Sprite accepts alpha mod parameter; duplicate texture method

src/Sprite.cpp

@@ -194,6 +194,7 @@ void Sprite::update()
         {
             SDL_Texture* texture = frames[frame_ii];
             SDL_Renderer* renderer = get_root()->renderer;
+            SDL_SetTextureAlphaMod(texture, alpha_mod);
             SDL_SetRenderTarget(renderer, NULL);
             SDL_RenderCopyF(renderer, texture, NULL, box.get_rect());
         }

src/Sprite.hpp

@@ -25,6 +25,7 @@ struct Sprite : Node
     Animation blink_animation = Animation(&Sprite::toggle_hidden, this, 500);
     bool is_hidden = false;
     glm::vec2 step = {0, 0};
+    Uint8 alpha_mod = 255;
 
     Sprite(Node*);
     Sprite(Node*, std::string);

src/extension.cpp

@@ -35,6 +35,16 @@ void sfw::fill_texture(SDL_Renderer* renderer, SDL_Texture* texture, SDL_Texture
     }
 }
 
+SDL_Texture* sfw::duplicate_texture(SDL_Renderer* renderer, SDL_Texture* texture)
+{
+    Box box = get_texture_box(texture);
+    SDL_Texture* duplicate = SDL_CreateTexture(
+        renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, box.get_w(), box.get_h());
+    SDL_SetRenderTarget(renderer, duplicate);
+    SDL_RenderCopyF(renderer, texture, NULL, NULL);
+    return duplicate;
+}
+
 std::vector<fs::path> sfw::glob(fs::path query)
 {
     fs::path basename = query.parent_path();

src/extension.hpp

@@ -23,6 +23,7 @@ namespace sfw
     Box get_texture_box(SDL_Texture*);
     void fill_texture(SDL_Renderer*, SDL_Texture*, int, int, int, int = 0xff);
     void fill_texture(SDL_Renderer*, SDL_Texture*, SDL_Texture*);
+    SDL_Texture* duplicate_texture(SDL_Renderer*, SDL_Texture*);
     std::vector<fs::path> glob(fs::path);
     fs::path get_next_file_name(
         fs::path, int = 0, std::string = "", std::string = "");