How to implements post effect with compute shader?

[nanophoto]

Ogre Version: 14.1.0
Operating System: Windows 10
Render System: Direct3D11

Code: Select all

compositor GrayScale
{
    technique
    {
        texture rt0 target_width target_height PF_FLOAT32_RGBA
        texture rt1 target_width target_height PF_FLOAT32_RGBA

    target rt0
    {
        //After drawing geometries.
        input previous
    }

    target rt1
    {
        //For example, I want to implements color-gray convertion with compute shader
        input none
        pass compute
        {
            material ComputeShader/GrayScale
            thread_groups 32 32 1
            input 0 rt0
            input 1 rt1
        }
    }

    target_output
    {
        input none
        pass render_quad
        {
            //simply draw quad.
            material RenderQuad
            input 0 rt1
        }
    }
}
}

I want to implements post effect with direct3d11 compute shader.
And I read Sample_Compute example.
However I cannot understand how to write compositor to execute post effect with compute shader.

In the example above, I would like to perform Gaussian blur or grayscale conversion etc... after drawing other geometry. It is possible with the traditional Compositor example, but I'd like to know how to implements it with Compute Shader.

Best regards.

[paroj]

pass compute merely tells when to execute the compute shader relative to the rest.
Compute shaders themselves are not part of the rendering pipeline, so it does not matter which target section they belong to. You reference the data you want to process in the material.
See also: https://github.com/OGRECave/ogre/blob/6 ... #L783-L792

[nanophoto]

Thank you, paroj.
I will try to rewrite the script based on the information you provided.