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Twirly special FX demo by big10p
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BlitzBasic 3D
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3D Effects
; ; Twirly Special FX demo by big10p (A.K.A. Chris Chadwick) 2003 ; Graphics3D 800,600,32 SetBuffer BackBuffer() WireFrame 0 AntiAlias 0 SeedRnd MilliSecs() Type twirly_layerT Field ent ; Layer star mesh entity. Field rot# ; Amount to rotate layer each update. Field clut_i% ; Index of layer's CLUT colour. End Type Type twirlyT Field tx#,ty# ; Demo-specific 2D twirly movement amounts. Field piv ; Control pivot - all layers are attached to this. Field hidden% ; Bool flag to indicate if Twirly is hidden. Field layer_bank ; Bank holding Handle() IDs of all layers. Field num_layers% ; Total number of Twirly layers. Field clut% ; clut_banks() index of Twirly's CLUT. Field max_clut_i% ; Bank index of last colour (RGB set) in CLUT. Field clut_cycle% ; CLUT cycle control. - left, 0 no cycle, + right. Field cycle_count% ; Count down to next CLUT cycle. End Type ; Create 2 starfield planes. Global tex1 = CreateTexture(128,128,4) make_tex(tex1) plane1 = CreatePlane() RotateEntity plane1,-90,0,0 PositionEntity plane1,0,0,10 EntityTexture plane1,tex1 Global tex2 = CreateTexture(128,128,4) make_tex(tex2) plane2 = CreatePlane() RotateEntity plane2,-90,0,0 PositionEntity plane2,0,0,11 EntityTexture plane2,tex2 Global frame_count% Global fps% Global slowest_fps% Global fps_timeout% Global frame_time% Global slowest_frame% Global frame_start% fps_timer = CreateTimer(60) slowmo% = False wiref% = False Global cam = CreateCamera() PositionEntity cam,0,0,-20 CameraZoom cam,1.4 light = CreateLight() Const END_OF_CLUT% = -1 Const END_OF_CLUT_LIST% = -2 Const MAX_CLUTS% = 100 Global num_cluts% = 0 Dim clut_banks(MAX_CLUTS-1) open_twirly() copy_clut_grad(1,5) ; Create some twirlies. For n = 1 To 3 tw1.twirlyT = create_preset_twirly(n) PositionEntity tw1\piv,Rnd(-5,5),Rnd(-5,5),-10 Next vp1# = 1 : vp2# = 1 ; --- Main loop --- While Not KeyHit(1) frame_start = MilliSecs() If KeyHit(28) Then slowmo = Not slowmo If KeyHit(14) Then wiref = Not wiref : WireFrame wiref For this.twirlyT = Each twirlyT CameraProject cam,EntityX(this\piv),EntityY(this\piv),EntityZ(this\piv) If ProjectedX() > 800 Or ProjectedX() < 0 Then this\tx=-this\tx If ProjectedY() > 600 Or ProjectedY() < 0 Then this\ty=-this\ty TranslateEntity this\piv,this\tx,this\ty,0 Next vp1 = vp1 - 0.003 vp2 = vp2 - 0.001 PositionTexture tex1,1,vp1 PositionTexture tex2,1,vp2 update_twirly() RenderWorld ;show_info() ;show_clut(10,80) frame_time = MilliSecs() - frame_start WaitTimer(fps_timer) Flip(1) If slowmo Then Delay 200 Wend close_twirly() ClearWorld End ; The Twirly CLUTS, defined in RGB sets. .twirly_clut_data Data 255,0,0 Data 0,255,0 Data 0,0,255 Data END_OF_CLUT Data 255,255,0 Data 0,255,0 Data 0,255,255 Data 0,0,255 Data 255,0,255 Data 255,0,0 Data END_OF_CLUT Data END_OF_CLUT_LIST ; ; Draws random coloured starfield onto text. ; Function make_tex(tex) SetBuffer TextureBuffer(tex) For y = 0 To 127 For x = 0 To 127 WritePixel x,y,$00000000 Next Next Color 255,255,255 For n = 1 To 200 r = Rand(0,255) Shl 16 g = Rand(0,255) Shl 8 b = Rand(0,255) WritePixel Rand(0,127),Rand(0,127),$ff000000 Or (r Or g Or b) Next ScaleTexture tex,30,30 SetBuffer BackBuffer() End Function ; ; Prepares the Twirly system ready for use. ; Function open_twirly() Local r%,g%,b% Local clut_size%[MAX_CLUTS-1] Local cs% = 0 ; Count CLUT entries and size. Restore twirly_clut_data Repeat Read r If r = END_OF_CLUT clut_size[num_cluts] = cs num_cluts = num_cluts + 1 cs = 0 Read r : If r = END_OF_CLUT_LIST Then Exit EndIf Read g Read b cs = cs + 1 Forever ; Create CLUT banks. Restore twirly_clut_data For i = 0 To num_cluts-1 clut_banks(i) = CreateBank((clut_size[i]*3)*4) For n = 0 To BankSize(clut_banks(i))-1 Step 12 Read r,g,b PokeInt clut_banks(i),n,r PokeInt clut_banks(i),n+4,g PokeInt clut_banks(i),n+8,b Next Read dummy ; Skip END_OF_CLUT terminator. Next End Function ; ; Closes down the Twirly system, freeing all resources. ; Function close_twirly() ; Kill all Twirlies. For this.twirlyT = Each twirlyT free_twirly(this) Next ; Free the CLUT banks. For i = 0 To num_cluts-1 FreeBank clut_banks(i) Next End Function ; ; Frees all resources used by a given twirly. ; ; Params: ; twirly - The twirly to be freed. ; Function free_twirly(twirly.twirlyT) ; Free all Twirly layer resources. For n = 0 To BankSize(twirly\layer_bank)-1 Step 4 layer.twirly_layerT = Object.twirly_layerT(PeekInt(twirly\layer_bank,n)) FreeEntity layer\ent Delete layer Next ; Free actual Twirly resources. FreeEntity twirly\piv FreeBank layer_bank Delete twirly End Function ; ; Creates a single layer twirly. See create_star_mesh() for params. ; Function create_twirly.twirlyT(radius#,points%,indent#,ratio%=True) twirly.twirlyT = New twirlyT twirly\piv = CreatePivot() RotateEntity twirly\piv,0,180,0 ; So we can point twirly at camera. twirly\num_layers = 1 twirly\hidden = False twirly\tx = Rnd(.01,.03) : If Rand(0,1) Then twirly\tx = -twirly\tx twirly\ty = Rnd(.01,.03) : If Rand(0,1) Then twirly\ty = -twirly\ty layer.twirly_layerT = New twirly_layerT twirly\layer_bank = CreateBank(4) PokeInt twirly\layer_bank,0,Handle(layer) ; Create initial twirly layer. layer\ent = create_star_mesh(radius,points,indent,ratio) EntityParent layer\ent,twirly\piv PositionEntity layer\ent,0,0,0,0 EntityFX layer\ent,1+4+8 Return twirly End Function ; ; Adds a layer to the specified, existing twirly. ; See create_star_mesh() for other params. ; Function add_twirly_layer(twirly.twirlyT,radius#,points%,indent#,ratio%=True) layer.twirly_layerT = New twirly_layerT bs = BankSize(twirly\layer_bank) ResizeBank twirly\layer_bank,bs+4 PokeInt twirly\layer_bank,bs,Handle(layer) ; Create twirly layer. layer\ent = create_star_mesh(radius,points,indent,ratio) PositionEntity layer\ent,0,0,Float(twirly\num_layers)*0.001 EntityParent layer\ent,twirly\piv,1 twirly\num_layers = twirly\num_layers + 1 EntityFX layer\ent,1+4+8 End Function ; ; Sequentially 'paints' all layers of a twirly with the given CLUT. ; ; Params: ; twirly - Twirly to be coloured with the specified CLUT. ; clut - Number of CLUT to colour twirly with. ; cycle - Specifies how to cycle the CLUT every time the twirly is updated: ; 0 (default) to not cycle the CLUT. ; -1 to cycle the CLUT to the left. ; 1 to cycle the CLUT to the right. ; dir - Direction to colour the twirly