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    RTT bug

    RickyngkRickyngk Member
    edited July 2013 in General questions
    I've found a bug while working with RTT
    local rt1 = RenderTarget.new(1024, 768, true)
local texture1 = Texture.new("logo.png")
local bitmap1 = Bitmap.new(texture1)
bitmap1:setPosition(0, 0)
rt1:draw(bitmap1)
local b_rt1 = Bitmap.new(rt1)
stage:addChild(b_rt1)
 
local rt2 = RenderTarget.new(1024, 768, true)
local texture2 = Texture.new("icon.png")
local bitmap2 = Bitmap.new(texture2)
bitmap2:setPosition(bitmap1:getWidth(), 0)
rt2:draw(bitmap2)
local b_rt2 = Bitmap.new(rt2)
stage:addChild(b_rt2)
    It looks ok, and result is att1

    But, if I replace local bitmap2 = Bitmap.new(texture2) by local bitmap2 = Bitmap.new(texture1) (That mean I DO NOT USE texture2 anymore), icon image still be displayed and scaled. (att2)
    local rt1 = RenderTarget.new(1024, 768, true)
local texture1 = Texture.new("logo.png")
local bitmap1 = Bitmap.new(texture1)
bitmap1:setPosition(0, 0)
rt1:draw(bitmap1)
local b_rt1 = Bitmap.new(rt1)
stage:addChild(b_rt1)
 
local rt2 = RenderTarget.new(1024, 768, true)
local texture2 = Texture.new("icon.png")
local bitmap2 = Bitmap.new(texture1)
bitmap2:setPosition(bitmap1:getWidth(), 0)
rt2:draw(bitmap2)
local b_rt2 = Bitmap.new(rt2)
stage:addChild(b_rt2)
    After that, I remove local texture2 = Texture.new("icon.png"):
    local rt1 = RenderTarget.new(1024, 768, true)
local texture1 = Texture.new("logo.png")
local bitmap1 = Bitmap.new(texture1)
bitmap1:setPosition(0, 0)
rt1:draw(bitmap1)
local b_rt1 = Bitmap.new(rt1)
stage:addChild(b_rt1)
 
local rt2 = RenderTarget.new(1024, 768, true)
--local texture2 = Texture.new("icon.png")
--local bitmap2 = Bitmap.new(texture2)
local bitmap2 = Bitmap.new(texture1)
bitmap2:setPosition(bitmap1:getWidth(), 0)
rt2:draw(bitmap2)
local b_rt2 = Bitmap.new(rt2)
stage:addChild(b_rt2)
    Logo is displayed only one times. Nothing inside rt2 (att3)

    It seems that bug will happen if we create/load a texture after calling RenderTarget:draw(). So, we should load & create texture before rendering. The following code works well:
    local texture1 = Texture.new("logo.png")
local texture2 = Texture.new("icon.png")
 
local rt1 = RenderTarget.new(1024, 768, true)
local rt2 = RenderTarget.new(1024, 768, true)
 
local bitmap1 = Bitmap.new(texture1)
bitmap1:setPosition(0, 0)
rt1:draw(bitmap1)
local b_rt1 = Bitmap.new(rt1)
stage:addChild(b_rt1)
 
local bitmap2 = Bitmap.new(texture1)
bitmap2:setPosition(bitmap1:getWidth(), 0)
rt2:draw(bitmap2)
local b_rt2 = Bitmap.new(rt2)
stage:addChild(b_rt2)
    However, It's impossible in real game ;)
    http://www.guava7.com/
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