Refactor particle system

Changelog:
- Config should contain constants that determine the spawning of an
  emitter.
- Move user_data and update_func to emitter, since these values can
  change depending on the scene.
- Assets now load in Emitter Configs

engine/assets.c

@@ -36,18 +36,18 @@ typedef struct LevelPackData
     LevelPack_t pack;
     char name[MAX_NAME_LEN];
 }LevelPackData_t;
-typedef struct PartEmitterData
+typedef struct EmitterConfData
 {
-    ParticleEmitter_t emitter;
+    EmitterConfig_t conf;
     char name[MAX_NAME_LEN];
-}ParticleEmitterData_t;
+}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 ParticleEmitterData_t emitters[MAX_PARTICLE_EMITTER];
+static EmitterConfData_t emitter_confs[MAX_EMITTER_CONF];
 
 #define DECOMPRESSOR_INBUF_LEN 4096
 #define DECOMPRESSOR_OUTBUF_LEN 4096
@@ -142,16 +142,16 @@ Font* add_font(Assets_t* assets, const char* name, const char* path)
     return &fonts[fnt_idx].font;
 }
 
-ParticleEmitter_t* add_part_emitter(Assets_t* assets, const char* name, Sprite_t* sprite)
+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_PARTICLE_EMITTER);
-    memset(emitters + emitter_idx, 0, sizeof(ParticleEmitterData_t));
-    emitters[emitter_idx].emitter.spr = sprite;
-    strncpy(emitters[emitter_idx].name, name, MAX_NAME_LEN);
-    sc_map_put_s64(&assets->m_emitters, emitters[emitter_idx].name, emitter_idx);
+    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 &emitters[emitter_idx].emitter;
+    return &emitter_confs[emitter_idx].conf;
 }
 
 LevelPack_t* add_level_pack(Assets_t* assets, const char* name, const char* path)
@@ -357,7 +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_emitters, MAX_PARTICLE_EMITTER, 0);
+    sc_map_init_s64(&assets->m_emitter_confs, MAX_EMITTER_CONF, 0);
     level_decompressor.ctx = ZSTD_createDCtx();
 }
 
@@ -385,7 +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_emitters);
+    sc_map_clear_s64(&assets->m_emitter_confs);
     memset(n_loaded, 0, sizeof(n_loaded));
 }
 
@@ -397,7 +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_emitters);
+    sc_map_term_s64(&assets->m_emitter_confs);
     ZSTD_freeDCtx(level_decompressor.ctx);
 }
 
@@ -421,12 +421,12 @@ Sprite_t* get_sprite(Assets_t* assets, const char* name)
     return NULL;
 }
 
-ParticleEmitter_t* get_emitter(Assets_t* assets, const char* name)
+EmitterConfig_t* get_emitter_conf(Assets_t* assets, const char* name)
 {
-    uint8_t emitter_idx = sc_map_get_s64(&assets->m_emitters, name);
-    if (sc_map_found(&assets->m_emitters))
+    uint8_t emitter_idx = sc_map_get_s64(&assets->m_emitter_confs, name);
+    if (sc_map_found(&assets->m_emitter_confs))
     {
-        return &emitters[emitter_idx].emitter;
+        return &emitter_confs[emitter_idx].conf;
     }
     return NULL;
 }

engine/assets.h

@@ -13,7 +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_emitters;
+    struct sc_map_s64 m_emitter_confs;
 }Assets_t;
 
 typedef struct LevelTileInfo
@@ -59,10 +59,11 @@ 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);
-ParticleEmitter_t* add_part_emitter(Assets_t* assets, const char* name, Sprite_t* sprite);
+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);

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->spr->texture == NULL || emitter->spr->texture->width == 0)
+                if (emitter->config->spr == NULL)
                 {
                     Rectangle rect = {
                         .x = part->position.x,
@@ -135,7 +137,7 @@ void draw_particle_system(ParticleSystem_t* system)
                 }
                 else
                 {
-                    draw_sprite(emitter->spr, part->position, part->rotation, false);
+                    draw_sprite(emitter->config->spr, part->position, part->rotation, false);
                 }
             }
         }

engine/particle_sys.h

@@ -3,7 +3,7 @@
 #include "raylib.h"
 #include "engine_conf.h"
 #include "sc_queue.h"
-#include "assets.h"
+#include "EC.h"
 #include <stdint.h>
 #include <stdbool.h>
 
@@ -32,21 +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;
-    Sprite_t* spr;
     uint32_t timer;
-    bool one_shot;
     bool finished;
     bool active;
+    void* user_data;
+    particle_update_func_t update_func;
 }ParticleEmitter_t;
 
 typedef struct IndexList
@@ -56,8 +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;
@@ -65,7 +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

@@ -65,17 +65,17 @@ int main(void)
     };
 
     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,
-        .spr = &spr,
+        .update_func = &simple_particle_system_update
     };
 
     bool key_press = false;
@@ -88,7 +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);