tinyswords/main.c

#include "include/raylib.h"
#include "include/raymath.h"
#include <stdlib.h>
#include <stdbool.h>

#define TEXTURES_BUF_SIZE 16
#define TARGET_FPS 60
#define ANIM_SPEED 8
#define MAX_ANIMATION_PLAYBACKS 64

#include "sprites.h"
#include "lib.h"
#include "game_data.h"

typedef enum KnightState {
    KNIGHT_IDLE = 0,
    KNIGHT_RUNNING = 1,
    KNIGHT_ATTACKING = 2,
} KnightState;

typedef enum Direction {
    DIR_UP = 0,
    DIR_DOWN = 1,
    DIR_LEFT = 2,
    DIR_RIGHT = 3,
    // DIR_UP_LEFT = 4,
    // DIR_UP_RIGHT = 5,
    // DIR_DOWN_LEFT = 6,
    // DIR_DOWN_RIGHT = 7,
} Direction;

typedef struct {
    Vector2 position;
    Vector2 velocity;
    Direction look_dir;
    KnightState state;
} Knight;

typedef struct {
    int frame_count;
    Knight knight;
    Rectangle *sprite_rects;
    SpriteAnimationPlayback *anim_playbacks;
    int anim_playbacks_count;
} GameState;

typedef struct {
    Texture2D *textures;
} Assets;

Assets Init() {
    knight_anims[ANIM_KNIGHT_IDLE] = knight_idle;
    knight_anims[ANIM_KNIGHT_RUN] = knight_run;
    knight_anims[ANIM_KNIGHT_ATTACK_SIDE1] = knight_attack_side1;
    knight_anims[ANIM_KNIGHT_ATTACK_SIDE2] = knight_attack_side2;
    knight_anims[ANIM_KNIGHT_ATTACK_TOP1 ] = knight_attack_front1;
    knight_anims[ANIM_KNIGHT_ATTACK_TOP2 ] = knight_attack_front2;
    knight_anims[ANIM_KNIGHT_ATTACK_BACK1] = knight_attack_back1;
    knight_anims[ANIM_KNIGHT_ATTACK_BACK2] = knight_attack_back2;

    Assets assets = { 0 };
    assets.textures = malloc(sizeof(Texture2D) * TEXTURES_BUF_SIZE);
    assets.textures[0] = LoadTexture("assets/Terrain/Ground/Tilemap_Flat.png");
    assets.textures[1] =
        LoadTexture("assets/Factions/Knights/Troops/Warrior/Blue/Warrior_Blue.png");
    return assets;
}

void Update(GameState *game, Camera2D cam, float dt) {
    (void)cam;

    TickSpriteAnimations(&knight_anims[0], game->anim_playbacks, 1);

    float movement_speed = 250.0f * dt;
    Vector2 input_vel = {0};
    if (IsKeyDown(KEY_RIGHT) || IsKeyDown(KEY_D)) {
        input_vel.x = 1;
    }
    if (IsKeyDown(KEY_LEFT) || IsKeyDown(KEY_A)) {
        input_vel.x = -1;
    }
    if (IsKeyDown(KEY_UP) || IsKeyDown(KEY_W)) {
        input_vel.y = -1;
    }
    if (IsKeyDown(KEY_DOWN) || IsKeyDown(KEY_S)) {
        input_vel.y = 1;
    }
    if (IsKeyPressed(KEY_SPACE) && game->knight.state != KNIGHT_ATTACKING) {
        game->knight.state = KNIGHT_ATTACKING;
        game->anim_playbacks[0].anim_id = ANIM_KNIGHT_ATTACK_SIDE1;
        PlayAnimation(&game->anim_playbacks[0], game->anim_playbacks[0]);
    }
    if (game->knight.state == KNIGHT_ATTACKING) {
        game->anim_playbacks[0].anim_id = ANIM_KNIGHT_ATTACK_SIDE1;
        if (game->anim_playbacks[0].is_finished) {
            game->knight.state = KNIGHT_IDLE;
        }
    } else {
        if (input_vel.x != 0) {
            game->knight.look_dir = input_vel.x == -1 ? DIR_LEFT : DIR_RIGHT;
        }
        game->knight.velocity = Vector2Normalize(input_vel);
        game->knight.velocity = Vector2Scale(game->knight.velocity, movement_speed);
        game->knight.position = Vector2Add(game->knight.position, game->knight.velocity);
        if (input_vel.x != 0 || input_vel.y != 0) {
            game->anim_playbacks[0].anim_id = ANIM_KNIGHT_RUN;
            game->knight.state = KNIGHT_RUNNING;
        } else {
            game->anim_playbacks[0].anim_id = ANIM_KNIGHT_IDLE;
            game->knight.state = KNIGHT_IDLE;
        }
    }
}

