warning x3206 implicit truncation of vector type

Graphics
4

// plain old grey scale is this.

float4 Color = tex2D(TextureSampler, Tex);
Color.rgb = (Color.r + Color.g + Color.b) / 3.0f;
return Color;

// the magic values are just supposed to make it look better.

Color.rgb = Color.rgb * float3(0.7f, 0.59f, 0.11f);
Color.rgb = (Color.r + Color.g + Color.b) * 0.333f;

As for the texture it’ s probably just simpler to have you look at a full shader used with spritebatch.

At the least you need to have your pixel shader input match the vertex shader output

struct VertexShaderOutput
{
    float4 Position : SV_Position;
    float4 Color : COLOR0;
    float2 TexureCoordinate : TEXCOORD0;
}

PixelShaderOutput PixelShaderFunction(VertexShaderOutput input)
{
    PixelShaderOutput output;
    float4 col = tex2D(TextureSampler, input.TexureCoordinate) * input.Color;

// ect...
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