forums.ps2dev.org Forum Index forums.ps2dev.org
Homebrew PS2, PSP & PS3 Development Discussions
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Help with blit and screen

 
Post new topic   Reply to topic    forums.ps2dev.org Forum Index -> PSP Lua Player Development
View previous topic :: View next topic  
Author Message
Ferrero



Joined: 19 Dec 2005
Posts: 15
PostPosted: Mon Dec 19, 2005 7:32 pm    Post subject: Help with blit and screen Reply with quote
Hello everybody,

I'm trying to make a class that manage sprites.
All is going well, but I've a little problem :

I'm trying to save the content of a screen portion before drawing a sprite to avoid re-drawing all the background at every frames.

But when I use screen_save.blit (...., screen, ....) LUAPlayer says that it want an image and not a table for the argument.

Has the screen have an image property, or is there a special instruction to blit the screen to an image ?

Thanks
Back to top
View user's profile Send private message Visit poster's website
Shine



Joined: 03 Dec 2004
Posts: 728
Location: Germany
PostPosted: Tue Dec 20, 2005 7:50 am    Post subject: Re: Help with blit and screen Reply with quote
The screen object should work like an image object. If not, please add a note to the bugs page, with an example how I can reproduce the bug, maybe I or someone else can fix it. But first try screen_save:blit instead of screen_save.blit please :-)
Back to top
View user's profile Send private message
Ferrero



Joined: 19 Dec 2005
Posts: 15
PostPosted: Tue Dec 20, 2005 6:13 pm    Post subject: Reply with quote
OK I'll post a reply with a sample and and this to the bug list.
I must say, that issue is under LuaPlayer for windows. I can't test on a psp because I haven't got one for the moment.
Back to top
View user's profile Send private message Visit poster's website
Ferrero



Joined: 19 Dec 2005
Posts: 15
PostPosted: Wed Dec 21, 2005 2:12 am    Post subject: Reply with quote
Here's the SpriteManagerClass :

Code:
clsSpriteManager = {
   tileWidth   = 0,
   tileHeight   = 0,
   nbTilesOnRow   = 0,
   nbTilesOnCol   = 0,
   image      = nil,
   background   = nil,
   timer      = Timer.new()
}

function clsSpriteManager:new()
   
   mtbSpriteManager = {}
   setmetatable(mtbSpriteManager, self)
   self.background = Image.createEmpty(480, 272)
   self.__index = self
   return mtbSpriteManager

end

function clsSpriteManager:load(filename, width, height)

   self.image=Image.load(filename)
   self.tileWidth  = width   
      self.tileHeight = height
      self.nbTilesOnRow = self.image:width() / width
      self.nbTilesOnCol = self.image:height() / height
      self.timer:start()
         
end

function clsSpriteManager:getTile(tile)

   local x = math.mod(tile, self.nbTilesOnRow) * self.tileWidth
   local y = math.floor(tile / self.nbTilesOnCol) * self.tileHeight
   
   return x,y

end


Here's the sprite class :

Code:

-------------------------------------
-- SPRITE OBJECT
-------------------------------------

clsSprite = {
   x      = 0,
   y      = 0,
   index      = 0,
   oldx      = 0,
   oldy      = 0,
   savx      = 0,
   savy      = 0,
   trgx      = 0,
   trgy      = 0,
   isMoving   = false,
   movingStartTime   = 0,
   movingTime   = 0,
   manager      = nil
}

function clsSprite:new(SpriteManager)
   mtbSprite = {}
   setmetatable(mtbSprite, self)
   self.manager = SpriteManager
   self.__index = self
   return mtbSprite
end

function clsSprite:moveTo(newX, newY, time)
   
   local startTime = self.manager.timer:time()   
   
   self.trgx       = newX
   self.trgy       = newY
   self.oldx      = self.x
   self.oldy      = self.y
   self.isMoving    = true
   self.movingStartTime   = startTime
   self.movingTime   = time
   
end

function clsSprite:saveBackground()
   
   screen:blit(self.savx,self.savy,self.manager.background,0,0,480,272,false)
   
