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These days I am reading nouveau source code,I have found many functions such as mode setting,filling rect and copying area.

However,I cannot find any functions about the window layer. I have searched google,found Linux DRM guide and tried to learn connectors,encoders,CRTCs. But I still can not find any things about window layer hardware acceleration.

Does this acceleration exist? Or it belongs to software? Thank you for your help.

Hi,

windows8 wrote:These days I am reading nouveau source code,I have found many functions such as mode setting,filling rect and copying area.

However,I cannot find any functions about the window layer. I have searched google,found Linux DRM guide and tried to learn connectors,encoders,CRTCs. But I still can not find any things about window layer hardware acceleration.

Does this acceleration exist? Or it belongs to software? Thank you for your help.

I think I need some clarification here...

You found code to do (e.g.) hardware accelerated copying of an area, that would be used by whichever process in user space happens to implement the window layer (e.g. X11); but can't find code to do (e.g.) hardware accelerated copying of an area (that would be used by whichever process in user space happens to implement the window layer)?


Cheers,

Brendan

Brendan wrote:Hi,

I think I need some clarification here...

You found code to do (e.g.) hardware accelerated copying of an area, that would be used by whichever process in user space happens to implement the window layer (e.g. X11); but can't find code to do (e.g.) hardware accelerated copying of an area (that would be used by whichever process in user space happens to implement the window layer)?


Cheers,

Brendan

Oh.... I just want to ask,if the " entirely hardware " window layer acceleration exists...
Maybe the answer is no? Thanks....

Hi,

windows8 wrote:Oh.... I just want to ask,if the " entirely hardware " window layer acceleration exists...
Maybe the answer is no? Thanks....

The answer is "no".

Possibly more importantly, the answer is "No, it doesn't exist and shouldn't exist". As far as hardware is concerned there's lower level things (e.g. textures). Device drivers just provide a "standard for the OS" abstraction that can be used to by other software (e.g. the window manager) to access these lower level things. The window manager provides higher level things (e.g. windows, desktops, etc) and uses the "standard for the OS" abstractions provided many different types of the drivers (video, sound, keyboard, mouse, etc) to do that.


Cheers,

Brendan

Brendan wrote:Hi,

The answer is "no".

Possibly more importantly, the answer is "No, it doesn't exist and shouldn't exist". As far as hardware is concerned there's lower level things (e.g. textures). Device drivers just provide a "standard for the OS" abstraction that can be used to by other software (e.g. the window manager) to access these lower level things. The window manager provides higher level things (e.g. windows, desktops, etc) and uses the "standard for the OS" abstractions provided many different types of the drivers (video, sound, keyboard, mouse, etc) to do that.


Cheers,

Brendan

OK,I see. Thanks a lot!

Brendan wrote:Hi,

windows8 wrote:Oh.... I just want to ask,if the " entirely hardware " window layer acceleration exists...
Maybe the answer is no? Thanks....

The answer is "no".

For a very limited amount of windows (1 or 2), any current hardware will do. "Video overlays" implement exactly those features. There is no generic driver, however.