Magic_Game/core/transitions/Transition.cpp

// Copyright (c) 2016-2018 Easy2D - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "..\e2dtransition.h"
#include "..\e2dobject.h"
#include "..\e2dmodule.h"

namespace easy2d
{
	Transition::Transition(float duration)
		: done_(false)
		, started_()
		, process_(0)
		, window_size_()
		, out_scene_(nullptr)
		, in_scene_(nullptr)
		, out_layer_(nullptr)
		, in_layer_(nullptr)
		, out_layer_param_()
		, in_layer_param_()
	{
		duration_ = std::max(duration, 0.f);
	}

	Transition::~Transition()
	{
		SafeRelease(out_layer_);
		SafeRelease(in_layer_);
		SafeRelease(out_scene_);
		SafeRelease(in_scene_);
	}

	bool Transition::IsDone()
	{
		return done_;
	}

	void Transition::Init(Scene * prev, Scene * next, Game * game)
	{
		started_ = Time::Now();
		out_scene_ = prev;
		in_scene_ = next;

		if (out_scene_)
			out_scene_->Retain();

		if (in_scene_)
			in_scene_->Retain();

		auto graphics = Device::GetGraphics();
		if (in_scene_)
		{
			ThrowIfFailed(
				graphics->GetRenderTarget()->CreateLayer(&in_layer_)
			);
		}

		if (out_scene_)
		{
			ThrowIfFailed(
				graphics->GetRenderTarget()->CreateLayer(&out_layer_)
			);
		}

		window_size_ = game->GetSize();
		out_layer_param_ = in_layer_param_ = D2D1::LayerParameters(
			D2D1::RectF(
				0.f,
				0.f,
				window_size_.width,
				window_size_.height
			),
			nullptr,
			D2D1_ANTIALIAS_MODE_PER_PRIMITIVE,
			D2D1::Matrix3x2F::Identity(),
			1.f,
			graphics->GetSolidBrush(),
			D2D1_LAYER_OPTIONS_NONE
		);
	}

	void Transition::Update()
	{
		if (duration_ == 0)
		{
			process_ = 1;
		}
		else
		{
			process_ = (Time::Now() - started_).Seconds() / duration_;
			process_ = std::min(process_, 1.f);
		}

		if (process_ >= 1)
		{
			this->Stop();
		}
	}

	void Transition::Draw()
	{
		auto render_target = Device::GetGraphics()->GetRenderTarget();

		if (out_scene_)
		{
			render_target->SetTransform(out_scene_->GetTransform());
			render_target->PushAxisAlignedClip(
				D2D1::RectF(
					0.f,
					0.f,
					window_size_.width,
					window_size_.height
				),
				D2D1_ANTIALIAS_MODE_PER_PRIMITIVE
			);
			render_target->PushLayer(out_layer_param_, out_layer_);

			out_scene_->Draw();

			render_target->PopLayer();
			render_target->PopAxisAlignedClip();
		}

		if (in_scene_)
		{
			render_target->SetTransform(in_scene_->GetTransform());
			render_target->PushAxisAlignedClip(
				D2D1::RectF(
					0.f,
					0.f,
					window_size_.width,
					window_size_.height
				),
				D2D1_ANTIALIAS_MODE_PER_PRIMITIVE
			);
			render_target->PushLayer(in_layer_param_, in_layer_);

			in_scene_->Draw();

			render_target->PopLayer();
			render_target->PopAxisAlignedClip();
		}
	}

	void Transition::Stop()
	{
		done_ = true;
		Reset();
	}
}