Replace GLEW with GLAD (#1684)

Author: Xottab-DUTY

.github/workflows/cibuild.yml

@@ -109,7 +109,7 @@ jobs:
       with:
         arch: ${{ matrix.platform.arch }}
         branch: 'latest-stable'
-        packages: build-base cmake git mold sdl2-dev glew-dev lzo-dev libjpeg-turbo-dev openal-soft-dev libogg-dev libtheora-dev libvorbis-dev
+        packages: build-base cmake git mold sdl2-dev lzo-dev libjpeg-turbo-dev openal-soft-dev libogg-dev libtheora-dev libvorbis-dev
 
     - name: Install Ubuntu packages
       if: ${{ matrix.platform.name == 'Ubuntu' }}
@@ -118,7 +118,6 @@ jobs:
           sudo apt-get update -qq
           sudo apt-get install -qq -y \
               libsdl2-dev:${{ matrix.platform.arch }} \
-              libglew-dev:${{ matrix.platform.arch }} \
               liblzo2-dev:${{ matrix.platform.arch }} \
               libjpeg-dev:${{ matrix.platform.arch }} \
               libopenal-dev:${{ matrix.platform.arch }} \
@@ -130,11 +129,11 @@ jobs:
       if: ${{ matrix.platform.name == 'macOS' }}
       run: |
           brew update
-          brew install sdl2 glew lzo libogg libvorbis theora
+          brew install sdl2 lzo libogg libvorbis theora
 
     - name: Install Fedora packages
       if: ${{ matrix.platform.name == 'Fedora' }}
-      run: dnf install -y git gcc gcc-c++ rpmdevtools cmake SDL2-devel glew-devel lzo-devel libjpeg-turbo-devel openal-devel libogg-devel libtheora-devel libvorbis-devel
+      run: dnf install -y git gcc gcc-c++ rpmdevtools cmake SDL2-devel lzo-devel libjpeg-turbo-devel openal-devel libogg-devel libtheora-devel libvorbis-devel
 
     - name: Set environment variables
       if: ${{ matrix.platform.cc != '' && matrix.platform.cxx != '' }}
@@ -181,13 +180,13 @@ jobs:
       matrix:
         platform:
         - { name: FreeBSD, os: freebsd, os-version: '14.0', arch: x86_64,
-            install-cmd: "sudo pkg update && sudo pkg install -y cmake sdl2 glew lzo2 jpeg-turbo openal-soft libogg libtheora libvorbis"
+            install-cmd: "sudo pkg update && sudo pkg install -y cmake sdl2 lzo2 jpeg-turbo openal-soft libogg libtheora libvorbis"
           }
         - { name: OpenBSD, os: openbsd, os-version: '7.5',  arch: x86_64,
-            install-cmd: "sudo pkg_add cmake SDL2 glew lzo2 jpeg openal libogg libtheora libvorbis",
+            install-cmd: "sudo pkg_add cmake SDL2 lzo2 jpeg openal libogg libtheora libvorbis",
           }
         - { name: NetBSD,  os: netbsd,  os-version: '10.0',  arch: x86_64,
-            install-cmd: "sudo pkgin -y install cmake SDL2 glew lzo libjpeg-turbo openal-soft libogg libtheora libvorbis",
+            install-cmd: "sudo pkgin -y install cmake SDL2 lzo libjpeg-turbo openal-soft libogg libtheora libvorbis",
           }
         configuration: [Debug, Release]
 

CMakeLists.txt

@@ -241,8 +241,6 @@ if (NOT WIN32)
             INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIRS}"
         )
     endif()
-    find_package(OpenGL REQUIRED)
-    find_package(GLEW REQUIRED)
     find_package(OpenAL REQUIRED)
     find_package(JPEG)
     find_package(Ogg REQUIRED)

Externals/gl/include/gl/glext.h

@@ -30,7 +30,6 @@ apt-get install -y \
   gdb \
   wget \
   autoconf \
-  libglew-dev \
   libjpeg-dev \
   libopenal-dev \
   libcrypto++-dev \