From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 3 Apr 2021 18:55:58 +0000 (+0300)
Subject: Do an early return from Mesh::draw if there's no data
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=db349c75a9563d38afaf1a8a602d9ee1155d62bb;p=libs%2Fgl.git

Do an early return from Mesh::draw if there's no data

Otherwise if would try to set zero-sized storage for the buffers, which
is not allowed.

Also guard against empty batches in resize_buffers just in case.
---

diff --git a/source/core/mesh.cpp b/source/core/mesh.cpp
index 3a79f3e5..d3fd7360 100644
--- a/source/core/mesh.cpp
+++ b/source/core/mesh.cpp
@@ -155,6 +155,9 @@ void Mesh::draw(Renderer &renderer, const VertexSetup *vs, unsigned count) const
 			return;
 	}
 
+	if(batches.empty())
+		return;
+
 	if(dirty)
 		resize_buffers();
 
@@ -177,7 +180,7 @@ void Mesh::resize_buffers() const
 {
 	if(dirty&VERTEX_BUFFER)
 		vbuf->storage(vertices.get_required_buffer_size());
-	if(dirty&INDEX_BUFFER)
+	if((dirty&INDEX_BUFFER) && !batches.empty())
 		ibuf->storage(batches.front().get_required_buffer_size());
 	dirty = 0;
 }