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Re: [Mingw-cross-env-list] Qt / Angle / OpenGL

From: SEAiq
Subject: Re: [Mingw-cross-env-list] Qt / Angle / OpenGL
Date: Fri, 23 Jan 2015 01:39:50 -0600

Hi Mark,

Thanks for the explanation of the status of ANGLE with MXE.

best, Mark

> On Jan 22, 2015, at 3:42 AM, Mark Brand <address@hidden> wrote:
> On 01/22/2015 04:05 AM, SEAiq wrote:
>> We do use the normal OpenGL interface and when it works it works great.  
>> However, our app (a marine navigation app used by pilots to navigate large 
>> seagoing vessels) makes use of OpenGL shaders so it will not work with the 
>> Microsoft OpenGL 1.1 fall-back library.  Expecting users to have up to date 
>> OpenGL libraries is (very) problematic.
>> I believe it is exactly for this reason that Google and Firefox invested the 
>> effort in developing ANGLE… its avoids the hassles with OpenGL libraries not 
>> working or being out of date.  I believe it is also for this reason that QT 
>> has embedded ANGLE in their distribution.
>> Does anyone have any experience with using ANGLE as part of or in 
>> conjunction with MXE?
>> best, Mark
> I have not tried it yet but it would be nice to get angle support building 
> successfully with MXE. You mentioned that you started out by running qmake in 
> the src/angle directory, but I suggest the following approach:
> Start by changing qtbase.mk so that the angle option instead of —opengl 
> desktop is passed to the configure script. If this doesn't work, I would 
> start by suspecting that qtbase's configure script doesn't handle this 
> properly for cross-compiling for MXE. Keep in mind that the use of the 
> configure script for cross-compiling for mingw is not officially supported by 
> the Qt project. The fact that it works as well as it does is due to patches 
> from us, the MXE project. Qt officially uses configure.exe both for msvc and 
> mingw. You could examine configure.exe's source code (in the qtbase tree) to 
> see what it does for angle, and try to fix the configure script so it does 
> the same.
> Mark

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