From 6bd38ccbb5e876fa5fcc05fa830c8348c8ad716e Mon Sep 17 00:00:00 2001
From: Campbell Barton <campbellbarton>
Date: Tue, 26 Jul 2022 15:08:40 +0200
Subject: replace GLEW with libepoxy

As discussed in https://developer.blender.org/D12034#412258, GLEW should be replaced by libepoxy to enable dynamic loading of OpenGL.

Build:
```sh
make lite debug ninja BUILD_CMAKE_ARGS="-DWITH_GHOST_X11=OFF -DWITH_GHOST_WAYLAND=ON -DWITH_GHOST_WAYLAND_LIBDECOR=ON -DPYTHON_VERSION=3.10" BUILD_DIR="../blender_build"
```

Verify that there are no X11 dependencies any more:
```sh
lddtree ./blender_build/bin/blender
```
and:
```sh
./blender_build/bin/blender
```

should then start a pure Wayland client.

This also works with GLX (`-DWITH_GHOST_X11=ON -DWITH_GHOST_WAYLAND=OFF`).

This has not been tested on other systems (Windows, macOS) as I do not have access to those systems and the build bot does not allow me to trigger experimental builds any more (I get "you need to have role 'any-control'").

Reviewed By: campbellbarton, brecht, jbakker

Differential Revision: https://developer.blender.org/D15291
---
 intern/ghost/CMakeLists.txt                    |  6 +--
 intern/ghost/intern/GHOST_Context.cpp          |  7 +---
 intern/ghost/intern/GHOST_Context.h            |  4 +-
 intern/ghost/intern/GHOST_ContextCGL.mm        |  2 -
 intern/ghost/intern/GHOST_ContextD3D.cpp       |  3 +-
 intern/ghost/intern/GHOST_ContextEGL.cpp       | 57 ++++++++------------------
 intern/ghost/intern/GHOST_ContextEGL.h         |  5 ++-
 intern/ghost/intern/GHOST_ContextGLX.cpp       | 16 +-------
 intern/ghost/intern/GHOST_ContextGLX.h         |  4 +-
 intern/ghost/intern/GHOST_ContextSDL.cpp       |  2 -
 intern/ghost/intern/GHOST_ContextWGL.cpp       | 49 ++++++----------------
 intern/ghost/intern/GHOST_ContextWGL.h         |  4 +-
 intern/ghost/intern/GHOST_SystemX11.cpp        | 10 -----
 intern/ghost/intern/GHOST_WindowSDL.cpp        |  1 -
 intern/ghost/intern/GHOST_WindowX11.cpp        | 10 -----
 intern/ghost/intern/GHOST_Xr_openxr_includes.h |  6 +--
 intern/ghost/test/CMakeLists.txt               | 19 ---------
 17 files changed, 45 insertions(+), 160 deletions(-)

(limited to 'intern/ghost')

diff --git a/intern/ghost/CMakeLists.txt b/intern/ghost/CMakeLists.txt
index c681dc368bb..b854908da78 100644
--- a/intern/ghost/CMakeLists.txt
+++ b/intern/ghost/CMakeLists.txt
@@ -4,13 +4,12 @@
 set(INC
   .
   ../clog
-  ../glew-mx
   ../../source/blender/imbuf
   ../../source/blender/makesdna
 )
 
 set(INC_SYS
-  ${GLEW_INCLUDE_PATH}
+  ${Epoxy_INCLUDE_DIRS}
 )
 
 set(SRC
@@ -71,8 +70,7 @@ set(SRC
 )
 
 set(LIB
-  bf_intern_glew_mx
-  ${GLEW_LIBRARY}
+  ${Epoxy_LIBRARIES}
 )
 
 if(WITH_GHOST_DEBUG)
diff --git a/intern/ghost/intern/GHOST_Context.cpp b/intern/ghost/intern/GHOST_Context.cpp
index f9aa80dc13d..689b3240da3 100644
--- a/intern/ghost/intern/GHOST_Context.cpp
+++ b/intern/ghost/intern/GHOST_Context.cpp
@@ -10,7 +10,7 @@
 #include "GHOST_Context.h"
 