layers with: ; 0 (default) to colour layers from first-to-last. ; 1 to colour layers from last-to-first. ; Function set_twirly_clut(twirly.twirlyT,clut%,cycle%=0,dir%=0) clut_i% = 0 clut_size% = BankSize(clut_banks(clut)) cb = clut_banks(clut) If dir = 0 For n = 0 To twirly\num_layers-1 id = PeekInt(twirly\layer_bank,n*4) layer.twirly_layerT = Object.twirly_layerT(id) layer\clut_i = clut_i EntityColor layer\ent,PeekInt(cb,clut_i),PeekInt(cb,clut_i+4),PeekInt(cb,clut_i+8) clut_i = clut_i + 12 If clut_i = clut_size Then clut_i = 0 Next Else For n = twirly\num_layers-1 To 0 Step -1 id = PeekInt(twirly\layer_bank,n*4) layer.twirly_layerT = Object.twirly_layerT(id) layer\clut_i = clut_i EntityColor layer\ent,PeekInt(cb,clut_i),PeekInt(cb,clut_i+4),PeekInt(cb,clut_i+8) clut_i = clut_i + 12 If clut_i = clut_size Then clut_i = 0 Next EndIf twirly\clut = clut twirly\clut_cycle = cycle twirly\cycle_count = Abs(cycle) twirly\max_clut_i = clut_size-12 End Function ; ; Sets all layers of a twirly to use a given blend mode. ; Function set_twirly_blend(twirly.twirlyT,mode%) For n = 0 To BankSize(twirly\layer_bank)-1 Step 4 layer.twirly_layerT = Object.twirly_layerT(PeekInt(twirly\layer_bank,n)) EntityBlend layer\ent,mode Next End Function ; ; Sets all layers of a twirly to use a given alpha level. ; Function set_twirly_alpha(twirly.twirlyT,alpha#) For n = 0 To BankSize(twirly\layer_bank)-1 Step 4 layer.twirly_layerT = Object.twirly_layerT(PeekInt(twirly\layer_bank,n)) EntityAlpha layer\ent,alpha Next End Function ; ; Creates a copy of an existing CLUT with gradients between each colour. ; ; Params: ; clut - Number of CLUT to be copied. ; grads - Number of gradients to insert between each colour. ; grad_r - Each colour from the copied CLUT is faded to this colour. ; grad_g If not specified (default), colours fade to the next colour ; grad_b from the CLUT being copied. ; ; Returns: ; Index of new clut in clut_banks() array. ; Function copy_clut_grad(clut%,grads%,grad_r#=-1,grad_g#=-1,grad_b#=-1) old_clut = clut_banks(clut) old_size = BankSize(clut_banks(clut)) new_clut = CreateBank(old_size*(grads+1)) clut_banks(num_cluts) = new_clut num_cluts = num_cluts + 1 poke_i = 0 If grad_r=-1 Or grads=0 ; Create gradients between adjacent colours from the copied CLUT. grad_div = grads + 1 For i = 0 To old_size-1 Step 12 r1# = Float(PeekInt(old_clut,i)) g1# = Float(PeekInt(old_clut,i+4)) b1# = Float(PeekInt(old_clut,i+8)) ; Get colour to fade to. If i = old_size-12 ; Wraparound to first colour. r2# = Float(PeekInt(old_clut,0)) g2# = Float(PeekInt(old_clut,4)) b2# = Float(PeekInt(old_clut,8)) Else ; Use next colour in CLUT. r2# = Float(PeekInt(old_clut,i+12)) g2# = Float(PeekInt(old_clut,i+12+4)) b2# = Float(PeekInt(old_clut,i+12+8)) EndIf r_step# = (r2-r1)/grad_div g_step# = (g2-g1)/grad_div b_step# = (b2-b1)/grad_div ; Add original colour and gradients to new CLUT. For n = 0 To grads PokeInt new_clut,poke_i, Int(r1 + (n*r_step)) PokeInt new_clut,poke_i+4,Int(g1 + (n*g_step)) PokeInt new_clut,poke_i+8,Int(b1 + (n*b_step)) poke_i = poke_i + 12 Next Next Else ; Create gradients from copied CLUT colour to grad_r,grad_g,grad_b. For i = 0 To old_size-1 Step 12 r1# = Float(PeekInt(old_clut,i)) g1# = Float(PeekInt(old_clut,i+4)) b1# = Float(PeekInt(old_clut,i+8)) r_step# = (grad_r-r1)/grads