void Draw(GameState *game, Assets assets, Camera2D cam, float dt) {
    (void)cam;
    (void)dt;
    ClearBackground((Color){ 100, 149, 237, 255 });

    int size = 32;
    int topx = 300;
    int topy = 32;
    for (int col = 0; col < size; col++) {
        for (int row = 0; row < size; row++) {
            int atlas_col = 0;
            int atlas_row = 0;
            if (col == size - 1) {
                atlas_col = 5;
            } else if (col > 0) {
                atlas_col = (col % 4) + 1;
            }
            if (row == size - 1) {
                atlas_row = 5;
            } else if (row > 0) {
                atlas_row = (row % 4) + 1;
            }
            Vector2 pos = {32 * col + topx, 32 * row + topy};
            Rectangle src_rect = {32 * atlas_col, 32 * atlas_row, 32, 32};
            DrawTextureRec(assets.textures[0], src_rect, pos, WHITE);
        }
    }
    for (int i = 0; i < game->anim_playbacks_count; i++) {
        SpriteAnimationPlayback *playback = &game->anim_playbacks[i];
        SpriteAnimation *anim = &knight_anims[playback->anim_id];
        Rectangle src_rect = anim->src_rect;
        src_rect.x = playback->current_frame * anim->src_rect.width;
        src_rect.y = anim->src_rect.y;
        if (game->knight.look_dir == DIR_LEFT) {
            src_rect.width = -abs((int)src_rect.width);
        }
        DrawTextureRec(assets.textures[1], src_rect, game->knight.position, WHITE);
    }
}

int main(void) {
    const int screen_width = 1600;
    const int screen_height = 1080;

    InitWindow(screen_width, screen_height, "raylib [core] example - basic window");

    int monitor = GetCurrentMonitor();
    int monitor_width = GetMonitorWidth(monitor);
    int monitor_height = GetMonitorHeight(monitor);
    int win_pos_x = monitor_width / 2 - screen_width / 2;
    int win_pos_y = monitor_height / 2 - screen_height / 2;
    SetWindowPosition(win_pos_x, win_pos_y);

    SetTargetFPS(TARGET_FPS);

    Camera2D cam = {0};
    cam.zoom = 1.0f;

    GameState game = {0};
    game.anim_playbacks = malloc(sizeof(SpriteAnimationPlayback) * MAX_ANIMATION_PLAYBACKS);
    game.anim_playbacks_count = 1;
    // First one is idle
    game.anim_playbacks[0] = (SpriteAnimationPlayback){0};
    game.knight = (Knight){0};
    // state.anim_playbacks[0].pos = (Position){ knight_idle.src_rect.x, knight_idle.src_rect.y };

    Assets assets = Init();

    PlayAnimation(&game.anim_playbacks[0], game.anim_playbacks[0]);
    // const int idle
    while (!WindowShouldClose()) {
        game.frame_count++;
        float dt = GetFrameTime();

        Update(&game, cam, dt);

        BeginDrawing();
        {
            BeginMode2D(cam);
            {
                Draw(&game, assets, cam, dt);
            }
            EndMode2D();
        }
        EndDrawing();
    }

    for (int i = 0; i < TEXTURES_BUF_SIZE; i++) {
        UnloadTexture(assets.textures[0]);
    }
    free(assets.textures);
    CloseWindow();
    return 0;
}