好的，所以我将我一直在开发的游戏移植到 Monogame，但是现在我遇到了着色器问题，因为它已经移植了。这是一个奇怪的错误，因为它适用于我的旧 XNA 项目，并且在我第一次在新的 monogame 项目中使用它时也适用，但在那之后除非我重新启动游戏，否则它不会。
着色器是一个非常简单的着色器，它查看灰度图像，并根据灰度从查找纹理中选择一种颜色。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精灵图像。它在第一次生成敌人时起作用，但在那之后就不起作用了，只是给出一个完全透明的纹理（不是空纹理）。
此外，我现在只针对 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();
}
}
这是创建纹理的函数。我还应该注意，在没有着色器的情况下，纹理生成工作正常，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。