make threaded rendering the default on all platforms

synchronous mode enabled unless LOW_END is defined
info and warning for xBRZ upscaling core option

Makefile

@@ -20,8 +20,6 @@ HAVE_CHD      := 1
 HAVE_CLANG    ?= 0
 HAVE_CDROM    := 0
 HAVE_MODEM    := 1
-THREADED_RENDERING_DEFAULT := 0
-
 
 TARGET_NAME   := flycast
 
@@ -165,7 +163,6 @@ else ifneq (,$(findstring rpi,$(platform)))
 	LIBS += -lrt
 	ARM_FLOAT_ABI_HARD = 1
 	SINGLE_PREC_FLAGS = 1
-	THREADED_RENDERING_DEFAULT = 1
 	
 	ifneq (,$(findstring rpi4,$(platform)))
 		# rpi4 flags are taken from rockpro64
@@ -258,7 +255,6 @@ else ifeq ($(platform), classic_armv8_a35)
 	SINGLE_PREC_FLAGS = 1
 	HAVE_LTCG = 0
 	HAVE_OPENMP = 0
-	THREADED_RENDERING_DEFAULT = 1
 	CFLAGS += -Ofast \
 	-flto -fuse-linker-plugin \
 	-fno-stack-protector -fno-ident -fomit-frame-pointer \
@@ -328,7 +324,6 @@ else ifeq ($(platform), sun8i_legacy)
 	SINGLE_PREC_FLAGS = 1
 	HAVE_LTCG = 0
 	HAVE_OPENMP = 0
-	THREADED_RENDERING_DEFAULT = 1
 	CFLAGS += -Ofast \
 	-flto -fuse-linker-plugin \
 	-fno-stack-protector -fno-ident -fomit-frame-pointer \
@@ -416,7 +411,6 @@ else ifeq ($(platform), libnx)
    HAVE_MODEM = 1
    HAVE_LTCG = 0
    NO_NVMEM = 1
-   THREADED_RENDERING_DEFAULT = 1
    # stubs
    SOURCES_C += $(CORE_DIR)/core/deps/switch/stubs.c
 #######################################
@@ -645,7 +639,6 @@ else ifneq (,$(findstring ios,$(platform)))
 	GLES = 1
 	WITH_DYNAREC=
 	PLATFORM_EXT := unix
-	THREADED_RENDERING_DEFAULT = 1
 	#HOST_CPU_FLAGS = -DHOST_CPU=$(HOST_CPU_ARM)
 
 	PLATCFLAGS += -DHAVE_POSIX_MEMALIGN -DNO_ASM
@@ -687,7 +680,6 @@ else ifneq (,$(findstring theos_ios,$(platform)))
 	FORCE_GLES = 1
 	WITH_DYNAREC=arm
 	HAVE_GENERIC_JIT = 0
-	THREADED_RENDERING_DEFAULT = 1
 
 	PLATCFLAGS += -DHAVE_POSIX_MEMALIGN -DNO_ASM
 	PLATCFLAGS += -DIOS -marm
@@ -729,10 +721,8 @@ else ifeq ($(platform), qnx)
 	FORCE_GLES = 1
 	DEFINES += -DTHREADED_RENDERING_DEFAULT
 	PLATCFLAGS += -DNO_ASM -D__BLACKBERRY_QNX__
-	THREADED_RENDERING_DEFAULT = 1
 	CPUFLAGS += -marm -mcpu=cortex-a9 -mfpu=neon -mfloat-abi=softfp -D__arm__ -DARM_ASM -D__NEON_OPT
 	CFLAGS += -D__QNX__
-	THREADED_RENDERING_DEFAULT = 1
 
 	PLATFORM_EXT := unix
 
@@ -746,7 +736,6 @@ else ifneq (,$(findstring armv,$(platform)))
 	WITH_DYNAREC=arm
 	HAVE_GENERIC_JIT = 0
 	PLATCFLAGS += -DARM
-	THREADED_RENDERING_DEFAULT = 1
 	ifneq (,$(findstring gles,$(platform)))
 		FORCE_GLES = 1
 	endif

Makefile.common

@@ -10,14 +10,6 @@ INCFLAGS    += -I$(CORE_DIR)/core/libretro \
 					-I$(DEPS_DIR)/vixl \
 					-I$(DEPS_DIR)/stb
 
-ifeq ($(THREADED_RENDERING_DEFAULT), 1)
-CORE_DEFINES += -DTHREADED_RENDERING_DEFAULT
-endif
-
-ifeq ($(THREADED_RENDERING_DEFAULT), 1)
-CORE_DEFINES += -DTHREADED_RENDERING_DEFAULT
-endif
-
 SOURCES_C   ?=
 SOURCES_CXX := \
 					$(CORE_DIR)/core/hw/arm7/arm_mem.cpp \

core/libretro/libretro_core_options.h

@@ -560,7 +560,7 @@ struct retro_core_option_definition option_defs_us[] = {
    {
       CORE_OPTION_NAME "_texupscale",
       "Texture Upscaling (xBRZ)",
-      "",
+      "Enhance hand-drawn 2D pixel art graphics. Should only be used with 2D pixelized games.",
       {
          { "off", "disabled" },
          { "2x",  NULL },
@@ -618,11 +618,7 @@ struct retro_core_option_definition option_defs_us[] = {
          { "enabled",  NULL },
          { NULL, NULL },
       },
-#if defined(ANDROID) || defined(IOS) || defined(THREADED_RENDERING_DEFAULT)
       "enabled",
-#else
-      "disabled",
-#endif
    },
    {
       CORE_OPTION_NAME "_synchronous_rendering",
@@ -633,7 +629,11 @@ struct retro_core_option_definition option_defs_us[] = {
          { "enabled",  NULL },
          { NULL, NULL },
       },
+#ifdef LOW_END
       "disabled",
+#else
+      "enabled",
+#endif
    },
    {
       CORE_OPTION_NAME "_delay_frame_swapping",

jni/Android.mk

@@ -17,13 +17,11 @@ NO_THREADS    := 0
 HAVE_NEON     := 0
 WITH_DYNAREC  :=
 HAVE_CHD      := 1
-THREADED_RENDERING_DEFAULT := 1
 
 HAVE_GL       := 1
 HAVE_OPENGL   := 1
 HAVE_VULKAN   := 1
 GLES          := 1
-THREADED_RENDERING_DEFAULT := 1
 HAVE_MODEM    := 1
 
 HOST_CPU_X86=0x20000001