ensure that two objects using hte same texture share it

fggl/gfx/ogl4/meshes.cpp

@@ -201,6 +201,11 @@ namespace fggl::gfx::ogl4 {
 	static ogl::Texture* upload_texture( std::string name, assets::AssetManager* manager ) {
 		debug::info("loading texture: {}", name);
 
+		auto* texture = manager->get<ogl::Texture>("ogl_"+name);
+		if ( texture != nullptr ) {
+			return texture;
+		}
+
 		auto textureData = manager->get<data::Texture2D>(name);
 		ogl::Image image{
 			.type = ogl::PixelFormat::UNSIGNED_BYTE,
@@ -209,9 +214,10 @@ namespace fggl::gfx::ogl4 {
 			.data = textureData->data,
 		};
 
-		ogl::Texture* texture = new ogl::Texture(ogl::TextureType::Tex2D);
+		texture = new ogl::Texture(ogl::TextureType::Tex2D);
 		texture->setData( ogl::InternalImageFormat::RedGreenBlue, image);
-		return texture;
+
+		return manager->set("ogl_"+name, texture);
 	}
 
 	static Material* upload_material( std::string name, assets::AssetManager* manager ) {