像&QUOT的函数glReadPixels"在DirectX / SharpDX [英] A function like "glReadPixels" in DirectX / SharpDX

问题描述

我在寻找一种方式来阅读在一个mousepoint像素的颜色。在OpenGL它被调用绘制场景后函数glReadPixels（或它的一部分）来完成。我想作一个简单的颜色选择常规的背景下，为identifing一个形状/在三维空间线条。

I'm searching for a way to read a pixels color at the mousepoint. In OpenGL it was done by calling the function "glReadPixels" after drawing the scene (or parts of it). I want to make a simple color picking routine in the background, for identifing a shapes / lines in 3D Space.

那么，有没有其他等效方法/功能/建议的？做同样的SharpDX（的DirectX10 / DirectX11的）

So, is there any equivalent method/function/suggestion for doing the same in SharpDX (DirectX10 / DirectX11) ?

推荐答案

这是完全可能的Direct3D11：只需按以下步骤操作：

This is perfectly possible with Direct3D11: simply follow these steps:

• 使用的 DeviceContext.CopySubResourceRegion 从源纹理复制一部分暂存纹理（要回读像素面积，相同格式的大小，但ResourceUsage.Staging）


• 从使用device.map的/ UNMAP该分段的纹理像素。

• Use DeviceContext.CopySubResourceRegion to copy part from the source texture to a staging texture (size of the pixel area you want to readback, same format, but with ResourceUsage.Staging)
• Retrieve the pixel from this staging texture using Device.Map/UnMap.

有足够的讨论关于围绕净这个话题（例如：阅读从质地一个像素CPU中的DX11 ）

There is plenty of discussion about this topic around the net (for example: "Reading one pixel from texture to CPU in DX11")

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