 #ifdef _WIN32
-#  include <GL/wglew.h>  // only for symbolic constants, do not use API functions
+#  include <epoxy/wgl.h>
 #  include <tchar.h>
 #
 #  ifndef ERROR_PROFILE_DOES_NOT_MATCH_DEVICE
@@ -122,11 +122,6 @@ bool win32_chk(bool result, const char *file, int line, const char *text)
 
 #endif  // _WIN32
 
-void GHOST_Context::initContextGLEW()
-{
-  GLEW_CHK(glewInit());
-}
-
 void GHOST_Context::initClearGL()
 {
   glClearColor(0.294, 0.294, 0.294, 0.000);
diff --git a/intern/ghost/intern/GHOST_Context.h b/intern/ghost/intern/GHOST_Context.h
index e707f1c3475..3546fb6bbc7 100644
--- a/intern/ghost/intern/GHOST_Context.h
+++ b/intern/ghost/intern/GHOST_Context.h
@@ -11,7 +11,7 @@
 #include "GHOST_IContext.h"
 #include "GHOST_Types.h"
 
-#include "glew-mx.h"
+#include <epoxy/gl.h>
 
 #include <cstdlib>  // for NULL
 
@@ -136,8 +136,6 @@ class GHOST_Context : public GHOST_IContext {
   }
 
  protected:
-  void initContextGLEW();
-
   bool m_stereoVisual;
 
   /** Caller specified, not for internal use. */
diff --git a/intern/ghost/intern/GHOST_ContextCGL.mm b/intern/ghost/intern/GHOST_ContextCGL.mm
index dd800ef52a3..19df38abb0a 100644
--- a/intern/ghost/intern/GHOST_ContextCGL.mm
+++ b/intern/ghost/intern/GHOST_ContextCGL.mm
@@ -274,8 +274,6 @@ GHOST_TSuccess GHOST_ContextCGL::initializeDrawingContext()
   }
 #endif
 
-  initContextGLEW();
-
   if (m_metalView) {
     if (m_defaultFramebuffer == 0) {
       /* Create a virtual frame-buffer. */
diff --git a/intern/ghost/intern/GHOST_ContextD3D.cpp b/intern/ghost/intern/GHOST_ContextD3D.cpp
index ded76daa145..4fc05cf912c 100644
--- a/intern/ghost/intern/GHOST_ContextD3D.cpp
+++ b/intern/ghost/intern/GHOST_ContextD3D.cpp
@@ -10,8 +10,7 @@
 #include <iostream>
 #include <string>
 
-#include <GL/glew.h>
-#include <GL/wglew.h>
+#include <epoxy/wgl.h>
 
 #include "GHOST_ContextD3D.h"
 #include "GHOST_ContextWGL.h" /* For shared drawing */
diff --git a/intern/ghost/intern/GHOST_ContextEGL.cpp b/intern/ghost/intern/GHOST_ContextEGL.cpp
index 8c44dfe0158..c29e11ccb1d 100644
--- a/intern/ghost/intern/GHOST_ContextEGL.cpp
+++ b/intern/ghost/intern/GHOST_ContextEGL.cpp
@@ -151,15 +151,6 @@ static bool egl_chk(bool result,
 #  define EGL_CHK(x) egl_chk(x)
 #endif
 
-static inline bool bindAPI(EGLenum api)
-{
-  if (EGLEW_VERSION_1_2) {
-    return (EGL_CHK(eglBindAPI(api)) == EGL_TRUE);
-  }
-
-  return false;
-}
-
 #ifdef WITH_GL_ANGLE
 HMODULE GHOST_ContextEGL::s_d3dcompiler = nullptr;
 #endif
@@ -256,7 +247,7 @@ GHOST_TSuccess GHOST_ContextEGL::swapBuffers()
 
 GHOST_TSuccess GHOST_ContextEGL::setSwapInterval(int interval)
 {
-  if (EGLEW_VERSION_1_1) {
+  if (epoxy_egl_version(m_display) >= 11) {
     if (EGL_CHK(::eglSwapInterval(m_display, interval))) {
       m_swap_interval = interval;
 
