Integrate particle system into scenes

Changelog:
- Each scene will have its own particle system to maintain
- Crate destruction now emits particles
- Draw particles during screen renders
    - May want to make this configurable
    - Should be in general scene render

assets_test.c

@@ -43,8 +43,8 @@ int main(void)
             DrawTextEx(*fnt, "Press C to play a sound", (Vector2){64, 64}, 24, 1, RED);
 
             // Draw the static Sprite and animated Sprite
-            draw_sprite(spr, (Vector2){64,128}, false);
-            draw_sprite(spr2, (Vector2){64,180}, true);
+            draw_sprite(spr, (Vector2){64,128}, 0.0f, false);
+            draw_sprite(spr2, (Vector2){64,180}, 0.0f, true);
         EndDrawing();
 
         // Update the animated Sprite

engine/EC.h

@@ -183,6 +183,7 @@ typedef struct Sprite {
     Texture2D* texture;
     Vector2 frame_size;
     Vector2 origin;
+    Vector2 anchor;
     int frame_count;
     int current_frame;
     int elapsed;

engine/assets.c

@@ -8,7 +8,7 @@
 #include "zstd.h"
 #include <stdio.h>
 
-uint8_t n_loaded[5] = {0};
+uint8_t n_loaded[6] = {0};
 
 // Hard limit number of 
 typedef struct TextureData
@@ -36,12 +36,18 @@ typedef struct LevelPackData
     LevelPack_t pack;
     char name[MAX_NAME_LEN];
 }LevelPackData_t;
+typedef struct EmitterConfData
+{
+    EmitterConfig_t conf;
+    char name[MAX_NAME_LEN];
+}EmitterConfData_t;
 
 static TextureData_t textures[MAX_TEXTURES];
 static FontData_t fonts[MAX_FONTS];
 static SoundData_t sfx[MAX_SOUNDS];
 static SpriteData_t sprites[MAX_SPRITES];
 static LevelPackData_t levelpacks[MAX_LEVEL_PACK];
+static EmitterConfData_t emitter_confs[MAX_EMITTER_CONF];
 
 #define DECOMPRESSOR_INBUF_LEN 4096
 #define DECOMPRESSOR_OUTBUF_LEN 4096
@@ -106,7 +112,7 @@ Sprite_t* add_sprite(Assets_t* assets, const char* name, Texture2D* texture)
 {
     uint8_t spr_idx = n_loaded[1];
     assert(spr_idx < MAX_SPRITES);
-    memset(sprites + spr_idx, 0, sizeof(Sprite_t));
+    memset(sprites + spr_idx, 0, sizeof(SpriteData_t));
     sprites[spr_idx].sprite.texture = texture;
     strncpy(sprites[spr_idx].name, name, MAX_NAME_LEN);
     sc_map_put_s64(&assets->m_sprites, sprites[spr_idx].name, spr_idx);
@@ -136,6 +142,18 @@ Font* add_font(Assets_t* assets, const char* name, const char* path)
     return &fonts[fnt_idx].font;
 }
 
+EmitterConfig_t* add_emitter_conf(Assets_t* assets, const char* name, Sprite_t* sprite)
+{
+    uint8_t emitter_idx = n_loaded[5];
+    assert(emitter_idx < MAX_EMITTER_CONF);
+    memset(emitter_confs + emitter_idx, 0, sizeof(EmitterConfData_t));
+    emitter_confs[emitter_idx].conf.spr = sprite;
+    strncpy(emitter_confs[emitter_idx].name, name, MAX_NAME_LEN);
+    sc_map_put_s64(&assets->m_emitter_confs, emitter_confs[emitter_idx].name, emitter_idx);
+    n_loaded[5]++;
+    return &emitter_confs[emitter_idx].conf;
+}
+
 LevelPack_t* add_level_pack(Assets_t* assets, const char* name, const char* path)
 {
     FILE* file = fopen(path, "rb");
@@ -165,6 +183,7 @@ LevelPack_t* add_level_pack(Assets_t* assets, const char* name, const char* path
     return &levelpacks[pack_idx].pack;
 }
 
