Initial macOS support

Compiles successfully, but no idea if it runs as I can't test OpenGL in a VM.

CMakeLists.txt

@@ -53,6 +53,8 @@ elseif(SCREENSHOT_BUILD)
 	set(TMS_BACKEND "screenshot-linux")
 elseif(HAIKU)
 	set(TMS_BACKEND "haiku")
+elseif(APPLE)
+	set(TMS_BACKEND "macos")
 else()
 	set(TMS_BACKEND "linux")
 endif()
@@ -271,6 +273,8 @@ else()
 		set(COMMON_FLAGS "${COMMON_FLAGS} -DGL_GLEXT_PROTOTYPES -DNO_UI -DTMS_BACKEND_LINUX_SS")
 	elseif(HAIKU)
 		set(COMMON_FLAGS "${COMMON_FLAGS} -DTMS_BACKEND_HAIKU")
+	elseif(APPLE)
+		set(COMMON_FLAGS "${COMMON_FLAGS} -DTMS_BACKEND_MACOS")
 	else()
 		set(COMMON_FLAGS "${COMMON_FLAGS} -DTMS_BACKEND_LINUX")
 	endif()
@@ -292,9 +296,12 @@ set(CMAKE_CXX_FLAGS_RELEASE "${COMMON_FLAGS_RELEASE} -O2 -fvisibility-inlines-hi
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELEASE} -g")
 set(CMAKE_CXX_FLAGS_DEBUG "${COMMON_FLAGS_DEBUG}")
 
-set(CMAKE_EXE_LINKER_FLAGS_RELEASE "-Wl,-O,-s,--gc-sections")
-set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "-Wl,-O,--gc-sections")
-set(CMAKE_EXE_LINKER_FLAGS_DEBUG "")
+# macOS Clang's linker doesn't like these flags
+if(NOT APPLE)
+	set(CMAKE_EXE_LINKER_FLAGS_RELEASE "-Wl,-O,-s,--gc-sections")
+	set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "-Wl,-O,--gc-sections")
+	set(CMAKE_EXE_LINKER_FLAGS_DEBUG "")
+endif()
 
 if(WIN32)
 	set(CMAKE_EXE_LINKER_FLAGS_RELEASE "-mwindows")

src/tms/backends/macos/main.cc

@@ -0,0 +1,2 @@
+// Inherit from Linux backend
+#include "../linux/main.cc"

src/tms/core/backend.h

@@ -1,22 +1,6 @@
 #ifndef _BACKEND__H_
 #define _BACKEND__H_
 
-#if !defined TMS_BACKEND_LINUX \
- && !defined TMS_BACKEND_LINUX_SS \
- && !defined TMS_BACKEND_ANDROID \
- && !defined TMS_BACKEND_WINDOWS \
- && !defined TMS_BACKEND_IOS \
- && !defined TMS_BACKEND_HAIKU
-	#error Undefined platform, please add a TMS backend for it
-#endif
-
-#if !defined TMS_BACKEND_PC \
- && !defined TMS_BACKEND_MOBILE
-	#error Either TMS_BACKEND_PC or TMS_BACKEND_MOBILE need to be defined for your platform.
-#endif
-
-#include <tms/core/err.h>
-
 #if defined(TMS_BACKEND_WINDOWS)
 	#define OS_STRING "Windows"
 #elif defined(TMS_BACKEND_LINUX) || defined(TMS_BACKEND_LINUX_SS)
@@ -27,10 +11,19 @@
 	#define OS_STRING "iOS"
 #elif defined(TMS_BACKEND_HAIKU)
 	#define OS_STRING "Haiku"
+#elif defined(TMS_BACKEND_MACOS)
+	#define OS_STRING "macOS"
 #else
-	#define OS_STRING "unknown"
+	#error Undefined platform, please add a TMS backend for it
 #endif
 
+#if !defined TMS_BACKEND_PC \
+ && !defined TMS_BACKEND_MOBILE
+	#error Either TMS_BACKEND_PC or TMS_BACKEND_MOBILE need to be defined for your platform.
+#endif
+
+#include <tms/core/err.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif

src/tms/core/pipeline.c

@@ -10,7 +10,7 @@
 static struct tms_pipeline pipelines[TMS_NUM_PIPELINES] = {0};
 static int n_local_uniforms = 0;
 
-#if defined(TMS_BACKEND_WINDOWS) || defined(TMS_BACKEND_LINUX) || defined(TMS_BACKEND_HAIKU)
+#if defined(TMS_BACKEND_PC) || !defined(TMS_BACKEND_LINUX_SS)
 // Some things in the pipeline are different for Windows/Linux as compared to Android (GL/GLES differences? dunno)
 // The desktop pipeline is the "cool" pipeline as decided by me.
 #define TMS_COOL_PIPELINE