Re: [Mesa3d-dev] ctx->Driver.ResizeBuffers

[tomas c. <to...@db...>]

Matt Sealey wrote:

>>>If they are different, it inserts the new values into ctx->DrawBuffer, and
>>>calls ctx->Driver.ResizeBuffers() - that way all the buffers suddenly become
>>>the way Mesa expects (it asks the driver, makes sure it stores the correct
>>>values, and then asks the driver to size appropriately).
>>
>>So if glViewport(0, 0, 1280, 1024) is called on a window which is only 
>>800 * 600 pixels, the window gets automatically resized?
>>I don't think glViewport() should be able to resize the window.
> 
> No.

Well... if you say so

> 
> If you call glViewport(0,0,1280,1024) then Mesa will clip to that and the
> driver will be told to allocate a buffer of that size. The window will
> stay the same, only the BUFFERS will change (imagine a window that
> scrolls on the inside.. but with no scrollbars :)

No matter how big the window is, the buffers are always allocated using 
the width/height provided by glViewport().

> 
> The times when you call glViewport() are.. when your window is resized
> (for instance, glut Reshape callback).

Usually, one sets glViewport() to the window size, not more or less.


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wereHamster a.k.a. Tom Carnecky   Emmen, Switzerland

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