+
 static LevelPack_t* add_level_pack_zst(Assets_t* assets, const char* name, FILE* file)
 {
     LevelPackData_t* pack_info = levelpacks + n_loaded[4];
@@ -338,6 +357,7 @@ void init_assets(Assets_t* assets)
     sc_map_init_s64(&assets->m_textures, MAX_TEXTURES, 0);
     sc_map_init_s64(&assets->m_sounds, MAX_SOUNDS, 0);
     sc_map_init_s64(&assets->m_levelpacks, MAX_LEVEL_PACK, 0);
+    sc_map_init_s64(&assets->m_emitter_confs, MAX_EMITTER_CONF, 0);
     level_decompressor.ctx = ZSTD_createDCtx();
 }
 
@@ -365,6 +385,7 @@ void free_all_assets(Assets_t* assets)
     sc_map_clear_s64(&assets->m_sounds);
     sc_map_clear_s64(&assets->m_sprites);
     sc_map_clear_s64(&assets->m_levelpacks);
+    sc_map_clear_s64(&assets->m_emitter_confs);
     memset(n_loaded, 0, sizeof(n_loaded));
 }
 
@@ -376,6 +397,7 @@ void term_assets(Assets_t* assets)
     sc_map_term_s64(&assets->m_sounds);
     sc_map_term_s64(&assets->m_sprites);
     sc_map_term_s64(&assets->m_levelpacks);
+    sc_map_term_s64(&assets->m_emitter_confs);
     ZSTD_freeDCtx(level_decompressor.ctx);
 }
 
@@ -399,6 +421,17 @@ Sprite_t* get_sprite(Assets_t* assets, const char* name)
     return NULL;
 }
 
+EmitterConfig_t* get_emitter_conf(Assets_t* assets, const char* name)
+{
+    uint8_t emitter_idx = sc_map_get_s64(&assets->m_emitter_confs, name);
+    if (sc_map_found(&assets->m_emitter_confs))
+    {
+        return &emitter_confs[emitter_idx].conf;
+    }
+    return NULL;
+}
+
+
 Sound* get_sound(Assets_t* assets, const char* name)
 {
     uint8_t snd_idx = sc_map_get_s64(&assets->m_sounds, name);
@@ -429,7 +462,7 @@ LevelPack_t* get_level_pack(Assets_t* assets, const char* name)
     return NULL;
 }
 
-void draw_sprite(Sprite_t* spr, Vector2 pos, bool flip_x)
+void draw_sprite(Sprite_t* spr, Vector2 pos, float rotation, bool flip_x)
 {
     Rectangle rec = {
         spr->origin.x + spr->frame_size.x * spr->current_frame,
@@ -437,5 +470,18 @@ void draw_sprite(Sprite_t* spr, Vector2 pos, bool flip_x)
         spr->frame_size.x * (flip_x ? -1:1),
         spr->frame_size.y
     };
-    DrawTextureRec(*spr->texture, rec, pos, WHITE);
+    //DrawTextureRec(*spr->texture, rec, pos, WHITE);
+    Rectangle dest = {
+        .x = pos.x - spr->anchor.x,
+        .y = pos.y - spr->anchor.y,
+        .width = spr->frame_size.x,
+        .height = spr->frame_size.y
+    };
+    DrawTexturePro(
+        *spr->texture,
+        rec,
+        dest,
+        spr->anchor,
+        rotation, WHITE
+    );
 }

engine/assets.h

@@ -4,6 +4,7 @@
 #include "EC.h"
 #include "raylib.h"
 #include "rres.h"
+#include "particle_sys.h"
 
 typedef struct Assets
 {
@@ -12,6 +13,7 @@ typedef struct Assets
     struct sc_map_s64 m_fonts;
     struct sc_map_s64 m_sprites;
     struct sc_map_s64 m_levelpacks;
+    struct sc_map_s64 m_emitter_confs;
 }Assets_t;
 
 typedef struct LevelTileInfo
@@ -57,14 +59,16 @@ Texture2D* add_texture_rres(Assets_t* assets, const char* name, const char* file
 LevelPack_t* add_level_pack_rres(Assets_t* assets, const char* name, const char* filename, const RresFileInfo_t* rres_file);
 
