DrawUI | A variety of methods making a drawing canvas UIView | iOS library

There are many ways to tackle this problem depending on what exactly you need. One approach popular in the OO world is the so called Command Pattern (similar approaches exist in other programming paradigms, they just have either different names or are considered so obvious they don't even get a specific name at all).

The basic idea is this: You want to execute some command, but the time you want to execute the command and the time you decide what command to execute are different. So the way to solve this problem is to simply create an object that contains the information you need to execute the command, pass that object to the place that decides when the execution should happen, and then that code can run the command as it pleases.

Here’s a mockup of what that might look like in C++ (note: didn't actually compile this code, might contain minor errors – just meant to convey the idea).

uses the results of any previous drawcall or writes to the same render target

Those are not the same thing. The side-effects of a rendering operation (stuff you modify via image load/store or SSBOs) and stuff written to the framebuffer have very different needs as far as synchronization is concerned.

The fixed function operations that lead to the writing of a value to the framebuffer (scissor test, depth test, blending, etc) are governed by rasterization order: they must happen atomically and in that particular order, within a given primitive and for a particular sample potentially being written to the frame buffer. And the execution of such operations must also respect primitive order: the order of primitives generated by drawing commands, but also the order of primitives within a drawing command.

So as far as rendering is concerned, draw calls will respect the results of previous draw calls, within the same subpass (between subpasses is governed by explicit subpass dependencies). You don't need to do anything special to make blending work. If you have two overlapping triangles, with one happening after the other by primitive order, the second draw's blending will use the results of the first draw. It just works.

Any other writing by your shader requires explicit synchronization.

Seems I was over thinking this and @elgonzo pointed me in the right direction. I now just have the timer display on one line and clear other lines as and when I need them. I have a basic working example that I will expand my main program into. It appears to do exactly what I need (obviously missing validation and functionality) please comment if this can be improved upon:

Newer versions of Android ask the user for permission to access sensitive resources at runtime, not during installation. So you need to prompt the user to give your app permission to write to the file system, before you invoke KetaiCamera::savePhoto().

From the Processing for Android documentation:

This question is a bit dated, but maybe an answer is still helpful: The problem lies in the window objects name:"ChangeTextureFiles_v1.2". Windows etc. are Maya objects and they to not allow spaces or points. You can try it if you simply create a polycube and try to rename it to "polycube_v1.2". For your window you can use the title flag instead:

EDIT:

i took a look and it looks like there is no focus signal that gets emitted. seems like the only way to do it is to make a custom qt window and re-implement the focus functions or to install an event filter which is almost non evasive

to assign the int value to

t of type Target

you need a

getter and setter method

on your t

e.g.