在某些机器上，当线宽为 1.0 时，ID3DXLine 出现奇怪的行为
我现在在几台机器上遇到了这个问题 - 几乎总是笔记本电脑，我认为通常是那些配备英特尔图形芯片组的机器，当使用 ID3DXLine 时。
我有一些代码看起来像这样：
MyLine->SetWidth(MyLineThickness);
MyLine->SetPattern(MyLinePattern);
MyLine->Begin();
{
... Draw some lines with ->MyLine->Draw
}
MyLine->End();
MyLine 是 CComPtr (ID3DXLine)。当 MyLineThickness 为 1.0 时，这些机器会绘制粗线（看起来就像是用毡尖笔绘制的！）。当我将 MyLineThickness 更改为 1.1 或 1.5 时，我会得到漂亮的细线。显然，将其增加到 8.f 左右会再次出现粗线。
因此，当厚度为 1.0 时，这些机器上的 ID3DXLine 似乎会做一些非常奇怪的事情。在< 1.f和> 1.f 它的行为似乎正如您所期望的！
还有其他人在 ID3DXLine 中遇到过任何奇怪的情况吗？顺便说一句，我正在使用 D3D 9.0c 以及 2010 年 2 月的 SDK。
I've had this problem on a couple of machines now - almost always laptops and I think usually those with Intel graphics chipsets, when using ID3DXLine.
I have some code that vaguely looks like this:
MyLine->SetWidth(MyLineThickness);
MyLine->SetPattern(MyLinePattern);
MyLine->Begin();
{
... Draw some lines with ->MyLine->Draw
}
MyLine->End();
With MyLine being a CComPtr (ID3DXLine). When MyLineThickness is 1.0, these machines draw thick lines (looking as if they're drawn with a felt-tip pen!). When I change MyLineThickness to 1.1, or 1.5, I then get nice thin lines. Obviously increasing that to around 8.f will give me thick lines again.
So ID3DXLine on these machines seems to do something really odd when thickness is 1.0. At < 1.f and > 1.f it seems to behave as you would expect!
Has anyone else experienced any strangeness in ID3DXLine? I'm using D3D 9.0c btw, alongside the Feb 2010 SDK.
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根据 DX9 文档，粗细为 1.0f 的线条是使用本机硬件线条绘制支持（如果存在）绘制的。所有其他尺寸都是通过生成一对三角形来绘制的，因此通过顶点着色器进行渲染。尝试检查
D3DCAPS9::LineCaps以获取支持的功能。在玩了一些
ID3DXLine之后，我决定使用DrawPrimitives来绘制线条 - 它可能会慢一点，但至少在任何系统上都能得到相同的结果。According to DX9 documentation lines of thickness 1.0f are drawn using native hardware line drawing support if one exists. All other sizes are drawn by producing a pair of triangles and, hence, rendered via vertex shader. Try checking
D3DCAPS9::LineCapsfor supported capabilities.After some playing with
ID3DXLineI decided to useDrawPrimitivesfor drawing lines - it's probably a bit slower but at least you get same result on any system.