 Sprite_t* add_sprite(Assets_t* assets, const char* name, Texture2D* texture);
+EmitterConfig_t* add_emitter_conf(Assets_t* assets, const char* name, Sprite_t* sprite);
 
 Texture2D* get_texture(Assets_t* assets, const char* name);
 Sprite_t* get_sprite(Assets_t* assets, const char* name);
+EmitterConfig_t* get_emitter_conf(Assets_t* assets, const char* name);
 Sound* get_sound(Assets_t* assets, const char* name);
 Font* get_font(Assets_t* assets, const char* name);
 LevelPack_t* get_level_pack(Assets_t* assets, const char* name);
 
-void draw_sprite(Sprite_t* spr, Vector2 pos, bool flip_x);
+void draw_sprite(Sprite_t* spr, Vector2 pos, float rotation, bool flip_x);
 
 typedef struct SFX
 {

engine/engine.c

@@ -94,6 +94,7 @@ void init_scene(Scene_t* scene, system_func_t render_func, action_func_t action_
     sc_map_init_64(&scene->action_map, 32, 0);
     sc_array_init(&scene->systems);
     init_entity_manager(&scene->ent_manager);
+    init_particle_system(&scene->part_sys);
 
     //scene->scene_type = scene_type;
     scene->render_function = render_func;
@@ -106,6 +107,7 @@ void free_scene(Scene_t* scene)
     sc_map_term_64(&scene->action_map);
     sc_array_term(&scene->systems);
     free_entity_manager(&scene->ent_manager);
+    deinit_particle_system(&scene->part_sys);
 }
 
 inline void update_scene(Scene_t* scene)
@@ -115,6 +117,7 @@ inline void update_scene(Scene_t* scene)
     {
         sys(scene);
     }
+    update_particle_system(&scene->part_sys);
 }
 
 inline void render_scene(Scene_t* scene)

engine/engine.h

@@ -22,7 +22,6 @@ typedef struct GameEngine {
     unsigned int curr_scene;
     Assets_t assets;
     SFXList_t sfx_list;
-    ParticleSystem_t part_sys;
     // Maintain own queue to handle key presses
     struct sc_queue_32 key_buffer;
 } GameEngine_t;
@@ -50,6 +49,7 @@ struct Scene {
     EntityManager_t ent_manager;
     //SceneType_t scene_type;
     SceneState_t state;
+    ParticleSystem_t part_sys;
     GameEngine_t *engine;
 };
 

engine/engine_conf.h

@@ -9,8 +9,9 @@
 #define MAX_NAME_LEN 32
 #define MAX_LEVEL_PACK 4
 #define N_SFX 18
-#define MAX_PARTICLE_CONF 8
-#define MAX_PARTICLE_EMITTER 16
+#define MAX_EMITTER_CONF 8
+//#define MAX_PARTICLE_EMITTER 8
+#define MAX_ACTIVE_PARTICLE_EMITTER 32
 #define MAX_PARTICLES 10
 
 #define MAX_TILE_TYPES 16

engine/particle_sys.c

@@ -1,4 +1,5 @@
 #include "particle_sys.h"
+#include "assets.h"
 #include <string.h>
 #include <stdlib.h>
 #include <math.h>
@@ -10,14 +11,16 @@ void init_particle_system(ParticleSystem_t* system)
 {
     memset(system, 0, sizeof(ParticleSystem_t));
     sc_queue_init(&system->free_list);
-    for ( uint32_t i = 1; i <= MAX_PARTICLE_EMITTER; ++i)
+    for ( uint32_t i = 1; i <= MAX_ACTIVE_PARTICLE_EMITTER; ++i)
     {
         sc_queue_add_last(&system->free_list, i);
     }
     system->tail_idx = 0;
 }
-void add_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_emitter)
+void play_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_emitter)
 {
+    if (in_emitter == NULL) return;
+
     if (sc_queue_empty(&system->free_list)) return;
     uint32_t idx = sc_queue_del_first(&system->free_list);
     system->emitter_list[system->tail_idx].next = idx;
@@ -33,24 +36,23 @@ void add_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_
     // Generate particles based on type
     for (uint32_t i = 0; i < emitter->n_particles; ++i)
     {
-        uint32_t lifetime = (emitter->config.particle_lifetime[1] - emitter->config.particle_lifetime[0]);
-        emitter->particles[i].timer = emitter->config.particle_lifetime[0];
+        uint32_t lifetime = (emitter->config->particle_lifetime[1] - emitter->config->particle_lifetime[0]);
+        emitter->particles[i].timer = emitter->config->particle_lifetime[0];
         emitter->particles[i].timer += rand() % lifetime;
         emitter->particles[i].alive = true;
 
