I have the code for a working prototype in DBpro
as follows..
`PRESS SPACE TO:
`on LHS of screen, draw objects in dword space.
`on RHS, draw them with positions relative to "player" position
`check that player position loops around right.
sync on
sync rate 60:skipsyncmode=0:set display mode desktop width(),desktop height(),32,1 `STANDARD MODE
`sync rate 30:skipsyncmode=1:set display mode 848,480,32,1 `FOR YOUTUBE VID CAPTURE
autocam off
hide mouse
backdrop on:color backdrop 0
set camera aspect 1.66667
dim thing_posx(100) as dword
dim thing_posz(100) as dword
dim thing_color(100) as dword
for t=1 to 100
thing_posx(t)=rnd(255)<<24 `256=2^8 , 8+24=32
thing_posz(t)=rnd(255)<<24
`thing_color(t)=0xFF000000 OR rgb(rnd(255),rnd(255),rnd(255))
thing_color(t)=rgb(rnd(255),rnd(255),rnd(255))
next t
thing_color(0)=0xFFFFFF00 `make sure "player" is visible!
`now add terrain array (ground heights)
dim map_height(1023,1023) `whole map is 1024 square
dim map_tile(1023,1023) as byte `only need 4 values
for a=0 to 1023
for b=0 to 1023
`map_height(a,b)=rnd(255) `used rnd(255) so can easily get colour out if want to draw heightmap
map_height(a,b)=0.3* (rnd(50) +100*cos(50*a) +50*cos(40*a +50*b))
map_tile(a,b)=1+rnd(3) `tiles are numbered from 1-4
map_tile(a,b)=1+rnd(2) `no red
next b
next a
`make a square "launchpad", virus style.
for a=0 to 7:for b=0 to 7: map_tile(a,b)=2: next b:next a
for a=1 to 7:for b=1 to 7: map_height(a,b)=100.0: next b:next a
mat_divs=13 `13 squares - means that after cropping with box, 12x12 will be visible
mat_square_size=1<<22 `2^32 / 2^10, since whole world is dword (2^32) and divided into 1024x1024 squares.
subtract_factor=6*mat_square_size `(matrix size - mat square size)/2 =`6*mat square size
`subtract factor is taken from player position in order to find where from map array to take beginning corner of matrix from.
mat_view_size#=1000.0
conversion_factor#=mat_view_size#/(mat_square_size*12) `to convert from dword positions to float for positioning in DBP
`"real world" and rendering
mat_actual_size#=mat_view_size#*(13.0/12.0)
make matrix 1,mat_actual_size#,mat_actual_size#,13,13
`position matrix centrally.
position matrix 1,-0.5*mat_actual_size#,0.0,-0.5*mat_actual_size#
`load image "test2.bmp",1
draw_mat_tex() `for no media
`load image "test3a.bmp",1
prepare matrix texture 1,1,2,2 `2 by 2 mat tex.
`set matrix trim 1,0.01,0.01 `prevent tex bleeding due to filtering
set matrix texture 1,2,0 `no mipmap. stops adjacent matrix tiles (on tile map) bleeding into eachother
`downside is that lines look ugly
set matrix 1,0,1,0,0,0,0,0
`position camera above it so can see it. will be repositioning camera every frame anyway.
`position camera 0,1000,0
`fill mat with info to check it's viewable
for a=0 to 13
for b=0 to 13
set matrix height 1,a,b,map_height(a,b)
next b
next a
update matrix 1
`box object to disguise edges moving
make object box 100,mat_view_size#,-10.0*mat_view_size#,mat_view_size#
`single_pixel_image(100,50,0,0,200)
single_pixel_image(100,0,0,0,255)
texture object 100,100
set object 100,1,3,1,0,0,0,0
`player (red ball on ground)
make object sphere 1,20
single_pixel_image(2,255,0,0,255)
texture object 1,2
`make some other objects positioned near to the player.
