From 5923efbdeebd3c95cdf7df8224820740904e6676 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Thu, 17 Jan 2019 19:13:43 +0100
Subject: [PATCH] external: pass GL::Context to flextGLInit().

To make it possible to put driver-specific workaround there.
---
 src/Magnum/GL/Context.cpp                                | 9 +++++----
 src/Magnum/GL/Context.h                                  | 8 ++++----
 src/MagnumExternal/OpenGL/GL/flextGL.h                   | 3 ++-
 src/MagnumExternal/OpenGL/GL/flextGL.h.template          | 3 ++-
 src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp         | 2 +-
 .../OpenGL/GL/flextGLPlatform.cpp.template               | 2 +-
 .../OpenGL/GLES2/Emscripten/flextGLEmscripten.h.template | 4 +++-
 src/MagnumExternal/OpenGL/GLES2/flextGL.h                | 3 ++-
 src/MagnumExternal/OpenGL/GLES2/flextGL.h.template       | 3 ++-
 src/MagnumExternal/OpenGL/GLES2/flextGLEmscripten.h      | 4 +++-
 src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp      | 2 +-
 .../OpenGL/GLES2/flextGLPlatform.cpp.template            | 2 +-
 src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp   | 2 +-
 .../OpenGL/GLES2/flextGLPlatformIOS.cpp.template         | 2 +-
 .../OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp       | 2 +-
 .../GLES2/flextGLPlatformWindowsDesktop.cpp.template     | 2 +-
 src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h  | 3 ++-
 .../OpenGL/GLES2/flextGLWindowsDesktop.h.template        | 3 ++-
 .../OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template | 4 +++-
 src/MagnumExternal/OpenGL/GLES3/flextGL.h                | 3 ++-
 src/MagnumExternal/OpenGL/GLES3/flextGL.h.template       | 3 ++-
 src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h      | 4 +++-
 src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp      | 2 +-
 .../OpenGL/GLES3/flextGLPlatform.cpp.template            | 2 +-
 src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp   | 2 +-
 .../OpenGL/GLES3/flextGLPlatformIOS.cpp.template         | 2 +-
 .../OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp       | 2 +-
 .../GLES3/flextGLPlatformWindowsDesktop.cpp.template     | 2 +-
 src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h  | 3 ++-
 .../OpenGL/GLES3/flextGLWindowsDesktop.h.template        | 3 ++-
 30 files changed, 55 insertions(+), 36 deletions(-)

diff --git a/src/Magnum/GL/Context.cpp b/src/Magnum/GL/Context.cpp
index ecdb899d2..fe514bb0e 100644
--- a/src/Magnum/GL/Context.cpp
+++ b/src/Magnum/GL/Context.cpp
@@ -449,9 +449,9 @@ Context& Context::current() {
     return *currentContext;
 }
 
-Context::Context(NoCreateT, Int argc, const char** argv, void functionLoader()): Context{NoCreate, Utility::Arguments{"magnum"}, argc, argv, functionLoader} {}
+Context::Context(NoCreateT, Int argc, const char** argv, void functionLoader(Context&)): Context{NoCreate, Utility::Arguments{"magnum"}, argc, argv, functionLoader} {}
 
-Context::Context(NoCreateT, Utility::Arguments& args, Int argc, const char** argv, void functionLoader()): _functionLoader{functionLoader}, _version{Version::None} {
+Context::Context(NoCreateT, Utility::Arguments& args, Int argc, const char** argv, void functionLoader(Context&)): _functionLoader{functionLoader}, _version{Version::None} {
     /* Parse arguments */
     CORRADE_INTERNAL_ASSERT(args.prefix() == "magnum");
     args.addOption("disable-workarounds")
@@ -504,8 +504,9 @@ bool Context::tryCreate() {
     CORRADE_ASSERT(_version == Version::None,
         "Platform::Context::tryCreate(): context already created", false);
 
-    /* Load GL function pointers */
-    if(_functionLoader) _functionLoader();
+    /* Load GL function pointers. Pass this instance to it so it can use it for
+       potential driver-specific workarounds. */
+    if(_functionLoader) _functionLoader(*this);
 
     /* Initialize to something predictable to avoid crashes on improperly
        created contexts */
diff --git a/src/Magnum/GL/Context.h b/src/Magnum/GL/Context.h
index 835063602..51d91d45a 100644
--- a/src/Magnum/GL/Context.h
+++ b/src/Magnum/GL/Context.h
@@ -667,9 +667,9 @@ class MAGNUM_GL_EXPORT Context {
         friend Platform::GLContext;
         #endif
 
