Some newby questions !

[anna_linkpy]

Helloooooo thereeeee !

So, I'm not really a newby, but I never wanted to use SFML for doing what I want to do. And here comes my questions :

I/ About sf::Sprite :

sf::Sprite sprite = // ... //

// ... Code code code ... //

// Drawing part
sprite.setTextureRect (// ... //);
window.draw (sprite);
sprite.setTextureRect (// ... //);
sprite.setPosition (// ... //);
window.draw (sprite);

If I have got a texture atlas, this code will works or not ?

II/ No sprite batch for optimized drawing ?

III/ It was a retoric question ! But, How can I optimize map drawing ?

Thanks for your answers ! :3

[Jesper Juhl]

If I have got a texture atlas, this code will works or not ?

Have you considered trying? You could answer your own question in 5minutes.

 

II/ No sprite batch for optimized drawing ?

III/ It was a retoric question ! But, How can I optimize map drawing ?

Look into sf::VertexArray. But make sure you have an actual performance problem first.

[anna_linkpy]

Sorry, I'm a Löve2D user, so I'm used to LuaJIT and it's speed (with my projet, I checked every "draw" call, and even with this my render was slow : 102FPS... Or it was pretty fast if we consider my actual PC ).

I will try and go look for VertexBuffer.

PS: I don't do this for a performance problem, I'm just maniac and I want my game to be fast and enjoyable on very old PC ^^

[Rosme]

You're over-optimizing. Don't bother at the moment, no matter the final goal. You should optimize when you have issue. 102 FPS is more than sufficient. At that amount, it doesn't really matter.

[Jesper Juhl]

I'd go as far as saying that if you currently do 102fps, then set a sane framerate limit (like 60) and save some CPU time/power. There's no point wasting cycles rendering a bunch of redundant frames that won't even make any visual difference to the player.
Optimizing for (or at least rendering) more fps beyond what the user can actually notice is a waste of time (and energy) in most cases (IMHO).

[Jesper Juhl]

I will try and go look for VertexBuffer.

I said sf::VertexArray, not VertexBuffer.

[anna_linkpy]

Yes, it's VertexArray, not VertexBuffer sorry ^^'

But, I look at the API... I see that VertexArray class doesn't have texturing method... How can I use texture with this class ?

[shadowmouse]

Have a look at the vertex array tutorial. It's usually better to start with the tutorial for things like this and then check the API docs for syntax. http://www.sfml-dev.org/tutorials/2.3/graphics-vertex-array.php

[Hapax]

Vertex arrays do allow texturing. They are mainly just a collection of vertices, each with position, colour, and texture co-ordinates. The tutorial that shadowmouse linked should get you started (or be enough as it's plenty of information for most cases) even has a section on texturing!

[anna_linkpy]

Okayyyyy ! So awesome !

When I looked at the API, I didn't see any function for drawing a VertexArray with a texture ! Now I can start my project ! Thanks a lot !