如何在另一种颜色的顶点缓冲区中绘制顶点 [英] How to draw vertices in a vertex buffer in another color

问题描述

我使用Direct3D 9画线。

I'm using Direct3D 9 to draw lines.

现在使用的顶点格式为 D3DFVF_XYZ | D3DFVF_DIFFUSE 并存储在顶点缓冲区中。它们以 DrawPrimitive 作为 D3DPT_LINELIST 绘制。

The vertices I am using now have the format D3DFVF_XYZ|D3DFVF_DIFFUSE and are stored in a vertex buffer. They are drawn with DrawPrimitive as D3DPT_LINELIST.

我改变整个绘制的顶点缓冲区的绘制颜色，甚至一个特定的顶点，而不锁定顶点缓冲区来修改它的内容？这必须在每一帧。

How do I change the drawn color of a the whole drawn vertex buffer or even a specific vertex without locking the vertex buffer to modify it's content? This has to be done every frame.

这是否可能与顶点缓冲区？我更喜欢没有自定义着色器的解决方案（使用默认的direct3d 9流水线）。

Is this possible with a vertex buffer? I would prefer a solution without a custom shader (using the default direct3d 9 pipeline).

如果这是不可能的， ？我只能想到锁定顶点缓冲区或使用 DrawPrimitiveUP 。

If this is not possible, what would be the next best thing to do performance wise? I can only think of locking the vertex buffer or using DrawPrimitiveUP. Both are pretty terrible performance wise.

更新为解决方案代码：

m_pDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
m_pDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_SELECTARG1);
m_pDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_CONSTANT);
m_pDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_CONSTANT);
m_pDevice->SetTextureStageState(0, D3DTSS_CONSTANT, D3DCOLOR_ARGB(120,0,255,0));

顶点不需要 FVF_DIFFUSE 。

推荐答案

使用固定函数管道你可以使用 SetTextureStageState a href =http://msdn.microsoft.com/en-us/library/windows/desktop/bb174462%28v=vs.85%29.aspx =nofollow> doc ）指定一个常量颜色，应与 D3DTSS_CONSTANT （ doc ）。使用此选项，您可以为整个drawcall设置颜色。

With the fixed function pipeline you could use SetTextureStageState (doc) to specify a constant color, which should be used with D3DTSS_CONSTANT (doc). With this option you could set a color for the whole drawcall.

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