[Public WebGL] y-orientation for texImage2D from HTML elements

Florian Bösch [email protected]
Fri Dec 7 00:20:11 PST 2012


The viewport rendered to an FBO's attached texture starts at 0,0
bottom/left. OpenGL *does* specify things as bottom up.


On Fri, Dec 7, 2012 at 4:09 AM, Mark Callow <[email protected]>wrote:

>  On 2012/12/07 11:49, Jeff Gilbert wrote:
>
> A form of UNPACK_FLIP_Y_WEBGL that only affected HTML element uploads is needed to provide a level of (texImage) consistency for 0,0=bottom-left apps that 0,0=top-left apps already enjoy.
>
>  You can't classify apps as bottom-left or top-left. (Correct) apps will
> use whatever texture-coordinates and transforms are appropriate for each
> texture. There is a high possibility of multiple orientations being used.
>
> Regards
>
>     -Mark
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