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cobra mk3

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This commit is contained in:
Irmen de Jong 2020-09-10 01:31:21 +02:00
parent 836509c1d1
commit 18f5963b09
1 changed files with 15 additions and 10 deletions
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25
examples/cx16/cube3d-gfx.p8 → examples/cx16/cobramk3-gfx.p8
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@ -3,10 +3,13 @@
main {
; Ship model data converted from BBC Elite's Cobra MK 3
; downloaded from http://www.elitehomepage.org/archive/index.htm
; vertices
word[] xcoor = [ -100, -100, -100, -100, 100, 100, 100, 100 ]
word[] ycoor = [ -100, -100, 100, 100, -100, -100, 100, 100 ]
word[] zcoor = [ -100, 100, -100, 100, -100, 100, -100, 100 ]
word[] xcoor = [ 32,-32,0,-120,120,-88,88,128,-128,0,-32,32,-36,-8,8,36,36,8,-8,-36,-1,-1,-80,-80,-88,80,88,80,1,1,1,1,-1,-1 ]
word[] ycoor = [ 0,0,26,-3,-3,16,16,-8,-8,26,-24,-24,8,12,12,8,-12,-16,-16,-12,-1,-1,-6,6,0,6,0,-6,-1,-1,1,1,1,1 ]
word[] zcoor = [ 76,76,24,-8,-8,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,-40,76,90,-40,-40,-40,-40,-40,-40,76,90,76,90,76,90 ]
; storage for rotated coordinates
word[len(xcoor)] rotatedx
@ -14,9 +17,11 @@ main {
word[len(zcoor)] rotatedz
; edges
ubyte[] edgesFrom = [ 0, 2, 6, 4, 1, 3, 7, 5, 0, 2, 6, 4]
ubyte[] edgesTo = [ 2, 6, 4, 0, 3, 7, 5, 1, 1, 3, 7, 5]
ubyte[] edgesFrom = [ 0,1,0,10,1,0,2,0,4,0,4,7,2,1,1,3,8,3,2,5,6,5,6,16,15,14,14,18,13,12,12,26,25,25,22,23,22,20,28,21,20,28,29,30,31,30,32,20,21,20,20 ]
ubyte[] edgesTo = [ 1,2,2,11,10,11,6,6,6,4,7,11,5,5,3,5,10,8,9,9,9,8,7,17,16,15,17,19,18,13,19,27,26,27,23,24,24,28,29,29,21,30,31,31,33,32,33,32,33,33,29 ]
; TODO hidden surface removal - this needs surfaces data and surface normal calculations.
; TODO add all other Elite's ships, show their name, advance to next ship on keypress
sub start() {
uword anglex
@ -65,9 +70,9 @@ main {
ubyte @zp i
for i in 0 to len(xcoor)-1 {
; don't normalize by dividing by 128, instead keep some precision for perspective calc later
rotatedx[i] = (Axx*xcoor[i] + Axy*ycoor[i] + Axz*zcoor[i])
rotatedy[i] = (Ayx*xcoor[i] + Ayy*ycoor[i] + Ayz*zcoor[i])
rotatedz[i] = (Azx*xcoor[i] + Azy*ycoor[i] + Azz*zcoor[i])
rotatedx[i] = Axx*xcoor[i] + Axy*ycoor[i] + Axz*zcoor[i]
rotatedy[i] = Ayx*xcoor[i] + Ayy*ycoor[i] + Ayz*zcoor[i]
rotatedz[i] = Azx*xcoor[i] + Azy*ycoor[i] + Azz*zcoor[i]
}
}
@ -79,8 +84,8 @@ main {
for i in len(edgesFrom) -1 downto 0 {
ubyte @zp vFrom = edgesFrom[i]
ubyte @zp vTo = edgesTo[i]
word persp1 = 256 + rotatedz[vFrom]/256
word persp2 = 256 + rotatedz[vTo]/256
word persp1 = 200 + rotatedz[vFrom]/256
word persp2 = 200 + rotatedz[vTo]/256
cx16.r0 = rotatedx[vFrom] / persp1 + screen_width/2 as uword
cx16.r1 = rotatedy[vFrom] / persp1 + screen_height/2 as uword
cx16.r2 = rotatedx[vTo] / persp2 + screen_width/2 as uword