Let ENABLE_GLES appear in cmake_config.h and change its functionality

README.md

@@ -220,7 +220,7 @@ General options and their default values:
     ENABLE_CURSES=ON           - Build with (n)curses; Enables a server side terminal (command line option: --terminal)
     ENABLE_FREETYPE=ON         - Build with FreeType2; Allows using TTF fonts
     ENABLE_GETTEXT=ON          - Build with Gettext; Allows using translations
-    ENABLE_GLES=OFF            - Search for Open GLES headers & libraries and use them
+    ENABLE_GLES=OFF            - Build for OpenGL ES instead of OpenGL (requires support by Irrlicht)
     ENABLE_LEVELDB=ON          - Build with LevelDB; Enables use of LevelDB map backend
     ENABLE_POSTGRESQL=ON       - Build with libpq; Enables use of PostgreSQL map backend (PostgreSQL 9.5 or greater recommended)
     ENABLE_REDIS=ON            - Build with libhiredis; Enables use of Redis map backend

src/CMakeLists.txt

@@ -102,10 +102,18 @@ if(BUILD_CLIENT AND ENABLE_SOUND)
 endif()
 
 
-option(ENABLE_GLES "Enable OpenGL ES support" FALSE)
+option(ENABLE_GLES "Use OpenGL ES instead of OpenGL" FALSE)
 mark_as_advanced(ENABLE_GLES)
 if(ENABLE_GLES)
-	find_package(OpenGLES2)
+	find_package(OpenGLES2 REQUIRED)
+elseif()
+	if(NOT WIN32) # Unix probably
+		set(OPENGL_GL_PREFERENCE "LEGACY" CACHE STRING
+			"See CMake Policy CMP0072 for reference. GLVND is broken on some nvidia setups")
+		set(OpenGL_GL_PREFERENCE ${OPENGL_GL_PREFERENCE})
+
+		find_package(OpenGL REQUIRED)
+	endif()
 endif()
 
 
@@ -275,11 +283,6 @@ else()
 			find_package(X11 REQUIRED)
 		endif(NOT HAIKU)
 
-		set(OPENGL_GL_PREFERENCE "LEGACY" CACHE STRING
-			"See CMake Policy CMP0072 for reference. GLVND is broken on some nvidia setups")
-		set(OpenGL_GL_PREFERENCE ${OPENGL_GL_PREFERENCE})
-
-		find_package(OpenGL REQUIRED)
 		find_package(JPEG REQUIRED)
 		find_package(BZip2 REQUIRED)
 		find_package(PNG REQUIRED)
@@ -519,7 +522,6 @@ if(BUILD_CLIENT)
 		${PROJECT_NAME}
 		${ZLIB_LIBRARIES}
 		${IRRLICHT_LIBRARY}
-		${OPENGL_LIBRARIES}
 		${JPEG_LIBRARIES}
 		${BZIP2_LIBRARIES}
 		${PNG_LIBRARIES}
@@ -529,7 +531,6 @@ if(BUILD_CLIENT)
 		${LUA_LIBRARY}
 		${GMP_LIBRARY}
 		${JSON_LIBRARY}
-		${OPENGLES2_LIBRARIES}
 		${PLATFORM_LIBS}
 		${CLIENT_PLATFORM_LIBS}
 	)
@@ -543,6 +544,18 @@ if(BUILD_CLIENT)
 			${client_LIBS}
 		)
 	endif()
+	if(ENABLE_GLES)
+		target_link_libraries(
+			${PROJECT_NAME}
+			${OPENGLES2_LIBRARIES}
+			${EGL_LIBRARIES}
+		)
+	else()
+		target_link_libraries(
+			${PROJECT_NAME}
+			${OPENGL_LIBRARIES}
+		)
+	endif()
 	if(USE_GETTEXT)
 		target_link_libraries(
 			${PROJECT_NAME}

src/cmake_config.h.in

@@ -26,6 +26,7 @@
 #cmakedefine01 USE_SPATIAL
 #cmakedefine01 USE_SYSTEM_GMP
 #cmakedefine01 USE_REDIS
+#cmakedefine01 ENABLE_GLES
 #cmakedefine01 HAVE_ENDIAN_H
 #cmakedefine01 CURSES_HAVE_CURSES_H
 #cmakedefine01 CURSES_HAVE_NCURSES_H