texture alpha/color mods

core.mod/src/entities/EntItemStack.cc

@@ -17,7 +17,11 @@ EntItemStack::EntItemStack(const Swan::Context &ctx, const Swan::SRF &params):
 
 void EntItemStack::draw(const Swan::Context &ctx, Swan::Win &win) {
 	SDL_Rect rect = item_->image_.frameRect();
-	win.showTexture(body_.pos_, item_->image_.texture_.get(), &rect,
+
+	SDL_Texture *tex = item_->image_.texture_.get();
+	Swan::TexColorMod darken(tex, 220, 220, 220);
+
+	win.showTexture(body_.pos_, tex, &rect,
 		{ .hscale = 0.5, .vscale = 0.5 });
 }
 

libswan/include/swan/gfxutil.h

@@ -28,4 +28,42 @@ private:
 	RaiiPtr<SDL_Surface> surf_ = makeRaiiPtr<SDL_Surface>(nullptr, SDL_FreeSurface);
 };
 
+class TexColorMod {
+public:
+	TexColorMod(const TexColorMod &) = delete;
+	TexColorMod(TexColorMod &&) = delete;
+
+	TexColorMod(SDL_Texture *tex, uint8_t r, uint8_t g, uint8_t b): tex_(tex) {
+		SDL_GetTextureColorMod(tex_, &r_, &g_, &b_);
+		SDL_SetTextureColorMod(tex_, r, g, b);
+	}
+
+	~TexColorMod() {
+		SDL_SetTextureColorMod(tex_, r_, g_, b_);
+	}
+
+private:
+	SDL_Texture *tex_;
+	uint8_t r_, g_, b_;
+};
+
+class TexAlphaMod {
+public:
+	TexAlphaMod(const TexAlphaMod &) = delete;
+	TexAlphaMod(TexAlphaMod &&) = delete;
+
+	TexAlphaMod(SDL_Texture *tex, uint8_t alpha): tex_(tex) {
+		SDL_GetTextureAlphaMod(tex_, &alpha_);
+		SDL_SetTextureAlphaMod(tex_, alpha);
+	}
+
+	~TexAlphaMod() {
+		SDL_SetTextureAlphaMod(tex_, alpha_);
+	}
+
+private:
+	SDL_Texture *tex_;
+	uint8_t alpha_;
+};
+
 }