Linux/PROCESSOR-SDK-TDAX: whether EglSwapBuffers associated with vsync in vision sdk

su diao

Tool/software: Linux

Dears:

The board I used is tda2x , and the sdk is vision sdk.

Whether eglswapbuffers which GPU uses it to draw associated with the display vsync ,whether it waits for the vsync signal arrival and then exchange buffers ?

Tests found that the interface has about 10 milliseconds time-consuming.

So, what is the relationship between the interface and vsync ?

Thanks

over 7 years ago

0 Subhajit Paul over 7 years ago

TI__Expert 7015 points

which version of visin SDK are you using? Which usecase is this? Is this an usecase distributed with vision SDK or is it a custom usecase?

Regards,
Subhajit

0 su diao over 7 years ago in reply to Subhajit Paul

Prodigy 65 points

the vision sdk version is 2.12 ,and the case is a process whicn run in linux .

0 Subhajit Paul over 7 years ago in reply to su diao

TI__Expert 7015 points

Which process is this?

0 su diao over 7 years ago in reply to Subhajit Paul

Prodigy 65 points

The process is which uses openGL, egl ,drm for drawing a view . it runs in the linux , and shows picture on display.

0 Subhajit Paul over 7 years ago in reply to su diao

TI__Expert 7015 points

can you attach the source code for this application. I can try to build it and run on EVM.

0 su diao over 7 years ago in reply to Subhajit Paul

Prodigy 65 points

Sorry ,the application is about our project. I can show some code segment

eglSwapBuffers(disp_kmsc->gl.display, disp_kmsc->gl.surface);
g_next_bo = gbm_surface_lock_front_buffer(disp_kmsc->gbm.surface);
g_fb = drm_fb_get_from_bo(disp_kmsc, g_next_bo);

gbm_surface_release_buffer(disp_kmsc->gbm.surface, prev_bo);
prev_bo = g_next_bo;

0 Subhajit Paul over 7 years ago in reply to su diao

TI__Expert 7015 points

gbm is not tied to VSYNC. The application will be blocked inside eglSwapBuffers() while GPU renders the output surface

0 su diao over 7 years ago in reply to Subhajit Paul

Prodigy 65 points

thank you very much!

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Linux/PROCESSOR-SDK-TDAX: whether EglSwapBuffers associated with vsync in vision sdk