Expose SamplerState from Texture

Unity Engine
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1

I’m trying to make a Re-usable Texture2DGrad node, so that I can pass in custom derivatives for certain effects.

However I can’t figure out a way to use the SamplerState from an existing texture, I can only use a custom SamplerState which is limited to either Point, Bilinear or Trilinear.

This is an issue because in vert/frag shaders, you can declare SamplerState sampler_TextureName; and it will inherit the properties of the texture, including wrap, filtermode and anisotropy. This way, when Anisotropic Textures are enabled through QualitySettings, your custom shaders which use SampleGrad/Tex2DGrad will also use anisotropic filtering automatically.

My custom function looks like this currently. It requires manually passing in a SamplerState in ShaderGraph, but as far as I can tell there’s no way to get the SamplerState from a texture, so it’s always going to be either bilinear or trilinear, with no anisotropic filtering.

A pretty simple fix would just be a way to get the SamplerState from a texture in ShaderGraph, not sure how I would do this though.

void SampleTexture2DGrad_float(TEXTURE2D(tex), SAMPLER(texSampler), float2 uv, float2 gradX, float2 gradY, out float4 color, out float r, out float g, out float b, out float a)
{
    color = SAMPLE_TEXTURE2D_GRAD(tex, texSampler, uv, gradX, gradY);
    r = color.r;
    g = color.g;
    b = color.b;
    a = color.a;
}
7 Likes
2

Same problem here - looking for a way to pass in the sampler for a user-provided texture into a custom function.

1 Like
3

Same. In my case I want to use anisotropic sampler inside a custom function, but A) shader graph sampler state node provides no control over anisotropy, so I can’t wire an appropriate sampler state node into the function, and B) there appears to be no way to access the anisotropic sampler state already associated with the texture input.

4

Same issues here. Has anyone found a solution to this issue? Has anyone found a solution?

5

Yes please. To make things worse, the boolean or enum nodes don’t support SamplerState as a transported type in case you need to chose based on preprocessors definition. Also, the SS cannot be plugged into a Branch node, so we’re basically stuck with NO way to either:

  • Fetch the SS from texture.
  • Switch between multiple SSs either at run-time or compile-time.
6

Just hit this problem too. Would like to specify SamplerState values in a material.

7

I know it has been too long but there is a solution with new subgraph:

Usage:
Use float values for SamplerState:
For Filter: 0 = Linear, 1 = Point, 2 = Trilinear
For Warp: 0 = Repeat, 1 = Clamp, 2 = Mirror, 3 = Mirror Once

Also, you should connect UV Node to uv port of node to show texture.

Example usage:

7629637--949522--Capture.PNG
7629637--949522--Capture.PNG709×529 24.1 KB

7629637–949516–ExposedSamplerState.unitypackage (5 KB)