// BLENDFX.fx  - mixes two textures 50% each

// Light direction (view space)
float3 LightDir < string UIDirectional = "Light Direction"; > = 
    normalize(float3(0.5, -0.5, 0)); 


// Light intensity
float4 I_a = { 0.0f, 0.0f, 0.0f, 1.0f };    // ambient
float4 I_d = { 1.0f, 1.0f, 1.0f, 1.0f };    // diffuse


// Material reflectivity
float4 k_a : MATERIALAMBIENT = { 1.0f, 1.0f, 1.0f, 1.0f };    // ambient
float4 k_d : MATERIALDIFFUSE = { 1.0f, 1.0f, 1.0f, 1.0f };    // diffuse

// Texture
texture Tex0;
texture Tex1;

// Transformations
float4x4 WorldView  : WORLD;
float4x4 Projection : PROJECTION;

struct VS_OUTPUT
{
    float4 Pos  : POSITION;
    float4 Diff : COLOR0;
  //  float4 Spec : COLOR1;
    float2 Tex0 : TEXCOORD0;
    float2 Tex1 : TEXCOORD1;
};

VS_OUTPUT VS(
    float3 Pos  : POSITION, 
    float3 Norm : NORMAL, 
    float2 Tex0 : TEXCOORD0,
    float2 Tex1 : TEXCOORD1)
{
    VS_OUTPUT Out = (VS_OUTPUT)0;

    float3 L = -LightDir;

    float3 P = mul(float4(Pos, 1), (float4x3)WorldView);  // position (view space)
    float3 N = normalize(mul(Norm, (float3x3)WorldView)); // normal (view space)

    Out.Pos  = mul(float4(P, 1), Projection);             // position (projected)
    Out.Diff = I_a * k_a + I_d * k_d * max(0, dot(N, L)); // diffuse + ambient
    Out.Tex0 = Tex0;                                       
    Out.Tex1 = Tex1;                                       

    return Out;
}

sampler Sampler0 = sampler_state
{
    Texture   = (Tex0);
    MipFilter = LINEAR;
    MinFilter = LINEAR;
    MagFilter = LINEAR;
};
sampler Sampler1 = sampler_state
{
    Texture   = (Tex1);
    MipFilter = LINEAR;
    MinFilter = LINEAR;
    MagFilter = LINEAR;
};

float4 PS(
    float4 Diff : COLOR0,
    float2 Tex0 : TEXCOORD0,
    float2 Tex1 : TEXCOORD1 ) : COLOR
{
	float4 color0 = tex2D(Sampler0, Tex0) * 0.5;
	float4 color1 = tex2D(Sampler1, Tex1) * 0.5;
	float4 OutColor = (color0 + color1 ) * diff;
 
    return OutColor;
}


technique tVertexAndPixelShader
{
    pass P0
    {
		CullMode     = CCW;
        
        // Shaders
        VertexShader = compile vs_1_1 VS();
        PixelShader  = compile ps_1_1 PS();
    }  
}