PGraphics slow

Programming Questions

ttbitg

in Programming Questions • 3 years ago

Hi everybody,

the following sketch is giving me a framerate of about 4.

My graphics card is an Nvidia Geforce 8600M GT.

I'm totally surpised that such a simple skech runs so slow. Am i expecting too much or is there something wrng with the way i'm doing this?

Thanks for any support

import processing.opengl.*;

PGraphics pg = null;

public void setup() {

size(1440, 900, OPENGL);

pg = createGraphics(width, height, P2D);

frameRate(60);

}

public void draw() {

background(0);

println("frameRate = " + frameRate);

pg.beginDraw();

pg.fill(255);

pg.rect(mouseX, mouseY, 20, 20);

pg.fill(0, 30);

pg.rect(0, 0, width, height);

pg.endDraw();

image(pg, 0, 0);

}

Replies(10)

kooogy

Re: PGraphics slow

3 years ago

graphics card doesn't matter - you're not really using it.

all of this:

pg.fill(255);

pg.rect(mouseX, mouseY, 20, 20);

pg.fill(0, 30);

pg.rect(0, 0, width, height);

is just working on the pixel buffer, the 1440x900 pixels (=1.2 million) that you define in your size. you're rewriting the entire thing several times and then displaying the result to the screen.

monkstone

Re: PGraphics slow

3 years ago

Previous references (prior to 1.2.1) used to say it was not possible to createGraphics with the OPENGL renderer, so I presume that has changed.

ttbitg

Re: PGraphics slow

3 years ago

@ koogy

thanks for your answer.

i'm lacking any feeling on how complicated it is to work on so many pixels.

and if i get you right it seems to be far more complicate (cpu intensive) than i thought.

still a little bit puzzled that this should be so cpu intensive.

now i changed the sketch so it only draws the small rect (// pg.rect(0, 0, width, height);) but the framerate doesn't get better.

is this really that complicated? i mean i have 3d games (not processing programms) running on this machine in high resolution that have high framerates.

ttbitg

Re: PGraphics slow

3 years ago

@monkstone

createGraphics(width, height, OPENGL) still doesn't work

ttbitg

Re: PGraphics slow

3 years ago

new observation:

when the whole sketch is running under P2D:

size(1440, 900, P2D)

framerate gets a push to 25.

better but still surprisingly slow and i need opengl any way.

ttbitg

Re: PGraphics slow

3 years ago

next test: the following sketch does the same as the first one minus PGraphics and it gives me over 60 frames.

does this make sense to someone?

import processing.opengl.*;

PGraphics pg = null;

public void setup() {

size(1440, 900, OPENGL);

frameRate(60);

}

public void draw() {

background(0);

println("frameRate = " + frameRate);

fill(255);

rect(mouseX, mouseY, 20, 20);

fill(0, 30);

rect(0, 0, width, height);

}

bjordal

Re: Re: PGraphics slow

3 years ago

yes it makes sense.
Like kooogy said, in the previous code you were pushing 1296000 pixels into the screen buffer every frame, now you aren't.

ttbitg

Re: PGraphics slow

3 years ago

@bjordal

thanks for helping. so if i get you right the expensive operation is the copying of so many pixels from the pgrahics object into the screen buffer.

what still confuses me ist that doing this with a big PImage seems to be no problem. The follwing sketch results in 60 frames. shouldn't this be much slower if the copying is the problem? i really woud like to understand that.

import processing.opengl.*;

PImage img = null;

public void setup() {

size(1440, 900, OPENGL);

img = createImage(1440, 900, RGB);

frameRate(60);

}

public void draw() {

background(0);

println("frameRate = " + frameRate);

image(img, 0, 0);

}

kooogy

Re: PGraphics slow

3 years ago

the println is also having an effect btw...

print it out only every 100th frame and see if it improves

^ er, no, i've run your code now and there's no way that the println is making it 10 times slower 8) hadn't realised the extent of the problem.

ttbitg

Re: PGraphics slow

3 years ago

i tried it but it doesn't make a difference. this is strange.

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PGraphics slow

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