360 lines
7.8 KiB
BlitzBasic
360 lines
7.8 KiB
BlitzBasic
AppTitle "3D Cube Demo","hasta la vista"
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While f$<>"1" And f$<>"2"
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f$=Input("Fullscreen (1) or Windowed? (2)")
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If f$="1"
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Graphics 320,240,16,1
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EndIf
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If f$="2"
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Graphics 320,240,16,2
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EndIf
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Wend
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SetBuffer BackBuffer()
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; -- init texturemapper
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texturefile$="wall3.bmp"
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If FileType(texturefile$)=1 Then ; if it exists then load it...
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txt=LoadImage(texturefile$); use any 256*256 pixel texture
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Else
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txt=CreateImage(256,256) ; else create one on the fly
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SetBuffer ImageBuffer(txt)
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For i=0 To 255
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Color i,255-i,0
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Line 255-i,0,255,i
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Color 255,255-i,255-i
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Line 0,255-i,i,255
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Next
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SetBuffer BackBuffer()
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EndIf
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Global imgtxt=ImageBuffer(txt)
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Dim Lefttable%(480, 2), Righttable%(480, 2) ;Scan converter tables (make shure to reserve enough)
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Dim Polypoints%(3, 1) ; Array for polygon co-ords, 4 pairs(x,y) co -ords
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Global Miny%, Maxy%
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Global Pwidth%, Pheight%
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Pwidth = 63 Shl 16 ;original picture width in pixels -1 shl 16
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Pheight = 63 Shl 16 ;original picture height in pixels -1 shl 16
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; eo init texturemapper
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Dim zbuffer(10000) ; maximum of 10k Quads (don't worry, would be too slow anyway :) )
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; Read in a mesh
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Restore building
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Read anz
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Dim xwww(anz),ywww(anz),zwww(anz)
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Dim xw(anz),yw(anz),zw(anz)
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For i=0 To anz
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Read xwww(i)
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Read ywww(i)
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Read zwww(i)
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Next
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a=0
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alpha=1
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beta=1
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gamma=1
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zoom=-500
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; MMMMMMMMMMMMMMMMMMMMMMMMMmmmmmain
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While KeyDown(1)=0
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Miny% = 32767
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Maxy% = 0
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Color 0,0,0
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Rect 0,0,320,240,1
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a=a+1.0 ; automatic rotation...
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If a>359.9 Then a=0
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alpha=a
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beta=a
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gamma=a+a Mod 360
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mausy#=0.1+(MouseY()/50.0)
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;mausy#=2.0
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For i=0 To anz
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xl1#=zwww(i)*Sin(gamma)+xwww(i)*Cos(gamma)
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yl1#=ywww(i)
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zl1#=zwww(i)*Cos(gamma)-xwww(i)*Sin(gamma)
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xl2#=xl1
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yl2#=yl1*Cos(beta)-zl1*Sin(beta)
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zl2#=yl1*Sin(beta)+zl1*Cos(beta)
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xl3#=(yl2*Sin(alpha)+xl2*Cos(alpha))
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yl3#=(yl2*Cos(alpha)-xl2*Sin(alpha))
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zl3#=(zl2)
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; xl3#=xwww(i)
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; yl3#=ywww(i)
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; zl3#=zwww(i)
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If yloc# - Zoom <> 0 Then yloc = Int(yl3 ) * 200 / (zl3 - Zoom)
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If xloc# - Zoom <> 0 Then xloc = Int(xl3 ) * 200 / (zl3 - Zoom)
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xw(i)=((mausy#)*xloc) +160
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yw(i)=((mausy#)*yloc) +120
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zw(i)=(zl3+256)
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Next
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; z-sorting...
