From 51b1c1f211bf8112eba845256bd52cbd36a5932a Mon Sep 17 00:00:00 2001
From: wwylele <wwylele@gmail.com>
Date: Sat, 21 Jan 2017 17:33:48 +0200
Subject: [PATCH] InputCommon: add SDL joystick support
---
src/input_common/CMakeLists.txt | 10 ++
src/input_common/main.cpp | 10 ++
src/input_common/sdl/sdl.cpp | 202 ++++++++++++++++++++++++++++++++
src/input_common/sdl/sdl.h | 19 +++
4 files changed, 241 insertions(+)
create mode 100644 src/input_common/sdl/sdl.cpp
create mode 100644 src/input_common/sdl/sdl.h
diff --git a/src/input_common/CMakeLists.txt b/src/input_common/CMakeLists.txt
index 9f4422269..cfe5caaa3 100644
--- a/src/input_common/CMakeLists.txt
+++ b/src/input_common/CMakeLists.txt
@@ -10,8 +10,18 @@ set(HEADERS
main.h
)
+if(SDL2_FOUND)
+ set(SRCS ${SRCS} sdl/sdl.cpp)
+ set(HEADERS ${HEADERS} sdl/sdl.h)
+ include_directories(${SDL2_INCLUDE_DIR})
+endif()
+
create_directory_groups(${SRCS} ${HEADERS})
add_library(input_common STATIC ${SRCS} ${HEADERS})
target_link_libraries(input_common common core)
+if(SDL2_FOUND)
+ target_link_libraries(input_common ${SDL2_LIBRARY})
+ set_property(TARGET input_common APPEND PROPERTY COMPILE_DEFINITIONS HAVE_SDL2)
+endif()
diff --git a/src/input_common/main.cpp b/src/input_common/main.cpp
index 8455fdc17..699f41e6b 100644
--- a/src/input_common/main.cpp
+++ b/src/input_common/main.cpp
@@ -7,6 +7,9 @@
#include "input_common/analog_from_button.h"
#include "input_common/keyboard.h"
#include "input_common/main.h"
+#ifdef HAVE_SDL2
+#include "input_common/sdl/sdl.h"
+#endif
namespace InputCommon {
@@ -17,12 +20,19 @@ void Init() {
Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
Input::RegisterFactory<Input::AnalogDevice>("analog_from_button",
std::make_shared<InputCommon::AnalogFromButton>());
+#ifdef HAVE_SDL2
+ SDL::Init();
+#endif
}
void Shutdown() {
Input::UnregisterFactory<Input::ButtonDevice>("keyboard");
keyboard.reset();
Input::UnregisterFactory<Input::AnalogDevice>("analog_from_button");
+
+#ifdef HAVE_SDL2
+ SDL::Shutdown();
+#endif
}
Keyboard* GetKeyboard() {
diff --git a/src/input_common/sdl/sdl.cpp b/src/input_common/sdl/sdl.cpp
new file mode 100644
index 000000000..ae0206909
--- /dev/null
+++ b/src/input_common/sdl/sdl.cpp
@@ -0,0 +1,202 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cmath>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <unordered_map>
+#include <SDL.h>
+#include "common/math_util.h"
+#include "input_common/sdl/sdl.h"
+
+namespace InputCommon {
+
+namespace SDL {
+
+class SDLJoystick;
+class SDLButtonFactory;
+class SDLAnalogFactory;
+static std::unordered_map<int, std::weak_ptr<SDLJoystick>> joystick_list;
+static std::shared_ptr<SDLButtonFactory> button_factory;
+static std::shared_ptr<SDLAnalogFactory> analog_factory;
+
+static bool initialized = false;
+
+class SDLJoystick {
+public:
+ explicit SDLJoystick(int joystick_index)
+ : joystick{SDL_JoystickOpen(joystick_index), SDL_JoystickClose} {
+ if (!joystick) {
+ LOG_ERROR(Input, "failed to open joystick %d", joystick_index);
+ }
+ }
+
+ bool GetButton(int button) const {
+ if (!joystick)
+ return {};
+ SDL_JoystickUpdate();
+ return SDL_JoystickGetButton(joystick.get(), button) == 1;
+ }
+
+ std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
+ if (!joystick)
+ return {};
+ SDL_JoystickUpdate();
+ float x = SDL_JoystickGetAxis(joystick.get(), axis_x) / 32767.0f;
+ float y = SDL_JoystickGetAxis(joystick.get(), axis_y) / 32767.0f;
+ y = -y; // 3DS uses an y-axis inverse from SDL
+
+ // Make sure the coordinates are in the unit circle,
+ // otherwise normalize it.
