InputCommon: add AnalogFromButton

1 files changed, 58 insertions, 0 deletions

diff --git a/src/input_common/analog_from_button.cpp b/src/input_common/analog_from_button.cpp
new file mode 100755
index 000000000..e1a260762
--- /dev/null
+++ b/src/input_common/analog_from_button.cpp
@@ -0,0 +1,58 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "input_common/analog_from_button.h"
+
+namespace InputCommon {
+
+class Analog final : public Input::AnalogDevice {
+public:
+    using Button = std::unique_ptr<Input::ButtonDevice>;
+
+    Analog(Button up_, Button down_, Button left_, Button right_, Button modifier_,
+           float modifier_scale_)
+        : up(std::move(up_)), down(std::move(down_)), left(std::move(left_)),
+          right(std::move(right_)), modifier(std::move(modifier_)),
+          modifier_scale(modifier_scale_) {}
+
+    std::tuple<float, float> GetStatus() const override {
+        constexpr float SQRT_HALF = 0.707106781f;
+        int x = 0, y = 0;
+
+        if (right->GetStatus())
+            ++x;
+        if (left->GetStatus())
+            --x;
+        if (up->GetStatus())
+            ++y;
+        if (down->GetStatus())
+            --y;
+
+        float coef = modifier->GetStatus() ? modifier_scale : 1.0f;
+        return std::make_tuple(x * coef * (y == 0 ? 1.0f : SQRT_HALF),
+                               y * coef * (x == 0 ? 1.0f : SQRT_HALF));
+    }
+
+private:
+    Button up;
+    Button down;
+    Button left;
+    Button right;
+    Button modifier;
+    float modifier_scale;
+};
+
+std::unique_ptr<Input::AnalogDevice> AnalogFromButton::Create(const Common::ParamPackage& params) {
+    const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
+    auto up = Input::CreateDevice<Input::ButtonDevice>(params.Get("up", null_engine));
+    auto down = Input::CreateDevice<Input::ButtonDevice>(params.Get("down", null_engine));
+    auto left = Input::CreateDevice<Input::ButtonDevice>(params.Get("left", null_engine));
+    auto right = Input::CreateDevice<Input::ButtonDevice>(params.Get("right", null_engine));
+    auto modifier = Input::CreateDevice<Input::ButtonDevice>(params.Get("modifier", null_engine));
+    auto modifier_scale = params.Get("modifier_scale", 0.5f);
+    return std::make_unique<Analog>(std::move(up), std::move(down), std::move(left),
+                                    std::move(right), std::move(modifier), modifier_scale);
+}
+
+} // namespace InputCommon