1 files changed, 70 insertions, 0 deletions

diff --git a/src/input_common/helpers/touch_from_buttons.cpp b/src/input_common/helpers/touch_from_buttons.cpp
new file mode 100644
index 000000000..2abfaf841
--- /dev/null
+++ b/src/input_common/helpers/touch_from_buttons.cpp
@@ -0,0 +1,70 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include "common/settings.h"
+#include "core/frontend/framebuffer_layout.h"
+#include "input_common/helpers/touch_from_buttons.h"
+
+namespace InputCommon {
+
+class TouchFromButtonDevice final : public Input::InputDevice {
+public:
+    using Button = std::unique_ptr<Input::InputDevice>;
+    TouchFromButtonDevice(Button button_, u32 touch_id_, float x_, float y_)
+        : button(std::move(button_)), touch_id(touch_id_), x(x_), y(y_) {
+        Input::InputCallback button_up_callback{
+            [this](Input::CallbackStatus callback_) { UpdateButtonStatus(callback_); }};
+        button->SetCallback(button_up_callback);
+    }
+
+    Input::TouchStatus GetStatus(bool pressed) const {
+        const Input::ButtonStatus button_status{
+            .value = pressed,
+        };
+        Input::TouchStatus status{
+            .pressed = button_status,
+            .x = {},
+            .y = {},
+            .id = touch_id,
+        };
+        status.x.properties = properties;
+        status.y.properties = properties;
+
+        if (!pressed) {
+            return status;
+        }
+
+        status.x.raw_value = x;
+        status.y.raw_value = y;
+        return status;
+    }
+
+    void UpdateButtonStatus(Input::CallbackStatus button_callback) {
+        const Input::CallbackStatus status{
+            .type = Input::InputType::Touch,
+            .touch_status = GetStatus(button_callback.button_status.value),
+        };
+        TriggerOnChange(status);
+    }
+
+private:
+    Button button;
+    const u32 touch_id;
+    const float x;
+    const float y;
+    const Input::AnalogProperties properties{0.0f, 1.0f, 0.5f, 0.0f, false};
+};
+
+std::unique_ptr<Input::InputDevice> TouchFromButton::Create(const Common::ParamPackage& params) {
+    const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
+    auto button =
+        Input::CreateDeviceFromString<Input::InputDevice>(params.Get("button", null_engine));
+    const auto touch_id = params.Get("touch_id", 0);
+    const float x = params.Get("x", 0.0f) / 1280.0f;
+    const float y = params.Get("y", 0.0f) / 720.0f;
+    return std::make_unique<TouchFromButtonDevice>(std::move(button), touch_id, x, y);
+}
+
+} // namespace InputCommon