PlayBasic V1.64M (Work In Progress) Gallery

kevin · October 25, 2010, 02:25:31 PM

PlayBASIC V1.64M Beta #27 - Quad Hit Map Pixels Collision

Another day and another feature collision featured ticked off the To do list. Yesterday I was getting the vector version of this command running, now we have the pixel version running. The vector versions of collision commands detect a collision with the mathematical region that shape in question represents. The pixel versions that this further and attempt a pixel to pixel level impact. Where and when you'd use them largely depends upon what you're trying to do.

Here's the test code bellow

PlayBASIC Code: [Select]

 Dim Vertx#(4)
 Dim VertY#(4)


  BackdropColour=$ff0000

 screen=newfximage(6400,6400)
 rendertoimage screen
 cls  BackdropColour
 circlec 800,400,400,true,$8f8f8f
 circlec 1700,400,400,true,$0f8faf

 for lp=0 to 150
       ellipsec rnd(2400),rnd(800),rndrange(50,150),rndrange(10,50),true, BackdropColour
 next

 BlockWidth   =64
 BlockHeight=64

 Map=Newmap(50)
 createmapgfx  Map,BlockWidth,BlockHeight,4096,BackdropColour,2; CREATE 4096 FX BLOCKS

 Level=NewLevel(Map,GetSurfaceWidth()/BlockWidth,GetSurfaceHeight()/BlockHeight)
 leveltransparent Map,Level,0

   GetMapBlk Map,0,0,0
   Tile=1 
   
   For ylp=0 to GetLevelHeight(map,level)-1
      Ypos=ylp*BlockHeight
      if Ypos+BlockHeight<=GetSurfaceHeight()
          For xlp=0 to GetLevelWidth(map,level)-1
             Xpos=xlp*BlockWidth
             ink $ffff00ff
;             text Xpos,ypos,Tile
             ink $ffffffff
            GetMapBlk Map,Tile,Xpos,ypos
;            text Xpos,ypos,GetMapBlockTransparent(Map,Tile)
;            GetMapBlk Map,Tile,Xpos,ypos
            if GetMapBlockTransparent(Map,Tile)>-1
               PokeLevelTile Map,Level,xlp,ylp,tile
                tile++   
            else
               PokeLevelTile Map,Level,xlp,ylp,0
            endif

            if Tile=>GetMapBlocks(Map) then exitfor ylp
          next 
      endif
   next 


   Screen=NEwfxIMage(800,600)

   rendertoimage Screen
   
   cam=newcamera()
   cameracls cam,off

   c1=rndrgb()
   c2=rndrgb()




   BackDrop=NEwfxIMage(800,600)
   rendertoimage Backdrop   
      shadebox 0,0,getsurfacewidth(),GetsurfaceHeight(),c1,c1,c2,c2
   rendertoscreen   

   RadiusX=100
   RadiusY=200


   Do
   
   setcursor 0,0
      MouseWorldXpos=MouseX()-1+GetCameraX(Cam)       
      MouseWorldYpos=MouseY()-1+GetCameraY(Cam)      

      capturetoscene   
      clsscene   

      capturedepth 200
      drawimage BackDrop,GetCameraX(Cam),GetCameraY(Cam),false

      capturedepth 100

      ; draw the map level
      
      drawmap map,Level,0,0
      ; DRaw the the Mouse pointer within the world space
      capturedepth 10

;         t=timer()

         Angle#=wrapangle(Angle#,1)


   capturedepth 1      

   inkmode 1+32

      Count=0
      Height=70
      For ylp=100 to 1000 step 150
         Width=70
         For xlp=00 to 2000 step 150
            Collision=DRawQuad(Map,level,Xlp,ylp,Width,Height,Angle#+width)
            Width+=5
         Count++
      next
         Height+=5
      next         

         te=timer()-t

      Collision=DRawQuad(Map,level,MouseWorldXpos,MouseWorldYpos,RadiusX,RadiusY,Angle#)
      inkmode 1

         if Collision 
            Colour=$ff0000   
            Message$="Hit"
         else
            Colour=$0000ff
            Message$="Missed"
         endif


