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#define SDL_DISABLE_IMMINTRIN_H
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <SDL2/SDL.h>
#define WINDOW_W 800
#define WINDOW_H 600
#define MARGIN 20
#define PLAYER_W 10
#define PLAYER_H 100
#define PLAYER_V 5
#define BALL_SIZE 10
typedef struct {
float x, y;
char dir;
int score;
int stuck;
} Player;
typedef struct {
float x, y;
float vx, vy;
} Ball;
void initBall(Ball *b) {
b->x = WINDOW_W / 2;
b->y = WINDOW_H / 2;
b->vx = 2 * (rand() % 2 ? 1 : -1);
b->vy = 2 * (rand() % 2 ? 1 : -1);
}
int abs(int n) {
return (n >= 0 ? n : -n);
}
void limit(float *n, float min, float max) {
if (abs(*n) > max) *n = *n > 0 ? max : -max;
else if (abs(*n) < min) *n = *n > 0 ? min : -min;
}
float randfloat(float from, float to) {
return from + (to - from) * ((float)rand()/INT_MAX);
}
void collision(Ball *b, Player *p) {
if (b->x + BALL_SIZE >= p->x &&
b->x <= p->x + PLAYER_W &&
b->y + BALL_SIZE >= p->y &&
b->y <= p->y + PLAYER_H) {
if (!p->stuck) {
b->vx = -b->vx;
b->vx *= randfloat(0.5, 1.5);
limit(&b->vx, 4, 8);
b->vy += randfloat(0.2, 0.8) * p->dir;
limit(&b->vy, 2, 8);
p->stuck = 1;
}
}
else {
p->stuck = 0;
}
}
void move(Player *p, float n) {
if (n > 0) p->dir = 1;
else if (n < 0) p->dir = -1;
p->y += n;
if (p->y > WINDOW_H - PLAYER_H) {
p->y = WINDOW_H - PLAYER_H;
p->dir = 0;
}
else if (p->y < 0) {
p->y = 0;
p->dir = 0;
}
}
void input(Player *p) {
const Uint8 *state = SDL_GetKeyboardState(0);
if (state[SDL_SCANCODE_UP])
move(p, -PLAYER_V);
else if (state[SDL_SCANCODE_DOWN])
move(p, PLAYER_V);
else
p->dir = 0;
}
void ai(Ball *b, Player *p) {
if (abs(b->x - p->x) < 300) {
if (b->y - p->y > PLAYER_H - 10 - BALL_SIZE)
move(p, PLAYER_V);
else if (b->y - p->y < 10)
move(p, -PLAYER_V);
}
else {
if (p->y >= WINDOW_H * 5 / 6 - PLAYER_H) {
p->dir = -1;
}
else if (p->y <= WINDOW_H / 6) {
p->dir = 1;
}
move(p, p->dir * PLAYER_V);
}
}
void update(Ball *b, Player *p1, Player *p2) {
b->x += b->vx;
b->y += b->vy;
if (b->y < 0 || b->y + BALL_SIZE > WINDOW_H)
b->vy = -b->vy;
if (b->x < 0) {
p2->score++;
initBall(b);
}
if (b->x + BALL_SIZE > WINDOW_W) {
p1->score++;
initBall(b);
}
if (p1->score > 5 || p2->score > 5) {
p1->score = 0;
p2->score = 0;
}
collision(b, p1);
collision(b, p2);
input(p1);
ai(b, p2);
}
void render(SDL_Renderer *r, Ball *b, Player *p1, Player *p2) {
SDL_SetRenderDrawColor(r, 0, 0, 0, 255);
SDL_RenderClear(r);
SDL_SetRenderDrawColor(r, 40, 40, 40, 255);
SDL_Rect canvas = {0, 0, WINDOW_W, WINDOW_H};
SDL_RenderFillRect(r, &canvas);
SDL_SetRenderDrawColor(r, 255, 255, 255, 255);
SDL_Rect net[10];
for (int i = 0; i < 10; i++) {
net[i].x = WINDOW_W / 2;
net[i].y = i * (WINDOW_H / 10) + 10;
net[i].w = 10;
net[i].h = WINDOW_H / 10 - 20;
}
SDL_RenderFillRects(r, net, 10);
SDL_SetRenderDrawColor(r, 255, 255, 255, 255);
SDL_Rect ball_r = {b->x, b->y, BALL_SIZE, BALL_SIZE};
SDL_RenderFillRect(r, &ball_r);
int p1factor = 255 - p1->score * 50;
SDL_SetRenderDrawColor(r, 255, p1factor, p1factor, 255);
SDL_Rect p1_r = {p1->x, p1->y, PLAYER_W, PLAYER_H};
SDL_RenderFillRect(r, &p1_r);
int p2factor = 255 - p2->score * 50;
SDL_SetRenderDrawColor(r, 255, p2factor, p2factor, 255);
SDL_Rect p2_r = {p2->x, p2->y, PLAYER_W, PLAYER_H};
SDL_RenderFillRect(r, &p2_r);
SDL_RenderPresent(r);
SDL_Delay(10);
}
int main() {
srand(time(0));
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *w;
SDL_Renderer *r;
SDL_CreateWindowAndRenderer(WINDOW_W, WINDOW_H, SDL_WINDOW_RESIZABLE, &w, &r);
SDL_RenderSetLogicalSize(r, WINDOW_W, WINDOW_H);
Player p1, p2;
Ball b;
p1.x = MARGIN;
p1.y = WINDOW_H / 2;
p2.x = WINDOW_W - MARGIN - PLAYER_W;
p2.y = WINDOW_H / 2;
p1.score = p2.score = 0;
p1.stuck = p2.stuck = 0;
p1.dir = p2.dir = 0;
initBall(&b);
SDL_Event e;
while (e.type != SDL_QUIT) {
SDL_PollEvent(&e);
update(&b, &p1, &p2);
render(r, &b, &p1, &p2);
}
SDL_DestroyRenderer(r);
SDL_DestroyWindow(w);
SDL_Quit();
return 0;
}
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