[Feature] Multiple passes for glsl shaders

[Selur]

Just, tested it:

# Imports
import vapoursynth as vs
# getting Vapoursynth core
core = vs.core
# Loading Plugins
core.std.LoadPlugin(path="I:/Hybrid/64bit/vsfilters/Support/libvs_placebo.dll")
core.std.LoadPlugin(path="I:/Hybrid/64bit/vsfilters/SourceFilter/FFMS2/ffms2.dll")
# source: 'G:\TestClips&Co\files\test.avi'
# current color space: YUV420P8, bit depth: 8, resolution: 640x352, fps: 25, color matrix: 470bg, yuv luminance scale: limited, scanorder: progressive
# Loading source using FFMS2
clip = core.ffms2.Source(source="G:/TestClips&Co/files/test.avi",cachefile="E:/Temp/avi_6c441f37d9750b62d59f16ecdbd59393_853323747.ffindex",format=vs.YUV420P8,alpha=False)
# making sure input color matrix is set as 470bg
clip = core.resize.Bicubic(clip, matrix_in_s="470bg",range_s="limited")
# making sure frame rate is set to 25
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# Setting color range to TV (limited) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=1)
# GLSL filter: ACNet.glsl
# adjusting color space from YUV420P8 to YUV444P16 for VsGLSLFilter
clip = core.resize.Bicubic(clip=clip, format=vs.YUV444P16, range_s="limited")
clip = core.placebo.Shader(clip=clip, shader="I:/Hybrid/64bit/vsfilters/GLSL/ACNet.glsl", width=640, height=352)
# GLSL filter: adaptive-sharpen.glsl
clip = core.placebo.Shader(clip=clip, shader="I:/Hybrid/64bit/vsfilters/GLSL/adaptive-sharpen.glsl", width=640, height=352)
# adjusting output color from: YUV444P16 to YUV420P8 for x264Model
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P8, range_s="limited")
# set output frame rate to 25.000fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# Output
clip.set_output()

-> had no problem here using multiple GLSL filters,....
You need to use "Filter Queue" instead of the default "Filter Order" to add multiple instances,...
read: [INFO] About Vapoursynth Filter Order/Queue
Hybrid allows to add:

• (most) filters multiple times
  
• (most) filters only on frame sections
  

I'm also working on allowing to apply (most) filters only on parts of the image, but so far I only had time to add this for 'Levels'. (I mainly have to adjust the GUI to support this, the background code is already implemented, but I haven't found the time to add this). Also this is more of a 'gimmicky' feature for me as nobody required it and I sometimes use something likt that to see how different denoisers act on a source by dividing the source in X sections and filter each section with a different denoiser.

Cu Selur