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Index › Programming Questions & Help › OpenGL and 3D Libraries › OpenGL to improve 2D-motion

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OpenGL to improve 2D-motion? (Read 836 times)

jjj

OpenGL to improve 2D-motion?
Oct 14^th, 2008, 1:41am

Hihi,
i'm working on a 2D project. Main thing is a rotating circle. I'm just in the testing phase and the display-performance leaves me quite unsatisfied. Should I work with OpenGL-Libaries to get a smooth motion? Are there any basic tricks on displaying motions?
I'm quite unexperienced and just want to know, if you can give me hint in which direction i should search.

You can see my state of work at

http://www.sights.de/hulala/

Thanks for help,
johannes

jjj

Re: OpenGL to improve 2D-motion?
Reply #1 - Oct 14^th, 2008, 2:15am

eehhm... ok. didn't think, that opengl support is that easy. thought it was a complete new libary. it works better now... at a framerate of 60 it looks tolerably. but there are still some strange blocking effects, lines appear, and it stucks sometimes... not realy beautiful - even at a frame rate of 60. on tv you have one of 25 i believe. but tv is so blured. is that the idea? to blur the motion somehow?

i uploaded the current version.

pelintra

Re: OpenGL to improve 2D-motion?
Reply #2 - Oct 14^th, 2008, 5:57pm

Hi.

looking at it, i think that maybe you're referring to image tearing. to resolve that you can define vertical sync to be on, using opengl commands. Vertical sync basically syncs your application's frame rate to the refresh rate of your screen so that you are always displaying images that are correctly rendered.

your code would be something like this:
Code:


import processing.opengl.*;
import javax.media.opengl.GL;

PGraphicsOpenGL pgl;
GL gl;

float a = 0;

float fix_x = 200;
float fix_y = 200;

float center_x = 0;
float center_y = 0;

void setup()
{
  size(400,400, OPENGL);
  pgl = (PGraphicsOpenGL) g; //processing graphics object
  gl = pgl.beginGL(); //begin opengl
  gl.setSwapInterval(1); //set vertical sync on
  pgl.endGL(); //end opengl
}

void draw()
{
  strokeWeight(3);
  background(180);
  smooth();
  fill(0, 0);
  a = a + 1;
  center_x = sin(a/6)*58 + fix_x;
  center_y = cos(a/6)*68 + fix_y;
  ellipse(center_x,center_y,200,200);
  fill(0);
  ellipse(200,200,70,50);
  println(frameRate);

  /* PFont font;
   font = loadFont("AnAkronism-30.vlw"); 
   textFont(font, 19); 
   String s = "framerate " + frameRate;
   text(s, 15, 20, 400, 70); */
}

jjj YaBB Newbies Offline Posts: 3	Re: OpenGL to improve 2D-motion? Reply #3 - Oct 14^th, 2008, 9:50pm thanks for your suggestion pelintra. unfortunetly it doesn't make a difference. i still have displacement-lines, as if in one frame the circle gets a different position from one line to the other. and i have some stucks in the movement. they are very short. but it just destroys the impression of a fluently motion.

adm YaBB Newbies Offline Posts: 34	Re: OpenGL to improve 2D-motion? Reply #4 - Oct 14^th, 2008, 11:23pm looks fine to me. i don't see any of those problems when i run the code pelintra posted in the PDE.

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