libobs: Build SIMDE on platforms without SSE2

SIMDE was introduced for aarch64 support, however, the library itself
supports non-SIMD fallback, which allows us provide support to other
platforms without code changes.

There is another world beyond x86. So we can simply enable SIMDE for
processors without SSE2 support.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

libobs/CMakeLists.txt

@@ -174,20 +174,21 @@ elseif(UNIX)
 		util/pipe-posix.c
 		util/platform-nix.c)
 
-	if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
+	if(NEEDS_SIMDE)
 		set(libobs_PLATFORM_HEADERS
-			util/aarch/check.h
-			util/aarch/hedley.h
-			util/aarch/mmx.h
-			util/aarch/simde-arch.h
-			util/aarch/simde-common.h
-			util/aarch/sse.h
-			util/aarch/sse2.h
+			util/simde/check.h
+			util/simde/hedley.h
+			util/simde/mmx.h
+			util/simde/simde-arch.h
+			util/simde/simde-common.h
+			util/simde/sse.h
+			util/simde/sse2.h
 			util/threading-posix.h)
 	else()
 		set(libobs_PLATFORM_HEADERS
 			util/threading-posix.h)
 	endif()
+
 	if(HAVE_PULSEAUDIO)
 		set(libobs_audio_monitoring_HEADERS
 			audio-monitoring/pulse/pulseaudio-wrapper.h)
@@ -475,22 +476,9 @@ target_compile_definitions(libobs
 	PUBLIC
 		HAVE_OBSCONFIG_H)
 
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64(le)?")
-	target_compile_options(libobs
-		PUBLIC
-			-mvsx)
-	add_compile_definitions(NO_WARN_X86_INTRINSICS)
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
-        target_compile_options(libobs
-                        PUBLIC)
-elseif(NOT MSVC)
-	target_compile_options(libobs
-		PUBLIC
-			-mmmx
-			-msse
-			-msse2)
-endif()
-
+target_compile_options(libobs
+	PUBLIC
+	${ARCH_SIMD_FLAGS})
 
 target_compile_options(libobs
 	PUBLIC

libobs/obsconfig.h.in

@@ -19,6 +19,7 @@
 #define HAVE_DBUS @HAVE_DBUS@
 #define HAVE_PULSEAUDIO @HAVE_PULSEAUDIO@
 #define USE_XINPUT @USE_XINPUT@
+#define NEEDS_SIMDE @NEEDS_SIMDE@
 #define LIBOBS_IMAGEMAGICK_DIR_STYLE_6L 6
 #define LIBOBS_IMAGEMAGICK_DIR_STYLE_7GE 7
 #define LIBOBS_IMAGEMAGICK_DIR_STYLE @LIBOBS_IMAGEMAGICK_DIR_STYLE@

libobs/util/sse-intrin.h

@@ -17,9 +17,9 @@
 
 #pragma once
 
-#ifdef __aarch64__
+#if NEEDS_SIMDE
 
-#include "aarch/sse2.h"
+#include "simde/sse2.h"
 
 #define __m128 simde__m128
 #define _mm_setzero_ps simde_mm_setzero_ps