@@ -313,26 +304,13 @@ GHOST_TSuccess GHOST_ContextEGL::releaseDrawingContext()
   return GHOST_kFailure;
 }
 
-bool GHOST_ContextEGL::initContextEGLEW()
+inline bool GHOST_ContextEGL::bindAPI(EGLenum api)
 {
-  /* We have to manually get this function before we can call eglewInit, since
-   * it requires a display argument. glewInit() does the same, but we only want
-   * to initialize EGLEW here. */
-  eglGetDisplay = (PFNEGLGETDISPLAYPROC)eglGetProcAddress("eglGetDisplay");
-  if (eglGetDisplay == nullptr) {
-    return false;
-  }
-
-  if (!EGL_CHK((m_display = ::eglGetDisplay(m_nativeDisplay)) != EGL_NO_DISPLAY)) {
-    return false;
-  }
-
-  if (GLEW_CHK(eglewInit(m_display)) != GLEW_OK) {
-    fprintf(stderr, "Warning! EGLEW failed to initialize properly.\n");
-    return false;
+  if (epoxy_egl_version(m_display) >= 12) {
+    return (EGL_CHK(eglBindAPI(api)) == EGL_TRUE);
   }
 
-  return true;
+  return false;
 }
 
 static const std::string &api_string(EGLenum api)
@@ -355,10 +333,6 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
   }
   m_stereoVisual = false; /* It doesn't matter what the Window wants. */
 
-  if (!initContextEGLEW()) {
-    return GHOST_kFailure;
-  }
-
 #ifdef WITH_GL_ANGLE
   /* `d3dcompiler_XX.dll` needs to be loaded before ANGLE will work. */
   if (s_d3dcompiler == nullptr) {
@@ -380,6 +354,10 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
 
   EGLint egl_major, egl_minor;
 
+  if (!EGL_CHK((m_display = ::eglGetDisplay(m_nativeDisplay)) != EGL_NO_DISPLAY)) {
+    goto error;
+  }
+
   if (!EGL_CHK(::eglInitialize(m_display, &egl_major, &egl_minor))) {
     goto error;
   }
@@ -398,7 +376,7 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
 
   attrib_list.reserve(20);
 
-  if (m_api == EGL_OPENGL_ES_API && EGLEW_VERSION_1_2) {
+  if (m_api == EGL_OPENGL_ES_API && epoxy_egl_version(m_display) >= 12) {
     /* According to the spec it seems that you are required to set EGL_RENDERABLE_TYPE,
      * but some implementations (ANGLE) do not seem to care. */
 
@@ -421,9 +399,11 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
               m_contextMinorVersion);
     }
 
-    if (!((m_contextMajorVersion == 1) || (m_contextMajorVersion == 2 && EGLEW_VERSION_1_3) ||
-          (m_contextMajorVersion == 3 && /*EGLEW_VERSION_1_4 &&*/ EGLEW_KHR_create_context) ||
-          (m_contextMajorVersion == 3 && EGLEW_VERSION_1_5))) {
+    if (!((m_contextMajorVersion == 1) ||
+          (m_contextMajorVersion == 2 && epoxy_egl_version(m_display) >= 13) ||
+          (m_contextMajorVersion == 3 &&
+           epoxy_has_egl_extension(m_display, "KHR_create_context")) ||
+          (m_contextMajorVersion == 3 && epoxy_egl_version(m_display) >= 15))) {
       fprintf(stderr,
               "Warning! May not be able to create a version %d.%d ES context with version %d.%d "
               "of EGL\n",
@@ -488,7 +468,8 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
   }
   attrib_list.clear();
 
-  if (EGLEW_VERSION_1_5 || EGLEW_KHR_create_context) {
+  if (epoxy_egl_version(m_display) >= 15 ||
+      epoxy_has_egl_extension(m_display, "KHR_create_context")) {
     if (m_api == EGL_OPENGL_API || m_api == EGL_OPENGL_ES_API) {
       if (m_contextMajorVersion != 0) {
         attrib_list.push_back(EGL_CONTEXT_MAJOR_VERSION_KHR);
@@ -530,7 +511,7 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
       }
     }
 
