HLSL 3可以单独声明像素着色器吗? [英] HLSL 3 Can a Pixel Shader be declared alone?

问题描述

我被要求将以下问题分为多个问题:

I've been asked to split the question below into multiple questions:

HLSL和Pix问题数

这是第一个问题，我可以在HLSL 3中运行没有顶点着色器的像素着色器吗?在HLSL 2中，我注意到您可以，但似乎无法在3中找到方法?

This is asking the first question, can I in HLSL 3 run a pixel shader without a vertex shader. In HLSL 2 I notice you can but I can't seem to find a way in 3?

着色器可以很好地编译，但是当我调用SpriteBatch Draw()时，我将从Visual Studio中得到此错误.

The shader will compile fine, I will then however get this error from Visual Studio when calling SpriteBatch Draw().

不能将着色器模型3.0与早期的着色器模型混合使用.如果将顶点着色器或像素着色器中的任何一个编译为3.0，则必须两者都使用."

"Cannot mix shader model 3.0 with earlier shader models. If either the vertex shader or pixel shader is compiled as 3.0, they must both be."

我不相信我已经在着色器中定义了任何东西来早于3.所以我有些困惑.任何帮助将不胜感激.

I don't believe I've defined anything in the shader to use anything earlier then 3. So I'm left a bit confused. Any help would be appreciated.

推荐答案

问题是内置的SpriteBatch着色器为2.0.如果仅指定像素着色器，则SpriteBatch仍将使用其内置的顶点着色器.因此版本不匹配.

The problem is that the built-in SpriteBatch shader is 2.0. If you specify a pixel shader only, SpriteBatch still uses its built-in vertex shader. Hence the version mismatch.

那么，解决方案就是自己指定一个顶点着色器.幸运的是，Microsoft为XNA的内置着色器提供了来源 .它所涉及的只是一个矩阵变换.这是经过修改的代码，因此您可以直接使用它:

The solution, then, is to also specify a vertex shader yourself. Fortunately Microsoft provides the source to XNA's built-in shaders. All it involves is a matrix transformation. Here's the code, modified so you can use it directly:

float4x4 MatrixTransform;

void SpriteVertexShader(inout float4 color    : COLOR0,
                        inout float2 texCoord : TEXCOORD0,
                        inout float4 position : SV_Position)
{
    position = mul(position, MatrixTransform);
}

然后-因为SpriteBatch不会为您设置-正确设置效果的MatrixTransform.这是对客户端"空间的简单投影(来自

And then - because SpriteBatch won't set it for you - setting your effect's MatrixTransform correctly. It's a simple projection of "client" space (source from this blog post). Here's the code:

Matrix projection = Matrix.CreateOrthographicOffCenter(0, 
        GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height, 0, 0, 1);
Matrix halfPixelOffset = Matrix.CreateTranslation(-0.5f, -0.5f, 0);
effect.Parameters["MatrixTransform"].SetValue(halfPixelOffset * projection);

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