Linux: support EGL

- skia library is now shared (CI/scripts needs fixes)
- skia can now be built against EGL (USE_EGL=ON)

Last changes for initial wayland support.

Ref: #396

src/cmake/friction-common.cmake

@@ -69,20 +69,6 @@ if(MSVC)
     add_definitions("/MP")
 endif()
 
-if(UNIX AND NOT APPLE)
-    option(STATIC_FFMPEG "Link against static ffmpeg" OFF)
-    if(${STATIC_FFMPEG})
-        set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-Bsymbolic")
-    endif()
-endif()
-
-if(NOT WIN32)
-    if ((NOT ${CMAKE_VERSION} VERSION_LESS 3.11) AND (NOT OpenGL_GL_PREFERENCE))
-        set(OpenGL_GL_PREFERENCE "GLVND")
-    endif()
-    find_package(OpenGL REQUIRED)
-endif()
-
 find_package(PkgConfig QUIET)
 find_package(QT NAMES Qt5 COMPONENTS Core REQUIRED)
 find_package(
@@ -117,13 +103,8 @@ if(WIN32)
     add_definitions(-DSKIA_DLL)
     set(SKIA_LIBRARIES_DIRS ${CMAKE_SOURCE_DIR}/sdk/bin)
 else()
-    if(APPLE)
-        set(SKIA_LIBRARIES skia)
-    else()
-        set(SKIA_LIBRARIES
-            skia
-            fontconfig
-            ${OPENGL_LIBRARY})
+    set(SKIA_LIBRARIES skia)
+    if(UNIX AND NOT APPLE)
         pkg_check_modules(UNWIND REQUIRED libunwind)
         set(GPERF_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/../gperftools ${UNWIND_INCLUDE_DIRS})
         set(GPERF_LIBRARIES tcmalloc_static ${UNWIND_LIBRARIES})

src/core/appsupport.cpp

@@ -991,8 +991,9 @@ void AppSupport::initEnv(const bool &isRenderer)
     if (isRenderer) { // Force Mesa if Renderer
         qputenv("LIBGL_ALWAYS_SOFTWARE", "1");
     }
-    // Force XCB on Linux until we support Wayland
+#ifdef PROJECT_OFFICIAL
     qputenv("QT_QPA_PLATFORM", isRenderer ? "offscreen" : "xcb");
+#endif
 #else
     Q_UNUSED(isRenderer)
 #endif

src/engine/CMakeLists.txt

@@ -29,6 +29,10 @@ option(LINUX_DEPLOY "Linux Deploy" OFF)
 option(MAC_DEPLOY "Mac Deploy" OFF)
 option(SYNC_SKIA_DEPS "Sync third-party depends" ON)
 
+if(UNIX AND NOT APPLE)
+    option(USE_EGL "Use EGL in skia" OFF)
+endif()
+
 set(SKIA_SRC "${CMAKE_CURRENT_SOURCE_DIR}/skia")
 set(SKIA_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/skia")
 
@@ -72,6 +76,10 @@ else()
     endif()
     set(SKIA_ARGS "ar=\"${CMAKE_AR}\" cc=\"${CMAKE_C_COMPILER}\" cxx=\"${CMAKE_CXX_COMPILER}\"")
     if(UNIX AND NOT APPLE)
+        if(${USE_EGL})
+            set(SKIA_ARGS "${SKIA_ARGS} skia_use_egl=true")
+        endif()
+        set(SKIA_ARGS "${SKIA_ARGS} is_component_build=true")
         if (${LINUX_DEPLOY})
             set(SKIA_ARGS "${SKIA_ARGS} extra_cflags=[\"-Wno-error\"]")
         else()