1 files changed, 310 insertions, 0 deletions
diff --git a/src/input_common/gcadapter/gc_poller.cpp b/src/input_common/gcadapter/gc_poller.cpp
new file mode 100644
index 0000000000..772bd88904
--- /dev/null
+++ b/src/input_common/gcadapter/gc_poller.cpp
@@ -0,0 +1,310 @@
+#include <atomic>
+#include <list>
+#include <mutex>
+#include <utility>
+#include "input_common/gcadapter/gc_poller.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "common/threadsafe_queue.h"
+
+// Using extern as to avoid multply defined symbols.
+extern Common::SPSCQueue<GCPadStatus> pad_queue[4];
+extern struct GCState state[4];
+
+namespace InputCommon {
+
+class GCButton final : public Input::ButtonDevice {
+public:
+    explicit GCButton(int port_, int button_, int axis_)
+        : port(port_), button(button_) {
+    }
+
+    ~GCButton() override;
+
+    bool GetStatus() const override {
+        return state[port].buttons.at(button);
+    }
+
+private:
+    const int port;
+    const int button;
+};
+
+class GCAxisButton final : public Input::ButtonDevice {
+public:
+    explicit GCAxisButton(int port_, int axis_, float threshold_,
+                          bool trigger_if_greater_)
+        : port(port_), axis(axis_), threshold(threshold_),
+          trigger_if_greater(trigger_if_greater_) {
+    }
+
+
+    bool GetStatus() const override {
+        const float axis_value = (state[port].axes.at(axis) - 128.0f) / 128.0f;
+        if (trigger_if_greater) {
+            return axis_value > 0.10f; //TODO(ameerj) : Fix threshold.
+        }
+        return axis_value < -0.10f;
+    }
+
+private:
+    const int port;
+    const int axis;
+    float threshold;
+    bool trigger_if_greater;
+};
+
+GCButtonFactory::GCButtonFactory() {
+    GCAdapter::Init();
+}
+
+GCButton::~GCButton() {
+    GCAdapter::Shutdown();
+}
+
+std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::ParamPackage& params) {
+    int button_id = params.Get("button", 0);
+    int port = params.Get("port", 0);
+    // For Axis buttons, used by the binary sticks.
+    if (params.Has("axis")) {
+        const int axis = params.Get("axis", 0);
+        const float threshold = params.Get("threshold", 0.5f);
+        const std::string direction_name = params.Get("direction", "");
+        bool trigger_if_greater;
+        if (direction_name == "+") {
+            trigger_if_greater = true;
+        } else if (direction_name == "-") {
+            trigger_if_greater = false;
+        } else {
+            trigger_if_greater = true;
+            LOG_ERROR(Input, "Unknown direction {}", direction_name);
+        }
+        return std::make_unique<GCAxisButton>(port, axis, threshold, trigger_if_greater);
+    }
+
+    std::unique_ptr<GCButton> button =
+        std::make_unique<GCButton>(port, button_id, params.Get("axis", 0));
+    return std::move(button);
+}
+
+Common::ParamPackage GCButtonFactory::GetNextInput() {
+    Common::ParamPackage params;
+    GCPadStatus pad;
+    for (int i = 0; i < 4; i++) {
+        while (pad_queue[i].Pop(pad)) {
+            // This while loop will break on the earliest detected button
+            params.Set("engine", "gcpad");
+            params.Set("port", i);
+            // I was debating whether to keep these verbose for ease of reading
+            // or to use a while loop shifting the bits to test and set the value.