   self.savx = self.x
      self.savy = self.y
   
   self.manager.background:blit(self.x,self.y,screen,self.x,self.y,self.manager.tileWidth,self.manager.tileHeight,true)  -- HERE IS THE PROBLEM --

end

function clsSprite:Draw()
   
   local currentTime = self.manager.timer:time()   
   
   self:saveBackground()
   
   if currentTime >= self.movingStartTime + self.movingTime then
      
      self.x = self.trgx
      self.y = self.trgy
      self.isMoving = false
      
   end
   
   if self.isMoving then
   
      self.x = self.oldx + (self.trgx - self.oldx) * ((currentTime - self.movingStartTime) / self.movingTime)
      self.y = self.oldy + (self.trgy - self.oldy) * ((currentTime - self.movingStartTime) / self.movingTime)
      
   end
   
   local sourcex, sourcey = self.manager:getTile(self.index)
   print(currentTime, self.x, self.y) 
   screen:blit(self.x, self.y, self.manager.image, sourcex, sourcey, self.manager.tileWidth, self.manager.tileHeight, true)
      
end


Here's the Main Code :

Code:
require("SpriteManager.lua")
require("Sprite.lua")

sprManager = clsSpriteManager:new()
sprManager:load("Tiles.png",20,20)

spr = clsSprite:new(sprManager)

-- wait forevever
spr:moveTo(200,200,1000)

while spr.isMoving do
   
   spr:Draw()
   screen.waitVblankStart()
   screen.flip()
   
end


The problem is in the method saveBackground(), the instruction self.manager.background:blit(self.x,self.y,screen,self.x,self.y,self.manager.tileWidth,self.manager.tileHeight,true) cause the problem
Quote:
error: Sprite.lua:51: bad argument #2 to `blit' (Image expected, got table)


Screen doesn't seems to be an image.

Is is possible to acces to the screen Image or the Backbuffer Image ?

PS : I must say that I use LuaPlayer for Windows.
Back to top
View user's profile Send private message Visit poster's website
romero126



Joined: 24 Dec 2005
Posts: 200
PostPosted: Sat Dec 24, 2005 4:42 pm    Post subject: Reply with quote
I would personally use a custom image and redisplay that every time you want to refresh the table.. It can be done by defining it.

Code:

preimage = Image.createEmpty(screen:width(), screen:height())

That way you use a preimage and draw that every time instead of screen..
Unfortunatly that would be the only way of preventing drawing everything all over again.
Plus if you blit it to the "screen" then you can check the screen instead of preimage.

I just thought id throw that out there.
Back to top
View user's profile Send private message
youresam



Joined: 06 Nov 2005
Posts: 87
PostPosted: Sat Dec 24, 2005 11:55 pm    Post subject: I think I know your problem.... Reply with quote
You are telling it a table, but not which part of it.
for example,

to blit self.x, lets say:
self.x = {0}
Now, to blit it, you need to tell it what number out of self.x.
screen_save:blit(self.x[1],self.y[1],...)
That tells it the first digit in self.x and self.y instead of just telling it to use the table.
Back to top
View user's profile Send private message AIM Address
romero126



Joined: 24 Dec 2005
Posts: 200
PostPosted: Tue Dec 27, 2005 7:21 pm    Post subject: Reply with quote
youresam wrote:
You are telling it a table, but not which part of it.
for example,

to blit self.x, lets say:
self.x = {0}
Now, to blit it, you need to tell it what number out of self.x.
screen_save:blit(self.x[1],self.y[1],...)
That tells it the first digit in self.x and self.y instead of just telling it to use the table.


Self.x is a variable not a table.

screen is a table. Unfortunatly there is no way arround defining that as anything more than a table with a write function.
So what I would suggest is looking at writing a prebuffer code to allow you to make your drawing of sprites faster. Unfortunatly there is no current work arround other than that.

PS I ran into a similar problem with code I created as well. So I know first hand.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    forums.ps2dev.org Forum Index -> PSP Lua Player Development All times are GMT + 10 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group