From c4214a39f4ef941316042d48cabfbd826cc7a07f Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 17 Dec 2013 09:40:17 -0800
Subject: [PATCH] win32: Reset all dispatch tables to re-resolve on any
 wglMakeCurrent.

---
 src/dispatch_common.c |  8 -------
 src/dispatch_common.h |  8 +++++++
 src/dispatch_wgl.c    | 50 +++++++++++++++++++++++++++++++++++++++++++
 src/gen_dispatch.py   |  6 +++++-
 4 files changed, 63 insertions(+), 9 deletions(-)

diff --git a/src/dispatch_common.c b/src/dispatch_common.c
index e597c4e..0ac5d23 100644
--- a/src/dispatch_common.c
+++ b/src/dispatch_common.c
@@ -475,14 +475,6 @@ epoxy_print_failure_reasons(const char *name,
     }
 }
 
-#ifdef _WIN32
-#define WRAPPER_VISIBILITY PUBLIC
-#define WRAPPER(x) x
-#else
-#define WRAPPER_VISIBILITY static
-#define WRAPPER(x) x ## _wrapped
-#endif
-
 WRAPPER_VISIBILITY void
 WRAPPER(epoxy_glBegin)(GLenum primtype)
 {
diff --git a/src/dispatch_common.h b/src/dispatch_common.h
index 5170239..02599bd 100644
--- a/src/dispatch_common.h
+++ b/src/dispatch_common.h
@@ -66,9 +66,13 @@
 #if defined(_WIN32)
 #define USING_DISPATCH_TABLE 1
 #define UNWRAPPED_PROTO(x) x
+#define WRAPPER_VISIBILITY PUBLIC
+#define WRAPPER(x) x
 #else
 #define USING_DISPATCH_TABLE 0
 #define UNWRAPPED_PROTO(x) (*x)
+#define WRAPPER_VISIBILITY static
+#define WRAPPER(x) x ## _wrapped
 #endif
 
 void *epoxy_egl_dlsym(const char *name);
@@ -100,4 +104,8 @@ void gl_init_dispatch_table(void);
 void wgl_init_dispatch_table(void);
 extern uint32_t gl_tls_index, gl_tls_size;
 extern uint32_t wgl_tls_index, wgl_tls_size;
+extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeCurrent_unwrapped)(HDC hdc, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeContextCurrentARB_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeContextCurrentEXT_unwrapped)(HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
+extern BOOL UNWRAPPED_PROTO(epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped)(HGLRC hglrc);
 #endif
diff --git a/src/dispatch_wgl.c b/src/dispatch_wgl.c
index 0161ad4..743136e 100644
--- a/src/dispatch_wgl.c
+++ b/src/dispatch_wgl.c
@@ -117,3 +117,53 @@ DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
 
     return TRUE;
 }
+
+WRAPPER_VISIBILITY BOOL
+WRAPPER(epoxy_wglMakeCurrent)(HDC hdc, HGLRC hglrc)
+{
+    BOOL ret = epoxy_wglMakeCurrent_unwrapped(hdc, hglrc);
+
+    reset_dispatch_table();
+
+    return ret;
+}
+
+
+WRAPPER_VISIBILITY BOOL
+WRAPPER(epoxy_wglMakeContextCurrentARB)(HDC hDrawDC,
+                                        HDC hReadDC,
+                                        HGLRC hglrc)
+{
+    BOOL ret = epoxy_wglMakeContextCurrentARB_unwrapped(hDrawDC, hReadDC,
+                                                        hglrc);
+
+    reset_dispatch_table();
+
+    return ret;
+}
+
+
+WRAPPER_VISIBILITY BOOL
+WRAPPER(epoxy_wglMakeContextCurrentEXT)(HDC hDrawDC,
+                                        HDC hReadDC,
+                                        HGLRC hglrc)
+{
+    BOOL ret = epoxy_wglMakeContextCurrentEXT_unwrapped(hDrawDC, hReadDC,
+                                                        hglrc);
+
+    reset_dispatch_table();
+
+    return ret;
+}
+
+
+WRAPPER_VISIBILITY BOOL
+WRAPPER(epoxy_wglMakeAssociatedContextCurrentAMD)(HGLRC hglrc)
+{
+    BOOL ret = epoxy_wglMakeAssociatedContextCurrentAMD_unwrapped(hglrc);
+
+    reset_dispatch_table();
+
+    return ret;
+}
+
diff --git a/src/gen_dispatch.py b/src/gen_dispatch.py
index ce3f948..7a2d2df 100755
--- a/src/gen_dispatch.py
+++ b/src/gen_dispatch.py
@@ -65,7 +65,11 @@ class GLFunction(object):
         # non-public symbols with a "_unwrapped" suffix.
         wrapped_functions = {
             'glBegin',
-            'glEnd'
+            'glEnd',
+            'wglMakeCurrent',
+            'wglMakeContextCurrentEXT',
+            'wglMakeContextCurrentARB',
+            'wglMakeAssociatedContextCurrentAMD',
         }
 
         if name in wrapped_functions: