Make OpenGL preference configurable, default to LEGACY (#7666)

SmallJoker · web-flow · commit 785f68ef3366 · 2018-09-22T20:54:43.000+02:00
This partially reverts 1ec5028 Add option OPENGL_GL_PREFERENCE
diff --git a/README.md b/README.md
@@ -212,6 +212,7 @@ General options and their default values:
     ENABLE_LUAJIT=ON           - Build with LuaJIT (much faster than non-JIT Lua)
     ENABLE_SYSTEM_GMP=ON       - Use GMP from system (much faster than bundled mini-gmp)
     ENABLE_SYSTEM_JSONCPP=OFF  - Use JsonCPP from system
+    OPENGL_GL_PREFERENCE=LEGACY - Linux client build only; See CMake Policy CMP0072 for reference
     RUN_IN_PLACE=FALSE         - Create a portable install (worlds, settings etc. in current directory)
     USE_GPROF=FALSE            - Enable profiling using GProf
     VERSION_EXTRA=             - Text to append to version (e.g. VERSION_EXTRA=foobar -> Minetest 0.4.9-foobar)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -296,7 +296,11 @@ else()
 		if(NOT HAIKU)
 			find_package(X11 REQUIRED)
 		endif(NOT HAIKU)
-		set(OpenGL_GL_PREFERENCE "GLVND")
+
+		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)