-        explicit Context(NoCreateT, Int argc, const char** argv, void functionLoader());
-        explicit Context(NoCreateT, Utility::Arguments&& args, Int argc, const char** argv, void functionLoader()): Context{NoCreate, args, argc, argv, functionLoader} {}
-        explicit Context(NoCreateT, Utility::Arguments& args, Int argc, const char** argv, void functionLoader());
+        explicit Context(NoCreateT, Int argc, const char** argv, void functionLoader(Context&));
+        explicit Context(NoCreateT, Utility::Arguments&& args, Int argc, const char** argv, void functionLoader(Context&)): Context{NoCreate, args, argc, argv, functionLoader} {}
+        explicit Context(NoCreateT, Utility::Arguments& args, Int argc, const char** argv, void functionLoader(Context&));
 
         bool tryCreate();
         void create();
@@ -683,7 +683,7 @@ class MAGNUM_GL_EXPORT Context {
         MAGNUM_GL_LOCAL bool isCoreProfileImplementationNV();
         #endif
 
-        void(*_functionLoader)(){};
+        void(*_functionLoader)(Context&){};
         Version _version;
         #ifndef MAGNUM_TARGET_WEBGL
         Flags _flags;
diff --git a/src/MagnumExternal/OpenGL/GL/flextGL.h b/src/MagnumExternal/OpenGL/GL/flextGL.h
index 129495d07..95c6e3def 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGL.h
+++ b/src/MagnumExternal/OpenGL/GL/flextGL.h
@@ -28,6 +28,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -63,7 +64,7 @@ extern "C" {
 
 #ifndef DOXYGEN_GENERATING_OUTPUT /* So the macro names are preserved in the docs */
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GL/flextGL.h.template b/src/MagnumExternal/OpenGL/GL/flextGL.h.template
index 11a4f6aef..1e0714378 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGL.h.template
+++ b/src/MagnumExternal/OpenGL/GL/flextGL.h.template
@@ -29,6 +29,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -64,7 +65,7 @@ extern "C" {
 
 #ifndef DOXYGEN_GENERATING_OUTPUT /* So the macro names are preserved in the docs */
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp b/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp
index f2a26135d..51a3cfff8 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp
+++ b/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp
@@ -30,7 +30,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context& context) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
 
     /* GL_ARB_ES3_2_compatibility */
diff --git a/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template b/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template
index e41160c14..833b79b9d 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template
+++ b/src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template
@@ -31,7 +31,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context& context) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
     @if funcs and category not in ['VERSION_1_0', 'VERSION_1_1']:
diff --git a/src/MagnumExternal/OpenGL/GLES2/Emscripten/flextGLEmscripten.h.template b/src/MagnumExternal/OpenGL/GLES2/Emscripten/flextGLEmscripten.h.template
index 24ed94af3..0849a6079 100644
--- a/src/MagnumExternal/OpenGL/GLES2/Emscripten/flextGLEmscripten.h.template
+++ b/src/MagnumExternal/OpenGL/GLES2/Emscripten/flextGLEmscripten.h.template
@@ -26,6 +26,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include "Magnum/GL/GL.h"
+
 /* Defensive include guards */
 
 #if defined(__gl2_h_)
@@ -46,7 +48,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 #define APIENTRY
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGL.h b/src/MagnumExternal/OpenGL/GLES2/flextGL.h
index 941290695..f8a72db4a 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGL.h
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGL.h
@@ -28,6 +28,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -50,7 +51,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGL.h.template b/src/MagnumExternal/OpenGL/GLES2/flextGL.h.template
index f0f930d2e..b465c2740 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGL.h.template
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGL.h.template
@@ -29,6 +29,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -51,7 +52,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLEmscripten.h b/src/MagnumExternal/OpenGL/GLES2/flextGLEmscripten.h
index e36424c1b..eb47a02cd 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLEmscripten.h
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLEmscripten.h
@@ -25,6 +25,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include "Magnum/GL/GL.h"
+
 /* Defensive include guards */
 
 #if defined(__gl2_h_)
@@ -45,7 +47,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 #define APIENTRY
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp
index 68fd0a9ca..ac687633c 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp
@@ -30,7 +30,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
 
     /* GL_ANGLE_framebuffer_blit */
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp.template b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp.template
index 5c1f803c4..303ee8fa0 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatform.cpp.template
@@ -31,7 +31,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
     @if funcs and category not in ['ES_VERSION_2_0']:
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp
index 393d1d6bc..cbf4819ed 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp
@@ -152,7 +152,7 @@
 
