[PD] GEM : GLSL Mixer - working 2 channel video mixer example
Hans-Christoph Steiner
hans at eds.org
Mon Dec 24 21:29:02 CET 2007
Nice, works for me. Is the idea that shaders are a efficient way of
mixing video?
.hc
On Dec 24, 2007, at 12:04 PM, vade wrote:
> Hello
>
> Here is a 2 channel mixer using overlay blend mode with GLSL. This
> works, is decently fast and gives me the expected result.
>
> If you want more blend modes, feel free to grab them from http://
> 001.vade.info (or elsewhere, most are trivial to figure out)- the
> glsl shaders for the mixers use the same subroutine layout in the
> glsl, so it is trivial to swap. I did not include them out of sheer
> laziness.
>
> Caveats with PD 0.4.03 Extended nightly from Dec 24th (Mac OS X
> 10.5.1, QT 7.3, Intel):
>
> - had to edit the GLSL program to fix multitexture coordinate
> issue. Only can use the texture dims from the zeroths texture unit.
> - could not get sampler2DRect working at all - only had a single
> texel mapped it seemed.
> - had weird issue where I would sometimes have to close the gemwin
> (0, destroy) and then re create it to see the textures assigned to
> texture units.
> this happened most often after closing and re-opening the patch.
>
> Please see the included question(s) within the PD patch concerning
> using framebuffer to grab the output of the rendered shader and
> send it to yet another shader. Ive included an exposure shader in
> an attempt to make a chain of GLSL effects. I however could not get
> gemframebuffer to output any usable texture after using glslprogram.
>
> Thanks, hope this is helpful to those out there
>
> FUDDLE DUDDLE !@#!@#!@#()*!@#(*@#
>
> :)
>
> <GEM_glsl_2_channel_mixer.zip>
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