From 5a0ecd5c4f0d286926cc333d3c30d5e2df07c883 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 2 Jan 2023 15:05:21 +0000
Subject: Add a traits struct to lookup sizes/type enums for passing to OpenGL

---
 lib/gl_traits.hpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 lib/gl_traits.hpp

diff --git a/lib/gl_traits.hpp b/lib/gl_traits.hpp
new file mode 100644
index 0000000..b50ec50
--- /dev/null
+++ b/lib/gl_traits.hpp
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <GL/glew.h>
+#include <array>
+#include <glm/common.hpp>
+
+template<typename T> struct gl_traits;
+template<> struct gl_traits<float> {
+	static constexpr GLenum type {GL_FLOAT};
+	static constexpr GLint size {1};
+};
+
+template<typename T, std::size_t S> struct gl_traits<std::array<T, S>> : public gl_traits<T> {
+	static constexpr GLint size {S * gl_traits<T>::size};
+};
+
+template<glm::length_t L, typename T, glm::qualifier Q> struct gl_traits<glm::vec<L, T, Q>> : public gl_traits<T> {
+	static constexpr GLint size {L};
+};
+
+template<glm::length_t C, glm::length_t R, typename T, glm::qualifier Q>
+struct gl_traits<glm::mat<C, R, T, Q>> : public gl_traits<T> {
+	static constexpr GLint size {C * R};
+};
-- 
cgit v1.2.3