From ad789329d1614dac83a0a2ae18f802cad29d9800 Mon Sep 17 00:00:00 2001
From: En Yi <en.yi@tutanota.com>
Date: Mon, 20 Nov 2023 22:06:58 +0800
Subject: [PATCH] Add emitter component

Also, add funciton to check if emitter handle is still alive
---
 engine/EC.h           | 8 ++++++++
 engine/engine_conf.h  | 2 +-
 engine/mempool.c      | 2 ++
 engine/particle_sys.c | 7 +++++++
 engine/particle_sys.h | 3 +--
 5 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/engine/EC.h b/engine/EC.h
index 8de97b7..2ae79ea 100644
--- a/engine/EC.h
+++ b/engine/EC.h
@@ -26,6 +26,7 @@ typedef enum ComponentEnum {
     CLIFETIMER_T,
     CWATERRUNNER_T,
     CAIRTIMER_T,
+    CEMITTER_T,
 } ComponentEnum_t;
 
 typedef enum MovementMode {
@@ -215,6 +216,13 @@ typedef struct _CMoveable_t {
     bool gridmove;
 } CMoveable_t;
 
+typedef uint16_t EmitterHandle;
+typedef struct _CEmitter_t
+{
+    EmitterHandle handle;
+    Vector2 offset;
+} CEmitter_t;
+
 static inline void set_bbox(CBBox_t* p_bbox, unsigned int x, unsigned int y)
 {
     p_bbox->size.x = x;
diff --git a/engine/engine_conf.h b/engine/engine_conf.h
index 15baff0..e141a6e 100644
--- a/engine/engine_conf.h
+++ b/engine/engine_conf.h
@@ -17,6 +17,6 @@
 #define MAX_TILE_TYPES 16
 
 #define N_TAGS 10
-#define N_COMPONENTS 14
+#define N_COMPONENTS 15
 #define MAX_COMP_POOL_SIZE 1024
 #endif // _ENGINE_CONF_H
diff --git a/engine/mempool.c b/engine/mempool.c
index 3cd1d99..51190e3 100644
--- a/engine/mempool.c
+++ b/engine/mempool.c
@@ -77,6 +77,7 @@ static CMoveable_t cmoveable_buffer[MAX_COMP_POOL_SIZE];
 static CLifeTimer_t clifetimer_buffer[MAX_COMP_POOL_SIZE];
 static CWaterRunner_t cwaterrunner_buffer[32];
 static CAirTimer_t cairtimer_buffer[8]; // Only player is expected to have this
+static CEmitter_t cemitter_buffer[MAX_COMP_POOL_SIZE]; // Only player is expected to have this
 
 // Static allocate mempools
 static MemPool_t comp_mempools[N_COMPONENTS] = {
@@ -94,6 +95,7 @@ static MemPool_t comp_mempools[N_COMPONENTS] = {
     {clifetimer_buffer, MAX_COMP_POOL_SIZE, sizeof(CLifeTimer_t), NULL, {0}},
     {cwaterrunner_buffer, 32, sizeof(CWaterRunner_t), NULL, {0}},
     {cairtimer_buffer, 8, sizeof(CAirTimer_t), NULL, {0}},
+    {cemitter_buffer, MAX_COMP_POOL_SIZE, sizeof(CEmitter_t), NULL, {0}},
 };
 static MemPool_t ent_mempool = {
     .buffer = entity_buffer,
diff --git a/engine/particle_sys.c b/engine/particle_sys.c
index b231cc0..1ddc141 100644
--- a/engine/particle_sys.c
+++ b/engine/particle_sys.c
@@ -126,6 +126,13 @@ void unload_emitter_handle(ParticleSystem_t* system, EmitterHandle handle)
     system->emitters[handle].finished = true;
 }
 
+bool is_emitter_handle_alive(ParticleSystem_t* system, EmitterHandle handle)
+{
+    if (handle == 0) return false;
+
+    return system->emitters[handle].active;
+}
+
 EmitterHandle play_particle_emitter(ParticleSystem_t* system, const ParticleEmitter_t* in_emitter)
 {
     EmitterHandle idx = load_in_particle_emitter(system, in_emitter);
diff --git a/engine/particle_sys.h b/engine/particle_sys.h
index f8b36e4..9d5dc04 100644
--- a/engine/particle_sys.h
+++ b/engine/particle_sys.h
@@ -7,8 +7,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-typedef uint16_t EmitterHandle;
-
 typedef enum PartEmitterType
 {
     EMITTER_UNKNOWN = 0,
@@ -86,6 +84,7 @@ void play_emitter_handle(ParticleSystem_t* system, EmitterHandle handle);
 void stop_emitter_handle(ParticleSystem_t* system, EmitterHandle handle);
 void update_emitter_handle_position(ParticleSystem_t* system, EmitterHandle handle, Vector2 pos);
 void unload_emitter_handle(ParticleSystem_t* system, EmitterHandle handle);
+bool is_emitter_handle_alive(ParticleSystem_t* system, EmitterHandle handle);
 
 void update_particle_system(ParticleSystem_t* system);
 void draw_particle_system(ParticleSystem_t* system);