AM57xx OpenGL ES 2.0 bc-cat Texture Streaming Extension

phil class

Other Parts Discussed in Thread: DM3730

On the DM3730, we successfully used the bc-cat kernel module to perform efficient pixel reads from the GPU rendering with the SGX 530. We used these instructions to get that to work:

http://processors.wiki.ti.com/index.php/OpenGLES_Texture_Streaming_-_bc-cat_User_Guide
http://software-dl.ti.com/dsps/dsps_public_sw/apps_processors/OMAP35x_AM35x_Video_Texture_Streaming/1_0/index_FDS.html

It seems that the AM57xx does not support PIXMAP EGL Surfaces or the streaming texture extensions using bc-cat.

Is this true? If so, what is the alternative for fast alternatives to glReadPixels()?

Thank you.

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

I will ask the video experts to comment.

0 Anand Balagopalakrishnan over 9 years ago in reply to Biser Gatchev-XID

TI__Expert 5130 points

Hello,

Can you let us know your main requirement? To pass YUV frames as streaming textures for rendering? Or read the rendered frames in CPU?

These are two different use cases - first involves a GPU read while the second involves CPU read.

Regards,

Anand

0 phillip class over 9 years ago in reply to Anand Balagopalakrishnan

Intellectual 635 points

Hi Anand,

The main requirement is to read the rendered frames from the GPU.

Thank you,

Phil

0 Anand Balagopalakrishnan over 9 years ago in reply to phillip class

TI__Expert 5130 points

Hi Phil,

The GBM EGL provides an API - gbm_bo_get_fd(). This FD corresponds to the underlying DRM dumb buffer.

Given the FD, you should be able to use map the dumb buffer to user space.

Regards,
Anand

0 phillip class over 9 years ago in reply to Anand Balagopalakrishnan

Intellectual 635 points

Thank you this worked. Does the SGX have a YUV Extension for OpenGL to provide it Textures in YUV format rather than RGBA format? Thanks.

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AM57xx OpenGL ES 2.0 bc-cat Texture Streaming Extension