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OpenGL and NSScreen.mainScreen.backingScaleFactor

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Key-Real:
I init openGL

now i wanna set

--- Code: Pascal  [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---glPixelZoom(pixelSizeX, -pixelSizeY); to dispaly a image with width and height to the entire window

for this I do:

--- Code: Pascal  [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---    rect:= window.frame;    WindowBackingRect :=  window.convertRectToBacking(rect);   pixelSizeX :=  WindowBackingRect.size.width / width / NSScreen.mainScreen.backingScaleFactor;  pixelSizeY :=  WindowBackingRect.size.height / height / NSScreen.mainScreen.backingScaleFactor; 
under High Sierra 10.13.6 on an intel mac from 2011 NSScreen.mainScreen.backingScaleFactor return 1 because there is no retina.
under Sonoma 14.3 an an intel mac from 2020 NSScreen.mainScreen.backingScaleFactor return 2 because of retina.
this works correct.

under Venture 13.6 on an aarch64 mac from 2020 NSScreen.mainScreen.backingScaleFactor returns 2 BUT the image is only half so big as it should be.

(if i let the scale factor away on the new intel mac, the image is twice big as it should be. On the new AArch64 mac it is correct.)

what to do?

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