Snake-Game-OpenGL/main.cpp at main · sigma-asif/Snake-Game-OpenGL · GitHub

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#include <GL/gl.h>
#include <GL/glut.h>
#include <stdlib.h>
#include <windows.h>
#include "game.h"
#include "menu.h"

#define COLUMNS 40
#define ROWS 40

extern short sDirection;
bool gameOver = false;
bool gameStarted = false;
int FPS = DIFFICULTY_MEDIUM;
int score = 0;

void timer_callback(int);
void display_callback();
void reshape_callback(int, int);
void keyboard_callback(int, int, int);

void init() {
    glClearColor(0.0, 0.0, 0.0, 1.0);
    initGrid(COLUMNS, ROWS);
    initMenu();
}

// No resetGame() function definition here, just using the one from game.cpp

int main(int argc, char **argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    glutInitWindowSize(500, 500);
    glutCreateWindow("SNAKE GAME");
    glutDisplayFunc(display_callback);
    glutReshapeFunc(reshape_callback);
    glutTimerFunc(0, timer_callback, 0);
    glutSpecialFunc(keyboard_callback);
    glutMouseFunc(mouseCallback);
    init();
    glutMainLoop();
    return 0;
}

void display_callback() {
    glClear(GL_COLOR_BUFFER_BIT);

    if (!gameStarted) {
        // Display menu
        drawMenu();
    } else {
        // Game is running
        drawGrid();
        drawSnake();
        drawFood();

        if (gameOver) {
            char _score[10];
            itoa(score, _score, 10);
            char text[50] = "Your Score: ";
            strcat(text, _score);
            MessageBox(NULL, text, "GAME OVER", 0);
            resetGame();
        }
    }

    glutSwapBuffers();
}

void reshape_callback(int w, int h) {
    glViewport(0, 0, (GLsizei)w, (GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, COLUMNS, 0.0, ROWS, -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);
}

void timer_callback(int) {
    glutPostRedisplay();
    glutTimerFunc(1000/FPS, timer_callback, 0);
}

void keyboard_callback(int key, int, int) {
    if (gameStarted) {
        switch(key) {
            case GLUT_KEY_UP:
                if (sDirection != DOWN)
                    sDirection = UP;
                break;

            case GLUT_KEY_DOWN:
                if (sDirection != UP)
                    sDirection = DOWN;
                break;

            case GLUT_KEY_RIGHT:
                if (sDirection != LEFT)
                    sDirection = RIGHT;
                break;

            case GLUT_KEY_LEFT:
                if (sDirection != RIGHT)
                    sDirection = LEFT;
                break;

            case GLUT_KEY_F1:
                // Escape key to return to menu
                resetGame();
                break;
        }
    }
}