Add glad opengl loader

deps/glad/CMakeLists.txt

@@ -0,0 +1,48 @@
+project(glad)
+
+find_package(OpenGL)
+
+if(NOT WIN32 AND NOT APPLE)
+	find_package(X11)
+endif()
+
+set(glad_SOURCES
+	src/glad.c)
+
+if(WIN32)
+	set(glad_PLATFORM_SOURCES
+		src/glad_wgl.c)
+elseif(NOT APPLE)
+	set(glad_PLATFORM_SOURCES
+		src/glad_glx.c)
+endif()
+
+add_library(glad SHARED
+	${glad_SOURCES}
+	${glad_PLATFORM_SOURCES})
+set_target_properties(glad PROPERTIES
+	OUTPUT_NAME obsglad
+	VERSION "0"
+	SOVERSION "0")
+target_include_directories(glad
+	PUBLIC include
+	PRIVATE ${X11_X11_INCLUDE_PATH} ${OPENGL_INCLUDE_DIR})
+target_compile_definitions(glad
+	PRIVATE GLAD_GLAPI_EXPORT_BUILD)
+
+if(NOT WIN32)
+	target_compile_options(glad
+		PRIVATE -DPIC -fPIC -fvisibility=hidden)
+endif()
+
+if(NOT WIN32 AND NOT APPLE)
+	set(glad_PLATFORM_DEPS
+		-ldl
+		${X11_X11_LIB})
+endif()
+
+target_link_libraries(glad
+	${glad_PLATFORM_DEPS}
+	${OPENGL_gl_LIBRARY})
+
+install_obs_core(glad)