creation of opengl 1.5 context, mixing of gl calls with sdl renderer

CMakeLists.txt

@@ -26,6 +26,7 @@ add_subdirectory(third-party/libxm)
 set(SOURCE_FILES
         third-party/physfs/extras/physfsrwops.c
         third-party/stb/stb_vorbis.c
+        third-party/glad/src/glad.c
 
         src/config.h
         src/context.h
@@ -80,7 +81,7 @@ else()
         set(WARNING_FLAGS
                 -Wall
                 -Wextra
-                -pedantic-errors
+                -Wpedantic
                 -Wshadow
                 -Wdouble-promotion
                 -Wconversion -Wno-sign-conversion
@@ -120,6 +121,7 @@ target_include_directories(${PROJECT_NAME}
         third-party/physfs/src
         third-party/physfs/extras
         third-party/libxm/include
+        third-party/glad/include
 )
 
 # header-only libraries should be marked as "system includes"