Add the Basic Structure
=======================

Start by including the :file:`ReShade.fxh` header and defining a basic technique. At this stage, our pixel shader will simply return the original color of the game, serving as a starting point before we introduce any modifications.

.. code-block:: hlsl

    #include "ReShade.fxh"

    // Our pixel shader function will go here
    float3 PS_Grayscale(float4 vpos : SV_Position, float2 texcoord : TexCoord) : SV_Target
    {
        // For now, let's just return the original color
        float3 originalColor = tex2D(ReShade::BackBuffer, texcoord).rgb;
        return originalColor;
    }

    // Our technique
    technique MyGrayscaleEffect
    {
        pass
        {
            VertexShader = PostProcessVS; // Use the standard vertex shader
            PixelShader = PS_Grayscale;   // Use our pixel shader
        }
    }