      ; draw whatever the camera can see
         drawcamera cam
      rendertoscreen

         drawimage screen,0,0,false



         setcursor 0,0         
         ink $ffffffff
         print "Quad Hit Map Pixels"
         Print "testing "+Str$(Count)+" times"
         print Message$
         print te
         
   
         if LeftMouseBUtton()
               RAdiusX+=1

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PlayBASIC V1.64M Beta #27 - Triangle Hit Map Pixels Collision

Quickly tacked in the Triangle versions of the function. Obviously they're really the same routines behind the scenes, we're just piping in 3 verts for a triangle and 4 for a quad. Performance wise it's perhaps a little faster, but that'd be due to the reduction in area the triangles are covering.

PlayBASIC V1.64M Beta #28 - Shape Hit Map Collision

Working on the ShapeHitMap routine, so far it's just started to work. There's a few gremlins though when it's scaled for some odd reason, but that'll have to wait till i've had some sleep.

kevin · October 26, 2010, 04:10:25 PM

PlayBASIC V1.64M Beta #28 - Shape Hit Map Collision

After a little bit of detective work it seems the odd issues with the ShapeHitMap function were caused from bounding radius of the shape. So i've ended up replacing the bulk of that part of the library, which was unexpected, but should be for the better across the board. The shot bellow shows the shape (the donut thing) mapped around a hard region of a block. So it's seems to be working fairly well for the most, but there's a few annoying little overheads when calling it 1000's of times, mostly when there's a near miss. Which In real world situation is pretty unlikely.

kevin · October 28, 2010, 08:40:47 AM

PlayBASIC V1.64M Beta #28 - Shape Hit Map Pixels Collision

This is the Pixel Version of the command, which is currently about 95% up and running, there's a few little oddities left to iron out (namely when the shape is moved to a negative y position it crashes). Shapes unlike the Triangle and Quad polygon routines (which are always convex) are a little more of a hand full in these types of situations. As a shape can not only only represent convex polygons, but they can also be concave and even complex (edges that intersect). So I can't reply upon the same redundancy assumptions, making this one of the more brute force routines when deal with maps.

Anyway, bellow we see the donut shape being compared to the map on pixel and pixel basis.

PlayBASIC Code: [Select]

   ThisShape=NewConvexShape(50,8)
   TempShape=NewConvexShape(100,6)
   MergeShape TempShape,ThisSHape  

  BackdropColour=$ff0000

 screen=newfximage(6400,6400)
 rendertoimage screen
 cls  BackdropColour
 circlec 800,400,400,true,$8f8f8f
 circlec 1700,400,400,true,$0f8faf

 for lp=0 to 250
       ellipsec rnd(2400),rnd(800),rndrange(50,150),rndrange(10,50),true, BackdropColour
 next

 BlockWidth   =48
 BlockHeight=48

 Map=Newmap(50)
 createmapgfx  Map,BlockWidth,BlockHeight,4096,BackdropColour,2; CREATE 4096 FX BLOCKS

 Level=NewLevel(Map,GetSurfaceWidth()/BlockWidth,GetSurfaceHeight()/BlockHeight)
 leveltransparent Map,Level,0

   GetMapBlk Map,0,0,0
   Tile=1 
   
   For ylp=0 to GetLevelHeight(map,level)-1
      Ypos=ylp*BlockHeight
      if Ypos+BlockHeight<=GetSurfaceHeight()
          For xlp=0 to GetLevelWidth(map,level)-1
             Xpos=xlp*BlockWidth
             ink $ffffffff
            GetMapBlk Map,Tile,Xpos,ypos
            if GetMapBlockTransparent(Map,Tile)>-1
               PokeLevelTile Map,Level,xlp,ylp,tile
                tile++   
            else
               PokeLevelTile Map,Level,xlp,ylp,0
            endif

            if Tile=>GetMapBlocks(Map) then exitfor ylp
          next 
      endif
   next 


   Screen=NEwfxIMage(800,600)

   rendertoimage Screen
   
   cam=newcamera()
   cameracls cam,off

   c1=rndrgb()
   c2=rndrgb()




   BackDrop=NEwfxIMage(800,600)
   rendertoimage Backdrop   
      shadebox 0,0,getsurfacewidth(),GetsurfaceHeight(),c1,c1,c2,c2
   rendertoscreen   

   RadiusX=100
   RadiusY=200

   scale#=1

   Do
   
   setcursor 0,0
      MouseWorldXpos=MouseX()-1+GetCameraX(Cam)       
      MouseWorldYpos=MouseY()-1+GetCameraY(Cam)      
;      rendertoimage Screen

      capturetoscene   
      clsscene   

      capturedepth 200
   
      drawimage BackDrop,GetCameraX(Cam),GetCameraY(Cam),false

      capturedepth 100

      ; draw the map level
      
      drawmap map,Level,0,0
      ; DRaw the the Mouse pointer within the world space
      capturedepth 10


         t=timer()


      if midMousebutton()
         Angle#=wrapangle(Angle#,1)
      
      endif
      
      if LeftMousebUtton()
         scale#+=0.001
         if Scale#>3 then Scale#=0.5
      endif   

         RotateShape ThisShape,Angle#,Scale#
         Collision=ShapeHitMapPixels(Map,Level,ThisShape,MouseWorldXpos,MouseWorldYpos)
      
      if Collision
         col=$f06070    
      else
         Col=$5060f0 
      endif      
      inkmode 1+32
         oldcol=getink()
         Ink Col
         drawshape ThisShape,MouseWorldXpos,MouseWorldYpos,2
         ink oldcol
      inkmode 1      
;            next
         te=timer()-t


         if Collision 
            Colour=$ff0000   
            Message$="Hit"
         else
            Colour=$0000ff
            Message$="Missed"
         endif


      ; draw whatever the camera can see
         drawcamera cam
      rendertoscreen

         drawimage screen,0,0,false



         setcursor 0,0         
         ink $ffffffff
         print "Shape Hit Map Pixels"
         Print "testing "+Str$(Count)+" times"
         print Message$

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kevin · October 28, 2010, 09:55:52 AM

PlayBASIC V1.64M Beta #28 - Download

Here's latest build (Beta 28) for your beta testing pleasure.

Edit: Newer beta bellow !

kevin · October 29, 2010, 12:57:04 AM

PlayBASIC V1.64M Beta #29 - Shape Hit Map Pixels Collision(Tweaked)

This has been really bothering me all night, but after much head scratching finally tracked down the cause the negative Y crashes, which turned out be how the shape was being span converted. So that issue has been fixed in today's revision, another thing that's bothering me with the pixel to pixel versions is the amount of overhead.

Some of the overhead was from the debug code drawing the shapes bounding box... erm.. :) - But a bigger problem was the routine had no obvious way of making an early impact detection. So i've split the process up. The separation allows the routines to catch impacts upon solid blocks and exit early. This change enables us to bypass a lot of the brute force work underneath. So overlapping big shapes over a map should generally be much faster.

The logic changes give the ShapeHitMapPixels function a nice little speed boost, bringing it more inline with the Circle/Ellipse & polygon methods. Bellow in this piccy we're comparing 440 odd shapes to the map scene. This time the shapes aren't all sitting on top of each other, so the we're getting a more realistic idea of the performance impact. Previous snippets compare the same shape in the same position to the map. So they're either all missing completely, partly or they're all near miss at pixel level. The latter is the worst case, since to resolve them it requires the routine do a brute force compare with the pixels.

kevin · October 29, 2010, 04:49:23 PM

PlayBASIC V1.64M Beta #29/30 - Sprite Hit Map Pixels Collision(Tweaked)

It's been another long night digging through some of the long lost (and previously opt'd) collision routines, but it's been a worthwhile exercise as now we can perform pixel to pixel level impacts between sprites and the map. Pictured bellow is the first version of the SpriteHitMapPixels function in action. This function will be used when you want to 'compare' the pixels with the map. The SpriteHitMap function will use the Sprites current collision mode. So a sprites that's set to the rotated rectangle, will compare the a rectangle volume rather than the pixel data. If it's set to circle, it'll use the circle volume and so on. If it's set to pixel, then it'll do a Pixel level impact.

