0001: // ------------------------------------------------------------
0002: // 双３次フィルタ
0003: // 
0004: // Copyright (c) 2004 IMAGIRE Takashi. All rights reserved.
0005: // ------------------------------------------------------------
0006: 
0007: // ------------------------------------------------------------
0008: // テクスチャ
0009: // ------------------------------------------------------------
0010: sampler SrcSamp : register(s0);
0011: 
0012: float2 vSize;   // テクスチャサイズ
0013: float2 d2u;     // U座標を２テクセルずらす
0014: 
0015: // ------------------------------------------------------------
0016: // 頂点シェーダからピクセルシェーダに渡すデータ
0017: // ------------------------------------------------------------
0018: struct VS_OUTPUT
0019: {
0020:     float4 Pos          : POSITION;
0021:     float2 Tex0         : TEXCOORD0;
0022:     float2 Tex1         : TEXCOORD1;
0023:     float2 Tex2         : TEXCOORD2;
0024:     float2 Tex3         : TEXCOORD3;
0025:     float2 Tex4         : TEXCOORD4;
0026:     float2 Tex5         : TEXCOORD5;
0027:     float2 Tex6         : TEXCOORD6;
0028:     float2 Tex7         : TEXCOORD7;
0029: };
0030: 
0031: // ------------------------------------------------------------
0032: // ピクセルシェーダプログラム
0033: // ------------------------------------------------------------
0034: float4 PS (VS_OUTPUT In) : COLOR
0035: {   
0036: #if 0
0037:     // Catmull-Rom patch
0038:     const float4 w3 = float4(-0.5, 1.5,-1.5, 0.5);
0039:     const float4 w2 = float4( 1.0,-2.5, 2.0,-0.5);
0040:     const float4 w1 = float4(-0.5, 0.0, 0.5, 0.0);
0041:     const float4 w0 = float4( 0.0, 1.0, 0.0, 0.0);
0042: #else
0043:     const float4 w3 = float4(-1, 1,-1, 1);
0044:     const float4 w2 = float4( 2,-2, 1,-1);
0045:     const float4 w1 = float4(-1, 0, 1, 0);
0046:     const float4 w0 = float4( 0, 1, 0, 0);
0047: #endif
0048:     
0049:     float2 fUV = frac (In.Tex5 * vSize);    // サブテクセルを0～1のパラメータ化
0050:     float2 fUV2 = fUV * fUV;                // fUV の２乗
0051:     float2 fUV3 = fUV * fUV2;               // fUV の３乗
0052:     float4 u, v;
0053:     u = fUV3.x * w3 + fUV2.x * w2 + fUV.x * w1 + w0;
0054:     v = fUV3.y * w3 + fUV2.y * w2 + fUV.y * w1 + w0;
0055:     
0056:     // テクスチャから少しずらしてサンプリング
0057:     float4 col00 = tex2D( SrcSamp, In.Tex0 );
0058:     float4 col01 = tex2D( SrcSamp, In.Tex1 );
0059:     float4 col02 = tex2D( SrcSamp, In.Tex2 );
0060:     float4 col03 = tex2D( SrcSamp, In.Tex3 );
0061: 
0062:     float4 col10 = tex2D( SrcSamp, In.Tex4 );
0063:     float4 col11 = tex2D( SrcSamp, In.Tex5 );
0064:     float4 col12 = tex2D( SrcSamp, In.Tex6 );
0065:     float4 col13 = tex2D( SrcSamp, In.Tex7 );
0066: 
0067:     float4 col20 = tex2D( SrcSamp, In.Tex0 + d2u );
0068:     float4 col21 = tex2D( SrcSamp, In.Tex1 + d2u );
0069:     float4 col22 = tex2D( SrcSamp, In.Tex2 + d2u );
0070:     float4 col23 = tex2D( SrcSamp, In.Tex3 + d2u );
0071: 
0072:     float4 col30 = tex2D( SrcSamp, In.Tex4 + d2u );
0073:     float4 col31 = tex2D( SrcSamp, In.Tex5 + d2u );
0074:     float4 col32 = tex2D( SrcSamp, In.Tex6 + d2u );
0075:     float4 col33 = tex2D( SrcSamp, In.Tex7 + d2u );
0076: 
0077:     
0078:     float4 col0 = u.x * col00 + u.y * col10 + u.z * col20 + u.w * col30;
0079:     float4 col1 = u.x * col01 + u.y * col11 + u.z * col21 + u.w * col31;
0080:     float4 col2 = u.x * col02 + u.y * col12 + u.z * col22 + u.w * col32;
0081:     float4 col3 = u.x * col03 + u.y * col13 + u.z * col23 + u.w * col33;
0082:     
0083:     return v.x * col0 + v.y * col1 + v.z * col2 + v.w * col3;
0084: }
0085: // ------------------------------------------------------------
0086: // テクニック
0087: // ------------------------------------------------------------
0088: technique TShader
0089: {
0090:     pass P0
0091:     {
0092:         // シェーダ
0093:         PixelShader  = compile ps_2_0 PS();
0094:     }
0095: }
0096: