1 files changed, 16 insertions, 3 deletions

diff --git a/cmake/platform/linux/gbm.cmake b/cmake/platform/linux/gbm.cmake
index d8e73d0..e5b44ad 100644
--- a/cmake/platform/linux/gbm.cmake
+++ b/cmake/platform/linux/gbm.cmake
@@ -1,4 +1,17 @@
-set(PLATFORM_REQUIRED_DEPS OpenGLES EGL GBM LibDRM)
+set(PLATFORM_REQUIRED_DEPS EGL GBM LibDRM LibInput Xkbcommon)
 set(PLATFORM_OPTIONAL_DEPS VAAPI)
-set(APP_RENDER_SYSTEM gles)
-list(APPEND PLATFORM_DEFINES -DMESA_EGL_NO_X11_HEADERS -DPLATFORM_SETTINGS_FILE=gbm.xml)
+
+set(GBM_RENDER_SYSTEM "" CACHE STRING "Render system to use with GBM: \"gl\" or \"gles\"")
+
+if(GBM_RENDER_SYSTEM STREQUAL "gl")
+  list(APPEND PLATFORM_REQUIRED_DEPS OpenGl)
+  set(APP_RENDER_SYSTEM gl)
+elseif(GBM_RENDER_SYSTEM STREQUAL "gles")
+  list(APPEND PLATFORM_REQUIRED_DEPS OpenGLES)
+  set(APP_RENDER_SYSTEM gles)
+else()
+  message(SEND_ERROR "You need to decide whether you want to use GL- or GLES-based rendering in combination with the GBM windowing system. Please set GBM_RENDER_SYSTEM to either \"gl\" or \"gles\". For normal desktop systems, you will usually want to use \"gl\".")
+endif()
+
+# __GBM__ is needed by eglplatform.h in case it is included before gbm.h
+list(APPEND PLATFORM_DEFINES -DMESA_EGL_NO_X11_HEADERS -D__GBM__=1 -DPLATFORM_SETTINGS_FILE=gbm.xml)