-    if (m_api == EGL_OPENGL_API || EGLEW_VERSION_1_5) {
+    if (m_api == EGL_OPENGL_API || epoxy_egl_version(m_display) >= 15) {
       if (m_contextResetNotificationStrategy != 0) {
         attrib_list.push_back(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR);
         attrib_list.push_back(m_contextResetNotificationStrategy);
@@ -598,8 +579,6 @@ GHOST_TSuccess GHOST_ContextEGL::initializeDrawingContext()
     goto error;
   }
 
-  initContextGLEW();
-
   initClearGL();
   ::eglSwapBuffers(m_display, m_surface);
 
diff --git a/intern/ghost/intern/GHOST_ContextEGL.h b/intern/ghost/intern/GHOST_ContextEGL.h
index 3250dc94978..662ffa94aec 100644
--- a/intern/ghost/intern/GHOST_ContextEGL.h
+++ b/intern/ghost/intern/GHOST_ContextEGL.h
@@ -10,7 +10,8 @@
 #include "GHOST_Context.h"
 #include "GHOST_System.h"
 
-#include <GL/eglew.h>
+#include <epoxy/egl.h>
+#include <epoxy/gl.h>
 
 #ifndef GHOST_OPENGL_EGL_CONTEXT_FLAGS
 #  define GHOST_OPENGL_EGL_CONTEXT_FLAGS 0
@@ -96,7 +97,7 @@ class GHOST_ContextEGL : public GHOST_Context {
   EGLContext getContext() const;
 
  private:
-  bool initContextEGLEW();
+  bool bindAPI(EGLenum api);
 
   const GHOST_System *const m_system;
 
diff --git a/intern/ghost/intern/GHOST_ContextGLX.cpp b/intern/ghost/intern/GHOST_ContextGLX.cpp
index b4a076e4598..ed1c874c236 100644
--- a/intern/ghost/intern/GHOST_ContextGLX.cpp
+++ b/intern/ghost/intern/GHOST_ContextGLX.cpp
@@ -95,11 +95,6 @@ GHOST_TSuccess GHOST_ContextGLX::releaseDrawingContext()
   return ::glXMakeCurrent(m_display, None, nullptr) ? GHOST_kSuccess : GHOST_kFailure;
 }
 
-void GHOST_ContextGLX::initContextGLXEW()
-{
-  initContextGLEW();
-}
-
 GHOST_TSuccess GHOST_ContextGLX::initializeDrawingContext()
 {
   GHOST_X11_ERROR_HANDLERS_OVERRIDE(handler_store);
@@ -278,18 +273,11 @@ GHOST_TSuccess GHOST_ContextGLX::initializeDrawingContext()
 
     glXMakeCurrent(m_display, m_window, m_context);
 
-    /* Seems that this has to be called after #glXMakeCurrent,
-     * which means we cannot use `glX` extensions until after we create a context. */
-    initContextGLXEW();
-
     if (m_window) {
       initClearGL();
       ::glXSwapBuffers(m_display, m_window);
     }
 
-    /* re initialize to get the extensions properly */
-    initContextGLXEW();
-
     version = glGetString(GL_VERSION);
 
     if (!version || version[0] < '3' || ((version[0] == '3') && (version[2] < '3'))) {
@@ -318,7 +306,7 @@ GHOST_TSuccess GHOST_ContextGLX::releaseNativeHandles()
 
 GHOST_TSuccess GHOST_ContextGLX::setSwapInterval(int interval)
 {
-  if (!GLXEW_EXT_swap_control) {
+  if (!epoxy_has_glx_extension(m_display, DefaultScreen(m_display), "GLX_EXT_swap_control")) {
     ::glXSwapIntervalEXT(m_display, m_window, interval);
     return GHOST_kSuccess;
   }
@@ -327,7 +315,7 @@ GHOST_TSuccess GHOST_ContextGLX::setSwapInterval(int interval)
 
