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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 7350 | leency | 1 | AppTitle "3D Cube Demo","hasta la vista" |
| 2 | While f$<>"1" And f$<>"2" |
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| 3 | f$=Input("Fullscreen (1) or Windowed? (2)") |
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| 4 | If f$="1" |
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| 5 | Graphics 320,240,16,1 |
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| 6 | EndIf |
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| 7 | If f$="2" |
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| 8 | Graphics 320,240,16,2 |
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| 9 | EndIf |
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| 10 | Wend |
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| 11 | |||
| 12 | SetBuffer BackBuffer() |
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| 13 | |||
| 14 | ; -- init texturemapper |
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| 15 | texturefile$="wall3.bmp" |
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| 16 | If FileType(texturefile$)=1 Then ; if it exists then load it... |
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| 17 | txt=LoadImage(texturefile$); use any 256*256 pixel texture |
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| 18 | Else |
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| 19 | txt=CreateImage(256,256) ; else create one on the fly |
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| 20 | SetBuffer ImageBuffer(txt) |
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| 21 | For i=0 To 255 |
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| 22 | Color i,255-i,0 |
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| 23 | Line 255-i,0,255,i |
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| 24 | Color 255,255-i,255-i |
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| 25 | Line 0,255-i,i,255 |
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| 26 | Next |
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| 27 | SetBuffer BackBuffer() |
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| 28 | EndIf |
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| 29 | Global imgtxt=ImageBuffer(txt) |
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| 30 | |||
| 31 | Dim Lefttable%(480, 2), Righttable%(480, 2) ;Scan converter tables (make shure to reserve enough) |
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| 32 | Dim Polypoints%(3, 1) ; Array for polygon co-ords, 4 pairs(x,y) co -ords |
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| 33 | Global Miny%, Maxy% |
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| 34 | Global Pwidth%, Pheight% |
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| 35 | |||
| 36 | |||
| 37 | Pwidth = 63 Shl 16 ;original picture width in pixels -1 shl 16 |
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| 38 | Pheight = 63 Shl 16 ;original picture height in pixels -1 shl 16 |
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| 39 | |||
| 40 | ; eo init texturemapper |
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| 41 | |||
| 42 | Dim zbuffer(10000) ; maximum of 10k Quads (don't worry, would be too slow anyway :) ) |
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| 43 | |||
| 44 | ; Read in a mesh |
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| 45 | Restore building |
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| 46 | Read anz |
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| 47 | Dim xwww(anz),ywww(anz),zwww(anz) |
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| 48 | Dim xw(anz),yw(anz),zw(anz) |
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| 49 | |||
| 50 | For i=0 To anz |
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| 51 | Read xwww(i) |
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| 52 | Read ywww(i) |
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| 53 | Read zwww(i) |
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| 54 | Next |
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| 55 | |||
| 56 | a=0 |
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| 57 | |||
| 58 | alpha=1 |
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| 59 | beta=1 |
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| 60 | gamma=1 |
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| 61 | |||
| 62 | zoom=-500 |
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| 63 | |||
| 64 | ; MMMMMMMMMMMMMMMMMMMMMMMMMmmmmmain |
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| 65 | |||
| 66 | While KeyDown(1)=0 |
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| 67 | |||
| 68 | Miny% = 32767 |
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| 69 | Maxy% = 0 |
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| 70 | |||
| 71 | Color 0,0,0 |
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| 72 | Rect 0,0,320,240,1 |
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| 73 | |||
| 74 | a=a+1.0 ; automatic rotation... |
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| 75 | If a>359.9 Then a=0 |
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| 76 | alpha=a |
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| 77 | beta=a |
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| 78 | gamma=a+a Mod 360 |
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| 79 | |||
| 80 | mausy#=0.1+(MouseY()/50.0) |
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| 81 | ;mausy#=2.0 |
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| 82 | For i=0 To anz |
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| 83 | xl1#=zwww(i)*Sin(gamma)+xwww(i)*Cos(gamma) |
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| 84 | yl1#=ywww(i) |
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| 85 | zl1#=zwww(i)*Cos(gamma)-xwww(i)*Sin(gamma) |
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| 86 | |||
| 87 | xl2#=xl1 |
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| 88 | yl2#=yl1*Cos(beta)-zl1*Sin(beta) |
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| 89 | zl2#=yl1*Sin(beta)+zl1*Cos(beta) |
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| 90 | |||
| 91 | xl3#=(yl2*Sin(alpha)+xl2*Cos(alpha)) |
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| 92 | yl3#=(yl2*Cos(alpha)-xl2*Sin(alpha)) |
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| 93 | zl3#=(zl2) |
