// ワールドビュー射影変換行列宣言
float4x4 matWorldViewProj;
texture gTexture : TEXTURE0;

//テクスチャのサンプリング方法
sampler tex0 = sampler_state 
{
  Texture = <gTexture>;
  MinFilter = NONE;
  MagFilter = NONE;
  MipFilter = NONE;
  AddressU = Clamp;
  AddressV = Clamp;
}; 

float4 gRed = {1.0f,0.0f,0.0f,1.0f};

//頂点シェーダの出力出力定義
struct VS_OUTPUT
{
  float4 Pos : POSITION;
  float4 Diffuse : COLOR0;
  float2 TexUV : TEXCOORD0;
};

// ピクセルシェーダー入力
struct PS_INPUT {
  float4 Col : COLOR0;
  float2 TexUV : TEXCOORD0;
}; 

// 頂点シェーダ
VS_OUTPUT BasicTransform(
  float4 lPos : POSITION,
  float4 aDiffuse : COLOR0,
  float2 vTexCoord0 : TEXCOORD0
)
{
  VS_OUTPUT Out;

  Out.Pos = mul(lPos, matWorldViewProj);
  Out.TexUV = vTexCoord0;
  Out.Diffuse = aDiffuse;

  return Out;
}

// ピクセルシェーダ
float4 TexPixelShader(PS_INPUT In) : COLOR0
{
  return gRed * tex2D(tex0, In.TexUV);
}

// ピクセルシェーダ(モノクロ化)
float4 TexPixelShaderMono(VS_OUTPUT In) : COLOR0
{
  float4 Out;

  float4 color = tex2D(tex0, In.TexUV ) * In.Diffuse;
  float4 tomono = float4(0.298912, 0.586611, 0.114478, 0.0);
  Out = dot(color, tomono);
  
  Out.w = color.w;

  return Out;
}

technique BasicTec
{
  pass P0
  {
    VertexShader = compile vs_2_0 BasicTransform();
    PixelShader = compile ps_2_0 TexPixelShader();
  }
   
  pass P1
  {
    VertexShader = compile vs_2_0 BasicTransform();
    PixelShader = compile ps_2_0 TexPixelShaderMono();
  }
}