[meta-freescale] SABRE Lite, OpenGL ES 2.0, FBO, low performance

[Prabhu S]

Please post graphics performance related questions in
community.freescale.com


On Mon, Jun 16, 2014 at 6:44 AM, Osobniak Oskar <oskar.osobniak at brightone.pl
> wrote:

>  Hi
>
>
>
> I added FBO support but looks like the performance is much lower than I
> expected. I'm using two screens (scene rendered for two cameras). Without
> FBO I have 55 fps. After adding it (texture 1024x768) - it's only 26 fps.
>
> I also checked different configurations:
>
> 1. "Slower" - scene rendered 4 times + 2 quads with texture:
>
> Camera1 to FBO1
>
> Camera2 to FBO2
>
> Screen1: Camera1 - fullscreen, Camera2 - FBO2, shown on small quad
>
> Screen2: Camera2 - fullscreen, Camera1 - FBO1, shown on small quad
>
> Results (for different texture size):
>
> 256x256 - 50 fps
>
> 1024x768 - 30 fps
>
> 2048x2048 - 9 fps
>
>  2. "Faster" - scene rendered 2 times + 4 quads with texture:
>
> Camera1 to FBO1
>
> Camera2 to FBO2
>
> Screen1: Camera1 - FBO1, fullscreen, Camera2 - FBO2, shown on small quad
>
> Screen2: Camera2 - FBO2, fullscreen, Camera1 - FBO1, shown on small quad
>
> 256x256 - 43 fps
>
> 1024x768 - 23 fps
>
> 2048x2048 - 8 fps
>
>
>
> Part of the code:
>
>
>
> // ## rendering to texture1 ##:
>
>
>
> glViewport(0, 0, 1024, 768);
>
> glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
>
> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>
>
> // drawing scene
>
>
>
> glBindFramebuffer(GL_FRAMEBUFFER, 0);
>
> glViewport(0, 0, 1024, 768);
>
>
>
> // ## rendering to texture2 ##:
>
> // (performed for 2nd FBO)
>
>
>
>
>
> eglMakeCurrent(...);// setting screen1
>
> // drawing fullscreen quad with FBO1
>
> // drawing small quad with FBO2
>
> eglSwapBuffers(...);// for screen1
>
>
>
> eglMakeCurrent(...);// setting screen2
>
> // drawing fullscreen quad with FBO2
>
> // drawing small quad with FBO1
>
> eglSwapBuffers(...);// for screen2
>
>
>
>
>
> Do I need to change/add something or the device is not enough fast for
> using FBO?
>
>
>
>
>
> Pozdrawiam / Best regards,
>
>
>
> *Oskar Osobniak*, Software Engineer
>
>
>
> *brightONE Sp. z o.o.*
>
> Product Engineering Services
>
> e-mail oskar.osobniak at brightone.pl, direct +48918316358
>
> Malczewskiego 26, 71-612 Szczecin, POLAND, www.brightone.pl
>
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