-        float angle = emitter->config.launch_range[1] - emitter->config.launch_range[0];
+        float angle = emitter->config->launch_range[1] - emitter->config->launch_range[0];
         angle *= (float)rand() / (float)RAND_MAX;
-        angle += emitter->config.launch_range[0];
+        angle += emitter->config->launch_range[0];
         if(angle > 360) angle -= 360;
         if(angle < -360) angle += 360;
-        angle *= PI / 180;
 
-        float speed = emitter->config.speed_range[1] - emitter->config.speed_range[0];
+        float speed = emitter->config->speed_range[1] - emitter->config->speed_range[0];
         speed *= (float)rand() / (float)RAND_MAX;
-        speed += emitter->config.speed_range[0];
+        speed += emitter->config->speed_range[0];
 
-        emitter->particles[i].velocity.x = speed * cos(angle);
-        emitter->particles[i].velocity.y = speed * sin(angle);
+        emitter->particles[i].velocity.x = speed * cos(angle * PI / 180);
+        emitter->particles[i].velocity.y = speed * sin(angle * PI / 180);
         emitter->particles[i].position = emitter->position;
         emitter->particles[i].rotation = angle;
         emitter->particles[i].angular_vel = -10 + 20 * (float)rand() / (float)RAND_MAX;
@@ -72,9 +74,9 @@ void update_particle_system(ParticleSystem_t* system)
         {
             if (emitter->particles[i].alive)
             {
-                if (emitter->config.update_func != NULL)
+                if (emitter->update_func != NULL)
                 {
-                    emitter->config.update_func(emitter->particles + i, emitter->config.user_data);
+                    emitter->update_func(emitter->particles + i, emitter->user_data);
                 }
 
                 // Lifetime update
@@ -119,7 +121,7 @@ void draw_particle_system(ParticleSystem_t* system)
         {
             if (part->alive)
             {
-                if (emitter->tex == NULL || emitter->tex->width == 0)
+                if (emitter->config->spr == NULL)
                 {
                     Rectangle rect = {
                         .x = part->position.x,
@@ -135,21 +137,7 @@ void draw_particle_system(ParticleSystem_t* system)
                 }
                 else
                 {
-                    Rectangle source = {
-                        0.0f, 0.0f,
-                        (float)emitter->tex->width, (float)emitter->tex->height
-                    };
-                    
-                    Rectangle dest = {
-                        part->position.x, part->position.y,
-                        (float)emitter->tex->width, (float)emitter->tex->height
-                    };
-                    Vector2 origin = { (float)emitter->tex->width / 2, (float)emitter->tex->height / 2 };
-                    DrawTexturePro(
-                        *emitter->tex,
-                        source, dest, origin,
-                        part->rotation, WHITE
-                    );
+                    draw_sprite(emitter->config->spr, part->position, part->rotation, false);
                 }
             }
         }

engine/particle_sys.h

@@ -3,6 +3,7 @@
 #include "raylib.h"
 #include "engine_conf.h"
 #include "sc_queue.h"
+#include "EC.h"
 #include <stdint.h>
 #include <stdbool.h>
 