 GHOST_TSuccess GHOST_ContextGLX::getSwapInterval(int &intervalOut)
 {
-  if (GLXEW_EXT_swap_control) {
+  if (epoxy_has_glx_extension(m_display, DefaultScreen(m_display), "GLX_EXT_swap_control")) {
     unsigned int interval = 0;
 
     ::glXQueryDrawable(m_display, m_window, GLX_SWAP_INTERVAL_EXT, &interval);
diff --git a/intern/ghost/intern/GHOST_ContextGLX.h b/intern/ghost/intern/GHOST_ContextGLX.h
index c6184bbd3da..d526e6b1b32 100644
--- a/intern/ghost/intern/GHOST_ContextGLX.h
+++ b/intern/ghost/intern/GHOST_ContextGLX.h
@@ -9,7 +9,7 @@
 
 #include "GHOST_Context.h"
 
-#include <GL/glxew.h>
+#include <epoxy/glx.h>
 
 #ifndef GHOST_OPENGL_GLX_CONTEXT_FLAGS
 /* leave as convenience define for the future */
@@ -89,8 +89,6 @@ class GHOST_ContextGLX : public GHOST_Context {
   GHOST_TSuccess getSwapInterval(int &intervalOut);
 
  private:
-  void initContextGLXEW();
-
   Display *m_display;
   GLXFBConfig m_fbconfig;
   Window m_window;
diff --git a/intern/ghost/intern/GHOST_ContextSDL.cpp b/intern/ghost/intern/GHOST_ContextSDL.cpp
index 5b02fe1c1e6..63b5927895d 100644
--- a/intern/ghost/intern/GHOST_ContextSDL.cpp
+++ b/intern/ghost/intern/GHOST_ContextSDL.cpp
@@ -138,8 +138,6 @@ GHOST_TSuccess GHOST_ContextSDL::initializeDrawingContext()
 
     success = (SDL_GL_MakeCurrent(m_window, m_context) < 0) ? GHOST_kFailure : GHOST_kSuccess;
 
-    initContextGLEW();
-
     initClearGL();
     SDL_GL_SwapWindow(m_window);
 
diff --git a/intern/ghost/intern/GHOST_ContextWGL.cpp b/intern/ghost/intern/GHOST_ContextWGL.cpp
index 7417358e9ae..ac56ed45fcb 100644
--- a/intern/ghost/intern/GHOST_ContextWGL.cpp
+++ b/intern/ghost/intern/GHOST_ContextWGL.cpp
@@ -87,7 +87,7 @@ GHOST_TSuccess GHOST_ContextWGL::swapBuffers()
 
 GHOST_TSuccess GHOST_ContextWGL::setSwapInterval(int interval)
 {
-  if (WGLEW_EXT_swap_control)
+  if (epoxy_has_wgl_extension(m_hDC, "WGL_EXT_swap_control"))
     return WIN32_CHK(::wglSwapIntervalEXT(interval)) == TRUE ? GHOST_kSuccess : GHOST_kFailure;
   else
     return GHOST_kFailure;
@@ -95,7 +95,7 @@ GHOST_TSuccess GHOST_ContextWGL::setSwapInterval(int interval)
 
 GHOST_TSuccess GHOST_ContextWGL::getSwapInterval(int &intervalOut)
 {
-  if (WGLEW_EXT_swap_control) {
+  if (epoxy_has_wgl_extension(m_hDC, "WGL_EXT_swap_control")) {
     intervalOut = ::wglGetSwapIntervalEXT();
     return GHOST_kSuccess;
   }
@@ -266,7 +266,7 @@ static HWND clone_window(HWND hWnd, LPVOID lpParam)
   return hwndCloned;
 }
 
-void GHOST_ContextWGL::initContextWGLEW(PIXELFORMATDESCRIPTOR &preferredPFD)
+void GHOST_ContextWGL::initContext(PIXELFORMATDESCRIPTOR &preferredPFD)
 {
   HWND dummyHWND = NULL;
 
