Alter a HUD drawn texture's colour/saturation/etc.

[DyaMetR]

I give up.

I've been quite some hours investigating the render library and I've been unable to understand all functions and achieve what I was looking for.

I want to generate a texture that contains the icon from the weapon selector of a specific weapon. It has two main textures: A background, and on top, the texture resulting of WEAPON.WepSelectIcon (which returns an ID).

Right now I've got something like this:

https://files.facepunch.com/forum/upload/113353/34a97a6f-8152-440b-993e-894150643f98/scn1.png

And I would like to alter the rendering of the weapon image so it looks something like this:

https://files.facepunch.com/forum/upload/113353/d3956b82-4e0b-4ed4-a600-7f599bb8c986/scn2.png

(inb4 shitty photoshopping)
Only altering saturation would be enough, so the colouring could be more effective.

Any ideas?

Thanks in advance.

[MPan1 banned]

This would be possible through the use of stencils. I'm not good with stencils though, I still find them confusing although I've used them before.
I'm sure somebody on this forum will know what to do in this case.

[DyaMetR]

Thanks for the answer, at least I know something more that before!

[MPan1 banned]

Actually, I forgot Blue made a really great library that you could probably use for this:
Blue's Masks and Shadows!

[WasabiThumbs]

Or, you can just change the textures in a DModelPanel. This should work, I guess.
local panel = vgui.Create("DModelPanel")
panel:SetPos( 0, 0 ) -- Set this to the position of it or something
panel:SetSize( 200, 200 )
panel:SetModel("blah/blah/model.mdl") -- set this to the model
panel:RequestFocus() -- something along these lines, tbh cant remember
function panel:PreDrawModel(ent)
ent:SetMaterial("gui/someorangething") -- get an orange texture, or something
end

[DyaMetR]

I might aswell check out that tomorrow and see if I can make it work with it. It looks like what I might need but I have to take a deeper look at it.

[WasabiThumbs]

I mean, if my idea works then using Blue's Masks would be a bit of a waste...
(notice me)

[MPan1 banned]

I was assuming the model he was showing wasn't a DModelPanel, but a static image. If it's a model it's way easier.

[WasabiThumbs]

OP says...
I've invested quite some hours investigating the render library and I've been unable to understand all functions and achieve what I was looking for.
... so I can only presume either he has something that barely works or is using a png.

[MPan1 banned]

yes you are correct so we must wait for his response

[DyaMetR]

As I said on the initial post, I'm using the icon of the swep SWEP.WepSelectIcon, so it's a texture (vtf). Using a DModelPanel would be a hassle because every weapon model has a size and origin and I'm trying to create a system as universal as possible (for the default weapons I'll have to write a text, and for those using a custom function I call it on the same place that I'd draw the image).

[MPan1 banned]

In that case, try using Blue's Masks and Shadows!
I'll make an example maybe later

[DyaMetR]

That looks sick. I'll see if I can use it (I don't have the absolute path, only the texture ID though, I don't know if I'll be able to use it with only that).

[MrManiak]

local gray = CreateMaterial("color_gray","UnlitGeneric",Material("color"):GetKeyValues())
gray:SetVector( "$color", Vector(0.5,0.5,0.5) )

function self.Icon:DrawModel( ent )
render.ClearStencil() 
render.SetStencilEnable(true)
render.SetStencilTestMask(255)
render.SetStencilWriteMask(255)
render.SetStencilReferenceValue(1) 
render.SetStencilPassOperation( STENCILOPERATION_REPLACE ) 
render.SetStencilFailOperation( STENCILOPERATION_ZERO ) 
render.SetStencilZFailOperation( STENCILOPERATION_ZERO ) 
render.SetStencilCompareFunction( STENCILCOMPARISONFUNCTION_ALWAYS )
render.SetBlend(0)
self:GetEntity():DrawModel()
render.SetBlend(1)
render.SetStencilCompareFunction(STENCILCOMPARISONFUNCTION_EQUAL)
render.SetMaterial(gray)
render.DrawScreenQuad()
render.SetStencilEnable(false) 
return 
end
I used this code to make the model in a DModel be gray. This code works but is most likely trash, be careful.

https://files.facepunch.com/forum/upload/114817/03c6b641-aeb1-49f9-9b10-e30137b5a29b/image.png

[DyaMetR]

https://files.facepunch.com/forum/upload/113353/6260e5c5-13c9-47ce-9044-dd0cc1322dae/scn4.png

This is the result, and I kinda expected it.

I don't know if by tweaking your code I could get a result, but I think this is happening because your method is only effective in a 3D context, where the shape is decided by the model itself, and you're just changing its material and color.

[MPan1 banned]

If it has a texture ID it should also have an absolute path. You usually need to use surface.GetTextureID to even get the ID for the texture, and that function requires a path. I'm not sure how you even create an ITexture on it's own but I'm sure there's a path somewhere

[DyaMetR]

I don't have access to the absolute path since I get the texture from SWEP.WepSelectIcon, which is a property that most SWEPs are bound to have (unless they use their only 'draw slot' function, which I take in account too) and it's always a texture ID.
Unless there's a function to retreive the texture path from a ID (which I currently don't know despite having searched) I don't really know if I'd be able to get the path directly.