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Help => Graphics => Topic started by: MattF on November 08, 2012, 01:59:09 pm

Title: Optimizing Texture and Sprite management
Post by: MattF on November 08, 2012, 01:59:09 pm
Hi!

I have a multi-part question regarding the proper way of loading, storing and accessing textures and sprites.

Currently i am working on a 2d side-scrolling brawler. Three major game elements, which use textures and sprites are hero, enemies and background/map. I'd like to implement parallax scrolling later on.

Anyway, i wanted to ask about a proper way to load and store gfx elements for each of those instances.

For hero class, i keep all textures and sprites as members, and load textures in the constructor. Since there is only one hero, and he is loaded with the map, it should just work fine. Here's relevant parts:


Hero::Hero (b2World *aWorld, float posX, float posY) : world(aWorld)
        {
                hero_run.loadFromFile("HeroTextures/run.png");
                hero_turn.loadFromFile("HeroTextures/turn.png");
                hero_jump.loadFromFile("HeroTextures/jump.png");
                hero_crouch.loadFromFile("HeroTextures/crouch.png");
                hero_roll.loadFromFile("HeroTextures/roll.png");
                hero_stop.loadFromFile("HeroTextures/stop.png");
                hero_stand.loadFromFile("HeroTextures/stand.png");
                hero_attack.loadFromFile("HeroTextures/attack.png");
                m_sprite.setPosition(posX, posY);
                m_sprite.setOrigin(250,250);
                frame = 0;
                set_b2_body(); // Box2d stuff
               
 }

void Hero::display(State state)
{
        switch(state)
        {
        case running:
                if( direction == right)
                m_sprite.setScale(1.0f,1.0f);
                else
                m_sprite.setScale(-1.0f,1.0f);

                m_sprite.setTexture(hero_run);
                m_sprite.setTextureRect(hero_run_clips[frame]);
                frame++;
                if (frame > 20 )
                        frame = 0;
                break;
}

 

That's the gist of it. I imagine, for enemy class, i'll have to load textures somewhere else, because there will be mutliple enemies constructed from the same texture. Other than that, setTexture seems the way to go.

So regarding this part, my question is: is this the optimal way of handling graphics for animated entities, or could i store it, or access it in more optimized way?


Second part of my post pertains to the background. After preparing elements of the map i just set em the standard way:


TestLevel::TestLevel(b2World *aWorld) : world(aWorld)

{
        backgTexture1.loadFromFile("background/testlevel1.jpg");
        backgTexture2.loadFromFile("background/testlevel2.jpg");
        backgTexture3.loadFromFile("background/testlevel3.jpg");
        background1.setTexture(backgTexture1);
        background2.setTexture(backgTexture2);
        background3.setTexture(backgTexture3);
        background1.setPosition(0,0);
        background2.setPosition(5000,0);
        background3.setPosition(10000,0);
        set_ground_bodies(); // box2d stuff
}

 

It runs nice and all, but loading time is now good couple seconds, and it's only a small part of an actual planned level. Those textures are pretty big though (5000x5000).

So my last question is: how to improve loading time?

Edit: only part of my post showed the 1st time, edited for full version.
Title: Re: Optimizing Texture and Sprite management
Post by: Laurent on November 08, 2012, 02:28:18 pm
Quote
So regarding this part, my question is: is this the optimal way of handling graphics for animated entities, or could i store it, or access it in more optimized way?
It would be even more optimized with all the animations put into the same texture, but otherwise it's ok.

Quote
So my last question is: how to improve loading time?
You can't. The only thing that you can do is to load textures on the fly in a thread, if possible.
Title: Re: Optimizing Texture and Sprite management
Post by: MattF on November 08, 2012, 02:43:22 pm
Ok, thanks.

Since this game won't be a resource hog, i guess it won't be a problem to load 20% of the map, and load rest on the fly.
Title: Re: Optimizing Texture and Sprite management
Post by: Brodal on November 10, 2012, 01:34:57 pm
One way to handle textures that is to my liking is to use a texture manager of sorts. In my case it is usually a singleton that loads textures for me when i need them ( singletons are kinda frowned upon so someones probably gonna argue with me there ). I use an std::map to store each texture with a string as key value to it, and when i want a texture i call the manager and ask for a texture, if the texture doesn't exist in the map i load it, if it does exist i just return a reference to it. There are many ways to do it, this is just one :)
Title: Re: Optimizing Texture and Sprite management
Post by: mateandmetal on November 11, 2012, 09:52:30 pm
1) Don´t load files in the object constructor. File loading may fail, and you can have a "half constructed" object (Put the loading code in a loading function).
2 ) Put all the character animations into 1 texture file. This should be better for your graphics driver, and even better for your hard drive
Title: Re: Optimizing Texture and Sprite management
Post by: Halsys on November 11, 2012, 10:46:06 pm
This is mostly used for 3d games but try researching Mipmaps...
That way, progressively, your loading the sprites...
This is also great for when you want to zoom out and will not be able to see the whites of there eyes to begin with.

Ya its stupid, Mipmaps for 2D games? Here's my offer, Why not?
Title: Re: Optimizing Texture and Sprite management
Post by: eXpl0it3r on November 11, 2012, 10:48:49 pm
Quote from: mateandmetal on November 11, 2012, 09:52:30 pm
1) Don´t load files in the object constructor. File loading may fail, and you can have a "half constructed" object (Put the loading code in a loading function).
He doesn't load files manually and it's perfectly safe to call loadFromFile on a sf::Texture in the constructor. If the image file doesn't exist you'll just be left with an white square.

If you load files on your own, you better handle the exception correctly, than just putting somewhere else. But depending on the logic it might be nicer to put it somewhere else. ;)
Title: Re: Optimizing Texture and Sprite management
Post by: mateandmetal on November 12, 2012, 04:28:14 pm
It seems we will never agree in something  ;D
(just kidding)