New pcsx2 revision 5860 - Printable Version

Code:
gsdx ogl: correct most of Z-depth issue



Best setting if you driver support GL_NV_depth_buffer_float =&gt; GL_NV_Depth = 1 &amp; logz = 0

Otherwise =&gt; GL_NV_Depth = 0 &amp; logz = 1



Explanation of the bug:

Dx z position ranges from 0.0f to 1.0f (FS ranges 0.0f to 1.0f)

GL z Position ranges from -1.0f to 1.0f (FS ranges 0.0f to 1.0f)



Why it sucks:

GS small depth value will be "mapped" to -1.0f. In others all small values will be 1.0f! Terrible lost

of accuraccy.



The GL_NV_depth_buffer_float extension allow to set the near plane as -1.0f.

So

"GL z Position ranges from -1.0f to 1.0f (FS ranges 0.0f to 1.0f)"

will become

"GL z Position ranges from -1.0f to 1.0f (FS ranges -1.0f to 1.0f)"

and therefore

"z posision [0.0f;1.0f] will map to FS [0.0f;1.0f]" as DX



Yes we just get back all precision lost previously :)

However you need hardware (intel?) and driver support (free driver?/gles?) :(