single_pixel_image(101,100,100,100,255)
for t=1 to 20
thing_posx(t)=rnd(10*mat_square_size) + 10*mat_square_size
thing_posz(t)=rnd(10*mat_square_size)
`make object box 50+t,10,100,10
make object sphere 50+t,100
offset limb 50+t,0,0,50,0
texture object 50+t,101
next t
`make a skyscraper
t=20
thing_posx(t)=15*mat_square_size
thing_posz(t)=12*mat_square_size
delete object 50+t
wide#=4.0*mat_square_size*conversion_factor#
make object box 50+t,wide#,500,wide#
offset limb 50+t,0,0,200,0
texture object 50+t,101
`make a "virus" style ship object!
make object box 200,50,20,80
`ADD HELICOPTER BLADES AS A LIMB!
make object box 201,10,2,150
make mesh from object 201,201
add limb 201,1,201
delete mesh 201
rotate limb 201,1,0,90,0
make mesh from object 201,201
delete object 201
add limb 200,1,201
delete mesh 201
offset limb 200,1,0,25,0
speedx#=0.0
speedz#=0.0
speedy#=0.0
hi#=0.0
do
if keystate(35):helimode=1:totalthr#=thr# * defaultthrust#:endif `h for heli
`added line to set thrust is not really necessary.
`stops heli crashing when switch to heli mode.
if keystate(31):helimode=0:endif `s for ship
if helimode
turnsmooth#=50.0
defaultthrust#=0.35 `should make this vary - increase when get close to ground => auto terrain following
clickthrust#=0.5
thrustsmooth#=50.0
pointsmooth#=10.0
show limb 200,1 `show helicopter blades
text 0,100,"HELICOPTER MODE (press S for spaceship)"
else
turnsmooth#=10.0
defaultthrust#=0.0
clickthrust#=1.0
thrustsmooth#=1.0
pointsmooth#=1.0
hide limb 200,1
text 0,100,"SPACESHIP MODE (press H for helicopter)"
endif
`text 0,100,str$(helimode)
text 0,120,"THRUST="+str$(totalthr#)
`MOUSE TO TILT SHIP `t denotes target (am adding smoothing to get mx,mz from these)
tmx#=tmx#+mousemovex()
tmz#=tmz#-mousemovey()
msq#=tmx#*tmx#+tmz#*tmz#
m#=sqrt(msq#)
if m#>100.0
tmx#=(tmx#/m#)*100.0
tmz#=(tmz#/m#)*100.0
endif
mx#=curvevalue(tmx#,mx#,pointsmooth#)
mz#=curvevalue(tmz#,mz#,pointsmooth#)
`get length of this vector
msq#=mx#*mx#+mz#*mz#
m#=sqrt(msq#)
`draw circle with cursor in
circle 50,50,48
dot 50+(50.0/100.0)*mx#, 50-(50.0/100.0)*mz#
dot 50+(50.0/100.0)*tmx#, 50-(50.0/100.0)*tmz# ,0xFFFF0000 `red dot for target
ya#=atanfull(mx#,mz#)
rotate object 200,m#,ya#,0.0
`want to 1st rotate to get "spin"
`then rotate to tilt to thrust angle (from horizontal)
`then rotate to "point" in thrust direction (viewed from above)
`for obj on ground this is
`1st "spin"
`then ground slope elevation
`then slope direction.
`this works!!
tu#=curveangle(ya#,tu#,turnsmooth#)
rotate limb 200,0,0,wrapvalue(tu#-ya#),0
`helicopter blades
br#=wrapvalue(br#+10.0) `blade rotation
rotate limb 200,1,0,wrapvalue(br#-ya#),0
`movespeed=1<<23 `bitshift<< makes bigger! (this number can be anything)
movespeed=1<<18
inc thing_posx(0), -movespeed*(leftkey()-rightkey())
inc thing_posz(0), movespeed*(upkey()-downkey())
mc=mouseclick()
thr#=2000.0
`speedx#=0.95*speedx#+thr#*mx#*mc `small angle approximation!
