Sampling from Normal Map and Diffuse Map in Pixel Shader

Question

I'm having some issue changing a basic lighting shader to take a normal texture and a diffuse texture for a model and then using the normal texture for lighting. The code is very simple and i can't see where i have gone wrong at all, am i not allowed to sample two textures with the same sampler? This is the output i am getting:

Using the two textures:

THe basic shader code is:

Texture2D shaderTexture : register(t0);
Texture2D heightNormalTexture : register(t1);

    float4 PS(VOUT pIn) : SV_Target
{
    float4 diffuseColour = shaderTexture.Sample(SampleType, pIn.texCoord);
    float4 normal = heightNormalTexture.Sample(SampleType, pIn.texCoord);

    float3 litColour = float3(0.0f, 0.0f, 0.0f);

    for(int i = 0; i < 3; i++)
    {
        SurfaceInfo sInfo = {pIn.posW, normal.xyz, diffuseColour, pIn.spec};
        [branch] switch(gLight[i].type)
        {
            case 0: //Parallel
            {
                litColour += ParallelLight(sInfo, gLight[i], gEyePosW);//
                break;
            }
            case 1: //Point
            {
                litColour += PointLight(sInfo, gLight[i], gEyePosW);
                break;
            }
            case 2: //Spotlight
            {
                //litColour += SpotLight(sInfo, gLight[i], gEyePosW);
                break;
            }
        }
    }
    return float4(litColour, diffuseColour.a);
}

The lighting code seems to work just fine when i pass in the normals as part of the vertex buffer, but goes this odd mash-up of diffuse and normal when i try to use the normals from a texture. From what i can tell i am setting the texture right in C++.

    ID3D11ShaderResourceView *pixelShaderTextures[2];
pixelShaderTextures[0] = m_textureManager.GetTextureResourceView(std::string("TestHeightMapNormal"));
pixelShaderTextures[1] = m_textureManager.GetTextureResourceView(std::string("TestTexture"));

context->PSSetShaderResources(0, 2, pixelShaderTextures);

If you guys have any help/advice for me to resolve this, that would be great.

Answer 1

I've not touched DX11, but in the shader you seem to expect sampler 0 to be the diffuse, with sampler 1 to be the normal map. When you set the textures on the C++ side, you seem to have the slots reversed from what I can see.