@@ -31,21 +32,21 @@ typedef struct EmitterConfig
     float speed_range[2];
     uint32_t particle_lifetime[2];
     PartEmitterType_t type;
-    void* user_data;
-    particle_update_func_t update_func;
+    Sprite_t* spr;
+    bool one_shot;
 }EmitterConfig_t;
 
 typedef struct ParticleEmitter
 {
-    EmitterConfig_t config;
+    const EmitterConfig_t* config;
     Vector2 position;
     Particle_t particles[MAX_PARTICLES];
     uint32_t n_particles;
-    Texture2D* tex;
     uint32_t timer;
-    bool one_shot;
     bool finished;
     bool active;
+    void* user_data;
+    particle_update_func_t update_func;
 }ParticleEmitter_t;
 
 typedef struct IndexList
@@ -55,8 +56,8 @@ typedef struct IndexList
 
 typedef struct ParticleSystem
 {
-    ParticleEmitter_t emitters[MAX_PARTICLE_EMITTER + 1];
-    IndexList_t emitter_list[MAX_PARTICLE_EMITTER + 1];
+    ParticleEmitter_t emitters[MAX_ACTIVE_PARTICLE_EMITTER + 1];
+    IndexList_t emitter_list[MAX_ACTIVE_PARTICLE_EMITTER + 1];
     struct sc_queue_64 free_list;
     uint32_t tail_idx;
     uint32_t n_configs;
@@ -64,7 +65,7 @@ typedef struct ParticleSystem
 }ParticleSystem_t;
 
 void init_particle_system(ParticleSystem_t* system);
-void add_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_emitter);
+void play_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_emitter);
 void update_particle_system(ParticleSystem_t* system);
 void draw_particle_system(ParticleSystem_t* system);
 void deinit_particle_system(ParticleSystem_t* system);

particle_test.c

@@ -52,19 +52,30 @@ int main(void)
 
     init_particle_system(&part_sys);
     Texture2D tex = LoadTexture("res/bomb.png");
+    Sprite_t spr = {
+        .texture = &tex,
+        .frame_size = (Vector2){tex.width, tex.height},
+        .origin = (Vector2){0, 0},
+        .anchor = (Vector2){tex.width / 2, tex.height / 2},
+        .frame_count = 0,
+        .current_frame = 0,
+        .elapsed = 0,
+        .speed = 0,
+        .name = "test_spr"
+    };
 
     EmitterConfig_t conf ={
+        .one_shot = true,
         .launch_range = {0, 360},
         .speed_range = {400, 2000},
         .particle_lifetime = {30, 110},
-        .update_func = &simple_particle_system_update
+        .spr = (tex.width == 0) ? NULL : &spr,
     };
 
     ParticleEmitter_t emitter = {
-        .config = conf,
+        .config = &conf,
         .n_particles = MAX_PARTICLES,
-        .one_shot = true,
-        .tex = &tex,
+        .update_func = &simple_particle_system_update
     };
 
     bool key_press = false;
@@ -77,7 +88,7 @@ int main(void)
         else if (key_press && IsMouseButtonReleased(MOUSE_BUTTON_LEFT))
         {
             emitter.position = GetMousePosition();
-            add_particle_emitter(&part_sys, &emitter);
+            play_particle_emitter(&part_sys, &emitter);
             key_press = false;
         }
         update_particle_system(&part_sys);

scene_test.c

@@ -14,7 +14,7 @@ static GameEngine_t engine =
     .max_scenes = 1,
     .curr_scene = 0,
     .assets = {0},
-    .sfx_list = {0}
+    .sfx_list = {0},
 };
 
 void update_loop(void)
@@ -35,7 +35,6 @@ int main(void)
     InitAudioDevice();
     init_engine(&engine);
 
-
 #ifndef NDEBUG
     load_from_infofile("res/assets.info.raw", &engine.assets);
     init_player_creation("res/player_spr.info", &engine.assets);
@@ -56,6 +55,7 @@ int main(void)
     load_sfx(&engine, "snd_bland", BOULDER_LAND_SFX);
     load_sfx(&engine, "snd_bubble", BUBBLE_SFX);
 
+
     LevelScene_t scene;
     scene.scene.engine = &engine;
     init_sandbox_scene(&scene);
@@ -68,6 +68,15 @@ int main(void)
     scenes[0] = &scene.scene;
     change_scene(&engine, 0);
 
