Ensure OPENGLES flag can be used in CMakeLists.txt

Author: JeodC

CMakeLists.txt

@@ -131,6 +131,7 @@ endif()
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU|Clang|AppleClang")
     set(COMMON_FLAGS "-Wall -Wextra -Wno-error \
             -Wno-macro-redefined \
+            -Wno-inconsistent-missing-override \
             -Wno-return-type \
             -Wno-unused-parameter \
             -Wno-unused-function \
@@ -180,6 +181,9 @@ else()
     set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g -DNDEBUG ${COMMON_CXX_FLAGS}")
 endif()
 
+# Toggle for GLES (Required for many ARM/Mobile platforms)
+option(USE_OPENGLES "Use OpenGLES instead of Desktop OpenGL" ON)
+
 # Set game compilation version
 set(VERSION us)
 set(USE_NETWORKING OFF)
@@ -191,6 +195,7 @@ set(GFX_DEBUG_DISASSEMBLER OFF)
 # Add compile definitions for the target
 add_compile_definitions(
     VERSION_US=1
+    $<$<BOOL:${USE_OPENGLES}>:USE_OPENGLES>
     ENABLE_RUMBLE=1
     F3DEX_GBI=1
     _LANGUAGE_C
@@ -204,7 +209,11 @@ add_compile_definitions(
 
 # Find necessary libraries
 if (UNIX AND NOT APPLE)
-find_package(OpenGL REQUIRED)
+    if (NOT USE_OPENGLES)
+        find_package(OpenGL REQUIRED)
+    else()
+        set(ADDITIONAL_LIBRARY_DEPENDENCIES ${ADDITIONAL_LIBRARY_DEPENDENCIES} GLESv2)
+    endif()
 endif()
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")