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| 94 | |||
| 95 | ; xl3#=xwww(i) |
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| 96 | ; yl3#=ywww(i) |
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| 97 | ; zl3#=zwww(i) |
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| 98 | |||
| 99 | If yloc# - Zoom <> 0 Then yloc = Int(yl3 ) * 200 / (zl3 - Zoom) |
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| 100 | If xloc# - Zoom <> 0 Then xloc = Int(xl3 ) * 200 / (zl3 - Zoom) |
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| 101 | |||
| 102 | xw(i)=((mausy#)*xloc) +160 |
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| 103 | yw(i)=((mausy#)*yloc) +120 |
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| 104 | zw(i)=(zl3+256) |
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| 105 | Next |
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| 106 | |||
| 107 | ; z-sorting... |
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| 108 | For i=0 To 10000 |
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| 109 | zbuffer(i)=-1 |
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| 110 | Next |
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| 111 | For i=0 To anz-3 Step 4 |
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| 112 | If zw(i)>=0 ; clip Quads behind Camera |
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| 113 | zwmax=zw(i) |
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| 114 | If zwmax |
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| 115 | If zwmax |
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| 116 | If zwmax |
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| 117 | While zbuffer(zwmax)<>-1 And zwmax<10000 |
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| 118 | zwmax=zwmax+1 |
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| 119 | Wend |
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| 120 | zbuffer(zwmax)=i |
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| 121 | EndIf |
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| 122 | Next |
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| 123 | |||
| 124 | LockBuffer ImageBuffer(txt) |
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| 125 | LockBuffer BackBuffer() |
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| 126 | |||
| 127 | For i2=10000 To 0 Step -1 ; reading quads in z-order from far to near |
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| 128 | i=zbuffer(i2) |
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| 129 | |||
| 130 | If i>-1 And i< anz-2 ; if it isn't -1 then it's a Quad Point 1 ID |
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| 131 | ; Mapping... |
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| 132 | GetPolygonPoints(i) |
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| 133 | FindSmallLargeY() |
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| 134 | X1% = Polypoints%(0, 0) |
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| 135 | Y1% = Polypoints%(0, 1) |
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| 136 | X2% = Polypoints%(1, 0) |
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| 137 | Y2% = Polypoints%(1, 1) |
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| 138 | ScanConvert(X1%, Y1%, X2%, Y2%, 1) ;scan top of picture |
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| 139 | X1% = Polypoints%(1, 0) |
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| 140 | Y1% = Polypoints%(1, 1) |
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| 141 | X2% = Polypoints%(2, 0) |
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| 142 | Y2% = Polypoints%(2, 1) |
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| 143 | ScanConvert(X1%, Y1%, X2%, Y2%, 2) ;scan Right of picture |
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| 144 | X1% = Polypoints%(2, 0) |
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| 145 | Y1% = Polypoints%(2, 1) |
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| 146 | X2% = Polypoints%(3, 0) |
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| 147 | Y2% = Polypoints%(3, 1) |
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| 148 | ScanConvert(X1%, Y1%, X2%, Y2%, 3) ;scan bottom of picture |
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| 149 | X1% = Polypoints%(3, 0) |
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| 150 | Y1% = Polypoints%(3, 1) |
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| 151 | X2% = Polypoints%(0, 0) |
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| 152 | Y2% = Polypoints%(0, 1) |
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| 153 | ScanConvert(X1%, Y1%, X2%, Y2%, 4) ;scan Left of picture |
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| 154 | |||
| 155 | TextureMap() |
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| 156 | EndIf |
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| 157 | Next |
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| 158 | |||
| 159 | UnlockBuffer BackBuffer() |
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| 160 | UnlockBuffer ImageBuffer(txt) |
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| 161 | |||
| 162 | Color 0,255,0 |
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| 163 | Text 20,20,"Move Mouse" |
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| 164 | |||
| 165 | Flip 0 |
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| 166 | Wend |
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| 167 | |||
| 168 | End |
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| 169 | |||
| 170 | |||
| 171 | |||
| 172 | |||
| 173 | |||
| 174 | |||
| 175 | ; --- texture mapping functions |
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| 176 | |||
| 177 | Function GetPolygonPoints(ilocal%) ; initially read in a rectangle |
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| 178 | For Count% = 0 To 3 |
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| 179 | Polypoints%(Count%, 0) = xw(ilocal%+Count%) |
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| 180 | Polypoints%(Count%, 1) = yw(ilocal%+Count%) |
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| 181 | Next |
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| 182 | End Function |
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| 183 | |||
| 184 | Function FindSmallLargeY() |
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| 185 | For Count% = 0 To 3 |
