Texture binding manager

texture.cc

@@ -283,3 +283,49 @@ void T_TextureBinding::bind( ) const
 	glUniform1i( uniform_ , binding_ );
 	assert( glGetError( ) == GL_NO_ERROR );
 }
+
+
+/*============================================================================*/
+
+constexpr uint32_t T_TextureManagement::MaxUnits;
+
+void T_TextureManagement::bind(
+		__rd__ const uint32_t unit ,
+		__rd__ T_Texture const& texture )
+{
+	assert( unit < MaxUnits );
+	auto& u( bindings_[ unit ] );
+	if ( u.texture == &texture && !u.sampler ) {
+		return;
+	}
+	u.texture = &texture;
+	u.sampler = nullptr;
+	u.update = true;
+}
+
+void T_TextureManagement::bind(
+		__rd__ const uint32_t unit ,
+		__rd__ T_Texture& texture ,
+		__rd__ T_TextureSampler& sampler )
+{
+	assert( unit < MaxUnits );
+	auto& u( bindings_[ unit ] );
+	if ( u.texture == &texture && u.sampler == &sampler ) {
+		return;
+	}
+	u.texture = &texture;
+	u.sampler = &sampler;
+	u.update = true;
+}
+
+void T_TextureManagement::update( )
+{
+	for ( auto i = 0u ; i < MaxUnits ; i ++ ) {
+		auto& u( bindings_[ i ] );
+		if ( u.update ) {
+			glBindTextureUnit( i , u.texture ? u.texture->id( ) : 0 );
+			glBindSampler( i , u.sampler ? u.sampler->id( ) : 0 );
+			u.update = false;
+		}
+	}
+}

texture.hh

@@ -87,6 +87,9 @@ struct T_TextureSampler
 	// --------------------------------------------------------------------
 	// Usage
 
+	GLuint id( ) const noexcept { return id_; }
+
+	// unused
 	void bind( __rd__ const GLuint unit )
 		{ glBindSampler( unit , id_ ); }
 
@@ -120,3 +123,30 @@ struct T_TextureBinding
 	uint32_t uniform_;
 	T_Texture const* texture_;
 };
+
+
+struct T_TextureManagement
+{
+	static constexpr uint32_t MaxUnits = 8;
+
+	T_TextureManagement( T_TextureManagement const& ) = delete;
+	T_TextureManagement( T_TextureManagement&& ) = delete;
+
+	void bind( __rd__ const uint32_t unit ,
+			__rd__ T_Texture const& texture );
+	void bind( __rd__ const uint32_t unit ,
+			__rd__ T_Texture& texture ,
+			__rd__ T_TextureSampler& sampler );
+
+	void update( );
+
+    private:
+	struct T_Binding_
+	{
+		T_Texture const* texture = nullptr;
+		T_TextureSampler const* sampler = nullptr;
+		bool update = false;
+	};
+
+	T_Binding_ bindings_[ MaxUnits ];
+};