@@ -319,12 +319,6 @@ void GHOST_ContextWGL::initContextWGLEW(PIXELFORMATDESCRIPTOR &preferredPFD)
   if (!WIN32_CHK(::wglMakeCurrent(dummyHDC, dummyHGLRC)))
     goto finalize;
 
-  if (GLEW_CHK(glewInit()) != GLEW_OK) {
-    fprintf(stderr, "Warning! Dummy GLEW/WGLEW failed to initialize properly.\n");
-  }
-
-  /* The following are not technically WGLEW, but they also require a context to work. */
-
 #ifndef NDEBUG
   free((void *)m_dummyRenderer);
   free((void *)m_dummyVendor);
@@ -493,11 +487,11 @@ int GHOST_ContextWGL::choose_pixel_format(bool stereoVisual, bool needAlpha)
       0 /* layer, visible, and damage masks (ignored) */
   };
 
-  initContextWGLEW(preferredPFD);
+  initContext(preferredPFD);
 
   int iPixelFormat = 0;
 
-  if (WGLEW_ARB_pixel_format)
+  if (epoxy_has_wgl_extension(m_hDC, "WGL_ARB_pixel_format"))
     iPixelFormat = choose_pixel_format_arb(stereoVisual, needAlpha);
 
   if (iPixelFormat == 0)
@@ -526,7 +520,7 @@ GHOST_TSuccess GHOST_ContextWGL::initializeDrawingContext()
   HDC prevHDC = ::wglGetCurrentDC();
   WIN32_CHK(GetLastError() == NO_ERROR);
 
-  if (!WGLEW_ARB_create_context || ::GetPixelFormat(m_hDC) == 0) {
+  if (!epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context") || ::GetPixelFormat(m_hDC) == 0) {
     const bool needAlpha = m_alphaBackground;
     int iPixelFormat;
     int lastPFD;
@@ -554,41 +548,24 @@ GHOST_TSuccess GHOST_ContextWGL::initializeDrawingContext()
     }
   }
 
-  if (WGLEW_ARB_create_context) {
+  if (epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context")) {
     int profileBitCore = m_contextProfileMask & WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
     int profileBitCompat = m_contextProfileMask & WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
 
-#ifdef WITH_GLEW_ES
-    int profileBitES = m_contextProfileMask & WGL_CONTEXT_ES_PROFILE_BIT_EXT;
-#endif
-
-    if (!WGLEW_ARB_create_context_profile && profileBitCore)
+    if (!epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context_profile") && profileBitCore)
       fprintf(stderr, "Warning! OpenGL core profile not available.\n");
 
-    if (!WGLEW_ARB_create_context_profile && profileBitCompat)
+    if (!epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context_profile") && profileBitCompat)
       fprintf(stderr, "Warning! OpenGL compatibility profile not available.\n");
 
-#ifdef WITH_GLEW_ES
-    if (!WGLEW_EXT_create_context_es_profile && profileBitES && m_contextMajorVersion == 1)
-      fprintf(stderr, "Warning! OpenGL ES profile not available.\n");
-
-    if (!WGLEW_EXT_create_context_es2_profile && profileBitES && m_contextMajorVersion == 2)
-      fprintf(stderr, "Warning! OpenGL ES2 profile not available.\n");
-#endif
-
     int profileMask = 0;
 
-    if (WGLEW_ARB_create_context_profile && profileBitCore)
+    if (epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context_profile") && profileBitCore)
       profileMask |= profileBitCore;
 
-    if (WGLEW_ARB_create_context_profile && profileBitCompat)
+    if (epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context_profile") && profileBitCompat)
       profileMask |= profileBitCompat;
 
-#ifdef WITH_GLEW_ES
-    if (WGLEW_EXT_create_context_es_profile && profileBitES)
-      profileMask |= profileBitES;
-#endif
-
     if (profileMask != m_contextProfileMask)
       fprintf(stderr, "Warning! Ignoring untested OpenGL context profile mask bits.");
 
