From Garry's Mod
Enumerations used by GetRenderTargetEx. Clientside only.
Warning! Decimal values are for reference only! The actual value may be different between two Garry's Mod versions.
|RT_SIZE_NO_CHANGE||0||Only allowed for render targets that don't want a depth buffer (because if they have a depth buffer, the render target must be less than or equal to the size of the framebuffer).|
|RT_SIZE_DEFAULT||1||Don't play with the specified width and height other than making sure it fits in the framebuffer.|
|RT_SIZE_PICMIP||2||Apply picmip to the render target's width and height.|
|RT_SIZE_HDR||3||frame_buffer_width / 4|
|RT_SIZE_FULL_FRAME_BUFFER||4||Same size as frame buffer, or next lower power of 2 if we can't do that.|
|RT_SIZE_OFFSCREEN||5||Target of specified size, don't mess with dimensions|
|RT_SIZE_FULL_FRAME_BUFFER_ROUNDED_UP||6||Same size as the frame buffer, rounded up if necessary for systems that can't do non-power of two textures.|