VTests: GL vs D3D9

[paroj]

for the curious: I just ran the VTests on D3D9 and compared the output with GL:
https://ogrecave.github.io/ogre/gl_stat ... s_GL9.html

by the SSIM metric all the tests fail, but this is due to the different pixel center handling and different RNG on Windows vs. Linux. (yeah the tests are cross platform as well) But aside from that most images match.

For GL/ GLES2/ GL3+ comparisons see here:
https://ogrecave.github.io/ogre/

in other news the RTSS now correctly handles point sprites (attenuation is only approximately right).