int main(void) { GLFWwindow window; int width, height; if (!glfwInit()) { fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError())); exit(EXIT_FAILURE); } window = glfwCreateWindow(window_width, window_height, GLFW_WINDOWED, "", NULL); if (!window) { glfwTerminate(); fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError())); exit(EXIT_FAILURE); } glfwSetCursorPosCallback(window, cursor_position_callback); glfwSetWindowSizeCallback(window, window_size_callback); glfwSetKeyCallback(window, key_callback); glfwMakeContextCurrent(window); glfwGetWindowSize(window, &width, &height); window_size_callback(window, width, height); set_swap_interval(window, swap_interval); while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED)) { glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_LINES); glVertex2f(0.f, (GLfloat) window_height - cursor_y); glVertex2f((GLfloat) window_width, (GLfloat) window_height - cursor_y); glVertex2f((GLfloat) cursor_x, 0.f); glVertex2f((GLfloat) cursor_x, (GLfloat) window_height); glEnd(); glfwSwapBuffers(window); glfwPollEvents(); } glfwTerminate(); exit(EXIT_SUCCESS); }
int main(int argc, char* argv[]) { GLFWwindow* window; double t, dt_total, t_old; int width, height; glfwSetErrorCallback(error_callback); if (!glfwInit()) exit(EXIT_FAILURE); window = glfwCreateWindow(640, 480, "Wave Simulation", NULL, NULL); if (!window) { glfwTerminate(); exit(EXIT_FAILURE); } glfwSetKeyCallback(window, key_callback); glfwSetWindowSizeCallback(window, window_size_callback); glfwSetMouseButtonCallback(window, mouse_button_callback); glfwSetCursorPosCallback(window, cursor_position_callback); glfwSetScrollCallback(window, scroll_callback); glfwMakeContextCurrent(window); glfwSwapInterval(1); glfwGetWindowSize(window, &width, &height); window_size_callback(window, width, height); // Initialize OpenGL init_opengl(); // Initialize simulation init_vertices(); init_grid(); adjust_grid(); // Initialize timer t_old = glfwGetTime() - 0.01; while (!glfwWindowShouldClose(window)) { t = glfwGetTime(); dt_total = t - t_old; t_old = t; // Safety - iterate if dt_total is too large while (dt_total > 0.f) { // Select iteration time step dt = dt_total > MAX_DELTA_T ? MAX_DELTA_T : dt_total; dt_total -= dt; // Calculate wave propagation calc_grid(); } // Compute height of each vertex adjust_grid(); // Draw wave grid to OpenGL display draw_scene(window); glfwPollEvents(); } exit(EXIT_SUCCESS); }