Re: [AD] 5.1?

[Pavel Sountsov <slabode@xxxxxxxxxx>]

Trent Gamblin wrote:
> On Mon, April 26, 2010 5:37 pm, Pavel Sountsov said:
> > glOrtho just happens to be one 3D transformation that plays nicely with
> > 2D transformations (it has many zeroes in it). Regardless of that,
> > sticking strictly with 2D functions gives me identical results for both
> > OGL and the 2D transformations. See the attached code for an example.
>
> Strange. Here is the output I get from that program:
>
> OpenGL:
>
> -0.031058 0.193185 0.000000 0.000000
> 0.061006 0.027244 -0.000000 -0.000000
> 0.000000 0.000000 0.022222 0.000000
> -491.855225 579.183411 -1.222222 1.000000
>
> A5:
>
> -0.031058 0.061006 0.000000 0.000000
> 0.193185 0.027244 0.000000 0.000000
> 0.000000 0.000000 0.022222 0.000000
> 6.172939 -2.702831 -1.222222 1.000000
>
> Max Deviation: 581.886230

Hmm... it seems you have an older version of the 2D transformations. 
They were broken for a good while (up until they were inserted into the 
allegro core).

-SiegeLord

> Trent :{)>
>
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