SDL-GameDevelopment/GameStateMachine.cpp at master · Ahmed310/SDL-GameDevelopment · GitHub

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#include "GameStateMachine.h"


void GameStateMachine::PushState(GameState* state)
{
	m_gameStates.push_back(state);
	m_gameStates.back()->OnEnter();
}
void GameStateMachine::ChangeState(GameState* state)
{
	if (!m_gameStates.empty())
	{
		if (m_gameStates.back()->GetStateID() == state->GetStateID())
		{
			return; // do nothing
		}
		if (m_gameStates.back()->OnExit())
		{
			delete m_gameStates.back();
			m_gameStates.pop_back();
		}
	}
	// push back our new state
	m_gameStates.push_back(state);
	// initialise it
	m_gameStates.back()->OnEnter();
}
void GameStateMachine::PopState()
{
	if (!m_gameStates.empty())
	{
		if (m_gameStates.back()->OnExit())
		{
			delete m_gameStates.back();
			m_gameStates.pop_back();
		}
	}
}


void GameStateMachine::Update()
{
	if (!m_gameStates.empty())
	{
		m_gameStates.back()->Update();
	}
}
void GameStateMachine::Render()
{
	if (!m_gameStates.empty())
	{
		m_gameStates.back()->Render();
	}
}