1 files changed, 84 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..ece1e3b32
--- /dev/null
+++ b/src/input_common/helpers/touch_from_buttons.cpp
@@ -0,0 +1,84 @@
+// 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 Common::Input::InputDevice {
+public:
+    using Button = std::unique_ptr<Common::Input::InputDevice>;
+    TouchFromButtonDevice(Button button_, int touch_id_, float x_, float y_)
+        : button(std::move(button_)), touch_id(touch_id_), x(x_), y(y_) {
+        last_button_value = false;
+        button->SetCallback({
+            .on_change =
+                [this](const Common::Input::CallbackStatus& callback_) {
+                    UpdateButtonStatus(callback_);
+                },
+        });
+        button->ForceUpdate();
+    }
+
+    void ForceUpdate() override {
+        button->ForceUpdate();
+    }
+
+    Common::Input::TouchStatus GetStatus(bool pressed) const {
+        const Common::Input::ButtonStatus button_status{
+            .value = pressed,
+        };
+        Common::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(const Common::Input::CallbackStatus& button_callback) {
+        const Common::Input::CallbackStatus status{
+            .type = Common::Input::InputType::Touch,
+            .touch_status = GetStatus(button_callback.button_status.value),
+        };
+        if (last_button_value != button_callback.button_status.value) {
+            last_button_value = button_callback.button_status.value;
+            TriggerOnChange(status);
+        }
+    }
+
+private:
+    Button button;
+    bool last_button_value;
+    const int touch_id;
+    const float x;
+    const float y;
+    const Common::Input::AnalogProperties properties{0.0f, 1.0f, 0.5f, 0.0f, false};
+};
+
+std::unique_ptr<Common::Input::InputDevice> TouchFromButton::Create(
+    const Common::ParamPackage& params) {
+    const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
+    auto button = Common::Input::CreateDeviceFromString<Common::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