Hi;
On 5/31/21 12:33 PM, Zong, Wei wrote:
Hello,
I'm using GLES shader to run algorithms on image frames, I got very bad
performance issue in GPU & CPU data sharing, especially retrieve data
from GPU to CPU.
Basically, I use
*/glGenBuffers/*/*/glBindBuffer/*/*/glBufferData(target, size, data,
usage) /*to create GPU buffer object and initialize GPU data store with
CPU data pointer. After GLES shader finished the processing, I use
/*glMapBufferRange*///to retrieve processed image data back to CPU, and
for some reason I have to do an extra data copy from the gl map pointer
to another CPU buffer, this is super slow.
Here’s the code snippet
https://github.com/intel/libxcam/blob/master/modules/gles/gl_buffer.cpp#L94
<https://github.com/intel/libxcam/blob/master/modules/gles/gl_buffer.cpp#L94>
https://github.com/intel/libxcam/blob/master/modules/gles/gl_buffer.cpp#L127
<https://github.com/intel/libxcam/blob/master/modules/gles/gl_buffer.cpp#L127>
I wonder If there has other efficient way to sharing data between CPU &
GPU GLES shader?
Thanks,
Zong Wei
Could you break down the use-case here a bit, why do you need CPU access
to the image? If I understand correctly, is it so that camera pipeline
renders to a dmabuf and then this is imported to GLES for processing and
then you map it to CPU for ... something?
Thanks;
// Tapani
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