即使使用[MTKTextureLoader.Option.SRGB:false]，金属也会渲染出奇特的深色纹理? [英] Metal rendering odd darker textures even with [MTKTextureLoader.Option.SRGB : false]?

问题描述

我已经检查了这个问题.在纹理加载器选项中使用[MTKTextureLoader.Option.SRGB : false]不起作用.发生的全部是当我执行[MTKTextureLoader.Option.SRGB : true]时，它的颜色要深得多，而不是稍微深一些.肯定还有别的东西.这是此不良行为的示例. 这是供参考的原始纹理:

如您所见，我正在使用鼠标将原始填充的冰纹理保留在渲染的冰纹理上.即使使用[MTKTextureLoader.Option.SRGB : false]，它也要轻得多.即使我将鼠标悬停在渲染的纹理上的图像是稍微透明的，但仍然明显存在不想要的效果.

I already checked this question. Using [MTKTextureLoader.Option.SRGB : false] in texture loader options doesn't work. All that happens is when I do [MTKTextureLoader.Option.SRGB : true], it's a lot darker instead of slightly darker. There must be something else. Here is an example of this unwanted behavior. Here is the original texture for reference:

As you can see I am using the mouse to hold the original packed ice texture over the rendered one. It's considerably lighter, even with [MTKTextureLoader.Option.SRGB : false]. Even though the image I am hovering over the rendered texture is slightly transparent, the unwanted effect is still clearly present.

这是我的片段函数:

fragment half4 TextureFragment(VertexOut VertexIn [[stage_in]], texture2d<float> Texture [[texture(0)]]) {
    constexpr sampler ColorSampler(mip_filter::nearest, mag_filter::nearest, min_filter::nearest);
    float4 Color = Texture.sample(ColorSampler, VertexIn.TexCoord.xy / VertexIn.TexCoord.z);
    return half4(Color.r, Color.g, Color.b, 1);
}

如何解决该问题?如何渲染实际的纹理而不是较暗的版本?

How can I fix the problem? How can I render the actual texture instead of a darker version?

注意:我必须修复问题，而不是解决它.解决方法类似于片段着色器中的return half4(Color.r+0.1, Color.g+0.1, Color.b+0.1, 1);.我必须从根本上解决问题.为什么库中有那么多错误?

Note: I must fix the problem, not work around it. A workaround would be like return half4(Color.r+0.1, Color.g+0.1, Color.b+0.1, 1); from the fragment shader. I must fix the problem from the root. Why are there so many bugs within the libraries?

我还尝试将黑色背景更改为白色，并且它不会更改纹理，因此不起作用.

I also tried changing the black background to white, and it doesn't change the texture, so that doesn't work.

我想我曾经被告知要使用Xcode的GPU帧调试器检查纹理.是什么意思?

I think I was once told to check the texture using Xcode's GPU frame debugger. What does that mean?

我们将不胜感激.

推荐答案

要加载这些PNG图像，我需要将pixelFormat设置为bgra8Unorm_srgb而不是bgra8Unorm.为什么默认情况下它不只是bgra8Unorm_srgb? 此答案指定如何执行此操作.我自己弄清楚了，与此同时，我没有其他意见，也没有其他答案.我基本上不得不独自解决这个问题.

For loading those PNG images, I need to set the pixelFormat to bgra8Unorm_srgb instead of bgra8Unorm. Why isn't it just bgra8Unorm_srgb by default? This answer specifies how to do this. I figured it out myself, meanwhile I got no other comments, no other answers. I basically had to figure it out alone.

MetalView.colorPixelFormat = .bgra8Unorm_srgb

我可以

PipelineDescriptor.colorAttachments[0].pixelFormat = .bgra8Unorm_srgb

所以我得到了正确的图像

So I get the correct image rendered

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