//**************************************************************************************//
//                                            //
//                BASIC STUFF                        //
//        SOME WITH A + D + S (PER-VERTEX)                    //
//                                            //
//**************************************************************************************//


void Tiny_vp    (float4 position : POSITION,
      
          out float4 oPosition : POSITION, 

          uniform float4x4 worldViewProj)
{
    oPosition = mul(worldViewProj, position);
}

void OneTexture_vp(float4 position : POSITION,
          float2 uv          : TEXCOORD0,
      
          out float4 oPosition : POSITION,
          out float2 oUv       : TEXCOORD0, 

          uniform float4x4 worldViewProj,
          uniform float scale)
{
    oPosition = mul(worldViewProj, position);
    oUv = uv * scale;
}

void Ambient_vp(float4 position : POSITION, 

          out float4 oPosition : POSITION,
          out float4 colour    : COLOR,

          uniform float4x4 worldViewProj,
          uniform float4 ambient)
{
    oPosition = mul(worldViewProj, position);
    colour = ambient;
} 

void AmbientOneTexture_vp(float4 position : POSITION,
              float2 uv          : TEXCOORD0,
                      
              out float4 oPosition : POSITION,
              out float2 oUv       : TEXCOORD0,
              out float4 colour    : COLOR,

              uniform float4x4 worldViewProj,
              uniform float4 ambient)
{
    oPosition = mul(worldViewProj, position);
    oUv = uv;
    colour = ambient;
}

void PerVertex_Vert (    float4 position : POSITION,
            float3 normal   : NORMAL,

            uniform float4 lightPosition,
            uniform float3 eyePosition,
            uniform float4x4 worldviewproj,

            uniform float4 lightDiffuse,
            uniform float4 lightSpecular,
            uniform float exponent, 

            out float4 oColor : COLOR,
            out float4 oPos : POSITION
        ) 
{
    oPos = mul(worldviewproj, position);
    
    float3 EyeDir = normalize(eyePosition - position.xyz);

    float3 LightDir = normalize(lightPosition.xyz -  (position.xyz * lightPosition.w)); 

    float3 HalfAngle   = normalize(LightDir + EyeDir);

    float3 N = normalize(normal);

    float NdotL = dot(N, LightDir);
    float NdotH = dot(N, HalfAngle);
    float4 Lit = lit(NdotL,NdotH,exponent);
    oColor = lightDiffuse * Lit.y + lightSpecular * Lit.z;    
}