+    EmitterConfig_t* conf = add_emitter_conf(&engine.assets, "pe_wood", get_sprite(&engine.assets, "bomb"));
+    conf->launch_range[0] = 240;
+    conf->launch_range[1] = 300;
+    conf->one_shot = true;
+    conf->speed_range[0] = 200;
+    conf->speed_range[1] = 300;
+    conf->particle_lifetime[0] = 30;
+    conf->particle_lifetime[1] = 110;
+
     #if defined(PLATFORM_WEB)
         puts("Setting emscripten main loop");
         emscripten_set_main_loop(update_loop, 0, 1);

scenes/editor_scene.c

@@ -225,7 +225,7 @@ static void render_editor_game_scene(Scene_t* scene)
                 uint8_t tile_sprite_idx = tilemap.tiles[i].tile_type + tilemap.tiles[i].rotation;
                 if (data->tile_sprites[tile_sprite_idx] != NULL)
                 {
-                    draw_sprite(data->tile_sprites[tile_sprite_idx], (Vector2){x,y}, false);
+                    draw_sprite(data->tile_sprites[tile_sprite_idx], (Vector2){x,y}, 0.0f, false);
                 }
                 else if (tilemap.tiles[i].tile_type == SOLID_TILE)
                 {
@@ -429,7 +429,7 @@ static void render_editor_game_scene(Scene_t* scene)
                 if (spr.sprite != NULL)
                 {
                     Vector2 pos = Vector2Add(p_ct->position, spr.offset);
-                    draw_sprite(spr.sprite, pos, p_cspr->flip_x);
+                    draw_sprite(spr.sprite, pos, 0.0f, p_cspr->flip_x);
                 }
             }
         }
@@ -448,6 +448,9 @@ static void render_editor_game_scene(Scene_t* scene)
             unsigned int y = ((p_runner->current_tile) / tilemap.width) * tilemap.tile_size;
             DrawCircle(x+16, y+16, 8, ColorAlpha(BLUE, 0.6));
         }
+
+        draw_particle_system(&scene->part_sys);
+
         for (int tile_y = min.y; tile_y < max.y; tile_y++)
         {
             for (int tile_x = min.x; tile_x < max.x; tile_x++)

scenes/game_scene.c

@@ -131,7 +131,7 @@ static void render_regular_game_scene(Scene_t* scene)
 
                 if (data->tile_sprites[tilemap.tiles[i].tile_type] != NULL)
                 {
-                    draw_sprite(data->tile_sprites[tilemap.tiles[i].tile_type], (Vector2){x,y}, false);
+                    draw_sprite(data->tile_sprites[tilemap.tiles[i].tile_type], (Vector2){x,y}, 0.0f, false);
                 }
                 else if (tilemap.tiles[i].tile_type == SOLID_TILE)
                 {
@@ -223,7 +223,7 @@ static void render_regular_game_scene(Scene_t* scene)
                 if (spr.sprite != NULL)
                 {
                     Vector2 pos = Vector2Add(p_ct->position, spr.offset);
-                    draw_sprite(spr.sprite, pos, p_cspr->flip_x);
+                    draw_sprite(spr.sprite, pos, 0.0f, p_cspr->flip_x);
                 }
                 continue;
             }
@@ -319,6 +319,7 @@ static void render_regular_game_scene(Scene_t* scene)
             unsigned int y = ((p_runner->current_tile) / tilemap.width) * tilemap.tile_size;
             DrawCircle(x+16, y+16, 8, ColorAlpha(BLUE, 0.6));
         }
+        draw_particle_system(&scene->part_sys);
 
         // Draw Border
         DrawLine(0, 0, 0, tilemap.height * tilemap.tile_size, BLACK);

scenes/game_systems.c

@@ -1,10 +1,13 @@
 #include "game_systems.h"
+#include "particle_sys.h"
 #include "ent_impl.h"
 #include "AABB.h"
 #include "EC.h"
 #include "constants.h"
 #include <stdio.h>
 
