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Re: [Public WebGL] WebGL back buffer contents



On Jan 26, 2010, at 3:28 PM, Chris Marrin wrote:

> 
> On Jan 26, 2010, at 10:00 AM, Vangelis Kokkevis wrote:
> 
>> 
>> 
>> ...
>> I think we should settle on having the contents of the WebGL drawing
>> buffer be persistent, like the 2D context. Having a completely new
>> back buffer potentially swapped in unexpectedly will be too surprising
>> to the programmer.
>> 
>> -Ken
>> 
>> I like that idea although I'm not sure how we would handle resizing of drawing surface.  What's the expectation then? 
> 
> Here is what the Canvas element says:
> 
> 	When the canvas element is created, and subsequently whenever the width and height attributes are 
> 	set (whether to a new value or to the previous value), the bitmap and any associated contexts must 
> 	be cleared back to their initial state and reinitialized with the newly specified coordinate space 
> 	dimensions.
> 
> 	When the canvas is initialized, its bitmap must be cleared to transparent black.
> 
> That seems like an appropriate definition for us.

My only concern with this exact definition is that the 2d canvas is completely reset - all state is clobbered, applying the same logic to webgl would imply that all shaders, etc would be unloaded as well, which seems a little extreme.

--Oliver

> 
> -----
> ~Chris
> cmarrin@apple.com
> 
> 
> 
> 
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