 #include <OpenGLES/ES2/glext.h>
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     /* Work around missing glTexStorage3D (can't be used anyway because GLES2
        on iOS doesn't support OES_texture_3D) */
     constexpr void(*glTexStorage3DEXT)() = nullptr;
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp.template b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp.template
index ffc30a155..9f2cc4f04 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformIOS.cpp.template
@@ -36,7 +36,7 @@
 
 #include <OpenGLES/ES2/glext.h>
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     /* Work around missing glTexStorage3D (can't be used anyway because GLES2
        on iOS doesn't support OES_texture_3D) */
     constexpr void(*glTexStorage3DEXT)() = nullptr;
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp
index db1200230..c86977630 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp
@@ -30,7 +30,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
 
     /* GL_ANGLE_framebuffer_blit */
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp.template b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp.template
index 5261f4f66..8b7d062e1 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLPlatformWindowsDesktop.cpp.template
@@ -31,7 +31,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
     @if funcs:
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h b/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h
index 0acbdf19f..0dcb0a915 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h
@@ -28,6 +28,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -50,7 +51,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h.template b/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h.template
index e95c7c92e..7f5fc9683 100644
--- a/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h.template
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGLWindowsDesktop.h.template
@@ -29,6 +29,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -51,7 +52,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template b/src/MagnumExternal/OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template
index 4481b451a..fbf2a7d73 100644
--- a/src/MagnumExternal/OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template
+++ b/src/MagnumExternal/OpenGL/GLES3/Emscripten/flextGLEmscripten.h.template
@@ -26,6 +26,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include "Magnum/GL/GL.h"
+
 /* Defensive include guards */
 
 #if defined(__gl_h_) || defined(__gl2_h_) || defined(__gl3_h_) || defined(__gl31_h_)
@@ -51,7 +53,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 #define APIENTRY
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGL.h b/src/MagnumExternal/OpenGL/GLES3/flextGL.h
index 8738b9654..c83e6ba00 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGL.h
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGL.h
@@ -28,6 +28,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -54,7 +55,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGL.h.template b/src/MagnumExternal/OpenGL/GLES3/flextGL.h.template
index 670f9b0a6..9b58f8fd0 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGL.h.template
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGL.h.template
@@ -29,6 +29,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -55,7 +56,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h b/src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h
index 42a7cae5e..77fc47a79 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLEmscripten.h
@@ -25,6 +25,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include "Magnum/GL/GL.h"
+
 /* Defensive include guards */
 
 #if defined(__gl_h_) || defined(__gl2_h_) || defined(__gl3_h_) || defined(__gl31_h_)
@@ -50,7 +52,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 #define APIENTRY
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp
index 405cb0599..777e467dc 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp
@@ -30,7 +30,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
 
     /* GL_ES_VERSION_3_1 */
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp.template b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp.template
index f45a016c9..518eeed6b 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp.template
@@ -31,7 +31,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
     @if funcs and category not in ['ES_VERSION_2_0', 'ES_VERSION_3_0']:
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp
index b3fd89f95..b768ddf4c 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp
@@ -253,7 +253,7 @@
 
 #include <OpenGLES/ES3/glext.h>
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
 
     /* GL_ES_VERSION_3_1 */
     #if GL_ES_VERSION_3_1
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp.template b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp.template
index b9ba20a70..50506f388 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp.template
@@ -36,7 +36,7 @@
 
 #include <OpenGLES/ES3/glext.h>
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     @for category,funcs in functions:
     @if funcs and category not in ['ES_VERSION_2_0', 'ES_VERSION_3_0']:
 
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp
index 1422c1dd9..4fc15b9e1 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp
@@ -30,7 +30,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
 
     /* GL_ES_VERSION_2_0 */
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp.template b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp.template
index 5261f4f66..8b7d062e1 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp.template
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp.template
@@ -31,7 +31,7 @@
 
 #include "Magnum/Platform/Implementation/OpenGLFunctionLoader.h"
 
-void flextGLInit() {
+void flextGLInit(Magnum::GL::Context&) {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
     @if funcs:
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h b/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h
index b4eb32b7a..bf508e14c 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h
@@ -28,6 +28,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -54,7 +55,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */
 
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h.template b/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h.template
index 18e277f7d..a12bc1afb 100644
--- a/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h.template
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h.template
@@ -29,6 +29,7 @@
 #include <Corrade/Utility/VisibilityMacros.h>
 
 #include "Magnum/configure.h"
+#include "Magnum/GL/GL.h"
 
 /* Defensive include guards */
 
@@ -55,7 +56,7 @@
 extern "C" {
 #endif
 
-void flextGLInit();
+void flextGLInit(Magnum::GL::Context& context);
 
 /* Function declaration macros */