Sharpdx 动态纹理更新不正确

Question

这是使用 SharpDX 4.0 的 C# WPF。

我正在尝试使用从库生成的颜色缓冲区在每个渲染循环中更新动态纹理。我发现生成的纹理与预期位图不匹配的问题。纹理似乎比预期的要宽或格式比预期的要大。

var surfaceWidth = 200; var surfaceHeight = 200; 
var pixelBytes = surfaceWidth * surfaceHeight * 4;

//Set up the color buffer and byte array to stream to the texture
_colorBuffer = new int[surfaceWidth * surfaceHeight]; 
_textureStreamBytes = new byte[pixelBytes]; //16000 length

//Create the texture to update
_scanTexture = new Texture2D(Device, new Texture2DDescription()
        {
            Format = Format.B8G8R8A8_UNorm,
            ArraySize = 1,
            MipLevels = 1,
            Width = SurfaceWidth,
            Height = SurfaceHeight,
            SampleDescription = new SampleDescription(1, 0),
            Usage = ResourceUsage.Dynamic,
            BindFlags = BindFlags.ShaderResource,
            CpuAccessFlags = CpuAccessFlags.Write,
            OptionFlags = ResourceOptionFlags.None,
        });

_scanResourceView= new ShaderResourceView(Device, _scanTexture);
context.PixelShader.SetShaderResource(0, _scanResourceView);

然后在渲染时填充颜色缓冲区并写入纹理。

protected void Render()
{
    Device.ImmediateContext.ClearRenderTargetView(
        RenderTargetView, new SharpDX.Mathematics.Interop.RawColor4(0.8f,0.8f,0,1));
    Library.GenerateColorBuffer(ref _colorBuffer);
    System.Buffer.BlockCopy(_colorBuffer, 0, depthPixels, 0, depthPixels.Length);

    _parent.DrawBitmap(ref _colorBuffer);

    DataBox databox = context.MapSubresource(_scanTexture, 0, MapMode.WriteDiscard, SharpDX.Direct3D11.MapFlags.None, out DataStream stream);

    if (!databox.IsEmpty)
        stream.Write(_textureStreamBytes, 0, _textureStreamBytes.Length);
    context.UnmapSubresource(_scanTexture, 0);
    context.Draw(4, 0);
}

在上述情况发生之前创建和设置采样器：

var sampler = new SamplerState(_device, new SamplerStateDescription()
        {
            Filter = SharpDX.Direct3D11.Filter.MinMagMipLinear,
            AddressU = TextureAddressMode.Wrap,
            AddressV = TextureAddressMode.Wrap,
            AddressW = TextureAddressMode.Wrap,
            BorderColor = SharpDX.Color.Blue,
            ComparisonFunction = Comparison.Never,
            MaximumAnisotropy = 1,
            MipLodBias = 0,
            MinimumLod = 0,
            MaximumLod = 0,
        });
context = _device.ImmediateContext;
context.InputAssembler.PrimitiveTopology = PrimitiveTopology.TriangleStrip;
context.VertexShader.Set(vertexShader);
context.Rasterizer.SetViewport(new Viewport(0, 0, SurfaceWidth, SurfaceHeight, 0.0f, 1.0f));
context.PixelShader.Set(pixelShader);
context.PixelShader.SetSampler(0, sampler);
context.OutputMerger.SetTargets(depthView, _renderTargetView);

和着色器（使用没有顶点的全屏三角形）：

SamplerState pictureSampler;
Texture2D picture;

struct PS_IN
{
    float4 pos : SV_POSITION;
    float2 tex : TEXCOORD;
};
PS_IN VS(uint vI : SV_VERTEXID)
{
    float2 texcoord = float2(vI & 1,vI >> 1); //you can use these for texture coordinates later
    PS_IN output = (PS_IN)0;
    output.pos = float4((texcoord.x - 0.5f) * 2, -(texcoord.y - 0.5f) * 2, 0, 1);
    output.tex = texcoord;
    return output;
}

float4 PS(PS_IN input) : SV_Target
{
    return picture.Sample(pictureSampler, input.tex);
}

我看到的是：

_colorBuffer长度40000（200宽*200高）

_textureStreamBytes 长度 160000 (200 * 200 * 4bytes)

来自数据框的流长度 = 179200 19200 字节/4800 像素的差异。这转化为 24 行 200 像素宽度。换句话说，纹理比预期宽 24 像素。但是调试显示 width/height 为 200.

Image showing the issue. Left is rendered view, right is bitmap

有谁知道我在这里做错了什么？或者 should/could 以不同方式完成的事情？

谢谢。

P.S。我已经通过使用类似的过程在 OpenGL 中正常工作，但需要让它为 directx 工作：

gl.TexSubImage2D(OpenGL.GL_TEXTURE_2D, 0, 0, 0, (int)width, (int)height, OpenGL.GL_RGBA, OpenGL.GL_UNSIGNED_BYTE, colorBuffer);

Answer 1

根据实验，宽度和高度似乎都需要 32 的倍数。例如 100 * 128，即使 32 的倍数也会导致问题。相反，我正在使用：

var newHeight = (int)(initialHeight / 32) * 32;
var newWidth = (int)(initialWidth / 32) * 32;

我不确定根本问题是我自己的错误还是 sharpDX 问题或 DirectX 问题。我认为解决此问题的另一种方法是向像素阵列添加填充以解决每行末尾的长度差异。

Sharpdx 动态纹理更新不正确

Sharpdx Dynamic Texture Updating Incorrectly

c#

3d

wpf

direct3d

sharpdx