Libretro rewrite (#3212)

* redo all the libretro stuff in pure C#

also yes i imported snprintf lol

* also remove these

* remove clib hack, it doesn't work when there's more than 1 param (apparently ... is really just a variable num of args passed on the stack and not some pointer to some struct, and c# doesn't have any way of representing this. fallback log isn't bad to deal with anyways)

* also probably want this to return false

* /s/UnmanagedString/PinnedString/

* misc tweaks

* oops

* Libretro "Bridge", with entirely different design. The bridge here simply handles all the callbacks retro cores use, so there is never a c++ -> .NET callback, and probably avoids any libco issues
also a lot of cleanup in various areas, and some bug fixes too (Blit555 now outputs the correct colors)

* use blipbuffer instead of speex

speex seems to perform much worse often (and outright buggy for some libretro cores like sameboy which reports a sample rate of 384000), and blip works well enough even for "newer" systems

* cleanup and linux build

* cleanup and bugfixes (thanks uninitalized variables)

* oops

* misc and cleanup

* fix load no game, also handle load game failures correctly

Author: CasualPokePlayer

Assets/dll/LibretroBridge.dll

@@ -0,0 +1,350 @@
+#include <cstdint>
+#include <climits>
+
+typedef std::int8_t s8;
+typedef std::int16_t s16;
+typedef std::int32_t s32;
+typedef std::int64_t s64;
+
+typedef std::uint8_t u8;
+typedef std::uint16_t u16;
+typedef std::uint32_t u32;
+typedef std::uint64_t u64;
+
+typedef u8 boolean;
+
+#define EXPORT extern "C" __attribute__((visibility("default")))
+
+enum class RETRO_ENVIRONMENT {
+	EXPERIMENTAL = 0x10000,
+	SET_ROTATION = 1,
+	GET_OVERSCAN = 2,
+	GET_CAN_DUPE = 3,
+	SET_MESSAGE = 6,
+	SHUTDOWN = 7,
+	SET_PERFORMANCE_LEVEL = 8,
+	GET_SYSTEM_DIRECTORY = 9,
+	SET_PIXEL_FORMAT = 10,
+	SET_INPUT_DESCRIPTORS = 11,
+	SET_KEYBOARD_CALLBACK = 12,
+	SET_DISK_CONTROL_INTERFACE = 13,
+	SET_HW_RENDER = 14,
+	GET_VARIABLE = 15,
+	SET_VARIABLES = 16,
+	GET_VARIABLE_UPDATE = 17,
+	SET_SUPPORT_NO_GAME = 18,
+	GET_LIBRETRO_PATH = 19,
+	SET_AUDIO_CALLBACK = 22,
+	SET_FRAME_TIME_CALLBACK = 21,
+	GET_RUMBLE_INTERFACE = 23,
+	GET_INPUT_DEVICE_CAPABILITIES = 24,
+	GET_SENSOR_INTERFACE = 25 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	GET_CAMERA_INTERFACE = 26 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	GET_LOG_INTERFACE = 27,
+	GET_PERF_INTERFACE = 28,
+	GET_LOCATION_INTERFACE = 29,
