This gets rid of GL state changes for questionable gain. It also fixes drawing
of fade sky backgrounds in global viewports (where, for some reason, the shade
model was set to GL_FLAT instead of GL_SMOOTH).
This allows to see the whole landscape without any areas covered by FoW
in the global viewport. Basically the ambient lighting is set to 1.0
independent of the ambient light map. In the course of this, a second
shader for the landscape has been introduced.
There were two problems with the previous transforms:
1) For inverting the Y axis for the ambient map, the total height of the
output window is needed, not only the viewport region.
2) The Y offset to only use the part of the light texture that is being
rendered to was not applied.
In order to keep the transformations more readable, a new lightweight class
C4FragTransform has been introduced which can only handle translations
and scales in x and y.
This allows to ignore slice declarations using `#define slice(x)`, which
mill be useful for custom mesh material shaders, allowing to write them
such that they can be used standalone in a mesh viewer but also as slices
for OpenClonk, in which case lighting and color modulation will be applied
automatically.
The load function now calls several functions for loading specific files, even if these functions may be very short. The behaviour changed slightly: Sounds are now always loaded before the graphics. Enables loading sounds even if the graphics are invalid.
Conflicts:
src/object/C4Def.cpp
Since we're no longer using DirectX, nVidia's automatic detection no longer works classifies OpenClonk as a game to use the high performance GPU. Note that this flag does not work on some old drivers (version<302 according to specs). To support these old drivers, we would have to link against DirectX despite not using it.
This doesn't fix material preview in editor mode yet but at least there's no more assertion. We should probably create a proper render target surface for that.
The engine (extra)warns whenever you use Par() or ... inside of a
function that is not declared as taking a variable number of arguments.
Change the declaration of all System.ocg varargs functions so it is
immediately obvious.
Tobias Zwick