@@ -615,7 +592,7 @@ GHOST_TSuccess GHOST_ContextWGL::initializeDrawingContext()
     }
 
     if (m_contextResetNotificationStrategy != 0) {
-      if (WGLEW_ARB_create_context_robustness) {
+      if (epoxy_has_wgl_extension(m_hDC, "WGL_ARB_create_context_robustness")) {
         iAttributes.push_back(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB);
         iAttributes.push_back(m_contextResetNotificationStrategy);
       }
@@ -651,8 +628,6 @@ GHOST_TSuccess GHOST_ContextWGL::initializeDrawingContext()
     goto error;
   }
 
-  initContextGLEW();
-
   if (is_crappy_intel_card()) {
     /* Some Intel cards with context 4.1 or 4.2
      * don't have the point sprite enabled by default.
diff --git a/intern/ghost/intern/GHOST_ContextWGL.h b/intern/ghost/intern/GHOST_ContextWGL.h
index ca0bf70b128..3c65cb0b74e 100644
--- a/intern/ghost/intern/GHOST_ContextWGL.h
+++ b/intern/ghost/intern/GHOST_ContextWGL.h
@@ -11,7 +11,7 @@
 
 #include "GHOST_Context.h"
 
-#include <GL/wglew.h>
+#include <epoxy/wgl.h>
 
 #ifndef GHOST_OPENGL_WGL_RESET_NOTIFICATION_STRATEGY
 #  define GHOST_OPENGL_WGL_RESET_NOTIFICATION_STRATEGY 0
@@ -90,7 +90,7 @@ class GHOST_ContextWGL : public GHOST_Context {
   int choose_pixel_format_arb(bool stereoVisual, bool needAlpha);
   int _choose_pixel_format_arb_1(bool stereoVisual, bool needAlpha);
 
-  void initContextWGLEW(PIXELFORMATDESCRIPTOR &preferredPFD);
+  void initContext(PIXELFORMATDESCRIPTOR &preferredPFD);
 
   HWND m_hWnd;
   HDC m_hDC;
diff --git a/intern/ghost/intern/GHOST_SystemX11.cpp b/intern/ghost/intern/GHOST_SystemX11.cpp
index 00cc5f3af8f..d5ab1aef607 100644
--- a/intern/ghost/intern/GHOST_SystemX11.cpp
+++ b/intern/ghost/intern/GHOST_SystemX11.cpp
@@ -394,16 +394,6 @@ GHOST_IContext *GHOST_SystemX11::createOffscreenContext(GHOST_GLSettings glSetti
 
   const bool debug_context = (glSettings.flags & GHOST_glDebugContext) != 0;
 
-#if defined(WITH_GL_PROFILE_CORE)
-  {
-    const char *version_major = (char *)glewGetString(GLEW_VERSION_MAJOR);
-    if (version_major != nullptr && version_major[0] == '1') {
-      fprintf(stderr, "Error: GLEW version 2.0 and above is required.\n");
-      abort();
-    }
-  }
-#endif
-
   const int profile_mask =
 #ifdef WITH_GL_EGL
 #  if defined(WITH_GL_PROFILE_CORE)
diff --git a/intern/ghost/intern/GHOST_WindowSDL.cpp b/intern/ghost/intern/GHOST_WindowSDL.cpp
index 09192d989e4..59dc80cf7e6 100644
--- a/intern/ghost/intern/GHOST_WindowSDL.cpp
+++ b/intern/ghost/intern/GHOST_WindowSDL.cpp
@@ -6,7 +6,6 @@
 
 #include "GHOST_WindowSDL.h"
 #include "SDL_mouse.h"
-#include "glew-mx.h"
 
 #include "GHOST_ContextSDL.h"
 
diff --git a/intern/ghost/intern/GHOST_WindowX11.cpp b/intern/ghost/intern/GHOST_WindowX11.cpp
index 01045c516c1..9c56a0634ff 100644
--- a/intern/ghost/intern/GHOST_WindowX11.cpp
+++ b/intern/ghost/intern/GHOST_WindowX11.cpp
@@ -1299,16 +1299,6 @@ GHOST_Context *GHOST_WindowX11::newDrawingContext(GHOST_TDrawingContextType type
      * - Try 3.3 core profile
      * - No fall-backs. */
 
