模糊算法 Blur

// 均值模糊
// float2         UV          UV
// TextureObject  Texture     纹理对象
// float2         TexSize     图片大小，比如float2(512,512)
// float2         BlurCore    模糊大小，比如float2(5,5)
int2 UVOfferBegin = ceil(BlurCore / -2);
float3 OutColor={0.0, 0.0, 0.0};
for(int i = 0; i < BlurCore.y; i++)
    for(int j = 0; j < BlurCore.x; j++) {
        OutColor += Texture2DSample(Texture, TextureSampler, UV + float2((UVOfferBegin.x + j) / TexSize.x, (UVOfferBegin.y + i) / TexSize.y));
    }
return float4(OutColor / BlurCore.x / BlurCore.y, 1.0f);

// 5x5高斯模糊
// float2           UV      贴图UV
// TextureObject    Texture 纹理对象
// float2           TexSize 图片大小，比如float2(512,512)
int UVOfferset[] = {-2, -1, 0, 1, 2};
float Weights[] =
{
    0.0036,0.0146,0.0256,0.0146,0.0036,
    0.0146,0.0586,0.0952,0.0586,0.0146,
    0.0256,0.0952,0.1501,0.0952,0.0256,
    0.0146,0.0586,0.0952,0.0586,0.0146,
    0.0036,0.0146,0.0256,0.0146,0.0036
};
float3 OutColor = {0.0, 0.0, 0.0};
for(int i = 0; i < 5; i++)
    for(int j = 0; j < 5; j++)
        OutColor += Weights[i * 5 + j] * Texture2DSample(Texture, TextureSampler, UV + float2(UVOfferset[j] / TexSize.x, UVOfferset[i] / TexSize.y));
return float4(OutColor, 1.0f);