c# - Monogame 着色器移植问题

Question

好的，所以我将我一直在开发的游戏移植到 Monogame，但是现在移植后我遇到了着色器问题。这是一个奇怪的错误，因为它适用于我的旧 XNA 项目，而且我第一次在新的 monogame 项目中使用它时它也适用，但之后就不行了，除非我重新启动游戏。

着色器是一个非常简单的着色器，它查看灰度图像，并根据灰色从查找纹理中选择颜色。基本上，每次在屏幕上放置一个新敌人时，我都会使用它来随机化一个敌人的 Sprite 图像。它在第一次生成敌人时起作用，但之后不起作用，只是给出一个完全透明的纹理(不是空纹理)。

此外，我目前只针对 Windows 桌面，但我计划在某个时候针对 Mac 和 Linux。

这是着色器代码本身。

sampler input : register(s0);
Texture2D colorTable;
float seed; //calculate in program, pass to shader (between 0 and 1)

sampler colorTableSampler = 
sampler_state
{
    Texture = <colorTable>;
};

float4 PixelShaderFunction(float2 c: TEXCOORD0) : COLOR0
{
    //get current pixel of the texture (greyscale)
    float4 color = tex2D(input, c);
    //set the values to compare to.
    float hair = 139/255; float hairless = 140/255;
    float shirt = 181/255; float shirtless = 182/255;
    //var to hold new color
    float4 swap;
    //pixel coordinate for lookup
    float2 i;
    i.y = 1;

    //compare and swap
    if (color.r >= hair && color.r <= hairless)
    {
        i.x = ((0.5 + seed + 96)/128);
        swap = tex2D(colorTableSampler,i);
    }
    if (color.r >= shirt && color.r <= shirtless)
    {
        i.x = ((0.5 + seed + 64)/128);
        swap = tex2D(colorTableSampler,i);
    }
    if (color.r == 1)
    {
        i.x = ((0.5 + seed + 32)/128);
        swap = tex2D(colorTableSampler,i);
    }
    if (color.r == 0)
    {
        i.x = ((0.5 + seed)/128);
        swap = tex2D(colorTableSampler, i);
    }

    return swap;
}

technique ColorSwap
{
    pass Pass1
    {
        // TODO: set renderstates here.

        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

这里是创建纹理的函数。我还应该注意到，纹理生成在没有着色器的情况下也能正常工作，我只得到灰度基础图像。

public static Texture2D createEnemyTexture(GraphicsDevice gd, SpriteBatch sb)
        {
            //get a random number to pass into the shader.
            Random r = new Random();
            float seed = (float)r.Next(0, 32);
            //create the texture to copy color data into
            Texture2D enemyTex = new Texture2D(gd, CHARACTER_SIDE, CHARACTER_SIDE);
            //create a render target to draw a character to.
            RenderTarget2D rendTarget = new RenderTarget2D(gd, CHARACTER_SIDE, CHARACTER_SIDE,
                false, gd.PresentationParameters.BackBufferFormat, DepthFormat.None);
            gd.SetRenderTarget(rendTarget);
            //set background of new render target to transparent.
            //gd.Clear(Microsoft.Xna.Framework.Color.Black);
            //start drawing to the new render target
            sb.Begin(SpriteSortMode.Immediate, BlendState.Opaque,
                    SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullNone);
            //send the random value to the shader.
            Graphics.GlobalGfx.colorSwapEffect.Parameters["seed"].SetValue(seed);
            //send the palette texture to the shader.            
            Graphics.GlobalGfx.colorSwapEffect.Parameters["colorTable"].SetValue(Graphics.GlobalGfx.palette);
            //apply the effect
            Graphics.GlobalGfx.colorSwapEffect.CurrentTechnique.Passes[0].Apply();
            //draw the texture (now with color!)
            sb.Draw(enemyBase, new Microsoft.Xna.Framework.Vector2(0, 0), Microsoft.Xna.Framework.Color.White);
            //end drawing
            sb.End();
            //reset rendertarget
            gd.SetRenderTarget(null);
            //copy the drawn and colored enemy to a non-volitile texture (instead of render target)
            //create the color array the size of the texture.
            Color[] cs = new Color[CHARACTER_SIDE * CHARACTER_SIDE];
            //get all color data from the render target
            rendTarget.GetData<Color>(cs);
            //move the color data into the texture.
            enemyTex.SetData<Color>(cs);
            //return the finished texture.
            return enemyTex;
        }

为了以防万一，在着色器中加载的代码:

BinaryReader Reader = new BinaryReader(File.Open(@"Content\\shaders\\test.mgfx", FileMode.Open));
colorSwapEffect = new Effect(gd, Reader.ReadBytes((int)Reader.BaseStream.Length));

如果有人有解决此问题的想法，我将不胜感激，如果您需要有关该问题的其他信息，请告诉我。

Answer 1

我不确定为什么在转义反斜杠时在字符串前面有“at”(@) 符号 - 除非你想在字符串中包含\\，但它在文件路径中看起来很奇怪。

您在代码中写道:

BinaryReader Reader = new BinaryReader(File.Open(@"Content\\shaders\\test.mgfx", FileMode.Open));

除非你想在字符串中使用\\

BinaryReader Reader = new BinaryReader(File.Open(@"Content\shaders\test.mgfx", FileMode.Open));

或

BinaryReader Reader = new BinaryReader(File.Open("Content\\shaders\\test.mgfx", FileMode.Open));

但不要同时使用。