T. Mulard

As a beginner in Max, I wanted to experiment on different things, and this time it was with shaders.

Following some videos of 'Amazing Max Stuff'( https://www.youtube.com/@AmazingMaxStuff ), I tried implementing a patcher from ShaderToy (haven't found the link yet) and it worked flawlessly on Mac (version 10.14). But on Windows (10), when the shader runs, only the top right quarter of the window displays it, leaving the rest of it black, and even if I change the window size the problem remains.

I tried searched online and found no answer yet, can you help ?

shadertest.maxpat

testShader.jxs

Hello everyone,

As a beginner in Max, I wanted to experiment on different things, and this time it was with shaders.

Following some videos of 'Amazing Max Stuff'( https://www.youtube.com/@AmazingMaxStuff ), I tried implementing a patcher from ShaderToy (haven't found the link yet) and it worked flawlessly on Mac (version 10.14). But on Windows (10), when the shader runs, only the top right quarter of the window displays it, leaving the rest of it black, and even if I change the window size the problem remains.

I tried searched online and found no answer yet, can you help ?

Theo


Hello everyone,

As a beginner in Max, I wanted to experiment on different things, and this time it was with shaders.

Following some ... 

shader-working-on-mac-but-only-showing-on-a-quarter-of-the-window-on-windows

I think that rather than passing in the VIEWPORT state for iResolution, you should pass in the dimensions of the texture (TEXDIM0). so change 

The reason for this is that with high-dpi rendering, the viewport dimensions may be half (or some other multiple) of the texture dimensions, so best to pass the actual tex dims for those calculations. Confusing I know but that should fix things up.

I think that rather than passing in the VIEWPORT state for iResolution, you should pass in the dimensions of the texture (TEXDIM0). so change state="VIEWPORT" to state="TEXDIM0" in your JXS header.

Sorry for the delay, but I tried adding your changes to the state and now even the quarter that used to display the shader is just a white square. 

Edit: My bad, the white square was due to a typo in TEXTDIM0. I tried afterwards with the correction but still it only shows a quarter of the shader

Sorry for the delay, but I tried adding your changes to the state and now even the quarter that used to display the shader is just a white square. 
Thanks anyway for the advice.

Edit: My bad, the white square was due to a typo in TEXTDIM0. I tried afterwards with the correction but still it only shows a quarter of the shader


hmm, one thing to make sure of is that you are using your machine's dedicated GPU rather than in integrated one (assuming you are on a laptop that has both), as described 

hmm, one thing to make sure of is that you are using your machine's dedicated GPU rather than in integrated one (assuming you are on a laptop that has both), as described here 

Hey! Really sorry about the late answer but you were right, the dedicated GPU and performance over quality choice really did the trick. Thanks for the help, it displays entirely now.

Hey! Really sorry about the late answer but you were right, the dedicated GPU and performance over quality choice really did the trick. Thanks for the help, it displays entirely now.

Regards,

Theo

Shader working on Mac but only showing on a quarter of the window on Windows