From 20646758939562c0fbad4d52774efcfacf7e22fc Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 22 Dec 2021 14:10:34 +0000
Subject: RAII for glVertex and glBuffer

---
 lib/glBuffers.cpp      | 13 +++++++++++++
 lib/glBuffers.h        | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 lib/glVertexArrays.cpp | 13 +++++++++++++
 lib/glVertexArrays.h   | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 122 insertions(+)
 create mode 100644 lib/glBuffers.cpp
 create mode 100644 lib/glBuffers.h
 create mode 100644 lib/glVertexArrays.cpp
 create mode 100644 lib/glVertexArrays.h

(limited to 'lib')

diff --git a/lib/glBuffers.cpp b/lib/glBuffers.cpp
new file mode 100644
index 0000000..cb5ab2a
--- /dev/null
+++ b/lib/glBuffers.cpp
@@ -0,0 +1,13 @@
+#include "glBuffers.h"
+
+void
+glBuffersBase::gen(GLsizei n, GLuint * ids)
+{
+	glGenBuffers(n, ids);
+}
+
+void
+glBuffersBase::del(GLsizei n, const GLuint * ids)
+{
+	glDeleteBuffers(n, ids);
+}
diff --git a/lib/glBuffers.h b/lib/glBuffers.h
new file mode 100644
index 0000000..e91293c
--- /dev/null
+++ b/lib/glBuffers.h
@@ -0,0 +1,48 @@
+#ifndef GLBUFFERS_H
+#define GLBUFFERS_H
+
+#include <GL/glew.h>
+#include <array>
+#include <cstddef>
+#include <special_members.hpp>
+
+class glBuffersBase {
+protected:
+	static void gen(GLsizei, GLuint *);
+	static void del(GLsizei, const GLuint *);
+};
+
+template<size_t N> class glBuffers : glBuffersBase {
+public:
+	glBuffers()
+	{
+		gen(N, ids.data());
+	}
+
+	~glBuffers()
+	{
+		del(N, ids.data());
+	}
+
+	NO_COPY(glBuffers);
+	NO_MOVE(glBuffers);
+
+	// NOLINTNEXTLINE(hicpp-explicit-conversions)
+	operator GLuint() const
+	{
+		static_assert(N == 1, "Implicit cast only if N == 1");
+		return ids.front();
+	}
+
+	auto
+	operator[](size_t n) const
+	{
+		return ids[n];
+	}
+
+private:
+	std::array<GLuint, N> ids {};
+};
+using glBuffer = glBuffers<1>;
+
+#endif
diff --git a/lib/glVertexArrays.cpp b/lib/glVertexArrays.cpp
new file mode 100644
index 0000000..372b49b
--- /dev/null
+++ b/lib/glVertexArrays.cpp
@@ -0,0 +1,13 @@
+#include "glVertexArrays.h"
+
+void
+glVertexArraysBase::gen(GLsizei n, GLuint * ids)
+{
+	glGenVertexArrays(n, ids);
+}
+
+void
+glVertexArraysBase::del(GLsizei n, const GLuint * ids)
+{
+	glDeleteVertexArrays(n, ids);
+}
diff --git a/lib/glVertexArrays.h b/lib/glVertexArrays.h
new file mode 100644
index 0000000..ab31751
--- /dev/null
+++ b/lib/glVertexArrays.h
@@ -0,0 +1,48 @@
+#ifndef GLVERTEXARRAYS_H
+#define GLVERTEXARRAYS_H
+
+#include <GL/glew.h>
+#include <array>
+#include <cstddef>
+#include <special_members.hpp>
+
+class glVertexArraysBase {
+protected:
+	static void gen(GLsizei, GLuint *);
+	static void del(GLsizei, const GLuint *);
+};
+
+template<size_t N> class glVertexArrays : glVertexArraysBase {
+public:
+	glVertexArrays()
+	{
+		gen(N, ids.data());
+	}
+
+	~glVertexArrays()
+	{
+		del(N, ids.data());
+	}
+
+	NO_COPY(glVertexArrays);
+	NO_MOVE(glVertexArrays);
+
+	// NOLINTNEXTLINE(hicpp-explicit-conversions)
+	operator GLuint() const
+	{
+		static_assert(N == 1, "Implicit cast only if N == 1");
+		return ids.front();
+	}
+
+	auto
+	operator[](size_t n) const
+	{
+		return ids[n];
+	}
+
+private:
+	std::array<GLuint, N> ids {};
+};
+using glVertexArray = glVertexArrays<1>;
+
+#endif
-- 
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