performance between scale and texture size

[GBear]

hi...

hi i tested with under image

code like this

<<draw 50000's buunys>>

Quote

for(var i = 0; i < 50000; ++i) {
    var spr = PIXI.Sprite.fromImage('assets/bunnys.png');                
    spr.position.set(Math.random()*1200 + 200, Math.random()*400 + 100);
    spr.scale.set(2, 2);
    stage.addChild(spr);

 

<<draw 50000's buunys_big >>

Quote

for(var i = 0; i < 50000; ++i) {
    var spr = PIXI.Sprite.fromImage('assets/bunnys_big.png');
    spr.position.set(Math.random()*1200 + 200, Math.random()*400 + 100);
    stage.addChild(spr);
}

 

this two code has same performance.. T-T

Isn't Texture size related of performance?

is only related by scale of sprite size(of vertex size)?

 

bunnys.png

 

bunnys_big.png

[ivan.popelyshev]

Welcome to webgl. Fragment shader is one of the most slow things there, and it directly depends on how many pixels do you draw.

[GBear]

@ivan.popelyshev  TOT hi Ivan.. 

 

Quote

Welcome to webgl. Fragment shader is one of the most slow things there, and it directly depends on how many pixels do you draw.

Is this meaning 

One Big UI that only one texture like (1280*400)  is better performance than generated UI(1280*400) by small pieces ?

 

 

 

 

[ivan.popelyshev]

@GBear only a bit, if there are 100 pieces then noo, its not  if there are 1000 then we'll have problem with too many updateTransform() but that will be fixed in next pixi version. If 10000 then we'll have problem with uploading large vertex buffers very frame.

So you can assume that it depends heavily on the area, and every time you use a filter, you have to add an area equal to filter bounds.

[totor]

iirc texture is loaded in texture buffer which has a fixed size let"s say 1000, so if if your big texture fits in the buffer there is no difference in rendering small or big but if your texture is for example 1001, ie 1 more than the buffer size then the texture is split so you need two buffer calls (+ switching). That's how it worked at driver level in GL but it has been years since i walked this path.

[ivan.popelyshev]

And if you use mipmaps  and render big texture into small area, it will actually use smaller texture for it - and again, area will be more important parameter than texture size

[GBear]

Quote

and again, area will be more important parameter than texture size

what is this meaning?

[ivan.popelyshev]

6 hours ago, GBear said:

what is this meaning?

area. as a number of pixels you draw on screen.

[GBear]

@ivan.popelyshev hi~~

Quote

And if you use mipmaps  and render big texture into small area, it will actually use smaller texture for it - and again, area will be more important parameter than texture size

is using mipmap  good for performance with v3?