rounded rectangle performance in P2D / P3D is extremely poor when stroke is used

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#1,566 3 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
55/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
java
Domain
computer-graphics, performance

Research direction

Start by running the supplied Java sketch in Processing 4.5.6 and compare the frame rate with stroke enabled versus disabled, in both P2D and P3D. Trace the rounded-rectangle rendering path used by these modes; done means the reproduction no longer shows the reported severe slowdown while preserving stroked rounded rectangles.

Written by the indexing model from the issue text.

Description

lower priority
Image

MacBook Air M3
Processing 4.5.6 (but also older versions apply)

This runs at around 8.5 fps.

void setup() {
  size(800, 800, P2D);
  frameRate(999);
}

void draw() {
  background(0);

  int cols = 16;
  int rows = 16;
  float margin = 50;
  float gap = 10;

  float rectW = (width - margin * 2 - gap * (cols - 1)) / cols;
  float rectH = (height - margin * 2 - gap * (rows - 1)) / rows;

  fill(255, 220, 0);
  stroke(255);
  strokeWeight(2);
  
  for (int y = 0; y < rows; y++) {
    for (int x = 0; x < cols; x++) {
      float px = margin + x * (rectW + gap);
      float py = margin + y * (rectH + gap);

      rect(px, py, rectW, rectH, 10);
    }
  }

  println(frameRate);
}
Dominant language
Java
Stars
497
Forks
183
Avg merge
4h 39m
Merged PRs (30d)
3

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