Renlite

I changed the first frame drawing in https://github.com/renlite/relflor/blob/master/render_sample_hello/lib/main.dart Now Skia renders. IC (incremental compilation of flutter assemble ...) issue is still open.

You can find the example in PR #3121: [example/flexrect.go](https://github.com/fyne-io/fyne/pull/3121/files#diff-90431526b53b1b9510c32b3617ac4c5fcb8d8d62de400bf6729cd73bf778d734) In the draw.go there are ```println()```commands included. But the issue should happen on the master branche too.

With 'fyne serve --target wasm' I get these errors on firefox: 

Thank you for the information! I will try to find the issue too.

I forgot the initialization of ```p.rectangleProgram = p.createProgram("rectangle_es")``` in gl_goxjs.go. After implementation:  The error happens after the compilation of the shaders. Could you please test the GL_ES on a...

 I found the issue why ```drawArrays(...)``` did not work. It seems that GL ES is stricter than GL. My calculation of triangle points was not correct. I changed it...

Rendering on WebGL (GL ES) works now. There is an error or a difference between GL and GL ES in handling the different number of VertexAttribArray index. https://stackoverflow.com/questions/9705771/conflict-when-using-two-or-more-shaders-with-different-number-of-attributes?rq=1 The VertexAttribArrays...

Yes, I will open a separate issue. Could you please tell me, what is the difference between gopherjs and wasm when developing wiht fyne? As far as I understand with...

In [draw.go](https://github.com/fyne-io/fyne/blob/master/internal/painter/draw.go) you are using module [rasterx](https://github.com/srwiley/rasterx/blob/master/shapes.go) to draw Line, Rect and Circle. Would it work, to extend draw.go with `func DrawRoundedRectangle(...)`, which calls the `func DrawRectangle(...)`, if no corner...

So far I understand the Circle object is always rendered as fallback and for OpenGL rendering of a RoundRect there would be a solution necessary like: Texture 9-slices (Triangle) or...