From c00dacdb573d3e090a092e5725bb3eb7137d0098 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 27 Jan 2024 21:37:59 +0000
Subject: Add traits vertex attrib func override for arrays

Address limitation on size when specifying arrays of glm::vec
---
 lib/gl_traits.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'lib')

diff --git a/lib/gl_traits.h b/lib/gl_traits.h
index 14ac9d8..b3c6909 100644
--- a/lib/gl_traits.h
+++ b/lib/gl_traits.h
@@ -83,6 +83,14 @@ template<> struct gl_traits<glm::uint32> : public gl_traits_integer {
 
 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};
+	static constexpr auto vertexAttribFunc {
+			[](GLuint index, GLint, GLenum type, GLsizei stride, const void * pointer) -> GLuint {
+				const auto base = static_cast<const T *>(pointer);
+				for (GLuint e = 0; e < S; e++) {
+					glVertexAttribPointer(index + e, gl_traits<T>::size, type, GL_FALSE, stride, base + e);
+				}
+				return S;
+			}};
 };
 
 template<glm::length_t L, typename T, glm::qualifier Q> struct gl_traits<glm::vec<L, T, Q>> : public gl_traits<T> {
-- 
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