rpcsx/rpcs3/Emu/RSX/Overlays/overlay_animation.h

#pragma once

#include "util/types.hpp"
#include "Utilities/geometry.h"
#include "overlay_utils.h"

#include <functional>

namespace rsx
{
	namespace overlays
	{
		struct compiled_resource;

		enum class animation_type
		{
			linear,
			ease_in_quad,
			ease_out_quad,
			ease_in_out_cubic,
		};

		struct animation_base
		{
		protected:
			u64 timestamp_start_us = 0;
			u64 timestamp_end_us = 0;

			void begin_animation(u64 timestamp_us);
			f32 get_progress_ratio(u64 timestamp_us) const;

			template<typename T>
			static T lerp(const T& a, const T& b, f32 t)
			{
				return (a * (1.f - t)) + (b * t);
			}

		public:
			bool active = false;
			animation_type type { animation_type::linear };
			f32 duration_sec = 1.f; // in seconds

			std::function<void()> on_finish;

			u64 get_total_duration_us() const;
			u64 get_remaining_duration_us(u64 timestamp_us) const;

			virtual void apply(compiled_resource&) = 0;
			virtual void reset(u64 start_timestamp_us) = 0;
			virtual void update(u64 timestamp_us) = 0;
		};

		struct animation_translate : animation_base
		{
		private:
			vector3f start{}; // Set `current` instead of this
			                  // NOTE: Necessary because update() is called after rendering,
			                  //       resulting in one frame of incorrect translation
		public:
			vector3f current{};
			vector3f end{};

			void apply(compiled_resource& data) override;
			void reset(u64 start_timestamp_us = 0) override;
			void update(u64 timestamp_us) override;
			void finish();
		};

		struct animation_color_interpolate : animation_translate
		{
		private:
			color4f start{};

		public:
			color4f current{};
			color4f end{};

			void apply(compiled_resource& data) override;
			void reset(u64 start_timestamp_us = 0) override;
			void update(u64 timestamp_us) override;
			void finish();
		};
	}
}