Some `shader()` examples behave unexpectedly at higher pixel densities

Most appropriate sub-area of Processing 4?

OpenGL

Processing version

4.4.3

Operating system

Tested on macOS 13.4

Steps to reproduce this

1. Open Processing 4.4.3

2. Run examples in Topics/Shaders (for example Conway);

3. Notice the rendering is wrong

snippet

n/a

Additional context

Since version 4.4.3, the default pixelDensity is set to match the display's density. During testing, we found that some shader examples break on high-density displays because they implicitly relied on pixelDensity being set to 1.

Some investigation in how shader() is implemented and what assumptions are made there might be needed.

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