+ float r = x * x + y * y;
+ if (r > 1.0f) {
+ r = std::sqrt(r);
+ x /= r;
+ y /= r;
+ }
+
+ return std::make_tuple(x, y);
+ }
+
+ bool GetHatDirection(int hat, Uint8 direction) const {
+ return (SDL_JoystickGetHat(joystick.get(), hat) & direction) != 0;
+ }
+
+private:
+ std::unique_ptr<SDL_Joystick, decltype(&SDL_JoystickClose)> joystick;
+};
+
+class SDLButton final : public Input::ButtonDevice {
+public:
+ explicit SDLButton(std::shared_ptr<SDLJoystick> joystick_, int button_)
+ : joystick(joystick_), button(button_) {}
+
+ bool GetStatus() const override {
+ return joystick->GetButton(button);
+ }
+
+private:
+ std::shared_ptr<SDLJoystick> joystick;
+ int button;
+};
+
+class SDLDirectionButton final : public Input::ButtonDevice {
+public:
+ explicit SDLDirectionButton(std::shared_ptr<SDLJoystick> joystick_, int hat_, Uint8 direction_)
+ : joystick(joystick_), hat(hat_), direction(direction_) {}
+
+ bool GetStatus() const override {
+ return joystick->GetHatDirection(hat, direction);
+ }
+
+private:
+ std::shared_ptr<SDLJoystick> joystick;
+ int hat;
+ Uint8 direction;
+};
+
+class SDLAnalog final : public Input::AnalogDevice {
+public:
+ SDLAnalog(std::shared_ptr<SDLJoystick> joystick_, int axis_x_, int axis_y_)
+ : joystick(joystick_), axis_x(axis_x_), axis_y(axis_y_) {}
+
+ std::tuple<float, float> GetStatus() const override {
+ return joystick->GetAnalog(axis_x, axis_y);
+ }
+
+private:
+ std::shared_ptr<SDLJoystick> joystick;
+ int axis_x;
+ int axis_y;
+};
+
+static std::shared_ptr<SDLJoystick> GetJoystick(int joystick_index) {
+ std::shared_ptr<SDLJoystick> joystick = joystick_list[joystick_index].lock();
+ if (!joystick) {
+ joystick = std::make_shared<SDLJoystick>(joystick_index);
+ joystick_list[joystick_index] = joystick;
+ }
+ return joystick;
+}
+
+/// A button device factory that creates button devices from SDL joystick
+class SDLButtonFactory final : public Input::Factory<Input::ButtonDevice> {
+public:
+ /**
+ * Creates a button device from a joystick button
+ * @param params contains parameters for creating the device:
+ * - "joystick": the index of the joystick to bind
+ * - "button"(optional): the index of the button to bind
+ * - "hat"(optional): the index of the hat to bind as direction buttons
+ * - "direction"(only used for hat): the direction name of the hat to bind. Can be "up",
+ * "down", "left" or "right"
+ */
+ std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override {
+ const int joystick_index = params.Get("joystick", 0);
+
+ if (params.Has("hat")) {
+ const int hat = params.Get("hat", 0);
+ const std::string direction_name = params.Get("direction", "");
+ Uint8 direction;
+ if (direction_name == "up") {
+ direction = SDL_HAT_UP;
+ } else if (direction_name == "down") {
+ direction = SDL_HAT_DOWN;
+ } else if (direction_name == "left") {
+ direction = SDL_HAT_LEFT;
+ } else if (direction_name == "right") {
+ direction = SDL_HAT_RIGHT;
+ } else {
+ direction = 0;
+ }
+ return std::make_unique<SDLDirectionButton>(GetJoystick(joystick_index), hat,
+ direction);
+ }
+
+ const int button = params.Get("button", 0);
+ return std::make_unique<SDLButton>(GetJoystick(joystick_index), button);
+ }
+};
+
+/// An analog device factory that creates analog devices from SDL joystick
+class SDLAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
+public:
+ /**
+ * Creates analog device from joystick axes
+ * @param params contains parameters for creating the device:
+ * - "joystick": the index of the joystick to bind
+ * - "axis_x": the index of the axis to be bind as x-axis
+ * - "axis_y": the index of the axis to be bind as y-axis
+ */
+ std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override {
+ const int joystick_index = params.Get("joystick", 0);
+ const int axis_x = params.Get("axis_x", 0);
+ const int axis_y = params.Get("axis_y", 1);
+ return std::make_unique<SDLAnalog>(GetJoystick(joystick_index), axis_x, axis_y);
+ }
+};
+
+void Init() {
+ if (SDL_Init(SDL_INIT_JOYSTICK) < 0) {
+ LOG_CRITICAL(Input, "SDL_Init(SDL_INIT_JOYSTICK) failed with: %s", SDL_GetError());
+ } else {
+ using namespace Input;
+ RegisterFactory<ButtonDevice>("sdl", std::make_shared<SDLButtonFactory>());
+ RegisterFactory<AnalogDevice>("sdl", std::make_shared<SDLAnalogFactory>());
+ initialized = true;
+ }
+}
+
+void Shutdown() {
+ if (initialized) {
+ using namespace Input;
+ UnregisterFactory<ButtonDevice>("sdl");
+ UnregisterFactory<AnalogDevice>("sdl");
+ SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
+ }
+}
+
+} // namespace SDL
+} // namespace InputCommon
diff --git a/src/input_common/sdl/sdl.h b/src/input_common/sdl/sdl.h
new file mode 100644
index 000000000..3e72debcc
--- /dev/null
+++ b/src/input_common/sdl/sdl.h
@@ -0,0 +1,19 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+namespace SDL {
+
+/// Initializes and registers SDL device factories
+void Init();
+
+/// Unresisters SDL device factories and shut them down.
+void Shutdown();
+
+} // namespace SDL
+} // namespace InputCommon