From f2a594fad5de59180add789ebebac7ff74f69c32 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Tue, 5 Mar 2019 23:02:40 +1000
Subject: [PATCH] OGL: Fix binding error on shutdown

This was occurring if the imgui vertex format was bound on shutdown,
which is destroyed before the vertex buffers
---
 Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp | 1 +
 Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp | 6 ++++++
 Source/Core/VideoBackends/OGL/ProgramShaderCache.h   | 1 +
 3 files changed, 8 insertions(+)

diff --git a/Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp b/Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp
index 50a6276c72..c95e1f8472 100644
--- a/Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp
+++ b/Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp
@@ -80,6 +80,7 @@ GLVertexFormat::GLVertexFormat(const PortableVertexDeclaration& vtx_decl)
 
 GLVertexFormat::~GLVertexFormat()
 {
+  ProgramShaderCache::InvalidateVertexFormatIfBound(VAO);
   glDeleteVertexArrays(1, &VAO);
 }
 }  // namespace OGL
diff --git a/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp b/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
index 85084979c3..8832c8e6f0 100644
--- a/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
+++ b/Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
@@ -494,6 +494,12 @@ void ProgramShaderCache::InvalidateVertexFormat()
   s_last_VAO = 0;
 }
 
+void ProgramShaderCache::InvalidateVertexFormatIfBound(GLuint vao)
+{
+  if (s_last_VAO == vao)
+    s_last_VAO = 0;
+}
+
 void ProgramShaderCache::InvalidateLastProgram()
 {
   CurrentProgram = 0;
diff --git a/Source/Core/VideoBackends/OGL/ProgramShaderCache.h b/Source/Core/VideoBackends/OGL/ProgramShaderCache.h
index 4aeb40a6c9..bc93445c55 100644
--- a/Source/Core/VideoBackends/OGL/ProgramShaderCache.h
+++ b/Source/Core/VideoBackends/OGL/ProgramShaderCache.h
@@ -72,6 +72,7 @@ public:
   static void BindVertexFormat(const GLVertexFormat* vertex_format);
   static bool IsValidVertexFormatBound();
   static void InvalidateVertexFormat();
+  static void InvalidateVertexFormatIfBound(GLuint vao);
   static void InvalidateLastProgram();
 
   static bool CompileComputeShader(SHADER& shader, const std::string& code);