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R8G8B8A8 texture format in Compute Shader

4 posts in this topic

Hey,

I wanna use a 32-bit R8G8B8A8 texture format. I want to write data to it in compute shader and then read that data in pixel shader, but I can't get it working at all. First of all I cannot use format like DXGI_FORMAT_R8G8B8A8_UNORM because it's not possible to specify appropriate RWTexture2D in compute shader. So I decided to use DXGI_FORMAT_R8G8B8A8_UINT format, pack by 8-bit components to that in compute, and read in pixel shader. No success.

Packing code:
[code]
RWTexture2D<uint> texture: register(u0);

[numthreads(16, 16, 1)]
void main(uint3 dtID: SV_DispatchThreadID)
{
uint r = 255;
uint g = 255 << 8;
uint b = 255 << 16;
uint a = 255 << 24;
texture[int2(dtID.x, dtID.y)] = r | g | b | a;
}
[/code]

Unpacking code:
[code]
...

PS_OUTPUT main(PS_INPUT input)
{
PS_OUTPUT output;

uint value = texture.Load(int3(0, 0, 0));
uint r = (value & 0x000000FF);
uint g = (value & 0x0000FF00) >> 8;
uint b = (value & 0x00FF0000) >> 16;
uint a = (value & 0xFF000000) >> 24;

output.color = float4(r, g, b, a) / 255.0f;

return output;
}
[/code]

Is there anything wrong I'm doing? Isn't there a simple way for four 8-bit components treatment in compute shaders?
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Try changing the format from [color=#1C2837][size=2]DXGI_FORMAT_R8G8B8A8_UINT to DXGI_FORMAT_R32_UINT, since you declare your texture as a uint in the shader.[/size][/color]
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If you just want to write to a R8G8B8A8_UNORM through a UAV, you can do that and it works fine. Just declare a RWTexture2D<float4>, and write float4's to the texture. However you can't read the values through a UAV, only through a SRV. If you need to read and write in the same shader, the workaround is to use R32_UINT, and then use the functions in [url="http://msdn.microsoft.com/en-us/library/ff728749%28v=vs.85%29.aspx"]D3DX_DXGIFormatConvert.inl[/url] to manually pack and unpack the values.
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Guys... THANK YOU! It was driving me crazy and all your ideas worked!
Obviously, for packing I needed R32_UINT rather than R8G8B8A8_UINT - thanks n3Xus! And to answer question of Bearish Sun, I got red color. What is obvious as I was writing to this one channel only.
And finally thank MJP for that float4. Actually I could have guessed that since UNORM is... well... normalized format. I'm aware of that compute shader write/read restriction, just couldn't get that writing in CS and reading in PS right ;).
Again, thank you guys!
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