blocks|key|38143|text|有一个名为ShaderLab的内置值_ScreenParams。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|38144|_ScreenParams.x是以像素为单位的屏幕宽度。_ScreenParams.y是以像素为单位的屏幕高度。|38145|以下是文档页面：http://docs.unity3d.com/462/Documentation/Manual/SL-BuiltinValues.html|offset|length|38146|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.unity3d.com/462/Documentation/Manual/SL-BuiltinValues.html^0|0|0|8|1Y|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

There is a ShaderLab built-in value called _ScreenParams.

_ScreenParams.x is the screen width in pixels.
_ScreenParams.y is the screen height in pixels.

Here's the documentation page: <a href="http://docs.unity3d.com/462/Documentation/Manual/SL-BuiltinValues.html">http://docs.unity3d.com/462/Documentation/Manual/SL-BuiltinValues.html</a>

blocks|key|37547|text|我不认为这会发生。您的渲染是与当前选定的视频模式，它甚至不需要匹配您的物理屏幕大小(如果这是您的意思是像素完美)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|37548|与此最接近的是，如果您为显示设备呈现推荐的分辨率，并使用像素着色器对整个屏幕进行阴影处理。这样，一个‘物理像素’将大致等于一个实际呈现的像素。除此之外，不可能将物理(即显示的)像素与呈现的像素相关联。|37549|当然，除非我误解了你的意图。|37550|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I don't think this is going to happen. Your rendering is tied to current selected video mode and it doesn't even have to match your physical screen size (if that is what you mean by pixel-perfect).

The closest you are going to get with this is if you render at recommended resolution for your display device and use pixel shader to shade an entire screen. This way, one 'physical pixel' is going to be roughly equal to one actual rendered pixel. Other than that, it is impossible to associate physical (that is your display's) pixels to rendered ones.

This is unless, of course, I somehow misunderstood your intentions.

blocks|key|19588|text|着色器本身是否可能“知道”屏幕分辨率是什么？|type|blockquote|depth|inlineStyleRanges|entityRanges|data|19589|我不这样认为。|unstyled|19590|对于着色器来说，控制单个物理像素呢？|19591|是。像素着色器知道它们正在绘制的像素，也可以对其他像素进行采样。|19592|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|M|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|N|8|@]|9|@]|A|$]]|$1|I|3|-4|5|D|7|O|8|@]|9|@]|A|$]]]|J|$]]

<blockquote>
 is it possible for the shader itself to "know" what the screen resolution is
</blockquote>

I don't think so.

<blockquote>
 and indeed for the shader to control single physical pixels?
</blockquote>

Yes. Pixel shaders know what pixel they are drawing and can also sample other pixels.

blocks|key|2045614|text|首先，请定义‘像素完美’和‘物理像素’。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2045615|如果物理像素指的是显示器的像素(显示器、笔记本显示器、任何其他可能使用的硬件)，那么你就倒霉了。着色器不是对那些操作，而是在它们自己的“抽象像素”上操作。|2045616|您可以这样想:您的图形是以某种可配置的分辨率(例如800x600像素)在图片中呈现的。您仍然可以在1920x1080的全屏上显示这张图片--没问题，它看起来很糟糕。这就是实际显示和显卡渲染所发生的情况。确定呈现像素的实际数量的是您的视频模式(在上面的示例中，图片的分辨率)。物理像素是显示器的像素。当呈现时，您只能对第一类操作。|2045617|这使我们得出一个结论，当您以与显示器的本机分辨率完全相同的分辨率呈现图形时，您可以安全地说，您将其呈现为“物理像素”。|2045618|统一地，您可以向呈现器传递一些外部数据(这可能包括当前屏幕分辨率(例如，作为Vector2，参见这)。但是，您很可能不需要这样做，因为像素着色器已经对像素进行操作(呈现像素，由您当前的视频模式决定)。这意味着，如果您使用的分辨率低于您的本地分辨率，您很可能无法呈现一个像素。|offset|length|2045619|希望能帮上忙。|2045620|entityMap|0|LINK|mutability|MUTABLE|url|http://answers.unity3d.com/questions/55402/how-to-pass-custom-variables-to-shaders.html^0|0|0|0|0|1C|1|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$J|10|K|11|1|12]]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

First of all, please define 'Pixel perfect' and 'Physical pixel'.

If by physical pixel you mean your display's pixel (monitor, laptop display, any other hardware you might use) then you are out of luck. Shaders don't operate on those, they operate on their own 'abstract pixels'.

You can think about it in this way:
 Your graphics are rendered in a picture with some configurable resolution (say 800x600 pixels). You can still display this picture on a 1920x1080 display in full screen no problem, it would look crappy though. This is what's happening with actual display and video card rendering. What determines the actual amount of rendered pixels is your video mode (picture's resolution in the above example). And physical pixels are your display's pixels. When rendering you can only operate on the first kind.

This leads us to a conclusion that when you render the graphics at the exact same resolution as your display's native resolution, you can safely say that you endeed render it as 'Physical Pixels'.

In unity, you can pass the renderer some external data (this might include your current screen resolution (for example as a Vector2, see <a href="http://answers.unity3d.com/questions/55402/how-to-pass-custom-variables-to-shaders.html" rel="nofollow">this</a>).
However you most likely don't need any of this, since pixel shaders already operate on pixels (rendered pixels, determined by your current video mode). That means that if you use some resolution which is lesser than your native one, you most likely will not be able to render a single pixel.

Hope it helped.

In Unity, when writing shaders,

is it possible for the shader itself to "know" what the screen resolution is, and indeed for the shader to control single physical pixels?

I'm thinking only of the case of writing shaders for 2D objects (such as for <code>UI</code> use, or at any event with an ortho camera).

(Of course, normally to show a physical-pixel perfect PNG on screen, you merely have a say 400 pixel PNG, and you arrange scaling so that the shader, happens to be drawing to, precisely 400 physical pixels. What I'm wondering about is a shader that just draws, for example a physical-pixel perfect black line - it would have to "know" exactly where the physical-pixels are.)

Pixel-perfect shader in Unity ShaderLab

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在“统一”中，当写着色器时，着色器本身是否有可能“知道”屏幕分辨率，以及着色器是否能够控制单个物理像素？我只考虑为2D对象编写着色器的情况(例如UI使用，或者在任何情况下都使用正畸相机)。(当然，通常要在屏幕上显示一个物理像素完美的PNG，你只需要一个400像素的PNG，你就会安排缩放，使着色器恰好绘制到400个物理像素。我想知道的是一个刚刚绘制的着色器，例如一条物理像素完美的黑线，它必须“知道”

问统一ShaderLab中的像素完美着色器
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