, float defaultValue);

bool rayIntersectsSphere(glm::vec3& rayStarting, glm::vec3& rayNormalizedDirection, glm::vec3& sphereCenter, double sphereRadius);

#endif