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For i=0 To 10000
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zbuffer(i)=-1
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Next
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For i=0 To anz-3 Step 4
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If zw(i)>=0 ; clip Quads behind Camera
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zwmax=zw(i)
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If zwmax<zw(i+1) Then zwmax=zw(i+1)
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If zwmax<zw(i+2) Then zwmax=zw(i+2)
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If zwmax<zw(i+3) Then zwmax=zw(i+3)
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While zbuffer(zwmax)<>-1 And zwmax<10000
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zwmax=zwmax+1
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Wend
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zbuffer(zwmax)=i
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EndIf
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Next
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LockBuffer ImageBuffer(txt)
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LockBuffer BackBuffer()
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For i2=10000 To 0 Step -1 ; reading quads in z-order from far to near
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i=zbuffer(i2)
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If i>-1 And i< anz-2 ; if it isn't -1 then it's a Quad Point 1 ID
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; Mapping...
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GetPolygonPoints(i)
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FindSmallLargeY()
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X1% = Polypoints%(0, 0)
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Y1% = Polypoints%(0, 1)
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X2% = Polypoints%(1, 0)
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Y2% = Polypoints%(1, 1)
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ScanConvert(X1%, Y1%, X2%, Y2%, 1) ;scan top of picture
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X1% = Polypoints%(1, 0)
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Y1% = Polypoints%(1, 1)
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X2% = Polypoints%(2, 0)
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Y2% = Polypoints%(2, 1)
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ScanConvert(X1%, Y1%, X2%, Y2%, 2) ;scan Right of picture
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X1% = Polypoints%(2, 0)
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Y1% = Polypoints%(2, 1)
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X2% = Polypoints%(3, 0)
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Y2% = Polypoints%(3, 1)
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ScanConvert(X1%, Y1%, X2%, Y2%, 3) ;scan bottom of picture
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X1% = Polypoints%(3, 0)
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Y1% = Polypoints%(3, 1)
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X2% = Polypoints%(0, 0)
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Y2% = Polypoints%(0, 1)
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ScanConvert(X1%, Y1%, X2%, Y2%, 4) ;scan Left of picture
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TextureMap()
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EndIf
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Next
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UnlockBuffer BackBuffer()
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UnlockBuffer ImageBuffer(txt)
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Color 0,255,0
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Text 20,20,"Move Mouse"
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Flip 0
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Wend
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End
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; --- texture mapping functions
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Function GetPolygonPoints(ilocal%) ; initially read in a rectangle
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For Count% = 0 To 3
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Polypoints%(Count%, 0) = xw(ilocal%+Count%)
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Polypoints%(Count%, 1) = yw(ilocal%+Count%)
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Next
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End Function
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Function FindSmallLargeY()
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For Count% = 0 To 3
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Ycoord% = Polypoints%(Count%, 1)
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If Ycoord% < Miny% Then ; is this the New lowest y co-ord?
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Miny% = Ycoord% ; Yes...
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End If
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If Ycoord% > Maxy% Then ; is this the New highest y co-ord?
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Maxy% = Ycoord% ; Yes...
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End If
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Next
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End Function
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Function ScanConvert (X1%, Y1%, X2%, Y2%, Pside)
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If Y2% < Y1% Then
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temp%=X1% : X1%=X2% : X2%=temp%
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temp%=Y1% : Y1%=Y2% : Y2%=temp%
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Lineheight% = (Y2% - Y1%)
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ScanLeftSide(X1%, X2%, Y1%, Lineheight%, Pside)
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Else
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Lineheight% = (Y2% - Y1%)
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ScanRightSide(X1%, X2%, Y1%, Lineheight%, Pside)
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End If
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End Function
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Function ScanLeftSide (X1%, X2%, Ytop%, Lineheight%, Pside)
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Lineheight% = Lineheight% + 1 ; prevent divide by zero
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Xadd = (X2% - X1%) Shl 16
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Xadd = Xadd / Lineheight%
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If Pside = 1 Then
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Px = Pwidth% - 1
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Py = 0
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Pxadd = -Pwidth% / Lineheight%
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Pyadd = 0
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End If
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If Pside = 2 Then
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Px = Pwidth%
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Py = Pheight%
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Pxadd = 0
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Pyadd = -Pheight% / Lineheight%
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End If
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If Pside = 3 Then
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Px = 0
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Py = Pheight%
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Pxadd = Pwidth% / Lineheight%
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Pyadd = 0
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End If