+void simple_particle_system_update(Particle_t* part, void* user_data);
+
 static const Vector2 GRAVITY = {0, GRAV_ACCEL};
 static const Vector2 UPTHRUST = {0, -GRAV_ACCEL * 1.1};
 typedef enum AnchorPoint {
@@ -1627,6 +1630,19 @@ void container_destroy_system(Scene_t* scene)
         Entity_t* p_ent =  get_entity(&scene->ent_manager, ent_idx);
         if (!p_ent->m_alive)
         {
+            if (p_ent->m_tag == CRATES_ENT_TAG)
+            {
+                const CTransform_t* p_ctransform = get_component(p_ent, CTRANSFORM_COMP_T);
+                //const CBBox_t* p_bbox = get_component(p_ent, CBBOX_COMP_T);
+                ParticleEmitter_t emitter = {
+                    .config = get_emitter_conf(&scene->engine->assets, "pe_wood"),
+                    .position = p_ctransform->position,
+                    .n_particles = 3,
+                    .user_data = &(CONTAINER_OF(scene, LevelScene_t, scene)->data),
+                    .update_func = &simple_particle_system_update,
+                };
+                play_particle_emitter(&scene->part_sys, &emitter);
+            }
 
             Entity_t* dmg_src = NULL;
             CHurtbox_t* p_hurtbox = get_component(p_ent, CHURTBOX_T);
@@ -1927,3 +1943,45 @@ void level_end_detection_system(Scene_t* scene)
 
     }
 }
+
+void simple_particle_system_update(Particle_t* part, void* user_data)
+{
+    LevelSceneData_t* lvl_data = (LevelSceneData_t*)user_data;
+    TileGrid_t tilemap = lvl_data->tilemap;
+
+    float delta_time = DELTA_T; // TODO: Will need to think about delta time handling
+    part->velocity =
+        Vector2Add(
+            part->velocity,
+            Vector2Scale(GRAVITY, delta_time)
+        );
+
+    float mag = Vector2Length(part->velocity);
+    part->velocity = Vector2Scale(
+        Vector2Normalize(part->velocity),
+        (mag > PLAYER_MAX_SPEED)? PLAYER_MAX_SPEED:mag
+    );
+    // 3 dp precision
+    if (fabs(part->velocity.x) < 1e-3) part->velocity.x = 0;
+    if (fabs(part->velocity.y) < 1e-3) part->velocity.y = 0;
+
+    part->position = Vector2Add(
+        part->position,
+        Vector2Scale(part->velocity, delta_time)
+    );
+
+    // Level boundary collision
+    unsigned int level_width = tilemap.width * TILE_SIZE;
+    unsigned int level_height = tilemap.height * TILE_SIZE;
+    {
+
+        if(
+            part->position.x < 0 || part->position.x + part->size > level_width
+            || part->position.y < 0 || part->position.y + part->size > level_height
+        )
+        {
+            part->timer = 0;
+        }
+    }
+}
+

scenes/items_ent.c

@@ -2,7 +2,7 @@
 #include "constants.h"
 #include "raymath.h"
 
-static SpriteRenderInfo_t item_sprite_map[18] = {0};
+static SpriteRenderInfo_t item_sprite_map[19] = {0};
 
 bool init_item_creation(Assets_t* assets)
 {
@@ -27,6 +27,7 @@ bool init_item_creation(Assets_t* assets)
     item_sprite_map[16].sprite = get_sprite(assets, "m_b_crate");
     item_sprite_map[17].sprite = get_sprite(assets, "explode");
     item_sprite_map[17].offset = (Vector2){-12, -12};
+    item_sprite_map[18].sprite = get_sprite(assets, "chest");
     return true;
 }
 
@@ -223,6 +224,11 @@ Entity_t* create_chest(EntityManager_t* ent_manager, Assets_t* assets)
     p_hurtbox->def = 4;
     p_hurtbox->damage_src = -1;
 
+    CSprite_t* p_cspr = add_component(p_chest, CSPRITE_T);
+    p_cspr->sprites = item_sprite_map;
+    p_cspr->current_idx = 18;
+
+
     return p_chest;
 }
 

water_test.c

@@ -109,7 +109,7 @@ static void level_scene_render_func(Scene_t* scene)
                 if (spr.sprite != NULL)
                 {
                     Vector2 pos = Vector2Add(p_ct->position, spr.offset);
-                    draw_sprite(spr.sprite, pos, p_cspr->flip_x);
+                    draw_sprite(spr.sprite, pos, 0.0f, p_cspr->flip_x);
                 }
             }
         }