best way to slide content in renderTarget ?

[Overkillz]

Hello dear community today Im trying to work with renderTargets to make a list with some rows.

However, I want to limit it with the sizeY by screenSizeY *0.5, It is allow me to not to draw all the rows. But I want that if the player press some keys he is allowed to slide it up/down.

Sadly, while sliding it up/down, due to the renderTarget it causes a some draw problems. Just see the images. I tried to create the renderTarget again inside the drawFunction, but I already know that it will cause performance issues. So, thats why Im asking for the best way to fix it

I already tried to use 

dxSetBlendMode("modulate_add")
dxSetBlendMode("blend") 

local sX,sY = guiGetScreenSize()
local sizeX,sizeY,maxSizeY = sX*0.6,sY*0.25,sY*0.95
local font = "default-bold"
local fontHeight = dxGetFontHeight(1,font) + 5

local myRenderTarget = dxCreateRenderTarget(sizeX,maxSizeY) 

local fakePlayersTable = {}
local posY = 0

for i=1,50 do
	table.insert(fakePlayersTable,"FakePlayer_"..i)
end

function drawTest()
	if getKeyState( "lshift" ) == true then
		posY = posY + 3
	elseif getKeyState( "lctrl" ) == true then
		posY = posY - 3
	end
	dxSetRenderTarget( myRenderTarget ) 
	local n = 0
	for id,player in ipairs(fakePlayersTable) do
		dxDrawText(player,0,posY + fontHeight*(n) )
		n = n + 1
	end
	dxSetRenderTarget() 
	dxDrawImage( sX/2-sizeX/2,  sY/2 - maxSizeY / 2,  sizeX, maxSizeY, myRenderTarget )
end
addEventHandler("onClientRender",root,drawTest)

Thanks for reading, bets regards.

[IIYAMA]

@Overkillz

dxSetRenderTarget( myRenderTarget, true ) 

Syntax:

bool dxSetRenderTarget ( [ element renderTarget, bool clear = false ] )

 

The stuff you have drawn before on the paper, will not just clear itself. A render target is like a piece of paper of the REAL WORLD. Once you have drawn on it, you need an eraser to clean it.

 

---

 

There are two things you can do.

• Clear the render target
• Or paint it black again with a rectangle.

 

If it is just text on it, clearing the render target will do the job. But if you have multiple components on it, which you do not want to re-draw very frame on the render-target, then it might be handy to paint selected area's black.

 

See also blend mode:

overwrite : The source textures are overwritten. This can be useful for clearing render targets

https://wiki.multitheftauto.com/wiki/DxSetBlendMode

(Haven't used it before.)

 

---

 

Also keep in minder that you can also use two render targets. One you can update when the text changes and one to move the frame.