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If Pside = 4 Then
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Px = 0
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Py = 0
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Pxadd = 0
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Pyadd = Pheight% / Lineheight%
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End If
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x = X1% Shl 16
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For y% = 0 To Lineheight%
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Ytopy%=Ytop%+y%
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If Ytopy%<0 Then Ytopy%=0
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Lefttable(Ytopy%, 0) = x Sar 16 ;polygon x
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Lefttable(Ytopy%, 1) = Px ;picture x
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Lefttable(Ytopy%, 2) = Py ;picture y
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x = x + Xadd ;Next polygon x
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Px = Px + Pxadd ;Next picture x
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Py = Py + Pyadd ;Next picture y
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Next
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End Function
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Function ScanRightSide (X1%, X2%, Ytop%, Lineheight%, Pside)
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Lineheight% = Lineheight% + 1 ; No divide by zero
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Xadd = (X2% - X1%) Shl 16
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Xadd = Xadd / Lineheight%
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If Pside = 1 Then
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Px = 0
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Py = 0
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Pxadd = Pwidth% / Lineheight%
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Pyadd = 0
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End If
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If Pside = 2 Then
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Px = Pwidth%
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Py = 0
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Pxadd = 0
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Pyadd = Pheight% / Lineheight%
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End If
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If Pside = 3 Then
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Px = Pwidth%
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Py = Pheight%
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Pxadd = -Pwidth% / Lineheight%
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Pyadd = 0
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End If
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If Pside = 4 Then
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Px = 0
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Py = Pheight%
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Pxadd = 0
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Pyadd = -Pheight% / Lineheight%
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End If
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x = X1% Shl 16
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For y% = 0 To Lineheight%
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Ytopy%=Ytop%+y%
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If Ytopy%<0 Then Ytopy%=0
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Righttable(Ytopy%, 0) = x Sar 16 ;polygon x
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Righttable(Ytopy%, 1) = Px ;picture x
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Righttable(Ytopy%, 2) = Py ;picture y
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x = x + Xadd ;Next polygon x
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Px = Px + Pxadd ;Next picture x
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Py = Py + Pyadd ;Next picture y
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Next
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End Function
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Function TextureMap()
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For y% = Miny% To Maxy%
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If y>0 And y<=239
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Polyx1% = Lefttable((y%), 0)
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Px1 = Lefttable(y%, 1)
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Py1 = Lefttable(y%, 2)
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Polyx2% = Righttable((y%), 0)
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Px2 = Righttable(y%, 1)
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Py2 = Righttable(y%, 2)
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Linewidth% = Polyx2% - Polyx1%
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Linewidth%=Linewidth% Or 1
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Pxadd = ((Px2 - Px1)) / Linewidth%
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Pyadd = ((Py2 - Py1)) / Linewidth%
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For x% = Polyx1% To Polyx2%
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If x>0 And x<=319
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Col%=ReadPixelFast((Px1 Shr 16),(Py1 Shr 16),imgtxt)
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WritePixelFast x%,y%,Col%
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EndIf
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Px1 = Px1 + Pxadd
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Py1 = Py1 + Pyadd
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Next
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EndIf
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Next
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End Function
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.building
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Data 23 ; number of pts -1
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; x y z
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Data -100,-100,-100
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Data -100,100,-100
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Data -100,100,100
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Data -100,-100,100
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Data -100,-100,-100
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Data -100,-100,100
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Data 100,-100, 100
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Data 100,-100, -100
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Data -100,100,-100
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Data 100,100,-100
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Data 100,100, 100
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Data -100,100, 100
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Data 100,-100,-100
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Data 100,-100,100
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Data 100,100,100
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Data 100,100,-100
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Data -100,100,100
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Data 100,100,100
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Data 100,-100,100
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Data -100,-100,100
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Data -100,100,-100
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Data -100,-100,-100
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Data 100,-100,-100
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Data 100,100,-100 |