g_step# = (grad_g-g1)/grads b_step# = (grad_b-b1)/grads ; Add original colour and gradients to new CLUT. For n = 0 To grads PokeInt new_clut,poke_i, Int(r1 + (n*r_step)) PokeInt new_clut,poke_i+4,Int(g1 + (n*g_step)) PokeInt new_clut,poke_i+8,Int(b1 + (n*b_step)) poke_i = poke_i + 12 Next Next EndIf Return num_cluts - 1 End Function ; ; Updates ALL non-hidden Twirlies. ; Function update_twirly() For this.twirlyT = Each twirlyT If Not this\hidden PointEntity this\piv,cam cb = clut_banks(this\clut) ; Twirly's CLUT cycle frequency management. do_cycle = False If this\clut_cycle this\cycle_count = this\cycle_count - 1 If this\cycle_count = 0 this\cycle_count = Abs(this\clut_cycle) do_cycle = True EndIf EndIf If do_cycle ; Update each layer attached to this twirly, cycling the CLUT. For n = 0 To BankSize(this\layer_bank)-1 Step 4 layer.twirly_layerT = Object.twirly_layerT(PeekInt(this\layer_bank,n)) TurnEntity layer\ent,0,0,layer\rot If this\clut_cycle < 0 ; Cycle CLUT to the left. clut_i = layer\clut_i + 12 If clut_i > this\max_clut_i Then clut_i = 0 Else ; Cycle CLUT to the right. clut_i = layer\clut_i - 12 If clut_i < 0 Then clut_i = this\max_clut_i EndIf layer\clut_i = clut_i EntityColor layer\ent,PeekInt(cb,clut_i),PeekInt(cb,clut_i+4),PeekInt(cb,clut_i+8) Next Else ; Update each layer attached to this twirly. For n = 0 To BankSize(this\layer_bank)-1 Step 4 layer.twirly_layerT = Object.twirly_layerT(PeekInt(this\layer_bank,n)) TurnEntity layer\ent,0,0,layer\rot Next EndIf End If Next End Function ; ; Creates a planar, star-shaped mesh. ; ; Params: ; radius - Radius of star in world units. ; points - Number of points the star should have. ; indent - Sets the 'depth' of the indent between the points of the star. ; ratio - True (default) to indicate that indent is a ratio of the radius ; e.g. 1=no indent (circle), .5=indent midway between point and centre. ; False to indicate that indent is an absolute size. ; ; Returns: ; The newly created star mesh. ; Function create_star_mesh(radius#=1.0,points%=5,indent#=0.5,ratio%=True) If ratio Then indent = radius * indent ; Convert indent to ratio of radius. mesh = CreateMesh() surf = CreateSurface(mesh) verts% = points * 2 vang# = 0 vang_step# = 360.0/Float(verts) ; Add verts for all star points & indents. For n = 0 To verts-1 If (n And 1) Then size# = indent Else size# = radius AddVertex(surf,Cos(vang)*size,Sin(vang)*size,0) VertexNormal surf,n,0,0,-1 vang = vang + vang_step Next ; Add centre vert. AddVertex(surf,0,0,0) VertexNormal surf,verts,0,0,-1 ; Make triangles. For n = 0 To verts-2 AddTriangle surf,n,verts,n+1 Next AddTriangle surf,verts-1,verts,0 Return mesh End Function ; ; Creates a twirly_type preset twirly. ; Function create_preset_twirly.twirlyT(twirly_type%) Select twirly_type Case 1 dir#=.01 For n = 1 To 30 If n=1 tw.twirlyT = create_twirly(n*.01,10,.2) Else add_twirly_layer(tw,n*.1,10,.1) EndIf set_layer_rotate(tw,n-1,dir*n) Next set_twirly_clut(tw,2,2,1) set_twirly_blend(tw,3) set_twirly_alpha(tw,.2) Return tw Case 2 dir#=.01 For n = 1 To 30 If n=1 tw.twirlyT = create_twirly(n*.01,5,.2) Else add_twirly_layer(tw,n*.1,10,.3) EndIf set_layer_rotate(tw,n-1,dir*n) dir = -dir