查看“Vivante GCNANO GPU overview”的源代码








==Introduction==

The STMicroelectronics STM32MP1 platform have an '''OpenGLES''' hw IP based on the '''Vivante Gcnano GPU'''.<br>
You can find more information here on the '''Vivante GCNANO web pages''' <ref> http://www.vivantecorp.com/index.php/en/media-article/news/281-20140602-vivante-intros-worlds-first-complete-line-of-gpus-for-wearables-and-iot.html </ref> <ref> http://www.vivantecorp.com/index.php/en/technology/3d.html </ref>

==Features==
===Supported open standards===
The '''Vivante Gcnano GPU''' is compatible with the following '''Khronos's open standards 3D graphics''' <ref> http://www.khronos.org/ </ref>:
* OpenGLES 2.0
* OpenGLES 1.1
* OpenVG 1.1
* EGL 1.4

===Vivante Gcnano GPU configuration===

* '''Core Clock''' 264MHz
* '''Shader Clock''' 264MHz
* '''Pixel Rate''' 264 MPixel/sec
* '''Triangle Rate''' 26.4 M tri/sec
* '''Vertex rate''' 66 M vtx/sec
* '''1 shader core (Vec 4)'''
* '''2.112 GFLOPS shader'''

==GPU softwares==

[[File:GPU_software_structure.png|center|800px|link=]]

===Vivante Gcnano GPU userland libraries===
 excepted if customers signed a NDA with Vivante (please contact Vivante if you need these library source codes). The Gcnano libraries (userland) are:

* OpenGLES 1.1 library
* OpenGLES 2.0 library
* EGL 1.4 library
* gbm library
* GAL library
* GLSLC and VSC libraries
* VDK library

===Vivante Gcnano kernel driver===
'''{{Green|Source code is available for all customers}}''' in all OpenSTLinux baselines. <br>
<br>
To access source code:
 devtool modify gcnano-driver-stm32mp

Source code is then downloaded here:
*'''<your_view>/build*/workspace/sources/gcnano-driver-stm32mp'''
<br>
Refer to [[OpenEmbedded - devtool]] to know more about devtool.

===Additional information===
* STMicroelectronics provides '''debug Vivante Gcnano libraries''' according to any baseline version, '''allowing customers to debug/analyze their applications''' with the '''Vivante Tool Kit (VTK)'''. Please have a look to the article [[How to debug the Gcnano GPU with VTK]] for more details.

==Useful links==
{{ReviewsComments|PCO (W803) : This link is not at all useful : ( I think we can remove this chapter}}
* Vivante website: http://www.vivantecorp.com/

==EGL==
===Supported EGL backend===
From VIVANTE_GAL3D_Unified_Src_drv_6.1.x, Vivante delivery, Vivante Gcnano libraries support both '''DRM/GBM''' and '''Wayland''' backends.<br>
Refer to [[EGL backends]] article for details.

===EGL texture 0-copy===
Gcnano supports the EGL texture 0-copy extension.

EGL texture 0-copy extension allows an EGL application to share a texture buffer with the GPU by avoiding to copy the texture from application to the GPU.

Refer to [[EGL texture 0-copy]] article for more details.

==Graphic Benchmarks==
Please refer to the [[How to test and benchmark OpenGLES]] article.

==Debugging==
Please have a look to following articles:
* [[How to activate the Gcnano GPU debug mode]]
* [[How to debug the Gcnano GPU with VTK]]

==References==
<references />

<noinclude>
[[Category:GPU]]
</noinclude>