From 8f84e67b7b9dcd4f5993909aa9ee2e222a207836 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 23 Apr 2023 20:56:49 +0100
Subject: Assert the buffer is actually mapped

Will fail if the context is deleted. We shouldn't trigger that, but we do right now.
---
 gfx/gl/instanceVertices.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gfx/gl/instanceVertices.h b/gfx/gl/instanceVertices.h
index 228020d..8bb2f21 100644
--- a/gfx/gl/instanceVertices.h
+++ b/gfx/gl/instanceVertices.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "glArrays.h"
+#include <cassert>
 #include <iterator>
 #include <span>
 #include <special_members.hpp>
@@ -186,6 +187,7 @@ protected:
 	{
 		if (!data) {
 			data = static_cast<T *>(glMapNamedBuffer(buffer, GL_READ_WRITE));
+			assert(data);
 		}
 	}
 
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