Next set_twirly_clut(tw,2,2,1) set_twirly_blend(tw,3) set_twirly_alpha(tw,.2) Return tw Case 3 dir#=.01 For n = 1 To 30 If n=1 tw.twirlyT = create_twirly(n*.01,5,.2) Else add_twirly_layer(tw,n*.1,5,.3) EndIf set_layer_rotate(tw,n-1,dir*n) Next set_twirly_clut(tw,2,2,1) set_twirly_blend(tw,3) set_twirly_alpha(tw,.2) Return tw End Select End Function ; ; Hides a Twirly from view. Ignores if Twirly is already hidden. ; ; Params: ; twirly - The Twirly to hide from view. ; Function hide_twirly(twirly.twirlyT) If twirly\hidden = False HideEntity twirly\piv twirly\hidden = True End If End Function ; ; Makes a hidden Twirly visible. Ignores if Twirly is already visible. ; ; Params: ; twirly - The hidden Twirly to make visible. ; Function show_twirly(twirly.twirlyT) If twirly\hidden = True ShowEntity twirly\piv twirly\hidden = False End If End Function ; ; Sets a given twirly layer to an absolute rotation. ; Function rotate_twirly_layer(twirly.twirlyT,layer%,rot#) star.twirly_layerT = Object.twirly_layerT(PeekInt(twirly\layer_bank,layer*4)) RotateEntity star\ent,0,0,rot,1 End Function ; ; Sets how much a given twirly layer should rotate by every update. ; Function set_layer_rotate(twirly.twirlyT,layer%,rot#) star.twirly_layerT = Object.twirly_layerT(PeekInt(twirly\layer_bank,layer*4)) star\rot = rot End Function ; ; Debug function to visually display CLUT(s). ; ; Params: ; cx - Screen X coord to display CLUT at. ; cy - Screen Y coord to display CLUT at. ; clut - Number of CLUT to display. ; If not specified (default) then all CLUTS are displayed. ; Function show_clut(cx%=0,cy%=0,clut%=-1) Local cxs = cx Local cw = 10 Local ch = 10 Local gap = 0 If clut = -1 first_clut = 0 last_clut = num_cluts - 1 Else first_clut = clut last_clut = clut EndIf For n = first_clut To last_clut clut = clut_banks(n) For j = 0 To BankSize(clut)-1 Step 12 r = PeekInt(clut,j) g = PeekInt(clut,j+4) b = PeekInt(clut,j+8) Color r,g,b Rect cx,cy,cw,ch,1 cx = cx + cw + gap If (cx+cw-1)>=GraphicsWidth() Then cx=cxs:cy=cy+ch+gap Next cx = cxs cy = cy + ch + 4 Next Color 255,255,255 End Function ; ; Display debug info. ; Function show_info() If fps_timeout frame_count = frame_count + 1 If MilliSecs() > fps_timeout Then fps_timeout = MilliSecs() + 1000 fps = frame_count frame_count = 0 If fps < slowest_fps Or slowest_fps = 0 Then slowest_fps = fps EndIf If frame_time > slowest_frame Then slowest_frame = frame_time Color 0,255,0 Text 10,10," Triangles: " + TrisRendered() Color 255,255,0 Text 10,25," Millisecs: " + frame_time Text 10,40," Slowest: " + slowest_frame Color 0,255,255 Text 10,55," FPS: " + fps Text 10,70," Worst: " + slowest_fps Color 255,255,255 Else ; First call initialization. fps_timeout = MilliSecs() + 1000 EndIf End Function
Author Comments:
This was a special FX entity system I was working on about a year ago before I gave up on it after realizing that overlaying lots of blended layers on top of each other wasnt such a great idea (speed wise). Anyway, I guess Twirlies could still be used for certain things, like making a pretty screensaver, or something. Theyre pretty much infinately configurable as each can have its own user defined CLUT which can be cycled etc.
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