Z-writing wrongly enabled for transparent shader materials

[Nadro]

Ad1. Maybe instead of "force blending" mechanism we should add new EBO value like EBO_AUTOMATIC (it will be default instead of EBO_NONE). This value will inform that engine shouldn't change EBO per SMaterial, but it should use blending values stored in material renderer.

Ad2. I'll check it again tomorrow.

BTW. To fix isTransparent method we have to check blending operation + blending function values, however i'm not sure if we shouldn't add field (with default value set to AUTO) to SMaterial to give the user control to force reqister for solid or transparent pass process. Automatic mechanism will be not working properly in each situation.

[CuteAlien]

Uff, I really should spend more time on figuring this out, but I'm in deep-panic-mode already in my current project, so I can't...
Just try to get away with minimal changes you need for the fix and don't try fixing 2 problems at the same time. EBO_AUTOMATIC might be a good idea - I can't tell without getting deeper into this. Be careful not to change the value of the existing enums - you can only add new enums with new values or you break any kind of serialization anyone used on materials (some people have big material-databases and it would be nice not to break those).

[Nadro]

Thanks for the hint about enums + serialization, I forgot about it (probably, because i never use Irrlicht serialization).

Today I'll try to push commit related to something like an EBO_AUTOMATIC.

[Nadro]

I sent commit with changes to trunk.
- Force blending mechanism was removed.
- I didn't add EBO_AUTOMATIC, just improved comment for E_BLEND_OPERATION, because original was wrong.

First implementation with EBO_NONE was properly. Bug existed in other place - wrong base material handling by material renderer (calls order). It's already fixed. Tomorrow I'll add commit related to blend function call per SMaterial.

[Nadro]

Separate blending support is available in trunk. In last commit I added BlendFactor to SMaterial too. At now EMT_ONETEXTURE_BLEND should be signed as deprecated for all shader based materials. All tasks related to this discussion are finished.