Fix incorrect usage of s64 map

Changelog:
- Turns out, the map doesnt make a copy of the string for storage.
  Therefore, need to store the name somewhere before inserting into
  the map.
- Add struct for each assets to retain the name.
- Update assets functions to maintain interface

scenes/engine/assets.c

@@ -5,23 +5,50 @@
 #define MAX_SPRITES 16
 #define MAX_SOUNDS 16
 #define MAX_FONTS 4
+#define MAX_NAME_LEN 32
 uint8_t free_idx[4] = {0};
 
 // Hard limit number of 
-static Texture2D textures[MAX_TEXTURES];
-static Font fonts[MAX_FONTS];
-static Sound sfx[MAX_SOUNDS];
-static Sprite_t sprites[MAX_SPRITES];
+typedef struct TextureData
+{
+    Texture2D texture;
+    char name[MAX_NAME_LEN];
+}TextureData_t;
+typedef struct SpriteData
+{
+    Sprite_t sprite;
+    char name[MAX_NAME_LEN];
+}SpriteData_t;
+typedef struct FontData
+{
+    Font font;
+    char name[MAX_NAME_LEN];
+}FontData_t;
+typedef struct SoundData
+{
+    Sound sound;
+    char name[MAX_NAME_LEN];
+}SoundData_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];
 
 // Maybe need a circular buffer??
 Texture2D* add_texture(Assets_t* assets, const char* name, const char* path)
 {
     uint8_t tex_idx = free_idx[0];
     assert(tex_idx < MAX_TEXTURES);
-    textures[tex_idx] = LoadTexture(path);
-    sc_map_put_s64(&assets->m_textures, name, tex_idx);
+    Texture2D tex = LoadTexture(path);
+    if (tex.width == 0 || tex.height == 0) return NULL;
+
+    textures[tex_idx].texture = tex;
+    strncpy(textures[tex_idx].name, name, MAX_NAME_LEN);
+    sc_map_put_s64(&assets->m_textures, textures[tex_idx].name, tex_idx);
     free_idx[0]++;
-    return textures + tex_idx;
+    return &textures[tex_idx].texture;
 }
 
 Sprite_t* add_sprite(Assets_t* assets, const char* name, Texture2D* texture)
@@ -29,30 +56,33 @@ Sprite_t* add_sprite(Assets_t* assets, const char* name, Texture2D* texture)
     uint8_t spr_idx = free_idx[1];
     assert(spr_idx < MAX_SPRITES);
     memset(sprites + spr_idx, 0, sizeof(Sprite_t));
-    sprites[spr_idx].texture = texture;
-    sc_map_put_s64(&assets->m_sprites, name, spr_idx);
+    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);
     free_idx[1]++;
-    return sprites + spr_idx;
+    return &sprites[spr_idx].sprite;
 }
 
 Sound* add_sound(Assets_t* assets, const char* name, const char* path)
 {
     uint8_t snd_idx = free_idx[2];
     assert(snd_idx < MAX_SOUNDS);
-    sfx[snd_idx] = LoadSound(path);
-    sc_map_put_s64(&assets->m_sounds, name, snd_idx);
+    sfx[snd_idx].sound = LoadSound(path);
+    strncpy(sfx[snd_idx].name, name, MAX_NAME_LEN);
+    sc_map_put_s64(&assets->m_sounds, sfx[snd_idx].name, snd_idx);
     free_idx[2]++;
-    return sfx + snd_idx;
+    return &sfx[snd_idx].sound;
 }
 
 Font* add_font(Assets_t* assets, const char* name, const char* path)
 {
     uint8_t fnt_idx = free_idx[3];
     assert(fnt_idx < MAX_FONTS);
-    fonts[fnt_idx] = LoadFont(path);
-    sc_map_put_s64(&assets->m_fonts, name, fnt_idx);
+    fonts[fnt_idx].font = LoadFont(path);
+    strncpy(fonts[fnt_idx].name, name, MAX_NAME_LEN);
+    sc_map_put_s64(&assets->m_fonts, fonts[fnt_idx].name, fnt_idx);
     free_idx[3]++;
-    return fonts + fnt_idx;
+    return &fonts[fnt_idx].font;
 }
 
 void init_assets(Assets_t* assets)
@@ -86,7 +116,7 @@ Texture2D* get_texture(Assets_t* assets, const char* name)
     uint8_t tex_idx = sc_map_get_s64(&assets->m_textures, name);
     if (sc_map_found(&assets->m_textures))
     {
-        return textures + tex_idx;
+        return &textures[tex_idx].texture;
     }
     return NULL;
 }
@@ -96,7 +126,7 @@ Sprite_t* get_sprite(Assets_t* assets, const char* name)
     uint8_t spr_idx = sc_map_get_s64(&assets->m_sprites, name);
     if (sc_map_found(&assets->m_sprites))
     {
-        return sprites + spr_idx;
+        return &sprites[spr_idx].sprite;
     }
     return NULL;
 }
@@ -106,7 +136,7 @@ Sound* get_sound(Assets_t* assets, const char* name)
     uint8_t snd_idx = sc_map_get_s64(&assets->m_sounds, name);
     if (sc_map_found(&assets->m_sounds))
     {
-        return sfx + snd_idx;
+        return &sfx[snd_idx].sound;
     }
     return NULL;
 }
@@ -116,7 +146,7 @@ Font* get_font(Assets_t* assets, const char* name)
     uint8_t fnt_idx = sc_map_get_s64(&assets->m_fonts, name);
     if (sc_map_found(&assets->m_fonts))
     {
-        return fonts + fnt_idx;
+        return &fonts[fnt_idx].font;
     }
     return NULL;
 }