Allow to build PrusaSlicer with EGL support

CMakeLists.txt

@@ -33,8 +33,12 @@ else()
         endif()
 endif()
 
-option(SLIC3R_STATIC 			"Compile PrusaSlicer with static libraries (Boost, TBB, glew)" ${SLIC3R_STATIC_INITIAL})
+option(SLIC3R_STATIC 			"Compile PrusaSlicer with static libraries (Boost, TBB)" ${SLIC3R_STATIC_INITIAL})
 option(SLIC3R_GUI    			"Compile PrusaSlicer with GUI components (OpenGL, wxWidgets)" 1)
+# A lot of Linux distribution don't build wxWidgets with EGL support yet. This
+# is why by default this option is set to OFF. If a Linux distribution has
+# built wxWidgets EGL support, you should turn that on!
+option(SLIC3R_EGL               "Compile PrusaSlicer with Wayland (EGL) support" OFF)
 option(SLIC3R_FHS               "Assume PrusaSlicer is to be installed in a FHS directory structure" 0)
 option(SLIC3R_PCH               "Use precompiled headers" 1)
 option(SLIC3R_MSVC_COMPILE_PARALLEL "Compile on Visual Studio in parallel" 1)
@@ -474,14 +478,6 @@ find_package(PNG REQUIRED)
 set(OpenGL_GL_PREFERENCE "LEGACY")
 find_package(OpenGL REQUIRED)
 
-# Find glew or use bundled version
-if (SLIC3R_STATIC AND NOT SLIC3R_STATIC_EXCLUDE_GLEW)
-    set(GLEW_USE_STATIC_LIBS ON)
-    set(GLEW_VERBOSE ON)
-endif()
-
-find_package(GLEW REQUIRED)
-
 # Find the Cereal serialization library
 find_package(cereal REQUIRED)
 add_library(libcereal INTERFACE)

bundled_deps/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_subdirectory(admesh)
 add_subdirectory(avrdude)
 add_subdirectory(miniz)
+add_subdirectory(glad)
 add_subdirectory(glu-libtess)
 add_subdirectory(agg)
 add_subdirectory(libigl)

bundled_deps/glad/CMakeLists.txt

@@ -0,0 +1,17 @@
+# This has been created by the Vulkan/GL/GLES/EGL/GLX/WGL Loader-Generator
+#
+# See https://glad.sh/ for the webservice
+#
+# Permalink to code:
+# https://gen.glad.sh/#generator=c&api=gl%3D4.6%2Cgles2%3D3.2&profile=gl%3Dcompatibility%2Cgles1%3Dcommon&extensions=GL_ARB_compatibility%2CGL_ARB_framebuffer_object%2CGL_EXT_framebuffer_blit%2CGL_EXT_framebuffer_multisample%2CGL_EXT_framebuffer_object%2CGL_EXT_texture_compression_s3tc%2CGL_EXT_texture_filter_anisotropic%2CGL_KHR_debug&options=LOADER
+add_library(glad_gl STATIC ${CMAKE_CURRENT_SOURCE_DIR}/src/gl.c)
+target_include_directories(
+    glad_gl PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+add_library(GLAD::GL ALIAS glad_gl)
+
+add_library(glad_gles STATIC ${CMAKE_CURRENT_SOURCE_DIR}/src/gl.c)
+target_include_directories(
+    glad_gles PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+add_library(GLAD::GLES ALIAS glad_gles)