Speed wise the routine is only about 50% slower than the straight vector to pixels methods above when doing a 1000 tests. Although it really depends upon the situation. A near miss is the slowest situation. By that I mean, when the routine has to check lots of pixel data that's very close to the sprite, but not actually overlapping it. Accuracy wise there's bound to be some variations between the collision span routines and rendering span routines (they use different accuracy). But that's par for the course I'm afraid.

kevin · November 01, 2010, 01:49:27 PM

PlayBASIC V1.64M Beta #30 - Download

Here's latest build (Beta 30) for your continued beta testing pleasure. This one tweaks the shape hit maps functions and introduces the SpriteHitMapPixels function. Have fun !

old file deleted

kevin · November 04, 2010, 11:17:06 AM

PlayBASIC V1.64M Beta #31 - Sprite Hit Map / Supporting all collision modes

The current task has been getting SpriteHitMap Functions to support various sprite collision modes, which are the Rect, Rotated,Circle,Shape and Pixels. Here we've looking at the a sprite set to shape mode (with a rough shape outline) in both m,odes. The first is detecting if the regions overlap, the second is stepping down to pixels.

The next little challenge will be add support to these routines for video formatted blocks, as currently they only support FX format.

kevin · November 07, 2010, 05:15:48 AM

PlayBASIC V1.64M Beta #32 - Circle/Ellipse/tri and QuadHitMapPixels Support Video Blocks

Yep, you guessed it, now all of the new collision functions include support for video formatted map blocks. The only one's remaining are Shape and Sprite modes.

PlayBASIC Code: [Select]

 Constant VideoBlocks=true


 Dim Vertx#(4)
 Dim VertY#(4)

 BackdropColour=$ff0000

 screen=newfximage(6400,6400)
 rendertoimage screen
 cls  BackdropColour
 circlec 800,400,400,true,$8f8f8f
 circlec 1700,400,400,true,$0f8faf

 for lp=0 to 150
       ellipsec rnd(2400),rnd(800),rndrange(50,150),rndrange(10,50),true, BackdropColour
 next

 BlockWidth   =64
 BlockHeight=64

 Map=Newmap(50)
 BLockType=2
 if VideoBlocks=true then BlockType=1


 createmapgfx  Map,BlockWidth,BlockHeight,4096,BackdropColour,1; CREATE 4096 FX BLOCKS
   

 Level=NewLevel(Map,GetSurfaceWidth()/BlockWidth,GetSurfaceHeight()/BlockHeight)
 leveltransparent Map,Level,0

   GetMapBlk Map,0,0,0
   Tile=1 
   
   For ylp=0 to GetLevelHeight(map,level)-1
      Ypos=ylp*BlockHeight
      if Ypos+BlockHeight<=GetSurfaceHeight()
          For xlp=0 to GetLevelWidth(map,level)-1
             Xpos=xlp*BlockWidth
             ink $ffff00ff
;             text Xpos,ypos,Tile
             ink $ffffffff
            GetMapBlk Map,Tile,Xpos,ypos
;            text Xpos,ypos,GetMapBlockTransparent(Map,Tile)
;            GetMapBlk Map,Tile,Xpos,ypos
            if GetMapBlockTransparent(Map,Tile)>-1
               PokeLevelTile Map,Level,xlp,ylp,tile
                tile++   
            else
               PokeLevelTile Map,Level,xlp,ylp,0
            endif

            if Tile=>GetMapBlocks(Map) then exitfor ylp
          next 
      endif
   next 



   if VideoBlocks=true
      Screen=NEwIMage(800,600)
   else
      Screen=NEwFXIMage(800,600)
   
   endif


   rendertoimage Screen
   
   cam=newcamera()
   cameracls cam,off

   c1=rndrgb()
   c2=rndrgb()


   BackDrop=NEwfxIMage(800,600)
   rendertoimage Backdrop   
      shadebox 0,0,getsurfacewidth(),GetsurfaceHeight(),c1,c1,c2,c2
   rendertoscreen   

