Yet another 'Mode7' stuff, but now is different!
This will allow you to have
high-quality Mode7 witchery at very
high framerate. This is archieved by using sprites to process a BG on a line-by-line scan, and modify every sprite (line) to archieve the effect we want.
BE ADVISED THAT:
1.- Rotations on the Z axis are not a thing here, due to how it works. (so, making a racing stuff is quite complicated)
2.- Expect some slowdowns if you process too much lines.
CHANGELOG:
12/04/2017 - Initial Release
Instructions:
To initialize it, you first need to setup the sprites that are going to be used for the Mode7:
LOAD "PRG1:UM7",FALSE
SPMIN=0 'The ID which the scan will begin
SPMAX=240 'The ID where the scan will stop
M7_SCAN SPMIN, SPMAX
Then, by using any algorithm you want, you have to modify the lines that you're going to use to create the effect you want. This, for example, will create a depth perspective similar to games like Mario Kart or F-Zero:
WDTH = 80
FOR I=SPMIN TO SPMAX
Y=I
M7_LINE I, 200, Y, -Y, I/WDTH, 1, 0, 0, 0, RGB(255,255,255)
NEXT
And this will create a wiggle effect:
WDTH = 80
A = (A+1) MOD 360
FOR I=SPMIN TO SPMAX
Y=I
M7_LINE I, 200+(SIN(RAD(A))*50), Y, -Y, 1, 1, 0, 0, 0, RGB(255,255,255)
INC A
NEXT
