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snake.c
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snake.c
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#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <time.h>
#include <stdint.h>
typedef struct __point_t {
int x;
int y;
} point_t;
typedef enum __direction_t { DIRECTION_UP, DIRECTION_DOWN, DIRECTION_LEFT, DIRECTION_RIGHT } direction_t;
struct snake_t {
point_t *reszek;
int hossz; // reszek[] hossza
direction_t irany;
double sleep;
} snake;
point_t kaja;
const point_t grid_size = { 60, 35 };
const int quad_size = 15;
const int reszek_kezdo = 6;
const int falon_atmegy = 1;
int snake_speed = 3;
int pontok = 0;
int ment = 1;
int vege = 0;
int rekord = 0;
int ujrekord = 0;
int frames = 0;
int fps = 0;
void draw_quad(point_t at);
void gameover(void);
void quit(int val);
void update_pontok(void);
void kaja_gen(void);
void kaja_draw(void);
void kaja_init(void);
void snake_setspeed(void);
void snake_init(void);
void snake_novel(point_t pos);
void snake_draw(void);
void snake_update(int val);
void calcFPS(int ignored);
void glut_draw(void);
void glut_keyboard(unsigned char key, int x, int y);
void glut_special(int key, int x, int y);
void glut_reshape(int width, int height);
void glut_render_fonts(char *text, int x, int y);
void update(int value);
int main(int argc, char *argv[]) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
glutInitWindowSize(grid_size.x * quad_size, (grid_size.y + 1) * quad_size);
glutCreateWindow("Snake game");
glutDisplayFunc(glut_draw);
glutKeyboardFunc(glut_keyboard);
glutSpecialFunc(glut_special);
glutReshapeFunc(glut_reshape);
glutTimerFunc(1000, calcFPS, 0);
glutTimerFunc(snake.sleep * 1000, snake_update, 0);
snake_init();
kaja_init();
glutMainLoop();
return EXIT_SUCCESS;
}
void draw_quad(point_t pos) {
float start_x = -1.0f + pos.x * (2.0f / grid_size.x) + (2.0f / (grid_size.x * quad_size));
float start_y = 1.0f - pos.y * (2.0f / grid_size.y) - (2.0f / (grid_size.y * quad_size));
float end_x = start_x + (2.0f / grid_size.x) - (2.0f / (grid_size.x * quad_size));
float end_y = start_y - (2.0f / grid_size.y) + (2.0f / (grid_size.y * quad_size));
glBegin(GL_QUADS);
glVertex3f(start_x, start_y, 0.0f);
glVertex3f(start_x, end_y, 0.0f);
glVertex3f( end_x, end_y, 0.0f);
glVertex3f( end_x, start_y, 0.0f);
glEnd();
}
void gameover(void) {
FILE *rekordfajl;
int ujfajl = 0;
if((rekordfajl = fopen("rekord.txt", "r")) == NULL) {
ujfajl = 1;
rekordfajl = fopen("rekord.txt", "w");
fclose(rekordfajl);
}
else {
char buf[BUFSIZ];
fgets(buf, BUFSIZ, rekordfajl);
rekord = atoi(buf);
fclose(rekordfajl);
}
if(rekord < pontok) {
rekordfajl = fopen("rekord.txt", "w");
fprintf(rekordfajl, "%d\n", pontok);
fclose(rekordfajl);
ujrekord = 1;
}
vege = 1;
glutTimerFunc(3000, quit, 0);
}
void quit(int val) {
free(snake.reszek);
exit(0);
}
void update_pontok(void) {
char text[BUFSIZ];
sprintf(text, "pontok: %d sebesseg: %d FPS: %d", pontok, snake_speed, fps);
glut_render_fonts(text, 5, 5);
}
/* KAJA */
void kaja_gen(void) {
int i;
kaja.x = rand() % grid_size.x;
kaja.y = rand() % grid_size.y;
for(i = 0; i < snake.hossz; i++)
if(snake.reszek[i].x == kaja.x && snake.reszek[i].y == kaja.y) kaja_gen();
}
void kaja_draw(void) {
glColor3f(1.0f, 0.0f, 0.0f);
draw_quad(kaja);
}
void kaja_init(void) {
uint64_t seed = time(NULL);
srand(seed);
kaja_gen();
}
/* END: KAJA */
/* SNAKE */
void snake_setspeed(void) {
if(snake_speed < 1) snake_speed = 1;
if(snake_speed > 7) snake_speed = 7;
switch(snake_speed) {
case 1: snake.sleep = 0.3; break;
case 2: snake.sleep = 0.2; break;
case 3: snake.sleep = 0.1; break;
case 4: snake.sleep = 0.075; break;
case 5: snake.sleep = 0.05; break;
