Question

我花了好几个小时在VB中寻找高斯模糊函数来模糊texture2Ds。我找不到一个，所以我在博客文章和朋友的帮助下自己做了一个。在这里，对于你们中的任何人来说（我知道这不是一个问题，但它应该有希望帮助你们中的一些人）

Public Shared Function blurImage(p As player, img As Texture2D, sb As SpriteBatch, Optional radius As Integer = 2, Optional amount As Single = 1.0F) As Texture2D
    Dim sigma As Single = radius / amount : Dim kernel As Single() = New Single(radius * 2) {} : Dim index As Integer = 0
    Dim twoSigmaSquare As Single = 2.0F * sigma * sigma : Dim sigmaRoot As Single = CSng(Math.Sqrt(twoSigmaSquare * Math.PI))
    Dim offsetsHoriz As Vector2() = New Vector2(radius * 2) {} : Dim offsetsVert As Vector2() = New Vector2(radius * 2) {}
    Dim effect As Effect = content.Load(Of Effect)("Effects\GaussianBlur")

    For i As Integer = -radius To radius
        index = i + radius
        offsetsHoriz(index) = New Vector2(i * 1.0F / img.Width, 0F)
        offsetsVert(index) = New Vector2(0F, i * 1.0F / img.Height)
    Next

    Dim total As Single = 0F : Dim distance As Single = 0F : index = 0
    For i As Integer = -radius To radius
        distance = i * i : index = i + radius
        kernel(index) = CSng(Math.Exp(-distance / twoSigmaSquare)) / sigmaRoot
        total += kernel(index)
    Next
    For i As Integer = 0 To kernel.Length - 1 : kernel(i) /= total : Next

    Dim renderTarget1 As Texture2D = New RenderTarget2D(Game.graphics.GraphicsDevice, img.Width, img.Height, False, Game.graphics.GraphicsDevice.PresentationParameters.BackBufferFormat, DepthFormat.None)
    Dim renderTarget2 As Texture2D = New RenderTarget2D(Game.graphics.GraphicsDevice, img.Width, img.Height, False, Game.graphics.GraphicsDevice.PresentationParameters.BackBufferFormat, DepthFormat.None)

    If effect Is Nothing Then Throw New InvalidOperationException("GaussianBlur.fx effect not loaded.")

    Dim outputTexture As Texture2D = Nothing
    Dim srcRect As New Rectangle(0, 0, img.Width, img.Height)
    Dim destRect1 As New Rectangle(0, 0, renderTarget1.Width, renderTarget1.Height)
    Dim destRect2 As New Rectangle(0, 0, renderTarget2.Width, renderTarget2.Height)

    Game.graphics.GraphicsDevice.SetRenderTarget(renderTarget1)

    effect.CurrentTechnique = effect.Techniques("GaussianBlur")
    effect.Parameters("weights").SetValue(kernel)
    effect.Parameters("colorMapTexture").SetValue(img)
    effect.Parameters("offsets").SetValue(offsetsHoriz)

    sb.Begin(0, BlendState.Opaque, Nothing, Nothing, Nothing, effect)
    sb.Draw(img, destRect1, Color.White)
    sb.[End]()

    Game.graphics.GraphicsDevice.SetRenderTarget(renderTarget2)
    outputTexture = DirectCast(renderTarget1, Texture2D)

    effect.Parameters("colorMapTexture").SetValue(outputTexture)
    effect.Parameters("offsets").SetValue(offsetsVert)

    sb.Begin(0, BlendState.Opaque, Nothing, Nothing, Nothing, effect)
    sb.Draw(outputTexture, destRect2, Color.White)
    sb.End()

    Game.graphics.GraphicsDevice.SetRenderTarget(Nothing)
    outputTexture = DirectCast(renderTarget2, Texture2D)

    Return outputTexture
End Function

Visual Basic XNA高斯模糊函数

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