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#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include "./constants.h"
#include "./structs.h"
#include "./game_time.h"
#include "./sound.h"
#include "./color.h"
extern App app;
game_object ball;
game_object paddle1;
game_object paddle2;
int player1_score;
int player2_score;
float speed_up_factor;
float delta_time;
float serve_timer;
float collision_timer;
float winner_timer;
void init_pong();
void init_ball();
void init_paddles();
void update();
void update_ball(float dt);
void do_ball_collision(game_object* paddle);
void update_paddles(float dt);
void do_serve(void);
void do_goal(int* score_to_update);
void do_winner(void);
void render();
void draw_center_line();
void draw_score();
void init_pong() {
app.input = 0;
player1_score = 0;
player2_score = 0;
init_ball();
init_paddles();
init_sounds();
app.update = update;
app.render = render;
}
void init_ball() {
const game_object BALL_TEMPLATE = {
{
BALL_INIT_X,
BALL_INIT_Y,
BALL_RADIUS,
BALL_RADIUS
},
0,
0,
0
};
ball = BALL_TEMPLATE;
speed_up_factor = -1.05;
}
void init_paddles() {
const game_object PADDLE_TEMPLATE = {
{
0,
PADDLE_Y,
PADDLE_WIDTH,
PADDLE_HEIGHT
},
0,
0,
0
};
paddle1 = paddle2 = PADDLE_TEMPLATE;
paddle1.rect.x = PADDLE1_X;
paddle2.rect.x = PADDLE2_X;
}
void do_ball_collision(game_object* paddle) {
if(ball.timer >= 1) {
ball.dx *= speed_up_factor;
ball.dy = (WINDOW_HEIGHT * 0.015) * -((paddle->rect.y + paddle->rect.h / 2) - ball.rect.y);
play_sound(0, -1);
ball.timer = 0;
}
}
void update_ball(float dt) {
// serve ball if not moving
if( ball.dx == 0 ) { do_serve(); }
// check for collision with paddles
if(SDL_HasIntersection(&ball.rect, &paddle1.rect)) { do_ball_collision(&paddle1); }
if(SDL_HasIntersection(&ball.rect, &paddle2.rect)) { do_ball_collision(&paddle2); }
// check for collision with top and bottom of screen
if(ball.rect.y + ball.rect.h >= WINDOW_HEIGHT || ball.rect.y <= 0) { ball.dy *= -1; }
// check for exit off right or left of screen
if(ball.rect.x > WINDOW_WIDTH) { do_goal(&player1_score); }
if(ball.rect.x + ball.rect.w < 0) { do_goal(&player2_score); }
// update ball's position
ball.rect.x += ball.dx * dt;
ball.rect.y += ball.dy * dt;
}
void update_paddles(float dt) {
// reset paddles' movement vectors, adjust according to input
paddle1.dy = 0;
paddle2.dy = 0;
if(app.input & PADDLE_1_UP && paddle1.rect.y >= 0) { paddle1.dy = -PADDLE_SPEED; }
if(app.input & PADDLE_1_DOWN &&
paddle1.rect.y + paddle1.rect.h <= WINDOW_HEIGHT) { paddle1.dy = PADDLE_SPEED; }
if(app.input & PADDLE_2_UP && paddle2.rect.y >= 0) { paddle2.dy = -PADDLE_SPEED; }
if(app.input & PADDLE_2_DOWN &&
paddle2.rect.y + paddle2.rect.h <= WINDOW_HEIGHT) { paddle2.dy = PADDLE_SPEED; }
// update paddles' positions
paddle1.rect.y += paddle1.dy * dt;
paddle2.rect.y += paddle2.dy * dt;
ball.timer += dt;
}
void do_goal(int* score_to_update) {
++*score_to_update;
init_ball();
init_paddles();
if(*score_to_update >= 5) { do_winner(); }
}
void do_winner() {
init_pong();
if(player1_score > player2_score) {
SDL_Log("PLAYER 1 WINS!!!");
}
else {
SDL_Log("PLAYER 2 WINS!!!");
}
}
void do_serve(void) {
if(ball.timer >= 3) {
if (SDL_GetTicks() % 2 == 0) {
ball.dx = BALL_INIT_SPEED;
}
else {
ball.dx = -BALL_INIT_SPEED;
}
}
}
void update() {
delay();
delta_time = get_delta_time();
update_ball(delta_time);
update_paddles(delta_time);
}
void draw_center_line(void) {
for(int i = -CENTER_LINE_HEIGHT / 2; i < WINDOW_HEIGHT; i += CENTER_LINE_HEIGHT * 2) {
SDL_Rect center_line_rect = {
WINDOW_WIDTH / 2 - CENTER_LINE_WIDTH / 2,
i,
CENTER_LINE_WIDTH,
CENTER_LINE_HEIGHT
};
SDL_RenderFillRect(app.renderer, ¢er_line_rect);
}
}
void draw_score(void) {
for(int i = 0; i != player1_score; ++i) {
SDL_Rect score_tally_rect = {
PLAYER1_SCORE_TALLY_X + i * WINDOW_WIDTH / 16,
SCORE_TALLY_Y,
SCORE_TALLY_WIDTH,
SCORE_TALLY_HEIGHT
};
SDL_RenderFillRect(app.renderer, &score_tally_rect);
}
for(int i = 0; i != player2_score; ++i) {
SDL_Rect score_tally_rect = {
PLAYER2_SCORE_TALLY_X - i * WINDOW_WIDTH / 16,
SCORE_TALLY_Y,
SCORE_TALLY_WIDTH,
SCORE_TALLY_HEIGHT
};
SDL_RenderFillRect(app.renderer, &score_tally_rect);
}
}
void draw_message(void) {
SDL_Texture* font = IMG_LoadTexture(app.renderer, "./gfx/90.png");
SDL_RenderCopy(app.renderer, font, NULL, NULL);
}
void render(void) {
// fill screen
SDL_SetRenderDrawColor(app.renderer, COLOR_BG.r, COLOR_BG.g, COLOR_BG.b, COLOR_BG.a);
SDL_RenderClear(app.renderer);
// draw ball, paddles
SDL_SetRenderDrawColor(app.renderer, COLOR_FG.r, COLOR_FG.g, COLOR_FG.b, COLOR_FG.a);
SDL_RenderFillRect(app.renderer, &ball.rect);
SDL_RenderFillRect(app.renderer, &paddle1.rect);
SDL_RenderFillRect(app.renderer, &paddle2.rect);
// draw center line, dividing the play field
draw_center_line();
// draw score tally
draw_score();
// draw serve, goal, or winner message
// draw_message();
// present rendered scene
SDL_RenderPresent(app.renderer);
}
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