case 6: snake.sleep = 0.025; break;
case 7: snake.sleep = 0.010; break;
}
}
void snake_init(void) {
if((snake.reszek = (point_t *)malloc(reszek_kezdo * sizeof(point_t))) == NULL) exit(EXIT_FAILURE);
snake.hossz = reszek_kezdo;
snake.irany = DIRECTION_RIGHT;
snake_setspeed();
int i;
for(i = 0; i < reszek_kezdo; i++) {
snake.reszek[i].x = 1 + reszek_kezdo - i;
snake.reszek[i].y = grid_size.y / 2;
}
}
void snake_novel(point_t oldlast) {
if((snake.reszek = (point_t *)realloc(snake.reszek, ++snake.hossz * sizeof(point_t))) == NULL) exit(-1);
snake.reszek[snake.hossz - 1] = oldlast;
}
void snake_draw(void) {
glColor3f(0.0f, 1.0f, 0.0f);
int i;
for(i = 0; i < snake.hossz; i++) draw_quad(snake.reszek[i]);
}
void snake_update(int val) {
point_t oldlast = snake.reszek[snake.hossz - 1];
int i;
for(i = snake.hossz - 1; i > 0; i--) {
snake.reszek[i].x = snake.reszek[i-1].x;
snake.reszek[i].y = snake.reszek[i-1].y;
}
switch(snake.irany) {
case DIRECTION_UP:
snake.reszek[0].y--;
break;
case DIRECTION_DOWN:
snake.reszek[0].y++;
break;
case DIRECTION_LEFT:
snake.reszek[0].x--;
break;
case DIRECTION_RIGHT:
snake.reszek[0].x++;
break;
}
// Falon athaladas
if(falon_atmegy) {
if(snake.reszek[0].x >= grid_size.x) snake.reszek[i].x -= grid_size.x;
if(snake.reszek[0].y >= grid_size.y) snake.reszek[i].y -= grid_size.y;
if(snake.reszek[0].x < 0) snake.reszek[i].x += grid_size.x;
if(snake.reszek[0].y < 0) snake.reszek[i].y += grid_size.y;
}
else {
if(snake.reszek[0].x >= grid_size.x || snake.reszek[0].x < 0 || snake.reszek[0].y >= grid_size.y || snake.reszek[0].y < 0) gameover();
}
// Onmagaba utkozes
for(i = 1; i < snake.hossz; i++)
if(snake.reszek[0].x == snake.reszek[i].x && snake.reszek[0].y == snake.reszek[i].y) gameover();
// Kaja
if(snake.reszek[0].x == kaja.x && snake.reszek[0].y == kaja.y) {
pontok += snake_speed; // Pont osztas sebessegtol fuggoen
snake_novel(oldlast);
kaja_gen();
}
ment = 1;
update(0);
glutTimerFunc(snake.sleep * 1000, snake_update, 0);
}
/* END: SNAKE */
/* FPS CALCULATOR */
void calcFPS(int ign) {
fps = frames;
frames = 0;
glutTimerFunc(1000, calcFPS, 0);
}
/* GLUT */
void glut_draw(void) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
if(!vege) {
snake_draw();
kaja_draw();
update_pontok();
frames++;
}
else {
char text[BUFSIZ];
if(ujrekord) sprintf(text, "Jatek vege! pontok: %d Uj rekord!", pontok);
else sprintf(text, "Jatek vege! pontok: %d rekord: %d", pontok, rekord);
glut_render_fonts(text, 20, grid_size.y*5);
}
glutSwapBuffers();
}
void glut_keyboard(unsigned char key, int x, int y) {
if(key == 'q' || key == 27) exit(0);
if(key == '+') { if(snake_speed < 7) snake_speed++; snake_setspeed(); }
if(key == '-') { if(snake_speed > 0) snake_speed--; snake_setspeed(); }
}
void glut_special(int key, int x, int y) {
if(key == GLUT_KEY_UP && snake.irany != DIRECTION_DOWN && ment) {
snake.irany = DIRECTION_UP;
ment = 0;
}
if(key == GLUT_KEY_DOWN && snake.irany != DIRECTION_UP && ment) {
snake.irany = DIRECTION_DOWN;
ment = 0;
}
if(key == GLUT_KEY_LEFT && snake.irany != DIRECTION_RIGHT && ment) {
snake.irany = DIRECTION_LEFT;
ment = 0;
}
if(key == GLUT_KEY_RIGHT && snake.irany != DIRECTION_LEFT && ment) {
snake.irany = DIRECTION_RIGHT;
ment = 0;
}
}
void glut_reshape(int width, int height) {
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
}
void glut_render_fonts(char *text, int x, int y) {
glColor3f(1.0f, 1.0f, 1.0f);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0.0, grid_size.x*quad_size, 0.0, grid_size.y*quad_size);
glRasterPos2i(x, y);
void *font = GLUT_BITMAP_9_BY_15;
while(*text) glutBitmapCharacter(font, *text++);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
}
void update(int val) {
glutPostRedisplay();
}
/* END: GLUT */