I’m using a Landscape Material with many Layers. All are optimized with a Landscape Layer Switch. On Windows all is fine but on Mac the most Landscape Sections does not compile in the same Level:
Failed to compile Material <MaterialName> for platform GLSL_150_MAC, Default Material will be used in game.
In the Instance I’ve seen that there are to much Texture Samplers. Then I deactivated all Normal Maps (8 Texture Samplers). My Material has now 13/16 Texture Samplers with all Layers active but there are still 2 Sections that doesn’t compile. How is this possible? Why does the Windows Version has no errors with 8 Texture Samplers more?
Edit:
UE 4.8.2 Launcher Version
When I preview Shader Model 4 on Windows all is fine.
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We added a new feature in 4.6 which allows you to ‘share’ your texture samples. This increases the texture sample ceiling to 128 texture samples per material shader!
Hi,
thank you for the answer but this is not a resolution for me. I haven’t used this feature with DirectX with intent to be compatible with Mac but it doesn’t compile at Mac anyway.
I found a helpful forum post that will help explain why you are limited the number of texture samples on your Mac. In short, it is a limitation that we were able to work around recently by using the Shared: Wrapped texture setting.
Max Texture Samples
Basically you are limited by the shader model that Mac’s use at the moment.