`speedz#=0.95*speedz#+thr#*mz#*mc
targetthrust#=thr# * ( clickthrust#*mc + defaultthrust#)
totalthr#=curvevalue( targetthrust# , totalthr# , thrustsmooth# )
speedx#=0.95*speedx#+ totalthr# *mx#*(sin(m#)/m#)*(180.0/3.14) `NOTE THAT CAN INCORPORATE (180/PI) INTO THRUST CONSTANT
speedz#=0.95*speedz#+ totalthr# *mz#*(sin(m#)/m#)*(180.0/3.14) `FOR FEWER CALCULATIONS. ALSO SIN NEED ONLY CALC ONCE.
inc thing_posx(0),speedx#
inc thing_posz(0),speedz#
`speedy#=0.95*speedy# + conversion_factor#*thr#*mc*(180.0/3.14) - 1.0 `should use proper trig! last part is gravity
speedy#=0.95*speedy# + conversion_factor#*totalthr# *cos(m#)*(180.0/3.14) - 1.0
inc hi#,speedy#
pgridx=thing_posx(0)>>22
pgridz=thing_posz(0)>>22
`gridx=(thing_posx(0)-subtract_factor)>>22 `not player grid, but grid where want to start reading landscape info to matrix
`gridz=(thing_posz(0)-subtract_factor)>>22
`can also achieve this by using (playergrid-6) &&1023
gridx=(pgridx-6)&&1023
gridz=(pgridz-6)&&1023
`using bitshift to right 22, grid goes from 0-1023.
`1024=2^10 22+10=32 (bits in a dword!)
`should only update when grid square changes.
`after that maybe use shifting- maybe faster.
if last_gridx<>gridx or last_gridz<>gridz
for a=0 to 13
for b=0 to 13
set matrix height 1,a,b,map_height((a+gridx)&&1023,(b+gridz)&&1023)
next b
next a
for a=0 to 12
for b=0 to 12
set matrix tile 1,a,b,map_tile((a+gridx)&&1023,(b+gridz)&&1023)
next b
next a
update matrix 1
last_gridx=gridx
last_gridz=gridz
endif
`POSITION CAMERA USING "REMAINDER"
`cx=-2097152+ ( (thing_posx(0)-subtract_factor) && 4194303 ) `2^22 -1 . =0x4FFFFF ?!
`cz=-2097152+ ( (thing_posz(0)-subtract_factor) && 4194303 )
cx=-2097152+ ( thing_posx(0) && 4194303 ) `dur! subtract factor && ... =0
cz=-2097152+ ( thing_posz(0) && 4194303 )
camx#=conversion_factor#*cx `bit lame that are getting +ve and -ve values. perhaps should have mat corner at origin.
camz#=conversion_factor#*cz
`position camera camx#,1000,camz#-400
position object 100,camx#,0,camz#
position object 1, camx#,ground_height(thing_posx(0),thing_posz(0) ),camz#
`position object 200, camx#,100,camz#
gh#=50.0+ground_height(thing_posx(0),thing_posz(0) )
if hi#<gh#:hi#=gh#:speedy#=0.0:endif `really should be some other speed if moving horizontally..
position object 200, camx#,hi#,camz#
position camera camx#,hi#,camz#-995
set camera clip 0,1,0,0,camz#-0.5*mat_view_size#,0,0,1
`POSITION OTHER OBJECTS! should decide whether to show (are on visible matrix)
`do that later.
for t=1 to 20
dx=thing_posx(t)-thing_posx(0)
dz=thing_posz(t)-thing_posz(0)
`tx#=(conversion_factor#*dx) +camx#
`tz#=(conversion_factor#*dz) +camz#
tx#=conversion_factor#*(dx+cx) `equivalent to above
tz#=conversion_factor#*(dz+cz)
position object 50+t,tx#,ground_height(thing_posx(t),thing_posz(t) ),tz#
next t
text 0,140,"DWORD CO-ORDS="+str$(thing_posx(0))+","+str$(thing_posz(0))
text 0,150,"GRID CO-ORDS="+str$(gridx)+","+str$(gridz)
text 0,170,str$(screen fps())+" FPS"
`text 100,20,str$(conversion_factor#)
`OLD TEST THING ===========================================
IF SPACEKEY()
`DRAW DOTS TO SCREEN
box 0,50,256,50+256,0xFF000080,0xFF000080,0xFF000080,0 xFF000080
for t=0 to 10
spx=thing_posx(t)>>24 `gets 0-255 (2^8)
spz=50+(thing_posz(t)>>24)
dot spx,spz,thing_color(t)
next y
`NOW DRAW WITH POSITIONS RELATIVE TO PLAYER!
