Drawing depth buffer in pixel shader

Ajith K · 2016-01-18T19:45:35

Hi everyone, I am trying to draw depth info of a scene into a texture bound as a UAV in pixel shader. I did not bind either render target or depth stencil target. Btw my shader model is 5.0 Below is the pixel shader i used (struct PS_IN not shown for simplicity ) RWTexture2D tex : register(u0) void PS(PS_IN input) { if ( tex[uint(input.pos.xy)] >= input.pos.z ) tex[uint(input.pos.xy)] = input.pos.z; } After clearing UAV with float4(1,1,1,1) and binding UAV with OMSetRenderTargetAndUnorderedAccessViews (0,NULL,NULL,0,1,&uav_view,NULL ), I drew the scene. The program crashed promptly and I am not at all surprised :D I have a couple of doubts. 1. Is that the correct way to use [] operator?(If it is, I have to look somewhere else for bug causing the crash) If operator [] can do both read and write, doesn't that make Load function redundant. 2. This question occurred to me while I was posting this. My UAV texture is 512x512 size. How does Direct3D know to invoke pixel shader 512*512 times. I haven't bound the render target at all. I am not sure if my question makes any sense in the first place.

Graphics and GPU Programming Programming

Started by ajithk January 18, 2016 07:16 AM

10 comments, last by ajithk 8 years, 3 months ago

unbird

8,359

January 18, 2016 03:12 PM

Check the D3D debug layer output and/or with a graphics debugger if your resources are actually bound correctly. Other bugs aside it's usually a read/write hazard: One has to explicitly unbind resources before binding it elsewhere otherwise the API will nullify such an attempt (but report it in the debug layer).

PS: The debug layer is enabled with D3D11_CREATE_DEVICE_DEBUG at device creation.

ajithk

158

Author

January 18, 2016 07:45 PM

Hey! I got it working. Direct3D 11.0 will allow simultaneous read/write in either pixel or compute shader with only DXGI_FORMAT_R32_UINT. (Also, see the comment at the bottom of the page in the link). I din't knew this stuff.

https://msdn.microsoft.com/en-us/library/ff728749(v=vs.85).aspx

Drawing depth buffer in pixel shader

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Drawing depth buffer in pixel shader

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