[GEM-dev] 2textures + gemframebuffer

[cyrille henry]

marius schebella a écrit :
> hey cyrille,
> thanks a lot! everything is working now!
cool
> I also think it is strange that you have to render the last texture (23) 
> before the shader (13).
23 is rendered after 13.
what i think is strange is that the last framebuffer can not be computed after rendering to texunit 1 and 2 (gemhead 21 and 22)

> is there any possibility to influence the pix size other than loading 
> images that have the same dimen as the gemframebuffer?
yes, you can.
in your shader, just use texcoord0 * size_frambuffer.xy / size_dummy_image.xy

cyrille

> marius.
> 
> cyrille henry wrote:
>>
>>
>> marius schebella a écrit :
>>> actually, the 06. patch might be more complex, but it is not doing 
>>> what I need. I really need two textures, both coming from other 
>>> framebuffers. 
>> that's what i send you in my last mail.
>>
>>> and all my attempts with dummy images failed.
>>> can you have a look at my patch? I hope the zip does not get caught 
>>> in the spam.
>> ok
>> you should not send texunit to the texture you're using to texture in 
>> a square : the 1st texture (texunit 0) is used for the texturing, so 
>> sending texunit 1 will result in corrupted  data in texunit 0.
>> so, you have to get the texture Id out of the framebuffer, and send it 
>> to an other pix_texture. this 2nd pix_texture can then be used as 
>> texunit 1...
>>
>>
>> rendering order is very important. i don't understand why frambuffer 
>> should be render before anything else. this is certainly a small bug.
>>
>> so, this patch work with image. with video, you'll may have 1 frame 
>> delay.
>>
>> in fact, you're right, it's not trivial, i'll may have to clean this 
>> patch and commit it to cvs.
>>
>> cyrille
>>
>>
>>> thank you!
>>> marius.
>>>
>>>
>>> cyrille henry wrote:
>>>>
>>>>
>>>> marius schebella a écrit :
>>>>> cyrille henry wrote:
>>>>>
>>>>>> look at example 06 in 10.glsl gem example folder.
>>>>>>
>>>>>> (a patch is better than any explanation...)
>>>>>
>>>>> this patch still uses one texture that comes directly from an image 
>>>>> (gemhead 17...). In my case I wanted to use both inputs from a 
>>>>> gemframebuffer.
>>>> that's not a problem.
>>>> just remove the part that load texture 2, and replace it by a copy 
>>>> of the part that use a glsl / framebuffer (changing texunit 3 to 
>>>> texunit 2).
>>>>
>>>> here is the result.
>>>> (shader are not relevant, but it work here)
>>>> moreover, this patch is more complex than what you need, as shader 
>>>> output is used for next frame as shader input to create a feedback 
>>>> loop, but it's easy to remove this.
>>>>
>>>> if you still have problem, i certainly have to create a 07 example...
>>>>
>>>> cyrille
>>>>
>>>>
>>>>> marius.
>>>>>
>>>>>
>>>
>>>
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> 
> 
>