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);
}