   RadiusX=100
   RadiusY=200


   Do
   
   setcursor 0,0
      MouseWorldXpos=MouseX()-1+GetCameraX(Cam)       
      MouseWorldYpos=MouseY()-1+GetCameraY(Cam)      

      capturetoscene   
      clsscene   

      capturedepth 200
      drawimage BackDrop,GetCameraX(Cam),GetCameraY(Cam),false

      capturedepth 100

      ; draw the map level
      
      drawmap map,Level,0,0
      ; DRaw the the Mouse pointer within the world space
      capturedepth 10

;         t=timer()

         Angle#=wrapangle(Angle#,1)


   capturedepth 1      

         inkmode 1+32
         Collision=EllipseHitMapPixels(Map,level,MouseWorldXpos+300,MouseWorldYpos,RadiusX/2,RadiusY/2)

         if Collision 
            Colour=$ff0000   
            Message1$="Hit"
         else
            Colour=$0000ff
            Message1$="Missed"
         endif
      
         EllipseC MouseWorldXpos+300,MouseWorldYpos,RadiusX/2,RadiusY/2,true,colour
         inkmode 1


;   inkmode 1+32

      Count=0
      Height=70
      For ylp=100 to 1000 step 150
         Width=70
         For xlp=00 to 2000 step 150
;            Collision=DRawQuad(Map,level,Xlp,ylp,Width,Height,Angle#+width)
            Width+=5
         Count++
      next
         Height+=5
      next         

         te=timer()-t

         Collision=DRawQuad(Map,level,MouseWorldXpos,MouseWorldYpos,RadiusX,RadiusY,Angle#)
         inkmode 1


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kevin · November 08, 2010, 12:12:02 AM

PlayBASIC V1.64M Beta #33 - Video Block Support For All MapHitPixel functions + Optimizations

Added the final couple of video methods in today, they as expected a pretty slow, but they have to be for completeness. The other thing I've been working on is some optimizations of the built in Level functions. Namely the removal of the some of the memory management wrapping. Which is negligible when doing a small number of level reads or writes, but can really compound itself when put under stress reading lots of lots of tiles.

To demo this, the code bellow creates a 1000*1000 tile level and then both clones the level using the CloneLevel() and manually compares it with tile by tile. The results are pretty interesting. CopyLevel in Beta33 is about 10 times faster than in Beta 30. Moreover the manual compare loop, is about 10% faster. Which will have a flow on effect.

PlayBASIC Code: [Select]

   Map=newmap(32)

   CreateMapGFX map,64,64,5,$000000
   cls 255
   getmapblk  map,0,0,0 
   cls $00ff00
   getmapblk  map,1,0,0 

   
   Width=1000
   Height=1000
   Level1=newlevel(Map,Width,Height)
   Level2=newlevel(Map,Width*2,Height)

   For Ylp=0 to height-1
      For Xlp=0 to Width-1
         PokeLEvelTile Map,Level1,xlp,ylp,rnd(2)
      next
   next   

   Do

      Cls 0
      
      Frames++
      
      if SpaceKey()=false
         drawmap Map,Level1,0,0
         print "Normal Version"
      else
         drawmap Map,Level2,0,0
         print "Cloned Version"
      endif

      
      t=timer()
      CloneLevel Map,Level1,Map,level2
      tt1#+=timer()-t      
      print "Average Clone Speed:"+str$(tt1#/frames)



      t=timer()
      CompareLevel(Map,Level1,Level2)   
      tt2#+=timer()-t      

      print "Average Manual Compare Speed:"+str$(tt2#/frames)
         
      Sync
   loop



Function CompareLevel(Map,Level1,Level2)

   width      =GetLevelWidth(Map,Level1)
   Height   =GetLevelHeight(Map,Level1)

