gewlitys
94b52cea30
git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@277 8092fc87-c524-0410-9efc-e669fe64eaf9
32 lines
1.7 KiB
Plaintext
32 lines
1.7 KiB
Plaintext
Planet-rotate code rev3:
|
|
written by PhracturedBlue
|
|
Date: Nov 1, 2002
|
|
|
|
This is the code to make the planets spin when in orbit view.
|
|
The planet will zoom in (as in the 3do version)
|
|
Shield support is very preliminary, mosly becuase I have not figured
|
|
out how to get the 'look' right.
|
|
|
|
The planet rotation speed is controlled by ROTATION_TIME which is defined in plangen.c.
|
|
The default is '22' which gives a speed comparable to the DOS version of the game
|
|
|
|
The planet zoom speed is defined by PLANET_ZOOM_SPEED which is defined in pl_stuff.c
|
|
|
|
The lighting algorithm is really just a hack. All lighting code is in plangen.c
|
|
Currently, lighting is performed by placing the light source at a certain distance
|
|
(LIGHT_MULT) from the center of the planet (a value of 1 would place the light at
|
|
the planet's radius. (The angle is determined by the planet's position in orbit with
|
|
respect to the sun). The brightest poinnt will have the original color of the topo-map.
|
|
The light falls off as the cos(r^2/(LIGHT_RADIUS^2)).
|
|
The light can never be dimmer than AMBIENT_LIGHT
|
|
|
|
The shield is done in 2 parts: the halo and the planet-mask. Whether this is needed or
|
|
not, I don't know, but it gives a bit more flexibility in how the effect is applied.
|
|
|
|
The code works by blitting directly to an SDL_Surface, rather than using DrawBatch (and
|
|
the rendering thread). This gives a huge performance win (My P3-1000 went from ~40fps
|
|
using the DrawBatch to ~500fps using the current method). All lighting, planet tilt, and
|
|
sphere->plane mapping is precomputed into the 'map_rotate' and 'phong' tables (in plangen.c)
|
|
To optimize performance (there is no floating-poinnt code used during the actual frame
|
|
generation)
|