[Interest] Qt and OpenCL crash course

[Jason H]

Thanks everyone. 

Sean, can you elaborate on "Qt has good support for OpenGL so using this approach should be pretty simple for you." 
Is this just referring to GL Widgets?

Thanks again.


________________________________
From: Sean Harmer <sean.harmer at kdab.com>
To: interest at qt-project.org; Jason H <scorp1us at yahoo.com> 
Sent: Thursday, March 13, 2014 5:40 AM
Subject: Re: [Interest] Qt and OpenCL crash course


On Wednesday 12 March 2014 12:08:53 Jason H wrote:

> I need to do some elementary graphics operations on QPixmap or QImage. I can
> do these in Qt to some extent already. But for this latest project I will
> be processing 4k resolution images. My operations are:
> Translate off origin
> Rotate by an acute angle (around a point sometimes not in the image) 
> Pixel value normailzation
> 
> To what extent does Qt support these operations in a hardware accelerated
> manner? Or how hard is it for me to use the hardware to produce those
> functions to inter-operate with Qt?
> 
> Many thanks!

Have you considered using OpenGL? Two options:

1) If you have OpenGL 4.3 capable hw use a compute shader plus a texture or 
shader storage buffer

2) If you don't have OpenGL 4.3 capable hw use a framebuffer object and a 
texture.

Qt has good support for OpenGL so using this approach should be pretty simple 
for you.

Cheers,

Sean
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