[Bf-committers] OpenGL ES 1.1 or 2.0 for mobile

[Ton Roosendaal]

Hi Alex,

What would be the overhead (or risks) if you'd first do 1.1, and migrate later?
Especially when Android devices all support 1.1 still...

-Ton-

------------------------------------------------------------------------
Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The Netherlands

On 4 Jun, 2012, at 5:11, Alexandr Kuznetsov wrote:

> I'm working on Android port for GSOC.
> 
> For me, this is critical point of choosing between two OpenGL ES as they
> are not compatible. I'm leaning towards ES 2.0 for couple of reasons. Here
> the pros and cons of both:
> 
> OpenGL ES 1.1
> Pros:
> 
>   1. 85% compatible with current code
>   2. ~2 week of work for BGE
> 
> Cons:
> 
>   1. Only fixed limited pipeline without shaders
>   2. Not compatible with ES 2.0 (not easily added)
>   3. Next 10% copy and pasting corrections with ugly #ifdef
> 
> 
> OpenGL ES 2.0
> Pros:
> 
>   1. Shaders
>      1. More flexible
>      2. Faster
>   2. Reuse some existing GLSL
>   3. Possible user shader control/extensions
>   4. Future of mobile
>   5. Future of desktop graphics (GL 3.0+)
>      1. Encapsulation of the drawing code
>      2. Shader oriented code
>      3. Goes nicely with Wilkins's goal
>   6. OpenGL ES 1.1 can be added back easily through a "class"
> 
> Cons:
> 
>   1. 75%  compatible
>   2. ~7 weeks of work (for encapsulation and BGE), (but then it should be
>   fast as we would have shaders manager and setters nicely abstracted.)
> 
> 
> 
> 
> If we would like eventually switch to OpenGL ES 2.0 for mobile, there is no
> better time than now. ES 2.0 implies using only shaders, which is not
> compatible with blender current model. I don't want to fix OpenGL ES
> without abstraction  in order, after a month, to be rewritten by myself and
> Jason. With ES 2.0 I will write a matrices and parameters encapsulations to
> use shaders.
> Want to hear your opinions.
> 
> Thanks,
> Alex.
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