-#if defined(WITH_GL_PROFILE_CORE)
-    {
-      const char *version_major = (char *)glewGetString(GLEW_VERSION_MAJOR);
-      if (version_major != nullptr && version_major[0] == '1') {
-        fprintf(stderr, "Error: GLEW version 2.0 and above is required.\n");
-        abort();
-      }
-    }
-#endif
-
     const int profile_mask =
 #ifdef WITH_GL_EGL
 #  if defined(WITH_GL_PROFILE_CORE)
diff --git a/intern/ghost/intern/GHOST_Xr_openxr_includes.h b/intern/ghost/intern/GHOST_Xr_openxr_includes.h
index 9706f51c027..9f993ae45c2 100644
--- a/intern/ghost/intern/GHOST_Xr_openxr_includes.h
+++ b/intern/ghost/intern/GHOST_Xr_openxr_includes.h
@@ -29,11 +29,9 @@
 #endif
 #ifdef WITH_GHOST_X11
 #  ifdef WITH_GL_EGL
-/* TODO: Why do we have to create this typedef manually? */
-typedef void (*(*PFNEGLGETPROCADDRESSPROC)(const char *procname))(void);
-#    include <GL/eglew.h>
+#    include <epoxy/egl.h>
 #  else
-#    include <GL/glxew.h>
+#    include <epoxy/glx.h>
 #  endif
 #endif
 
diff --git a/intern/ghost/test/CMakeLists.txt b/intern/ghost/test/CMakeLists.txt
index 9cc406313c7..95415f4e9b9 100644
--- a/intern/ghost/test/CMakeLists.txt
+++ b/intern/ghost/test/CMakeLists.txt
@@ -155,13 +155,6 @@ suffix_relpaths(SRC_NEW "${SRC}" "../../../extern/wcwidth/")
 include_directories(${INC_NEW})
 add_library(wcwidth_lib ${SRC_NEW})
 
-# glew-mx
-include(${CMAKE_SOURCE_DIR}/../../../intern/glew-mx/CMakeLists.txt)
-suffix_relpaths(INC_NEW "${INC}" "../../../intern/glew-mx/")
-suffix_relpaths(SRC_NEW "${SRC}" "../../../intern/glew-mx/")
-include_directories(${INC_NEW})
-add_library(glewmx_lib ${SRC_NEW})
-
 # grr, blenfont needs BLI
 include_directories(
   "../../../source/blender/blenlib"
@@ -217,21 +210,12 @@ endif()
 
 if(UNIX AND NOT APPLE)
   find_package(X11 REQUIRED)
-  find_package(GLEW)
-
-  if(NOT GLEW_FOUND)
-    message(FATAL_ERROR "GLEW is required to build blender, install it or disable WITH_SYSTEM_GLEW")
-  endif()
 
   set(PLATFORM_LINKLIBS
     ${X11_X11_LIB}
     ${X11_Xinput_LIB}
-    ${GLEW_LIBRARY}
     -lpthread
   )
-else()
-  # set(GLEW_LIBRARY "")  # unused
-  set(GLEW_INCLUDE_PATH "${CMAKE_SOURCE_DIR}/extern/glew/include")
 endif()
 
 string(APPEND CMAKE_C_FLAGS " ${PLATFORM_CFLAGS}")
@@ -246,7 +230,6 @@ add_executable(gears_c
 
 target_link_libraries(gears_c
     ghost_lib
-    glewmx_lib
     string_lib
     ${OPENGL_gl_LIBRARY}
     ${CMAKE_DL_LIBS}
@@ -260,7 +243,6 @@ add_executable(gears_cpp
 
 target_link_libraries(gears_cpp
     ghost_lib
-    glewmx_lib
     string_lib
     ${OPENGL_gl_LIBRARY}
     ${CMAKE_DL_LIBS}
@@ -287,7 +269,6 @@ target_link_libraries(multitest_c
   # imbuf_lib
   ghost_lib
   bli_lib  # again...
-  glewmx_lib
   string_lib
   numaapi_lib
   guardedalloc_lib
-- 
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