townengine/apps/demos/bunnymark/game.c

#include "twn_game_api.h"
#include "state.h"

#include <complex.h>
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>

#define GRAY ((Color){130, 130, 130, 255})
#define BLACK ((Color){0, 0, 0, 255})

#define LEFT_CLICK_ADD 20
#define RIGHT_CLICK_ADD 500


void handle_input(void)
{
    State *state = ctx.udata;
    if (ctx.input.mouse_state == 1 && ctx.input.mouse_window_position.y > 60)
    { // Left click
        for (int i = 0; i < LEFT_CLICK_ADD; i++)
        {
            if (state->bunniesCount < MAX_BUNNIES)
            {
                state->bunnies[state->bunniesCount].position =
                    (Vec2){(float)ctx.input.mouse_window_position.x, (float)ctx.input.mouse_window_position.y};
                state->bunnies[state->bunniesCount].speed.x = (float)(rand() % 500 - 250) / 60.0;
                state->bunnies[state->bunniesCount].speed.y = (float)(rand() % 500 - 250) / 60.0;
                state->bunnies[state->bunniesCount].color =
                    (Color){rand() % 190 + 50, rand() % 160 + 80, rand() % 140 + 100, 255};
                state->bunniesCount++;
            }
        }
    }

    if (ctx.input.mouse_state == 4)
    { // Right click
        for (int i = 0; i < RIGHT_CLICK_ADD; i++)
        {
            if (state->bunniesCount < MAX_BUNNIES)
            {
                state->bunnies[state->bunniesCount].position =
                    (Vec2){(float)ctx.input.mouse_window_position.x, (float)ctx.input.mouse_window_position.y};
                state->bunnies[state->bunniesCount].speed.x = (float)(rand() % 500 - 250) / 60.0;
                state->bunnies[state->bunniesCount].speed.y = (float)(rand() % 500 - 250) / 60.0;
                state->bunnies[state->bunniesCount].color =
                    (Color){rand() % 190 + 50, rand() % 160 + 80, rand() % 140 + 100, 255};
                state->bunniesCount++;
            }
        }
    }
}

void game_tick(void)
{
    static char bunny_count_text[64];
    static char bunny_path[64] = "wabbit_alpha.png";

    // State *state = ctx.udata;
    if (ctx.initialization_needed)
    { // First tick, initalizing data
        // Allocating State struct to store data there
        if (!ctx.udata)
            ctx.udata = ccalloc(1, sizeof(State));
        ((State *)ctx.udata)->bunniesCount = 0;
    }

    State *state = ctx.udata;

    const double delta =
        (double)(ctx.delta_time) / 1000.0; // Receiving floating point delta value (diving by 1000 based on vibe)

    for (int i = 0; i < state->bunniesCount; i++)
    {
        state->bunnies[i].position.x += state->bunnies[i].speed.x;
        state->bunnies[i].position.y += state->bunnies[i].speed.y;

        if (((state->bunnies[i].position.x + BUNNY_W / 2) > ctx.window_w) ||
            ((state->bunnies[i].position.x + BUNNY_W / 2) < 0))
            state->bunnies[i].speed.x *= -1;
        if (((state->bunnies[i].position.y + BUNNY_H / 2) > ctx.window_h) ||
            ((state->bunnies[i].position.y + BUNNY_H / 2 - 60) < 0))
            state->bunnies[i].speed.y *= -1;
    }

    handle_input();

    // Clear window with Gray color (set the background color this way)
    draw_rectangle((Rect){0, 0, ctx.window_w, ctx.window_h}, GRAY);

    for (int i = 0; i < state->bunniesCount; i++)
    { // Draw each bunny based on their position and color, also scale accordingly
        m_sprite(m_set(path, bunny_path),
                 m_set(rect, ((Rect){.x = (int)state->bunnies[i].position.x,
                                     .y = (int)state->bunnies[i].position.y,
                                     .w = BUNNY_W * SPRITE_SCALE,
                                     .h = BUNNY_H * SPRITE_SCALE})),
                 m_opt(color, (state->bunnies[i].color)), m_opt(stretch, true), );
    }
    // Formatting text to display, might want to add FPS here too
    snprintf(bunny_count_text, 64, "Bunnies: %d", state->bunniesCount);

    draw_text(bunny_count_text, (Vec2){0, 0}, 40, BLACK, "/fonts/kenney-pixel.ttf");
}

void game_end(void)
{
    State *state = ctx.udata;

    // Free state when game ends
    free(state);
}