From b0ecc6c056297b77cab0bbdcb626fabd10fbac3f Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 4 Oct 2020 12:23:01 +0300
Subject: [PATCH] Add OpenGL array class

---
 libs/gfx/include/psemek/gfx/array.hpp | 34 +++++++++++++++++
 libs/gfx/source/array.cpp             | 54 +++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 libs/gfx/include/psemek/gfx/array.hpp
 create mode 100644 libs/gfx/source/array.cpp

diff --git a/libs/gfx/include/psemek/gfx/array.hpp b/libs/gfx/include/psemek/gfx/array.hpp
new file mode 100644
index 00000000..e9c45af7
--- /dev/null
+++ b/libs/gfx/include/psemek/gfx/array.hpp
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <psemek/gfx/gl.hpp>
+
+#include <cstddef>
+
+namespace psemek::gfx
+{
+
+	struct array
+	{
+		array();
+		array(array &&);
+		array & operator = (array &&);
+		~array();
+
+		array(array const &) = delete;
+		array & operator = (array const &) = delete;
+
+		static array null();
+
+		GLuint id() const { return id_; }
+
+		void bind() const;
+
+		void reset();
+
+	private:
+		GLuint id_;
+
+		explicit array(std::nullptr_t);
+	};
+
+}
diff --git a/libs/gfx/source/array.cpp b/libs/gfx/source/array.cpp
new file mode 100644
index 00000000..8cd0dba1
--- /dev/null
+++ b/libs/gfx/source/array.cpp
@@ -0,0 +1,54 @@
+#include <psemek/gfx/array.hpp>
+
+#include <utility>
+
+namespace psemek::gfx
+{
+
+	array::array()
+	{
+		gl::GenVertexArrays(1, &id_);
+	}
+
+	array::array(array && other)
+		: id_{other.id_}
+	{
+		other.id_ = 0;
+	}
+
+	array & array::operator = (array && other)
+	{
+		if (this == &other) return *this;
+
+		reset();
+		std::swap(id_, other.id_);
+		return *this;
+	}
+
+	array::~array()
+	{
+		reset();
+	}
+
+	array array::null()
+	{
+		return array(nullptr);
+	}
+
+	void array::bind() const
+	{
+		gl::BindVertexArray(id_);
+	}
+
+	void array::reset()
+	{
+		if (id_ != 0)
+			gl::DeleteVertexArrays(1, &id_);
+		id_ = 0;
+	}
+
+	array::array(std::nullptr_t)
+		: id_{0}
+	{}
+
+}