   For ylp=0 to height   
      For Xlp=0 to Width
         Tile1=PeekLevelTile(Map,Level1,xlp,ylp)
         Tile2=PeekLevelTile(Map,Level2,xlp,ylp)
         if Tile1<>Tile2
               err=1   
               #print "different"
         endif
      next
   next

   if Err
   print "Not the same"
   endif
EndFunction

PlayBASIC V1.64M Beta #33 - Download

old file removed

kevin · November 10, 2010, 10:21:01 PM

PlayBASIC V1.64M Beta #34 - RectOccludeMap - Manual Occlusion

Occlusion support is one of things I've been wanted to implement for some time, but there's always the little stumbling block of just how. For those not familiar, occlusion is a series of conceptual techniques (often customized to the problem) that are used to remove redundant drawing operations from the screen refresh. The idea being to preemptively prohibit the graphics engine from drawing images that's won't actually be visible to the player, due to being behind something else, so why draw them.

A common situation occurs when drawing a multiple map layers over each other. If we imagine a scene with 2 or more layers, then normally we'd draw them all over each other regardless of what was in screen. So with 3 layers, we're potentially draw every pixel 3 times. With modern hardware this is not really that big of a deal (assuming a medium screen resolution), but if you want your games to run on more than just modern windows boxes, then it's worth seeing if we can cull out any of the redunant rendering. This will help speed up the layer rendering, which could potentially boost you games performance not only on the older machines but newer ones too. Which means you'll be able to squeeze more action into the game then without it.

So to help programmers start tackling such problems with maps, i've been implementing a RectOccludeMap function. This function works out what blocks it's covering within the level, then clears them. So when the level is rendered, at section will be blocked out. To demostrate this , i've made a little demo with a backdrop picture and single scrolling in the foreground. The Mouse is moved over the frame and the region it covers is culled from the backdrop.

kevin · November 11, 2010, 07:48:48 AM

PlayBASIC V1.64M Beta #34 - 3 Map Layers With Occlusion

The following pic's and code are an extension of the previous two layer demo. Except this time, we've added a third layer and some occlusion zones to help masking out the middle background layer. To build the layers, I've simply drawing a large picture then cut them up into tiles in code. The middle layer is some random tube things and front layer is of some bricks with a sine wave cut out of it. Neither are optimization into the most minimal block set, but will do for the sake of an example.

Without occlusion the demo runs nicely around the 250-270 fps make. It varies as the on screen pixel count varies frame to frame. With occlusion the rate sit around the 310-330 fps. Which in this demo, is about the speed of rendering the two back layers without occlusion. So we're virtually getting the third layer for free.

Requires PlayBasic V1.64 Beta 34!

PlayBASIC Code: [Select]

      file$="_INSERT_NAME_OF_BACKDROP_PICTURE_HERE"

      print "Loading Backdrop"
      Sync      
      Backdrop2=LoadNewfxImage(File$)
      scaleimage Backdrop2,GEtImageWidth(Backdrop2),600,1+2      
      Backdrop=NewImage(GEtImageWidth(Backdrop2),600)
      CopyRect Backdrop2,0,0,GEtImageWidth(Backdrop2),600,Backdrop,0,0
      deleteimage backdrop2      

      Constant Projection=400

      SceneWidth   =GetSCreenWidth()*2
      SceneHeight   =GetScreenHeight()*2
   
      Screen=NewFXIMage(SceneWidth,SceneHeight)

      print "Building Tube"
      Sync      

      rendertoimage Screen
      For Z= 3000 to 200 step -50
         width=rndrange(150,250)
         width2=width/2
         x=rndrange(width2,SceneWidth-width2)   
         y=100+rnd(SceneHeight/2)
         ThisRGB=RndRGB()
         DrawTube(x,y,500+z,width,900,ThisRGB)
      next

      rendertoscreen
      print "Building TubeMap"
      Sync      

      TubeMap=MakeMapFromIMage(Screen,24,24)



      rendertoscreen
      print "Building WaveMap"
      Sync      


      File$="D:\Source_Codes\GFX\Textures\Brick.bmp"
      BrickImage=LoadNewImage(File$)
      ScaleImage BrickIMage,32,32,1+2