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| 186 | Ycoord% = Polypoints%(Count%, 1) |
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| 187 | If Ycoord% < Miny% Then ; is this the New lowest y co-ord? |
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| 188 | Miny% = Ycoord% ; Yes... |
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| 189 | End If |
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| 190 | If Ycoord% > Maxy% Then ; is this the New highest y co-ord? |
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| 191 | Maxy% = Ycoord% ; Yes... |
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| 192 | End If |
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| 193 | Next |
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| 194 | End Function |
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| 195 | |||
| 196 | Function ScanConvert (X1%, Y1%, X2%, Y2%, Pside) |
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| 197 | If Y2% < Y1% Then |
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| 198 | temp%=X1% : X1%=X2% : X2%=temp% |
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| 199 | temp%=Y1% : Y1%=Y2% : Y2%=temp% |
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| 200 | Lineheight% = (Y2% - Y1%) |
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| 201 | ScanLeftSide(X1%, X2%, Y1%, Lineheight%, Pside) |
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| 202 | Else |
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| 203 | Lineheight% = (Y2% - Y1%) |
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| 204 | ScanRightSide(X1%, X2%, Y1%, Lineheight%, Pside) |
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| 205 | End If |
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| 206 | End Function |
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| 207 | |||
| 208 | Function ScanLeftSide (X1%, X2%, Ytop%, Lineheight%, Pside) |
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| 209 | Lineheight% = Lineheight% + 1 ; prevent divide by zero |
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| 210 | Xadd = (X2% - X1%) Shl 16 |
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| 211 | Xadd = Xadd / Lineheight% |
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| 212 | |||
| 213 | |||
| 214 | If Pside = 1 Then |
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| 215 | Px = Pwidth% - 1 |
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| 216 | Py = 0 |
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| 217 | Pxadd = -Pwidth% / Lineheight% |
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| 218 | Pyadd = 0 |
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| 219 | End If |
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| 220 | If Pside = 2 Then |
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| 221 | Px = Pwidth% |
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| 222 | Py = Pheight% |
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| 223 | Pxadd = 0 |
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| 224 | Pyadd = -Pheight% / Lineheight% |
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| 225 | End If |
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| 226 | If Pside = 3 Then |
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| 227 | Px = 0 |
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| 228 | Py = Pheight% |
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| 229 | Pxadd = Pwidth% / Lineheight% |
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| 230 | Pyadd = 0 |
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| 231 | End If |
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| 232 | If Pside = 4 Then |
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| 233 | Px = 0 |
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| 234 | Py = 0 |
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| 235 | Pxadd = 0 |
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| 236 | Pyadd = Pheight% / Lineheight% |
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| 237 | End If |
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| 238 | |||
| 239 | x = X1% Shl 16 |
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| 240 | For y% = 0 To Lineheight% |
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| 241 | Ytopy%=Ytop%+y% |
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| 242 | If Ytopy%<0 Then Ytopy%=0 |
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| 243 | Lefttable(Ytopy%, 0) = x Sar 16 ;polygon x |
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| 244 | Lefttable(Ytopy%, 1) = Px ;picture x |
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| 245 | Lefttable(Ytopy%, 2) = Py ;picture y |
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| 246 | x = x + Xadd ;Next polygon x |
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| 247 | Px = Px + Pxadd ;Next picture x |
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| 248 | Py = Py + Pyadd ;Next picture y |
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| 249 | Next |
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| 250 | End Function |
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| 251 | |||
| 252 | Function ScanRightSide (X1%, X2%, Ytop%, Lineheight%, Pside) |
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| 253 | Lineheight% = Lineheight% + 1 ; No divide by zero |
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| 254 | Xadd = (X2% - X1%) Shl 16 |
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| 255 | Xadd = Xadd / Lineheight% |
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| 256 | |||
| 257 | If Pside = 1 Then |
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| 258 | Px = 0 |
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| 259 | Py = 0 |
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| 260 | Pxadd = Pwidth% / Lineheight% |
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| 261 | Pyadd = 0 |
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| 262 | End If |
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| 263 | If Pside = 2 Then |
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| 264 | Px = Pwidth% |
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| 265 | Py = 0 |
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| 266 | Pxadd = 0 |
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| 267 | Pyadd = Pheight% / Lineheight% |
