New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/drape_frontend/frame_values.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "drape/glsl_types.hpp"
+
+#include "base/assert.hpp"
+
+#include <type_traits>
+#include <utility>
+
+namespace df
+{
+#define DECLARE_SETTER(name, field) \
+template<typename T> struct Check##name \
+{ \
+private: \
+  static void Detect(...); \
+  template<typename U> static decltype(std::declval<U>().field) Detect(U const &); \
+public: \
+  static constexpr bool Value = !std::is_same<void, decltype(Detect(std::declval<T>()))>::value; \
+}; \
+template <typename ParamsType> \
+std::enable_if_t<Check##name<ParamsType>::Value> \
+name(ParamsType & params) const \
+{ \
+  params.field = field; \
+} \
+template <typename ParamsType> \
+std::enable_if_t<!Check##name<ParamsType>::Value> \
+name(ParamsType & params) const {}
+
+
+struct FrameValues
+{
+  glsl::mat4 m_projection;
+  glsl::mat4 m_pivotTransform;
+  float m_zScale = 1.0f;
+
+  template <typename ParamsType>
+  void SetTo(ParamsType & params) const
+  {
+    SetProjection(params);
+    SetPivotTransform(params);
+    SetZScale(params);
+  }
+
+private:
+  DECLARE_SETTER(SetProjection, m_projection)
+  DECLARE_SETTER(SetPivotTransform, m_pivotTransform)
+  DECLARE_SETTER(SetZScale, m_zScale)
+};
+}  // namespace df