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113 lines
2.8 KiB
113 lines
2.8 KiB
#include <iostream>
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#include <stdexcept>
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#include <chrono>
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#include <thread>
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#include <GL/glew.h>
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#include <GL/freeglut.h>
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#include "App.h"
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#include "globals.h"
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App* app_ptr = 0;
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unsigned int const frames_per_second = 200.0;
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typedef std::chrono::high_resolution_clock clock_type;
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size_t frame_count = 0;
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clock_type::time_point begin_time;
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void begin() {
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app_ptr = new App(kWindowWidth, kWindowHeight);
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begin_time = clock_type::now();
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}
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void end() {
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auto end = clock_type::now();
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auto difference = end-begin_time;
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auto time_elapsed = difference.count()*clock_type::duration::period::num/(double)clock_type::duration::period::den;
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std::cout << "Did " << frame_count << " frames in " << time_elapsed << " seconds." << std::endl;
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std::cout << "That's " << frame_count/time_elapsed << " frames per second." << std::endl;
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delete app_ptr;
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}
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int mouse_button_mapping(int button){
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switch(button){
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case GLUT_LEFT_BUTTON: return 0;
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case GLUT_MIDDLE_BUTTON: return 1;
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case GLUT_RIGHT_BUTTON: return 2;
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default: return 0;
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}
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}
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int main(int argc, char** argv) {
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// let glut create a window
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_ALPHA);
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glutInitWindowSize(kWindowWidth, kWindowHeight);
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glutCreateWindow("OpenGL");
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// we need glew for shaders
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auto err = glewInit();
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if(err != GLEW_OK) {
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throw std::runtime_error("A glew error");
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}
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// all callbacks (c++0x lambdas woei)
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glutDisplayFunc([] {
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auto const time_step = std::chrono::milliseconds(1000/frames_per_second);
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static auto previous_timepoint = clock_type::now();
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auto const current_timepoint = clock_type::now();
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auto const difference = current_timepoint - previous_timepoint;
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if(difference > time_step) {
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app_ptr->update();
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app_ptr->draw();
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glutSwapBuffers();
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//glFlush();
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++frame_count;
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previous_timepoint = current_timepoint-(difference%time_step);
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} else {
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usleep((time_step-difference).count()*1000000*clock_type::duration::period::num/(double)clock_type::duration::period::den/2);
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//std::sleep_for((time_step-difference)/2);
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}
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glutPostRedisplay();
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});
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glutReshapeFunc([](int w, int h) {app_ptr->resize(w, h);});
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glutMouseFunc([](int button, int state, int x, int y) {
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switch(state) {
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case GLUT_DOWN: app_ptr->mouse_buttons[mouse_button_mapping(button)] = true; break;
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case GLUT_UP: app_ptr->mouse_buttons[mouse_button_mapping(button)] = false; break;
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default: break;
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}
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});
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glutPassiveMotionFunc([](int x, int y) {
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app_ptr->mouse[0] = x;
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app_ptr->mouse[1] = y;
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});
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glutMotionFunc([](int x, int y) {
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app_ptr->mouse[0] = x;
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app_ptr->mouse[1] = y;
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});
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glutKeyboardFunc([](unsigned char x, int, int) {
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app_ptr->pressed(x);
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});
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glutCloseFunc(end); // freeglut extension
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// my app-object
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begin();
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// GO!
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glutMainLoop();
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return 0;
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}
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