+	GET_CONTENT_DIRECTORY = 30,
+	GET_CORE_ASSETS_DIRECTORY = 30,
+	GET_SAVE_DIRECTORY = 31,
+	SET_SYSTEM_AV_INFO = 32,
+	SET_PROC_ADDRESS_CALLBACK = 33,
+	SET_SUBSYSTEM_INFO = 34,
+	SET_CONTROLLER_INFO = 35,
+	SET_MEMORY_MAPS = 36 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	SET_GEOMETRY = 37,
+	GET_USERNAME = 38,
+	GET_LANGUAGE = 39,
+	GET_CURRENT_SOFTWARE_FRAMEBUFFER = 40 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	GET_HW_RENDER_INTERFACE = 41 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	SET_SUPPORT_ACHIEVEMENTS = 42 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	SET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE = 43 | RETRO_ENVIRONMENT::EXPERIMENTAL,
+	SET_SERIALIZATION_QUIRKS = 44,
+};
+
+enum class RETRO_DEVICE {
+	NONE = 0,
+	JOYPAD = 1,
+	MOUSE = 2,
+	KEYBOARD = 3,
+	LIGHTGUN = 4,
+	ANALOG = 5,
+	POINTER = 6,
+	SENSOR_ACCELEROMETER = 7,
+
+	LAST,
+};
+
+enum class RETRO_DEVICE_ID_ANALOG {
+	X = 0,
+	Y = 1,
+
+	LAST,
+};
+
+enum class RETRO_DEVICE_ID_MOUSE {
+	X = 0,
+	Y = 1,
+	LEFT = 2,
+	RIGHT = 3,
+
+	LAST,
+};
+
+enum class RETRO_DEVICE_ID_LIGHTGUN {
+	X = 0,
+	Y = 1,
+	TRIGGER = 2,
+	CURSOR = 3,
+	TURBO = 4,
+	PAUSE = 5,
+	START = 6,
+
+	LAST,
+};
+
+enum class RETRO_DEVICE_ID_POINTER {
+	X = 0,
+	Y = 1,
+	PRESSED = 2,
+
+	LAST,
+};
+
+enum class RETRO_KEY {
+	UNKNOWN = 0,
+	FIRST = 0,
+	BACKSPACE = 8,
+	TAB = 9,
+	CLEAR = 12,
+	RETURN = 13,
+	PAUSE = 19,
+	ESCAPE = 27,
+	SPACE = 32,
+	EXCLAIM = 33,
+	QUOTEDBL = 34,
+	HASH = 35,
+	DOLLAR = 36,
+	AMPERSAND = 38,
+	QUOTE = 39,
+	LEFTPAREN = 40,
+	RIGHTPAREN = 41,
+	ASTERISK = 42,
+	PLUS = 43,
+	COMMA = 44,
+	MINUS = 45,
+	PERIOD = 46,
+	SLASH = 47,
+	_0 = 48,
+	_1 = 49,
+	_2 = 50,
+	_3 = 51,
+	_4 = 52,
+	_5 = 53,
+	_6 = 54,
+	_7 = 55,
+	_8 = 56,
+	_9 = 57,
+	COLON = 58,
+	SEMICOLON = 59,
+	LESS = 60,
+	EQUALS = 61,
+	GREATER = 62,
+	QUESTION = 63,
+	AT = 64,
+	LEFTBRACKET = 91,
+	BACKSLASH = 92,
+	RIGHTBRACKET = 93,
+	CARET = 94,
+	UNDERSCORE = 95,
+	BACKQUOTE = 96,
+	a = 97,
+	b = 98,
+	c = 99,
+	d = 100,
+	e = 101,
+	f = 102,
+	g = 103,
+	h = 104,
+	i = 105,
+	j = 106,
+	k = 107,
+	l = 108,
+	m = 109,
+	n = 110,
+	o = 111,
+	p = 112,
+	q = 113,
+	r = 114,
+	s = 115,
+	t = 116,
+	u = 117,
+	v = 118,
+	w = 119,
+	x = 120,
+	y = 121,
+	z = 122,
+	DELETE = 127,
+
+	KP0 = 256,
+	KP1 = 257,
+	KP2 = 258,
+	KP3 = 259,
+	KP4 = 260,
+	KP5 = 261,
+	KP6 = 262,
+	KP7 = 263,
+	KP8 = 264,
+	KP9 = 265,
+	KP_PERIOD = 266,
+	KP_DIVIDE = 267,
+	KP_MULTIPLY = 268,
