curveVertex() causes OutOfMemory in P2D renderer

Created by: Real-John-Cheung

Description

curveVertex() causes java.lang.OutOfMemoryError: Java heap space error when the vertex amount is big in P2D render. With the default Java2D render it works fine.

void setup(){
  size(800,800, P2D);
  beginShape();
  for(int i = 0; i < 26000;i ++){ 
    curveVertex(i * 0.1, 100);
  }
  endShape();
}

Above sketch crashes due to OutOfMemoryError, below sketches can be executed without problem:

void setup(){
  size(800,800);
  beginShape();
  for(int i = 0; i < 26000;i ++){ 
    curveVertex(i * 0.1, 100);
  }
  endShape();
}

void setup(){
  size(800,800, P2D);
  beginShape();
  for(int i = 0; i < 2000;i ++){ 
    curveVertex(i * 0.1, 100);
  }
  endShape();
}

Your Environment

• Processing version: 4.3
• Operating System and OS version: macOS 14.4.1
• Other information: on a Intel Mac

Possible Causes / Solutions

Might have something to do with how Catmull-Rom splines is calculated in P2D?

Start by running the supplied Processing 4.3 sketch with the P2D renderer, comparing 26,000 and 2,000 curveVertex() calls and the Java2D version. Trace the beginShape(), curveVertex(), and endShape() entry points through the P2D renderer. Done means the large sketch no longer exhausts the Java heap while preserving the expected curve output.