是否可以将OpenCV GpuMat绑定为OpenGL纹理？ [英] Is it possible to bind a OpenCV GpuMat as an OpenGL texture?

问题描述

我找不到任何参考资料，除了：

I haven't been able to find any reference except for:

http://answers.opencv.org/question/9512/how-to-bind-gpumat-to-texture/

它讨论了CUDA方法。

which discusses a CUDA approach.

理想情况下，我想更新一个OpenGL纹理， cv :: gpu :: GpuMat 没有复制回CPU，并且没有直接使用CUDA（虽然我认为这可能是必要的，直到添加此功能）。

Ideally I'd like to update an OpenGL texture with the contents of a cv::gpu::GpuMat without copying back to CPU, and without directly using CUDA (although i presume this may be necessary until this feature is added).

推荐答案

OpenCV支持OpenGL。请参见 opencv2 / core / opengl_interop.hpp 头文件。您可以将GpuMat的内容复制到纹理：

OpenCV has OpenGL support. See opencv2/core/opengl_interop.hpp header file. You can copy the content of GpuMat to Texture:

cv::gpu::GpuMat d_mat(768, 1024, CV_8UC3);
cv::ogl::Texture2D tex;
tex.copyFrom(d_mat);
tex.bind();
// draw something

您也可以使用 cv :: ogl :: Buffer 类。它是OpenGL缓冲存储器的包装器。这个内存可以映射到没有内存复制的CUDA内存：

You can also use cv::ogl::Buffer class. It is a wrapper for OpenGL buffer memory. This memory can be mapped to CUDA memory without memory copy:

cv::ogl::Buffer ogl_buf(1, 1000, CV_32FC3);
cv::gpu::GpuMat d_mat = ogl_buf.mapDevice();
// fill d_mat with CUDA
ogl_buf.unmapDevice();
// use ogl_buf in OpenGL
ogl_buf.bind(cv::ogl::Buffer::ARRAY_BUFFER);
glDrawArray(...);

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