Texture2D ObjTexture;
SamplerState ObjSamplerState;

struct Light
{
    float3 dir;
    float4 ambient;
    float4 diffuse;
};

cbuffer cbPerFrame
{
    Light light;
};

cbuffer cbPerObject
{
    float4x4 WVP;
    float4x4 World;
};

struct VS_OUT
{
  float4 pos : SV_POSITION;
  float2 tex : TEXCOORD;
  float3 normal : NORMAL;
};


VS_OUT VS(float4 inPos : POSITION, float2 inTex : TEXCOORD, float3 inNormal : NORMAL )
{
	VS_OUT output;
    output.pos = mul(inPos, WVP);
	output.tex = inTex;
    output.normal = mul(inNormal, World);

	return output;
}

float4 PS(VS_OUT input) : SV_TARGET
{
    input.normal = normalize(input.normal);
    float4 diffRefl = ObjTexture.Sample(ObjSamplerState, input.tex);

    float3 col;

    col = diffRefl * light.ambient;
    col += saturate(dot(light.dir, input.normal) * light.diffuse * diffRefl);

    return float4(col, diffRefl.a);
}