From 58e2d0143522460904614eb7c49bfbf2363bafb4 Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Thu, 24 Nov 2016 14:46:12 +0100
Subject: [PATCH] clarify doc
---
pixelgl/vertex.go | 2 ++
1 file changed, 2 insertions(+)
diff --git a/pixelgl/vertex.go b/pixelgl/vertex.go
index 9ad6156..1f93a49 100644
--- a/pixelgl/vertex.go
+++ b/pixelgl/vertex.go
@@ -183,6 +183,8 @@ func (va *VertexArray) Draw() {
// UpdateData overwrites the current vertex array data starting at the index offset.
//
// Offset is not a number of bytes, instead, it's an index in the array.
+//
+// If offset is negative or offset+len(data)>len(originaldata) the program panics.
func (va *VertexArray) UpdateData(offset int, data []float64) {
DoNoBlock(func() {
gl.BindBuffer(gl.ARRAY_BUFFER, va.vbo)
--
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