Multiple loop and begin functions.

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Daqs

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Posted: 23rd May 2015 12:07

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I'm making a simple game on template_mac using Tier 2 C++. I came across template.cpp and template.h which have begin, loop and end functions.

I'm trying to have multiple scenes (game states) in my game such as main menu, levels, etc. for which I need to have separate begin, loop functions for each game state.

Can someone tell me how to do it? do I need to derive the template.cpp class to have access to these functions in a separate class? Thanks.

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Daqs

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Posted: 23rd May 2015 12:37

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so basically, I'm simply asking if there's a way to have multiple begin, loop functions for independent scripts? If not, how do you guys handle different scenes/game states?

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BatVink

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Posted: 23rd May 2015 22:12

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I don't use Tier 2, but the principle is the same.

You should try to create one main game loop. Within this, you can handle all of your levels with the same game logic.

Your scripts/logic should be rationalised so it can be handled in the same way for every level.

For example, take MuckyPaws' Manic Miner project. He has 40 levels, but one game loop. In a very simple format he:

Loads level from a text file. Each character in the file defines a space, solid block, eroding block, conveyor belt, key etc. He has a routine to read any file and create the level.

From this point, everything works the same. If you press a key, Miner Willy walks. Every time he reaches a new block, the logic examines the block and makes the same decision for any level, for that block type. The decision might be walk (solid block), start eroding block, continue eroding block, fall, collect key, exit level.

Quidquid latine dictum sit, altum sonatur
TutCity is being rebuilt

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IronManhood

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Posted: 23rd May 2015 23:32

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For menus, you could use a switch statement.

+ Code Snippet

while ( game = true )
{
  switch ( state )
  {
	 case 1:
		// Main Menu
	 case 2:
		// Settings
	 case 3:
		// Game code
  }
}

or you could use a if elseif.

+ Code Snippet

while ( game = true )
{
	if(state = 1)
	{
		// Main Menu
	}
	elseif(state = 2)
	{
		// Settings
	}
	elseif(state = 3)
	{
		// Game code
	}
}

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Daqs

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Posted: 24th May 2015 01:31

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Thanks guys!

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Hodgey

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Posted: 24th May 2015 03:21 Edited at: 25th May 2015 08:39

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What you should do is define an interface and have your scenes implement it.

E.g

+ Code Snippet

class IScene
{
public:
   virtual void Start() = 0;
   
   virtual void Loop() = 0;

   virtual void Exit() = 0;
}

And then you can implement different scenes and just simply call something like this:

+ Code Snippet

IScene* currentScene;
void app::Begin()
{
  currentScene = new MenuScene(); // MenuScene implements IScene 
}

void app::Loop()
{
    currentScene->Loop();

    if(someConditionHere)
    {
        currentScene->Exit(); // clean up previous scene
        currentScene = new GameScene();
        currentScene->Start();
    }
}

You should be abstracting most of your operations away. Arguably I wouldn't even have the if condition in app::Loop() but it's just an example.

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