box 300,50,300+256,50+256,0xFF000080,0xFF000080,0xFF00 0080,0xFF000080
for t=0 to 10
REMSTART
spx=300+((thing_posx(t)-thing_posx(0))>>24) `gets 0-255 (2^8)
spz=50+((thing_posz(t)-thing_posz(0))>>24)
REMEND
`put player in middle
spx=300+((thing_posx(t)-thing_posx(0)-(1<<31))>>24) `gets 0-255 (2^8)
spz=50+((thing_posz(t)-thing_posz(0)-(1<<31))>>24)
dot spx,spz,thing_color(t)
next y
ENDIF
`================================================= ===========
if skipsyncmode
skipsync=1-skipsync
if skipsync then sync
else
sync
endif
loop
end
function ground_height(x as dword, z as dword)
xg=x>>22
zg=z>>22
xgp=(xg+1)&&1023
zgp=(zg+1)&&1023
rx=x && 4194303
rz=z && 4194303
fx#=rx / (1.0*4194304)
fz#=rz / (1.0*4194304)
`text 100,100,str$(fx#)+","+str$(fz#)
height#=(map_height(xg,zg)*(1.0-fx#)*(1.0-fz#) + map_height(xgp,zg)*fx#*(1.0-fz#) +map_height(xg,zgp)*(1.0-fx#)*fz# +map_height(xgp,zgp)*fx#*fz#)
`^^ simplified version : mat square is treated as surface formed by straight lines in x, and z direction when viewed from above,
`connecting the square polygon grid. that there are actually 2 flat triangles is ignored.
endfunction height#
function single_pixel_image(imagenum,red,green,blue,alpha)
#constant temp_memblocknum 1
make memblock temp_memblocknum,16
write memblock dword temp_memblocknum,0,1
write memblock dword temp_memblocknum,4,1
write memblock dword temp_memblocknum,8,32
write memblock dword temp_memblocknum,12,rgba(red,green,blue,alpha)
make image from memblock imagenum,temp_memblocknum
delete memblock temp_memblocknum
endfunction
`RGBA function by Aaron Miller
function rgba(r,g,b,a)
c = (a and 0xff) << 24 or ((r and 0xff) << 16) or ((g and 0xff) << 8) or (b and 0xff)
endfunction c
`FOR NO MEDIA
function draw_mat_tex()
create bitmap 1,256,256
box 0,0,128,128,0xFFDFDFDF,0xFFFFFFFF,0xFFFFFFFF,0xFFE FEFEF
box 0,128,128,256,0xFF808080,0xFF808080,0xFF707070,0xF F808080
box 128,0,256,128,0xFF484848,0xFF606060,0xFF505050,0xF F606060
box 128,128,256,256,0xFFFF4040,0xFFFF4040,0xFFFF4040,0 xFFFF4040 `red tile. not currently used.
`graduated boxes. means can see seam between tiles even if same type
`should play with graduations for best effect. should i have opposite corners same colour?
`should all corners be different?
`lines
ink 0xFF606060,0
w=0 `width `CURRENTLY LINES SWITCHED OFF
box 0,0,w,256
box 0,0,256,w
box 0,128-w,256,128+w
box 128-w,0,128+w,256
box 0,256-w,256,256
box 256-w,0,256,256
ink 0xFFFFFFFF,0
get image 1,0,0,256,256
`save image "testx.bmp",1
delete bitmap 1
endfunction
Source: http://forum.xda-developers.com/showthread.php?t=1762369&goto=newpost
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