Several rendering changes have resulted in a non-rendering build that
failed to build from source. Dummy out all of these functions to make it
work again.
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.
Now we use the shader to do a proper blend - this avoids some artefacts
that were visible before. Also after some hair-pulling the coordinate
transformation now seems to be more correct than before. Maybe even
with zoom. We'll see.
This introduces a new texture, an ambient light map, that is generated
automatically at the beginning of the round by the sky portion of the
landscape. This basically makes everything that is close to sky visible
by default.
The shaders have been adapted so that they deploy direction-independent
lighting for the ambient component, and the current (diffuse) behaviour
for the diffuse component. This makes the shaders use an additional
texture unit that represents the ambient light. We can think about merging
this information into the light texture, but the coordinate systems are
different at the moment, so this could be performed at the stage of light
texture generation.
For meshes, the ambient material is not actually used, but instead a
diffuse light from the front is used. This makes many meshes look more
interesting, maybe also because the ambient material setting of most
meshes are not set correctly at the moment.
* added some class and method documentation, removed some superfluous comments like
void C4FoW::Update(C4Rect r)
{
// Update all lights
...
* added ASK comments that need clarification before proper documentation
Julius Michaelis