This is mostly the same approach as in GL1. I'm not quite sure if the
software rasterizer can work with all aspects and the like but I wasn't
able to crash it by trying several random resultions.
For some fucking reason, if you set an unsupported
SDL_GL_MULTISAMPLESAMPLES value on Windows (at least Win10 with Intel GPU
drivers, there 16 is unsupported), creating the Window and OpenGL context
will succeed, but you'll get Microsofts stupid GDI OpenGL software
implementation that only supports OpenGL 1.1.
Before these fixes, the GL3 renderer would just crash and the GL1 renderer
would fail to load, which caused the game to run in the background:
No Window, no Input, but sound was playing..
Now this problem should be handled properly and if initialization fails,
the rendering backend will be considered not working, and it will
try the gl1 backend next, and if that also fails it'll give up and exit
the game.
SDL_WINDOW_FULLSCREEN changes the display resolution if the requested
resolution is different to the actual resultion. SDL_WINDOW_FULLSCREEN_
DESKTOP doesn't do that, it places a smaller or bigger render area
somewhere inside the fullscreen area. This is somewhat nicer with modern
high resolution flatscreens.
This commit changes vid_fullscreen 1 from SDL_WINDOW_FULLSCREEN to
SDL_WINDOW_FULLSCREEN_DESKTOP. Additional vid_fullscreen 2 is
implemented, it uses SDL_WINDOW_FULLSCREEN to create the fullscreen
area.
TL;DR: Use vid_fullscreen 1 to keep the current resolution or use
vid_fullscreen 2 to switch the resolution.
Implementation details: The whole fullscreen stuff is a horrible mess.
Like generations of hackers before me I'm not desperated enough to clean
it up. GLimp_InitGraphics() is modified to take the fullscreen mode as
an integer and not as a boolean. That's a change to the renderer API.
In GLimp_InitGraphics() the needed SDL fullscreen mode flag is
determined once at the top and just used further down below. That saves
dome SDL1 <-> SDL2 compatibility cruft. IsFullscreen() was modified to
return the actual fullscreen mode and not just if fullscreen is enabled.
if that cvar is set to 1, particles aren't rendered as nice circles, but
as squares, like in the software renderer or in Quake1.
Also documented it in cvarlist.md and fixed some typos there
The model shadows are rendered after all entities are rendered.
This fixes them making entity brushes below them translucent (#194)
The model rendering code used lots of global variables, many of them
totally superfluous (esp. currententity, currentmodel).
I refactored the code to use less global variables (this was at least
partly needed to render the shadows later).
So this looks like lots of changes, but many of them are just using
"entity" instead of "currententity" or "model" instead of "currentmodel"
Like GL1 gl_shadows + gl_stencilshadows: no shadow volumes, but looks
ok apart from standing over edges
The gl_stencilshadows cvar isn't used in GL3, it always uses the stencil
buffer if available (and if gl_shadows != 0)
This still needs performance optimizations: Like the GL1 impl it takes
lots of draw calls per model, it could be done with one per model like
when rendering the actual model.
