Re: [Stellarium-pubdevel] ***SPAM(-1.4)*** RE: ***SPAM(-1.4)*** RE: ***SPAM(-1.4)*** RE:Shader fortone conversion

[Fabien C. <fab...@go...>]

Hi thanks!
Could try to put back the code instruction by instruction and look
where it fails?
Fabien

On Mon, Jun 22, 2009 at 16:14, Steve Ingamells<ste...@te...> wrote:
> Hi Mike, Fabien,
>
> Further to this, I tried replacing the shader file with a basic one with
> just the lines:
>
> void main()
> {
>  gl_Position = ftransform();
> }
> which I understand to be about the minimum that it can be.
>
> On the one hand, Stellarium does not crash when it starts and it appears to
> compile and link the shader.
>
> On the other, when Stellarium starts, the atmosphere view seems to be all or
> nothing - it seems to depend on where on the screen the horizon is (I am
> using perspective view) and is either all white or black with no stars
> visible, and an occasional white bar along the top right of the screen
>
> The fps now seems to be about what I normally get - 15-20
>
> If I make the shader file anything less than that above the system loads but
> is very slow - 2-3 fps...
>
> Hope this helps!
>
> Steve
>
> ________________________________
> From: Steve Ingamells [mailto:ste...@te...]
> Sent: Sunday, June 21, 2009 7:32 PM
> To: 'Stellarium developers public mailing list'
> Subject: [Stellarium-pubdevel] ***SPAM(-1.4)*** RE: ***SPAM(-1.4)***
> RE:Shader fortone conversion
>
> Hi Mike,
>
> I edited the Atmosphere constructor in stellarium\src\modules\Atmosphere.cpp
> as follows:
>
> Atmosphere::Atmosphere(void) :viewport(0,0,0,0),skyResolutionY(44),
> posGrid(NULL), colorGrid(NULL), indices(NULL),
>         averageLuminance(0.f), eclipseFactor(1.),
> lightPollutionLuminance(0), useShader(false)
> {
>  setFadeDuration(3.f);
>  if (GLEE_VERSION_2_0)
>  {
>   useShader=true;
>  }
>  // turn off shaders completely
>  useShader=false;
>
>  if (useShader)
>  {
>   qDebug() << "Use vertex shader for atmosphere rendering.";
>   QString filePath;
> ....
>
> which ensures that it will disable shaders even if the OpenGL version is 2.
>
> I suppose there may be a way to disable OpenGL 2 support in the graphics
> drivers but I don't know of one. Or it may be possible to create a shader
> file that does absolutely nothing (about which I have absolutely no idea),
> which would at least mean no messing about with the innards of Stellarium!
>
> Hope this helps.
>
> Best,
> Steve
>
>
> ________________________________
> From: Lone Hiker [mailto:lon...@ho...]
> Sent: Sunday, June 21, 2009 2:57 AM
> To: ste...@li...
> Subject: Re: [Stellarium-pubdevel] ***SPAM(-1.4)*** RE: Shader fortone
> conversion
>
> Hi Steve,
>
> Exactly how do you disable shaders when compiling? Where does the
> 'useShader=false' flag go?
>
> I'm having a different issue with the shader when trying to change the night
> sky color and I'd like to disable it until Fabien or someone else can
> address my post.
>
> Mike
>
>
>> From: ste...@te...
>> To: ste...@li...
>> Date: Tue, 16 Jun 2009 18:59:18 +0100
>> Subject: [Stellarium-pubdevel] ***SPAM(-1.4)*** RE: Shader for tone
>> conversion
>>
>> Hi Fabien,
>>
>> I have just got back into Stellarium stuff and built revision 4705 for
>> Windows (XP Pro SP3) and although my laptop's graphics card claims to be
>> OpenGL 2.0 compliant, it crashes on startup just after logging that it
>> will
>> use shaders. Recompiling with useShader=false makes it work fine.
>>
>> Hardware is a Dell latitude D810 with ATI Radeon 300X (64MB). I have the
>> latest drivers from Dell. I don't have any other supposedly OpenGL-2.0
>> hardware with which to test, unfortunately.
>>
>> If there's any further info that would help, please let me know.
>>
>> Best regards,
>> Steve Ingamells
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