金属:线性纹理过滤无法按预期工作 [英] Metal: linear texture filtering not working as expected

问题描述

我在iOS上使用带有以下片段着色器的Metal:

I'm using Metal on iOS with the following fragment shader:

constexpr sampler s(coord::normalized,
                    address::clamp_to_zero,
                    filter::linear);

fragment half4 passThroughFragment(VertexInOut inFrag [[stage_in]],
                                   texture2d<float> tex [[ texture(0) ]])
{
    return half4(tex.sample(s, inFrag.uv));
}

我的纹理是4x4图像.尽管过滤设置为线性，但我得到了以下图像，并进行了最近邻居过滤:

My texture is a 4x4 image. Despite the filtering set to linear, I get the following image, with nearest neighbor filtering:

看来我的uv很好，因为当我按如下方式修改片段着色器时:

It seems that my uv's are fine, since when I modify the fragment shader as follows:

return half4(0, inFrag.uv.x, inFrag.uv.y, 1);

我得到了预期的图像:

除了指定filter::linear以外，还需要做其他一些事情来使线性过滤工作吗?

Is there something else I need to do for linear filtering to work other than specify filter::linear?

推荐答案

在我的设备(iPad Pro)上，看来MTLPixelFormatRGBA32Float类型的纹理不支持线性过滤.当我更改为MTLPixelFormatRGBA8Unorm时，过滤将按预期进行.

It appears linear filtering isn't supported for textures of type MTLPixelFormatRGBA32Float on my device (iPad Pro). When I change to MTLPixelFormatRGBA8Unorm, filtering works as expected.

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