Move image between textures

Programming Questions

pilointer..

in Programming Questions • 3 years ago

Hai folks!

I'm trying to move two images between two textures, the problem is that the framerate is dropping to around 10 when doing this, and I eventually will need to move more than one image, so I'm guessing i'm doing something wrong here. :-)

Here's my snip of code so far:

import processing.opengl.*;
PImage a;
PImage b;
void setup(){
size(800, 800, OPENGL);
noStroke();
a = loadImage("tex1.png");
b = loadImage("tex2.png");
}
void draw(){
background(0);
updateTextures(a, b, 1);
beginShape();
texture(a);
vertex(40, 80, 0, 0);
vertex(320, 20, b.width, 0);
vertex(380, 360, b.width, b.height);
vertex(80, 380, 0, b.height);
endShape();
beginShape();
texture(b);
vertex(40, 430, 0, 0);
vertex(350, 420, b.width, 0);
vertex(330, 760, b.width, b.height);
vertex(50, 780, 0, b.height);
endShape();
}
void updateTextures(PImage img1, PImage img2, int speed){
img1.loadPixels();
img2.loadPixels();
for(int i = 0; i < (img1.width * img1.height) - img1.width; i++) {
img1.pixels[i] = img1.pixels[i + img1.width];
if(i < img1.width){
img1.pixels[((img1.width * img1.height) - img1.width) + i] = img2.pixels[i];
}
img2.pixels[i] = img2.pixels[i + img2.width];
}
img1.updatePixels();
img2.updatePixels();
}

Any help would be very much appreciated!
Thanks!

Replies(3)

guy_yitzh..

Re: Move image between textures

3 years ago

The first thing I tried was to use arrayCopy instead of iterating through the pixels array and copying - this made some improvement but not very significant.

However, I don't know if you plan to use any OpenGL specific features (and I know very little about it), but if not, then try using P3D instead of the OpenGL renderer. This worked magic on my machine - the framerate jumped from 8 to 36.

size(800, 800, P3D);

kooogy

Re: Move image between textures

3 years ago

if all you're doing is scrolling from one texture to the other then you can make the texture twice as large and modify the u and v values in the vertex call to modify which part of the texture is shown (like the target quad is a window into the texture)

pilointer..

Re: Move image between textures

3 years ago

@guy_yitzhaki Thanks, the P3D helped a lot, but the performance still goes down way too much when moving many objects. I'll try the arrayCopy and see if that helps.

@kooogy Thing is, all the objects have different shapes, so I dont think that will work, or did I misunderstand you?

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