Add in-game level editor with auto-discovered tile/entity palettes
Implements a full level editor that runs inside the game engine as an alternative mode, accessible via --edit flag or E key during gameplay. The editor auto-discovers available tiles from the tileset texture and entities from a new central registry, so adding new game content automatically appears in the editor without any editor-specific changes. Editor features: tile painting (pencil/eraser/flood fill) across 3 layers, entity placement with drag-to-move, player spawn point tool, camera pan/zoom, grid overlay, .lvl save/load, map resize, and test play (P to play, ESC to return to editor). Supporting changes: - Entity registry centralizes spawn functions (replaces strcmp chain) - Mouse input + raw keyboard access added to input system - Camera zoom support for editor overview - Zoom-aware rendering in tilemap, renderer, and sprite systems - Powerup and drone sprites/animations wired up (were defined but unused) - Bitmap font renderer for editor UI (4x6 pixel glyphs, no dependencies)
This commit is contained in:
Thomas
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src/game/drone.c
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217
src/game/drone.c
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#include "game/drone.h"
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#include "game/sprites.h"
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#include "game/projectile.h"
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#include "engine/renderer.h"
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#include "engine/particle.h"
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#include "engine/physics.h"
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#include <stdlib.h>
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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/* ── Stashed entity manager ────────────────────────── */
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static EntityManager *s_em = NULL;
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/* ── Helpers ───────────────────────────────────────── */
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/* Find the active player entity */
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static Entity *find_player(void) {
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if (!s_em) return NULL;
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for (int i = 0; i < s_em->count; i++) {
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Entity *e = &s_em->entities[i];
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if (e->active && e->type == ENT_PLAYER) return e;
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}
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return NULL;
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}
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/* Find nearest enemy within range */
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static Entity *find_nearest_enemy(Vec2 from, float range) {
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if (!s_em) return NULL;
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Entity *best = NULL;
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float best_dist = range * range;
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for (int i = 0; i < s_em->count; i++) {
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Entity *e = &s_em->entities[i];
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if (!e->active || e->health <= 0) continue;
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if (e->type != ENT_ENEMY_GRUNT && e->type != ENT_ENEMY_FLYER &&
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e->type != ENT_TURRET) continue;
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Vec2 epos = vec2(e->body.pos.x + e->body.size.x * 0.5f,
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e->body.pos.y + e->body.size.y * 0.5f);
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float dx = epos.x - from.x;
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float dy = epos.y - from.y;
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float dist2 = dx * dx + dy * dy;
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if (dist2 < best_dist) {
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best_dist = dist2;
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best = e;
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}
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}
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return best;
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}
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/* ── Callbacks ─────────────────────────────────────── */
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static void drone_update(Entity *self, float dt, const Tilemap *map) {
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(void)map;
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DroneData *dd = (DroneData *)self->data;
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if (!dd) return;
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/* Countdown lifetime */
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dd->lifetime -= dt;
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if (dd->lifetime <= 0) {
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/* Expiry: death particles and destroy */
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Vec2 center = vec2(
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self->body.pos.x + self->body.size.x * 0.5f,
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self->body.pos.y + self->body.size.y * 0.5f
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);
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particle_emit_spark(center, (SDL_Color){50, 200, 255, 255});
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self->flags |= ENTITY_DEAD;
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return;
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}
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/* Follow player — orbit around player center */
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Entity *player = find_player();
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if (!player) return;
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Vec2 pcenter = vec2(
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player->body.pos.x + player->body.size.x * 0.5f,
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player->body.pos.y + player->body.size.y * 0.5f
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);
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dd->orbit_angle += DRONE_ORBIT_SPEED * dt;
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if (dd->orbit_angle > 2.0f * (float)M_PI)
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dd->orbit_angle -= 2.0f * (float)M_PI;
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float target_x = pcenter.x + cosf(dd->orbit_angle) * DRONE_ORBIT_RADIUS;
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float target_y = pcenter.y + sinf(dd->orbit_angle) * DRONE_ORBIT_RADIUS;
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/* Smooth movement toward orbit position */
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float lerp = 8.0f * dt;
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if (lerp > 1.0f) lerp = 1.0f;
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self->body.pos.x += (target_x - self->body.pos.x - self->body.size.x * 0.5f) * lerp;
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self->body.pos.y += (target_y - self->body.pos.y - self->body.size.y * 0.5f) * lerp;
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/* Shooting */
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dd->shoot_cooldown -= dt;
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if (dd->shoot_cooldown <= 0) {
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Vec2 drone_center = vec2(
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self->body.pos.x + self->body.size.x * 0.5f,
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self->body.pos.y + self->body.size.y * 0.5f
