DirectX: ShadowMap becomes empty if 'discard' is used in shadow pass

Zansin · 2020-05-12T19:32:48

Following the tutorial in msdn: https://docs.microsoft.com/en-us/windows/uwp/gaming/render-the-shadow-map-to-the-depth-buffer The above link is Step 2. You can go to Step 1 if you want from the links to the left in from the above link. Anyways, it says the following: “The output of this shader is thrown away; it can call discard on every pixel.” But when I do discard, when I check the graphics debugger and check the shadow map resource, this happens: But if I use return input.pos.z / input.pos.w in the pixel shader in the shadow render pass, I get this in the shader resource view: It results that when I then sample from the ShadowMap, I can detect whether a pixel should be bright or shadowed. I understand then that of course, since I return a value in the pixel shader, it gets filled with pixel values. That makes sense. So why does MSDN write that “it can call discard” for?I've sampled the ShadowMap as they wrote in Step 3 like this but with modifications: lighting = float(shadowMap.SampleCmpLevelZero( shadowSampler, shadowTexCoords, pixelDepth + epsilon ) ); if(lighting > 0) { return 1; } return 0; It works as said above, when I return in the pixel shader. So the question again,why is MSDN saying that “discard” can be used?

Graphics and GPU Programming Programming

Started by Zansin May 12, 2020 04:25 PM

11 comments, last by Calin 4 years, 8 months ago

Zansin

Author

May 12, 2020 07:05 PM

Lol, I haven't come so far to even use compute shader so good luck xD.

Btw for anyone following this, Setting Pixel Shader to nullptr apparently gives me the value I want, which I mean it renders to depth stencil.

Looks like discard also discards depth value too for some reason. Still gonna keep research this as I still want Pixel shader (for the drivers sake. Damit!).

Calin

464

May 12, 2020 07:32 PM

sorry posted by mistake in the wrong thread

My project`s facebook page is “DreamLand Page”

DirectX: ShadowMap becomes empty if 'discard' is used in shadow pass

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DirectX: ShadowMap becomes empty if 'discard' is used in shadow pass

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