Best practices to render multiple 2D Sprite with VBO

[SirusDoma]

[QUOTE=GClements;1280276]Using matrix functions means using a separate draw call for each sprite, which is much worse than simply uploading updated data each frame.

If the amount of data is such that memory bandwidth becomes and issue (for 20 sprites, it isn’t; probably not even for 20,000 sprites), then you should consider using a vertex shader and instancing to “compress” the data.
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ah you right! using matrix stack functions will break up into separate draw calls, that make sense
Thanks for the info!

@GClements;1280276

If you’ll be updating most of the data every frame, you may as well interleave the attributes so that you can just copy your entire array as a single operation (that assumes that the client-side data is actually in a suitable format and you can just get a pointer to it). If e.g. position and texture coordinates change every frame, you can interleave those in one VBO but put colour in a second VBO.

I got the idea here, I will consider this too!
Thanks for the suggestion!

@GClements;1280276

There’s no particular need to have a 1-to-1 correspondence between files and textures. You can pack images into textures upon loading. Although, this will be easier if the dimensions of each image are known in advance; optimally packing an arbitrary set of rectangles inside fixed-size rectangles is a hard problem. It’s somewhat easier if the images are constrained to power-of-two sizes.

@GClements;1280276

Well, you sort of have it backwards. If you want good performance, you have to design the rendering process around what’s convenient for the hardware. Breaking up draw calls hurts performance, therefore the texture data should be packed into a few large textures, therefore you can’t just use whatever texture sizes you feel like and expect the engine to deal with it.

On the other hand, if the number of sprites is actually in the dozens (rather than the thousands), “best practices” don’t really matter. You can do pretty much whatever you want and it will still only use 1% of the power of a modern GPU.

I see, since I don’t use thousands of textures, I think it will be fine to leave the textures separately
But it also good idea to pack small pieces textures into one (especially at “same layer category”)

Thanks for the information!
Your answers is really helpful!