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);
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Entity *target = find_nearest_enemy(drone_center, DRONE_SHOOT_RANGE);
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if (target) {
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Vec2 tcenter = vec2(
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target->body.pos.x + target->body.size.x * 0.5f,
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target->body.pos.y + target->body.size.y * 0.5f
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);
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Vec2 dir = vec2(tcenter.x - drone_center.x, tcenter.y - drone_center.y);
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/* Spawn projectile from drone, counted as player bullet */
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projectile_spawn_def(s_em, &WEAPON_PLASMA,
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drone_center, dir, true);
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dd->shoot_cooldown = DRONE_SHOOT_CD;
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/* Muzzle flash */
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particle_emit_muzzle_flash(drone_center, dir);
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}
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}
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/* Trail particles — subtle engine glow */
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if ((int)(dd->lifetime * 10.0f) % 3 == 0) {
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Vec2 center = vec2(
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self->body.pos.x + self->body.size.x * 0.5f,
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self->body.pos.y + self->body.size.y * 0.5f
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);
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ParticleBurst b = {
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.origin = center,
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.count = 1,
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.speed_min = 5.0f,
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.speed_max = 15.0f,
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.life_min = 0.1f,
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.life_max = 0.3f,
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.size_min = 1.0f,
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.size_max = 1.5f,
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.spread = (float)M_PI * 2.0f,
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.direction = 0,
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.drag = 3.0f,
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.gravity_scale = 0.0f,
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.color = (SDL_Color){50, 180, 255, 150},
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.color_vary = true,
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};
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particle_emit(&b);
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}
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/* Blink when about to expire (last 3 seconds) */
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animation_update(&self->anim, dt);
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}
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static void drone_render(Entity *self, const Camera *cam) {
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(void)cam;
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DroneData *dd = (DroneData *)self->data;
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if (!dd) return;
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/* Blink when about to expire */
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if (dd->lifetime < 3.0f) {
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int blink = (int)(dd->lifetime * 8.0f);
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if (blink % 2 == 0) return; /* skip rendering every other frame */
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}
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if (!g_spritesheet || !self->anim.def) return;
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SDL_Rect src = animation_current_rect(&self->anim);
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Body *body = &self->body;
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/* Center sprite on hitbox */
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float draw_x = body->pos.x + body->size.x * 0.5f - SPRITE_CELL * 0.5f;
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float draw_y = body->pos.y + body->size.y * 0.5f - SPRITE_CELL * 0.5f;
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Sprite spr = {
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.texture = g_spritesheet,
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.src = src,
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.pos = vec2(draw_x, draw_y),
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.size = vec2(SPRITE_CELL, SPRITE_CELL),
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.flip_x = false,
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.flip_y = false,
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.layer = LAYER_ENTITIES,
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.alpha = 255,
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};
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renderer_submit(&spr);
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}
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static void drone_destroy(Entity *self) {
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free(self->data);
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self->data = NULL;
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}
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/* ── Public API ────────────────────────────────────── */
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void drone_register(EntityManager *em) {
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entity_register(em, ENT_DRONE, drone_update, drone_render, drone_destroy);
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s_em = em;
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}
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Entity *drone_spawn(EntityManager *em, Vec2 player_pos) {
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Entity *e = entity_spawn(em, ENT_DRONE, player_pos);
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if (!e) return NULL;
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e->body.size = vec2(10.0f, 10.0f);
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e->body.gravity_scale = 0.0f; /* floats freely */
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e->health = 99; /* practically invulnerable */
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e->max_health = 99;
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e->damage = 0;
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e->flags |= ENTITY_INVINCIBLE;
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DroneData *dd = calloc(1, sizeof(DroneData));
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dd->orbit_angle = 0.0f;
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dd->shoot_cooldown = 0.5f; /* short initial delay */
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dd->lifetime = DRONE_DURATION;
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e->data = dd;
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animation_set(&e->anim, &anim_drone);
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/* Spawn burst */
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particle_emit_spark(player_pos, (SDL_Color){50, 200, 255, 255});
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printf("Drone deployed! (%0.0fs)\n", DRONE_DURATION);
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return e;
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}
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