Rendertargets getting cut off when drawn to screen and screen height is below 1024

[ZH-Hristov]

Tested with this code:

--@client
local HUDRT = render.createRenderTarget("HUDRT")
local w, h = render.getResolution()
local clr = Color(255, 0, 0)
local clearclr = Color(0, 0, 0, 0)
enableHud(player(), true)
hook.add("drawhud", "HUD", function()
 render.selectRenderTarget("HUDRT")
 render.clear(clearclr)
 render.setColor(clr)
 render.drawRect(1024 * 0.5 - 25, 0, 50, 1024) -- this should reach the bottom of the screen
 render.selectRenderTarget()
 
 render.setRenderTargetTexture("HUDRT")
 render.drawTexturedRect(w * 0.5 - (h * 0.5), 0, h, h)
end)

Creates a centered RT and tries to draw a red rectangle from the top to the bottom of the screen.
For example: The rectangle will be properly fully drawn at 1080p, but will be cut off about 3/4 of the way down at 720p.


This could be a GMod issue for all I know, so its place might not be here.

[thegrb93]

I think the drawHud hook clips rendering within the screen resolution. Maybe just need to put a DisableClipping call in it.

[adamnejm]

If disabling the clipping won't work, maybe using RT_SIZE_LITERAL could.

[thegrb93]

that function is for 3d clip planes. it won't do it

[thegrb93]

I tried this

-- TEXTUREFLAGS_PROCEDURAL + TEXTUREFLAGS_EIGHTBITALPHA + TEXTUREFLAGS_RENDERTARGET + TEXTUREFLAGS_DEPTHRENDERTARGET
return GetRenderTargetEx("Starfall_CustomRT_" .. i, 1024, 1024, RT_SIZE_LITERAL, MATERIAL_RT_DEPTH_SEPARATE, bit.bor(2048, 8192, 32768, 65536), 0, 0 )

I'm pretty sure I tried it before too and it didn't work. Not sure it can be fixed

[thegrb93]

The selectRenderTarget function does use cam.start2d

[thegrb93]

I'll try in a bit

[thegrb93]

@ZH-Hristov It's because of the HUDPaint hook. If you do this code, then you see the same clipping starfall has.

local exampleRT = GetRenderTarget( "example_rt", 1024, 1024 )

local customMaterial = CreateMaterial( "example_rt_mat", "UnlitGeneric", {
	["$basetexture"] = exampleRT:GetName(), -- You can use "example_rt" as well
	["$translucent"] = 1,
	["$vertexcolor"] = 1
} )

hook.Add( "HUDPaint", "ExampleDraw", function()
	render.PushRenderTarget( exampleRT )
		cam.Start2D()
			render.Clear(0, 0, 0, 0)
			surface.SetDrawColor( 255, 0, 0, 255 )
			surface.DrawRect( 1024 * 0.5 - 25, 0, 50, 1024 )
		cam.End2D()
	render.PopRenderTarget()

	surface.SetDrawColor( 255, 255, 255, 255 )
	surface.SetMaterial( customMaterial )
	surface.DrawTexturedRect( ScrW() * 0.5 - (ScrH() * 0.5), 0, ScrH(), ScrH() )
end )

[thegrb93]

Seems most gmod render hooks suffer from this. I tried a few of them in starfall

--@name Untitled
--@author Sparky
--@client

enableHud(nil, true)

render.createRenderTarget("hi")
hook.add("predrawtranslucentrenderables","",function()
    render.selectRenderTarget("hi")
    render.clear()
    render.setColor(Color(255,0,0))
    render.drawRect(0,0,1024,1024)
    render.selectRenderTarget()

    render.pushViewMatrix({type="2D"})

    render.setColor(Color(255,255,255))
    render.setRenderTargetTexture("hi")
    render.drawTexturedRect(100,200,200,200)

    render.popViewMatrix()
end)

[thegrb93]

Idk if its an alias. You should try adding it

[thegrb93]

I'll check it out again

[thegrb93]

@ZH-Hristov Ok I got it working with render.drawRectFast

--@name Untitled
--@author Sparky
--@client

enableHud(nil, true)

render.createRenderTarget("hi")
hook.add("drawhud","",function()
    render.selectRenderTarget("hi")
    render.clear()
    render.setColor(Color(255,0,0))
    render.drawRectFast(0,0,1024,1024)
    render.selectRenderTarget()

    render.pushViewMatrix({type="2D"})

    render.setColor(Color(255,255,255))
    render.setRenderTargetTexture("hi")
    render.drawTexturedRect(100,200,200,200)

    render.popViewMatrix()
end)

It looks like the 3D rendering functions in the 2D context, such as render.DrawQuad suffers from clipping still, but surface render functions don't.