+	KP_MINUS = 269,
+	KP_PLUS = 270,
+	KP_ENTER = 271,
+	KP_EQUALS = 272,
+
+	UP = 273,
+	DOWN = 274,
+	RIGHT = 275,
+	LEFT = 276,
+	INSERT = 277,
+	HOME = 278,
+	END = 279,
+	PAGEUP = 280,
+	PAGEDOWN = 281,
+
+	F1 = 282,
+	F2 = 283,
+	F3 = 284,
+	F4 = 285,
+	F5 = 286,
+	F6 = 287,
+	F7 = 288,
+	F8 = 289,
+	F9 = 290,
+	F10 = 291,
+	F11 = 292,
+	F12 = 293,
+	F13 = 294,
+	F14 = 295,
+	F15 = 296,
+
+	NUMLOCK = 300,
+	CAPSLOCK = 301,
+	SCROLLOCK = 302,
+	RSHIFT = 303,
+	LSHIFT = 304,
+	RCTRL = 305,
+	LCTRL = 306,
+	RALT = 307,
+	LALT = 308,
+	RMETA = 309,
+	LMETA = 310,
+	LSUPER = 311,
+	RSUPER = 312,
+	MODE = 313,
+	COMPOSE = 314,
+
+	HELP = 315,
+	PRINT = 316,
+	SYSREQ = 317,
+	BREAK = 318,
+	MENU = 319,
+	POWER = 320,
+	EURO = 321,
+	UNDO = 322,
+
+	LAST,
+};
+
+enum class RETRO_MOD {
+	NONE = 0,
+	SHIFT = 1,
+	CTRL = 2,
+	ALT = 4,
+	META = 8,
+	NUMLOCK = 16,
+	CAPSLOCK = 32,
+	SCROLLLOCK = 64,
+};
+
+enum class RETRO_DEVICE_ID_SENSOR_ACCELEROMETER {
+	X = 0,
+	Y = 1,
+	Z = 2,
+
+	LAST,
+};
+
+enum class RETRO_DEVICE_ID_JOYPAD {
+	B = 0,
+	Y = 1,
+	SELECT = 2,
+	START = 3,
+	UP = 4,
+	DOWN = 5,
+	LEFT = 6,
+	RIGHT = 7,
+	A = 8,
+	X = 9,
+	L = 10,
+	R = 11,
+	L2 = 12,
+	R2 = 13,
+	L3 = 14,
+	R3 = 15,
+
+	LAST,
+};
+
+enum class RETRO_PIXEL_FORMAT {
+	ZRGB1555 = 0,
+	XRGB8888 = 1,
+	RGB565 = 2,
+	UNKNOWN = INT_MAX,
+};
+
+enum class RETRO_LANGUAGE {
+	ENGLISH = 0,
+	JAPANESE = 1,
+	FRENCH = 2,
+	SPANISH = 3,
+	GERMAN = 4,
+	ITALIAN = 5,
+	DUTCH = 6,
+	PORTUGUESE = 7,
+	RUSSIAN = 8,
+	KOREAN = 9,
+	CHINESE_TRADITIONAL = 10,
+	CHINESE_SIMPLIFIED = 11,
+	ESPERANTO = 12,
+	POLISH = 13,
+	VIETNAMESE = 14,
+	LAST,
+
+	DUMMY = INT_MAX,
+};
+
+enum class RETRO_LOG {
+	DEBUG = 0,
+	INFO,
+	WARN,
+	ERROR,
+	DUMMY = INT_MAX,
+};
+
+struct retro_variable {
+	const char* key;
+	const char* value;
+};
+
+struct retro_message {
+	const char* msg;
+	u32 frames;
+};
+
+typedef void (*retro_log_printf_t)(RETRO_LOG level, const char* fmt, ...);
+
+struct retro_log_callback {
+	retro_log_printf_t log;
+};

Assets/dll/LibretroBridge.so

@@ -0,0 +1,17 @@
+CXX = g++
+
+CFLAGS = -Wall -Wextra -Wpedantic -std=c++11 -O3 -fPIC -fvisibility=hidden -fomit-frame-pointer -fno-exceptions
+LFLAGS = -shared
+
+SRCS = LibretroBridge.cpp
+
+ifeq ($(OS),Windows_NT)
+	TARGET = ../Assets/dll/libLibretroBridge.dll
+else
+	TARGET = ../Assets/dll/libLibretroBridge.so
+endif
+
+all: libLibretroBridge
+
+libLibretroBridge: $(SRCS)
+	$(CXX) $(CFLAGS) $(SRCS) -o $(TARGET) $(LFLAGS)