      RendertoIMage Screen
      Cls 0
      TileImage BrickImage,0,0,true

      ;
      Angle#=0
      AngleStep#=720.0/GetImageWidth(Screen) 
      For xlp=0 to GetImageWidth(Screen) 
            y=420+sin(Angle#)*100
            linec xlp,y,xlp,0,0
            Angle#+=AngleStep#
      next


      Type TRects
         x1,y1,x2,y2   
      EndType

      Dim GroundZones as tRects list

      AddRect(0,520,GetImageWidth(Screen) ,800)

      AddRect(500,350,700 ,520)
      AddRect(430,400,770 ,580)

      offset=800
      AddRect(offset+500,350,offset+700 ,520)
      AddRect(offset+430,400,offset+770 ,580)



      BrickWallMap=MakeMapFromIMage(Screen,32,32)


      rendertoscreen
      Cam=NewCamera()
      cameracls cam,off


      StartTime=Timer()

      Do
         

         CurrentTime=Timer()
         TimePast=CurrentTime-StartTime

         CaptureToScene
         ClsScene

         iw=GetIMageWidth(Backdrop)
         ScrollSpeed# = Float(iw)/80000
         Xpos=TimePast*ScrollSpeed#

         capturedepth 100
         DrawImage Backdrop,-xpos,0,false
         DrawImage Backdrop,(-xpos)+iw,0,false
         
         ; Scroll speed in pixels per tick
         ScrollSpeed# = Float(SceneWidth)/20000
         Xpos=TimePast*ScrollSpeed#
         LevelWidth=GetLevelabsWidth(Tubemap,1)-GetMapBlockWidth(TubeMap)
         Layer2_Xpos=MOd(Xpos,LevelWidth/2)

         MouseWorldXpos=MouseX()+GetCameraX(Cam)
         MouseWorldYpos=MouseY()+GetCameraY(Cam)

         CloneLevel TubeMap,1,TubeMap,2

         capturedepth 50
      
         DrawMap TubeMap,2,-Layer2_Xpos,0 



         ; Scroll speed in pixels per tick
         ScrollSpeed# = Float(SceneWidth)/10000
         Xpos=TimePast*ScrollSpeed#
         LevelWidth=GetLevelabsWidth(BrickWallMap,2)-GetMapBlockWidth(BrickWallMap)
         Layer3_Xpos=MOd(Xpos,LevelWidth/2)

         capturedepth 10

         if spacekey()=false
               DrawMap BrickWallMap,2,-Layer3_Xpos,0 
         endif

         capturedepth 1

         for each GroundZones()
               
            x1=GroundZones.x1   -Layer3_Xpos
            x2=GroundZones.x2   -Layer3_Xpos
            y1=GroundZones.y1
            y2=GroundZones.y2
            boxc x1,y1,x2,y2,false,$00ff0000         

            MapSpaceX1=x1+Layer2_Xpos      
            MapSpaceY1=y1      
            MapSpaceX2=x2+Layer2_Xpos      

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kevin · November 12, 2010, 11:01:40 PM

PlayBASIC V1.64M Beta #34 - Download

Posted beta 34, this one has the occlusion commands in it, but only the RectOccludeMap is hooked up.

Get PlayBAsic V1.64 Beta 34 (login required)

kevin · November 15, 2010, 10:58:00 AM

PlayBASIC V1.64M Beta #35 - Quad (Polygon) Occlude Map

Tonight I'm putting the final touches on the occlusion commands, with the addition of the Circle / Ellipse & QuadOccludeMap functions. They work via the same principal as the Rect version, you give it a shape and it cuts that region out of map level. Supporting different zones should make it easier for those creative programmers to tweak their games performance just that little bit more.

Download

deleted

kevin · November 16, 2010, 09:36:53 PM

PlayBASIC V1.64M Beta #36 -Optimization Stage

Been sifting through the Shape Library this afternoon trying to improve the speed of the some core functions like PointHitShape, but without altering it's functionality. So far the results have been fairly pleasing seeing around a 40% gain in performance over a 10000 calls. This caries through to other routines like the LineHitShape and Shape intersections due to their usage of PointHitShape in certain circumstances. Giving a nice little boost to demos that usage a lots of shape collisions.

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