Adds more checks for vertex and index buffer creations.

This was SVN commit r26502.

source/renderer/ShadowMap.cpp

@@ -575,6 +575,7 @@ void ShadowMap::BeginRender()
 
 	{
 		PROFILE("bind framebuffer");
+		ENSURE(m->Framebuffer);
 		deviceCommandContext->SetFramebuffer(m->Framebuffer.get());
 	}
 

source/renderer/TexturedLineRData.cpp

@@ -304,7 +304,11 @@ void CTexturedLineRData::Update(const SOverlayTexturedLine& line)
 		indices.insert(indices.end(), capIndices.begin(), capIndices.end());
 	}
 
-	ENSURE(indices.size() % 3 == 0); // GL_TRIANGLES indices, so must be multiple of 3
+	if (vertices.empty() || indices.empty())
+		return;
+
+	// Indices for triangles, so must be multiple of 3.
+	ENSURE(indices.size() % 3 == 0);
 
 	m_BoundingBox = CBoundingBoxAligned();
 	for (const SVertex& vertex : vertices)

source/renderer/VertexBuffer.cpp

@@ -216,6 +216,7 @@ void CVertexBuffer::UpdateChunkVertices(VBChunk* chunk, void* data)
 	}
 	else
 	{
+		ENSURE(data);
 		g_Renderer.GetDeviceCommandContext()->UploadBufferRegion(
 			m_Buffer.get(), data, chunk->m_Index * m_VertexSize, chunk->m_Count * m_VertexSize);
 	}

source/renderer/VertexBufferManager.cpp

@@ -79,6 +79,9 @@ CVertexBufferManager::Handle CVertexBufferManager::AllocateChunk(
 	const Renderer::Backend::GL::CBuffer::Type type,
 	const bool dynamic, void* backingStore, Group group)
 {
+	ENSURE(vertexSize > 0);
+	ENSURE(numberOfVertices > 0);
+
 	CVertexBuffer::VBChunk* result = nullptr;
 
 	if (CVertexBuffer::UseStreaming(dynamic))