+            if (pad.button & PAD_BUTTON_A) {
+                params.Set("button", PAD_BUTTON_A);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_B) {
+                params.Set("button", PAD_BUTTON_B);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_X) {
+                params.Set("button", PAD_BUTTON_X);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_Y) {
+                params.Set("button", PAD_BUTTON_Y);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_DOWN) {
+                params.Set("button", PAD_BUTTON_DOWN);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_LEFT) {
+                params.Set("button", PAD_BUTTON_LEFT);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_RIGHT) {
+                params.Set("button", PAD_BUTTON_RIGHT);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_UP) {
+                params.Set("button", PAD_BUTTON_UP);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_L) {
+                params.Set("button", PAD_TRIGGER_L);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_R) {
+                params.Set("button", PAD_TRIGGER_R);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_Z) {
+                params.Set("button", PAD_TRIGGER_Z);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_START) {
+                params.Set("button", PAD_BUTTON_START);
+                break;
+            }
+            // For Axis button implementation
+            if (pad.axis_which != 255) {
+                params.Set("axis", pad.axis_which);
+                params.Set("button", PAD_STICK);
+                if (pad.axis_value > 128) {
+                    params.Set("direction", "+");
+                    params.Set("threshold", "0.5");
+                } else {
+                    params.Set("direction", "-");
+                    params.Set("threshold", "-0.5");
+                }
+                break;
+            }
+        }
+    }
+    return params;
+}
+
+void GCButtonFactory::BeginConfiguration() {
+    polling = true;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::BeginConfiguration();
+}
+
+void GCButtonFactory::EndConfiguration() {
+    polling = false;
+
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::EndConfiguration();
+}
+
+class GCAnalog final : public Input::AnalogDevice {
+public:
+    GCAnalog(int port_, int axis_x_, int axis_y_, float deadzone_)
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_) {
+    }
+
+    float GetAxis(int axis) const {
+        std::lock_guard lock{mutex};
+        // division is not by a perfect 128 to account for some variance in center location
+        // e.g. my device idled at 131 in X, 120 in Y, and full range of motion was in range [20-230]
+        return (state[port].axes.at(axis) - 128.0f) / 95.0f;
+    }
+
+    std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
+        float x = GetAxis(axis_x);
+        float y = GetAxis(axis_y);
+
+        // 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);
+    }
+
+    std::tuple<float, float> GetStatus() const override {
+        const auto [x, y] = GetAnalog(axis_x, axis_y);
+        const float r = std::sqrt((x * x) + (y * y));
+        if (r > deadzone) {
+            return std::make_tuple(x / r * (r - deadzone) / (1 - deadzone),
+                                   y / r * (r - deadzone) / (1 - deadzone));
+        }
+        return std::make_tuple<float, float>(0.0f, 0.0f);
+    }
+
+    bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
+        const auto [x, y] = GetStatus();
+        const float directional_deadzone = 0.4f;
+        switch (direction) {
+        case Input::AnalogDirection::RIGHT:
+            return x > directional_deadzone;
+        case Input::AnalogDirection::LEFT:
+            return x < -directional_deadzone;
+        case Input::AnalogDirection::UP:
+            return y > directional_deadzone;
+        case Input::AnalogDirection::DOWN:
+            return y < -directional_deadzone;
+        }
+        return false;
+    }
+
+private:
+    const int port;
+    const int axis_x;
+    const int axis_y;
+    const float deadzone;
+    mutable std::mutex mutex;
+};
+
+
+/// An analog device factory that creates analog devices from GC Adapter
+GCAnalogFactory::GCAnalogFactory() {};
+
+
+/**
+* Creates analog device from joystick axes
+* @param params contains parameters for creating the device:
+*     - "port": the nth gcpad on the adapter
+*     - "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> GCAnalogFactory::Create(const Common::ParamPackage& params) {
+    const std::string guid = params.Get("guid", "0");
+    const int port = params.Get("port", 0);
+    const int axis_x = params.Get("axis_x", 0);
+    const int axis_y = params.Get("axis_y", 1);
+    const float deadzone = std::clamp(params.Get("deadzone", 0.0f), 0.0f, .99f);
+
+    return std::make_unique<GCAnalog>(port, axis_x, axis_y, deadzone);
+}
+
+void GCAnalogFactory::BeginConfiguration() {
+    polling = true;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::BeginConfiguration();
+}
+
+void GCAnalogFactory::EndConfiguration() {
+    polling = false;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::EndConfiguration();
+}
+
+Common::ParamPackage GCAnalogFactory::GetNextInput() {
+    GCPadStatus pad;
+    for (int i = 0; i < 4; i++) {
+        while (pad_queue[i].Pop(pad)) {
+            if (pad.axis_which == 255 || std::abs((pad.axis_value - 128.0f) / 128.0f) < 0.1) {
+                continue;
+            }
+            // An analog device needs two axes, so we need to store the axis for later and wait for
+            // a second SDL event. The axes also must be from the same joystick.
+            const int axis = pad.axis_which;
+            if (analog_x_axis == -1) {
+                analog_x_axis = axis;
+                controller_number = i;
+            } else if (analog_y_axis == -1 && analog_x_axis != axis && controller_number == i) {
+                analog_y_axis = axis;
+            }
+        }
+    }
+    Common::ParamPackage params;
+    if (analog_x_axis != -1 && analog_y_axis != -1) {
+        params.Set("engine", "gcpad");
+        params.Set("port", controller_number);
+        params.Set("axis_x", analog_x_axis);
+        params.Set("axis_y", analog_y_axis);
+        analog_x_axis = -1;
+        analog_y_axis = -1;
+        controller_number = -1;
+        return params;
+    }
+    return params;
+}
+} // namespace InputCommon