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| 268 | End If |
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| 269 | If Pside = 3 Then |
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| 270 | Px = Pwidth% |
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| 271 | Py = Pheight% |
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| 272 | Pxadd = -Pwidth% / Lineheight% |
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| 273 | Pyadd = 0 |
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| 274 | End If |
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| 275 | If Pside = 4 Then |
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| 276 | Px = 0 |
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| 277 | Py = Pheight% |
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| 278 | Pxadd = 0 |
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| 279 | Pyadd = -Pheight% / Lineheight% |
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| 280 | End If |
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| 281 | |||
| 282 | x = X1% Shl 16 |
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| 283 | For y% = 0 To Lineheight% |
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| 284 | Ytopy%=Ytop%+y% |
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| 285 | If Ytopy%<0 Then Ytopy%=0 |
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| 286 | Righttable(Ytopy%, 0) = x Sar 16 ;polygon x |
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| 287 | Righttable(Ytopy%, 1) = Px ;picture x |
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| 288 | Righttable(Ytopy%, 2) = Py ;picture y |
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| 289 | x = x + Xadd ;Next polygon x |
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| 290 | Px = Px + Pxadd ;Next picture x |
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| 291 | Py = Py + Pyadd ;Next picture y |
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| 292 | Next |
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| 293 | End Function |
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| 294 | |||
| 295 | |||
| 296 | |||
| 297 | |||
| 298 | |||
| 299 | Function TextureMap() |
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| 300 | For y% = Miny% To Maxy% |
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| 301 | If y>0 And y<=239 |
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| 302 | Polyx1% = Lefttable((y%), 0) |
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| 303 | Px1 = Lefttable(y%, 1) |
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| 304 | Py1 = Lefttable(y%, 2) |
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| 305 | |||
| 306 | Polyx2% = Righttable((y%), 0) |
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| 307 | Px2 = Righttable(y%, 1) |
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| 308 | Py2 = Righttable(y%, 2) |
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| 309 | Linewidth% = Polyx2% - Polyx1% |
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| 310 | Linewidth%=Linewidth% Or 1 |
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| 311 | Pxadd = ((Px2 - Px1)) / Linewidth% |
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| 312 | Pyadd = ((Py2 - Py1)) / Linewidth% |
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| 313 | |||
| 314 | For x% = Polyx1% To Polyx2% |
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| 315 | If x>0 And x<=319 |
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| 316 | Col%=ReadPixelFast((Px1 Shr 16),(Py1 Shr 16),imgtxt) |
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| 317 | WritePixelFast x%,y%,Col% |
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| 318 | EndIf |
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| 319 | Px1 = Px1 + Pxadd |
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| 320 | Py1 = Py1 + Pyadd |
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| 321 | Next |
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| 322 | EndIf |
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| 323 | Next |
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| 324 | End Function |
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| 325 | |||
| 326 | |||
| 327 | |||
| 328 | .building |
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| 329 | Data 23 ; number of pts -1 |
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| 330 | ; x y z |
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| 331 | |||
| 332 | Data -100,-100,-100 |
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| 333 | Data -100,100,-100 |
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| 334 | Data -100,100,100 |
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| 335 | Data -100,-100,100 |
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| 336 | |||
| 337 | Data -100,-100,-100 |
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| 338 | Data -100,-100,100 |
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| 339 | Data 100,-100, 100 |
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| 340 | Data 100,-100, -100 |
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| 341 | |||
| 342 | Data -100,100,-100 |
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| 343 | Data 100,100,-100 |
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| 344 | Data 100,100, 100 |
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| 345 | Data -100,100, 100 |
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| 346 | |||
| 347 | Data 100,-100,-100 |
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| 348 | Data 100,-100,100 |
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| 349 | Data 100,100,100 |
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| 350 | Data 100,100,-100 |
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| 351 | |||
| 352 | Data -100,100,100 |
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| 353 | Data 100,100,100 |
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| 354 | Data 100,-100,100 |
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| 355 | Data -100,-100,100 |
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| 356 | |||
| 357 | Data -100,100,-100 |
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| 358 | Data -100,-100,-100 |
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| 359 | Data 100,-100,-100 |
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| 360 | Data 100,100,-100 |