Initial commit.
This commit is contained in:
317
pingpong.c
Normal file
317
pingpong.c
Normal file
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#include <stdio.h>
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#include <SDL2/SDL.h>
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#include <SDL_ttf.h>
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#define TRUE 1
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#define FALSE 0
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#define WINDOW_WIDTH 800
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#define WINDOW_HEIGHT 600
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#define FPS 120
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#define TARGET_FRAME_TIME (1000 / FPS)
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typedef struct game_state {
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int is_running;
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int last_frame_time;
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struct ball {
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float x;
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float y;
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float width;
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float height;
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float acceleration_x;
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float acceleration_y;
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} ball;
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struct player {
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float x;
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float y;
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float width;
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float height;
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float acceleration_y;
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int score;
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int up;
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int down;
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} player_one, player_two;
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} game_state;
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void initialize_window(SDL_Window **window, SDL_Renderer **renderer)
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{
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if(SDL_Init(SDL_INIT_EVERYTHING) != 0) {
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fprintf(stderr, "Error initializing SDL.\n");
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exit(1);
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}
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*window = SDL_CreateWindow(
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NULL,
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SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
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WINDOW_WIDTH, WINDOW_HEIGHT,
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SDL_WINDOW_SHOWN);
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if(!window) {
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fprintf(stderr, "Error creating SDL Window.\n");
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exit(1);
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}
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*renderer = SDL_CreateRenderer(*window, -1, 0);
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if(!renderer) {
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fprintf(stderr, "Error creating SDL Renderer.\n");
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exit(1);
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}
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}
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void initialized_font(TTF_Font **font)
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{
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if(TTF_Init() < 0) {
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fprintf(stderr, "Error opening font.\n");
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exit(1);
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}
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*font = TTF_OpenFont("./iosevka-bold.ttf", 36);
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if(!font) {
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fprintf(stderr, "Error opening font.\n");
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exit(1);
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}
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}
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void handle_ball(game_state *state, float delta_time)
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{
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if(state->ball.x < state->player_one.x + state->player_one.width &&
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(state->ball.y < state->player_one.y + state->player_one.height &&
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state->ball.y > state->player_one.y))
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{
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state->ball.x = state->player_one.x + state->player_one.width;
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state->ball.acceleration_x *= -1;
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}
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if(state->ball.x + state->ball.width > state->player_two.x &&
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(state->ball.y < state->player_two.y + state->player_two.height &&
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state->ball.y > state->player_two.y))
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{
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state->ball.x = state->player_two.x - state->ball.width;
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state->ball.acceleration_x *= -1;
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}
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if(state->ball.x <= 0) {
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state->ball.x = WINDOW_WIDTH / 2;
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state->ball.y = 0;
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state->player_two.score += 1;
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if(state->player_two.score > 5) {
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state->player_two.score = 1;
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state->player_one.score = 0;
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}
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}
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if(state->ball.x >= WINDOW_WIDTH - state->ball.width) {
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state->ball.x = WINDOW_WIDTH / 2;
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state->ball.y = 0;
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state->player_one.score += 1;
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if(state->player_one.score > 5) {
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state->player_one.score = 1;
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state->player_two.score = 0;
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}
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}
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if(state->ball.y < 0) {
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state->ball.acceleration_y *= -1;
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state->ball.y = 0;
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}
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if(state->ball.y > WINDOW_HEIGHT - state->ball.height) {
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state->ball.acceleration_y *= -1;
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state->ball.y = WINDOW_HEIGHT - state->ball.height;
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}
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state->ball.x += state->ball.acceleration_x * delta_time;
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state->ball.y += state->ball.acceleration_y * delta_time;
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}
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void handle_paddles(game_state *state, float delta_time)
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{
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if(state->player_one.up)
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state->player_one.y -= state->player_one.acceleration_y * delta_time;
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if(state->player_one.down)
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state->player_one.y += state->player_one.acceleration_y * delta_time;
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if(state->player_two.up)
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state->player_two.y -= state->player_one.acceleration_y * delta_time;
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if(state->player_two.down)
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state->player_two.y += state->player_one.acceleration_y * delta_time;
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}
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void render_score(game_state *state, SDL_Renderer *renderer, TTF_Font *font)
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{
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/* Build score strings */
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char *score;
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score = malloc(3*sizeof(char));
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score[0] = (char)(state->player_one.score + 48); /* FIX */
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score[1] = ':';
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score[2] = (char)(state->player_two.score + 48);
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/* Render */
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SDL_Surface *text;
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SDL_Color color = { 198, 204, 215, 255 };
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text = TTF_RenderText_Solid(font, score, color);
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if (!text) {
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fprintf(stderr, "Error initializing Text.\n");
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exit(1);
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}
