OGL: Ensure VAO is active before unmapping buffers

Fixes a crash which could occur in platforms which do not support
buffer_storage, and EFB2RAM is enabled (which indirectly uses the
attributeless buffer).

1 files changed, 4 insertions, 0 deletions

diff --git a/Source/Core/VideoBackends/OGL/VertexManager.cpp b/Source/Core/VideoBackends/OGL/VertexManager.cpp
index 00b20e3c76..00cf6b3cfa 100644
--- a/Source/Core/VideoBackends/OGL/VertexManager.cpp
+++ b/Source/Core/VideoBackends/OGL/VertexManager.cpp
@@ -86,6 +86,10 @@ void VertexManager::PrepareDrawBuffers(u32 stride)
   u32 vertex_data_size = IndexGenerator::GetNumVerts() * stride;
   u32 index_data_size = IndexGenerator::GetIndexLen() * sizeof(u16);
 
+  // The index buffer is part of the VAO state, therefore we need to bind it first.
+  const GLVertexFormat* vertex_format =
+      static_cast<GLVertexFormat*>(VertexLoaderManager::GetCurrentVertexFormat());
+  ProgramShaderCache::BindVertexFormat(vertex_format);
   s_vertexBuffer->Unmap(vertex_data_size);
   s_indexBuffer->Unmap(index_data_size);