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SDL_Texture *text_texture;
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text_texture = SDL_CreateTextureFromSurface(renderer, text);
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SDL_Rect dest = { WINDOW_WIDTH/2-20, 10, text->w, text->h };
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SDL_RenderCopy(renderer, text_texture, NULL, &dest);
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/* free */
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SDL_DestroyTexture(text_texture);
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SDL_FreeSurface(text);
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free(score);
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}
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void render_paddles(game_state *state, SDL_Renderer *renderer)
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{
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SDL_Rect player_one_rect = { state->player_one.x, state->player_one.y,
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state->player_one.width, state->player_one.height };
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SDL_Rect player_two_rect = { state->player_two.x, state->player_two.y,
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state->player_two.width, state->player_two.height };
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SDL_SetRenderDrawColor(renderer, 215, 78, 66, 255);
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SDL_RenderFillRect(renderer, &player_one_rect);
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SDL_SetRenderDrawColor(renderer, 16, 133, 255, 255);
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SDL_RenderFillRect(renderer, &player_two_rect);
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}
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void render_ball(game_state *state, SDL_Renderer *renderer)
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{
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SDL_Rect ball_rect = { state->ball.x, state->ball.y, state->ball.width,
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state->ball.height };
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SDL_SetRenderDrawColor(renderer, 198, 204, 215, 255);
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SDL_RenderFillRect(renderer, &ball_rect);
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}
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void setup(game_state *state)
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{
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state->is_running = TRUE;
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state->last_frame_time = 0;
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state->ball.x = 40;
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state->ball.y = 40;
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state->ball.width = 15;
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state->ball.height = 15;
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state->ball.acceleration_x = 300;
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state->ball.acceleration_y = 400;
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state->player_one.x = 10;
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state->player_one.y = 10;
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state->player_one.width = 10;
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state->player_one.height = 100;
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state->player_one.acceleration_y = 500;
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state->player_one.score = 0;
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state->player_one.up = FALSE;
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state->player_one.down = FALSE;
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state->player_two.x = WINDOW_WIDTH - 20;
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state->player_two.y = 10;
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state->player_two.width = 10;
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state->player_two.height = 100;
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state->player_two.acceleration_y = 500;
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state->player_two.score = 0;
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state->player_two.up = FALSE;
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state->player_two.down = FALSE;
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}
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void process_input(game_state *state)
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{
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SDL_Event event;
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const Uint8 *currentKeyStates;
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SDL_PollEvent(&event);
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currentKeyStates = SDL_GetKeyboardState(NULL);
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if(currentKeyStates[SDL_SCANCODE_W]) {
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state->player_one.up = TRUE;
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state->player_one.down = FALSE;
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} else if(currentKeyStates[SDL_SCANCODE_S]) {
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state->player_one.up = FALSE;
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state->player_one.down = TRUE;
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} else {
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state->player_one.up = FALSE;
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state->player_one.down = FALSE;
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}
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if(currentKeyStates[SDL_SCANCODE_UP]) {
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state->player_two.up = TRUE;
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state->player_two.down = FALSE;
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} else if(currentKeyStates[SDL_SCANCODE_DOWN]) {
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state->player_two.up = FALSE;
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state->player_two.down = TRUE;
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} else {
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state->player_two.up = FALSE;
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state->player_two.down = FALSE;
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}
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switch(event.type) {
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case SDL_QUIT:
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state->is_running = FALSE;
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break;
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case SDL_KEYDOWN:
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if(event.key.keysym.sym == SDLK_ESCAPE)
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state->is_running = FALSE;
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break;
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}
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}
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void update(game_state *state)
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{
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int time_to_wait;
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float delta_time;
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time_to_wait = TARGET_FRAME_TIME - (SDL_GetTicks() - state->last_frame_time);
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if(time_to_wait > 0 && time_to_wait <= TARGET_FRAME_TIME)
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SDL_Delay(time_to_wait);
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delta_time = (SDL_GetTicks() - state->last_frame_time) / 1000.0f;
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state->last_frame_time = SDL_GetTicks();
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handle_ball(state, delta_time);
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handle_paddles(state, delta_time);
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}
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void render(game_state *state, SDL_Renderer *renderer, TTF_Font *font)
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{
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SDL_SetRenderDrawColor(renderer, 24, 26, 31, 255);
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SDL_RenderClear(renderer);
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render_paddles(state, renderer);
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render_ball(state, renderer);
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render_score(state, renderer, font);
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SDL_RenderPresent(renderer);
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}
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void destroy_window(SDL_Window *window, SDL_Renderer *renderer)
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{
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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}
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int main()
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{
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game_state state;
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SDL_Window *window = NULL;
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SDL_Renderer *renderer = NULL;
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TTF_Font *font;
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initialize_window(&window, &renderer);
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initialized_font(&font);
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setup(&state);
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while(state.is_running) {
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process_input(&state);
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update(&state);
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render(&state, renderer, font);
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}
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destroy_window(window, renderer);
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return 0;
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}
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