Commit Graph

57 Commits

Author SHA1 Message Date
wm4 eeb5f98758 vo_opengl: handle GL_ARB_uniform_buffer_object with low GLSL versions
Why is this stupid crap being so much a pain for no reason.
2015-11-09 16:24:01 +01:00
Bin Jin 27dc834f37 vo_opengl: implement NNEDI3 prescaler
Implement NNEDI3, a neural network based deinterlacer.

The shader is reimplemented in GLSL and supports both 8x4 and 8x6
sampling window now. This allows the shader to be licensed
under LGPL2.1 so that it can be used in mpv.

The current implementation supports uploading the NN weights (up to
51kb with placebo setting) in two different way, via uniform buffer
object or hard coding into shader source. UBO requires OpenGL 3.1,
which only guarantee 16kb per block. But I find that 64kb seems to be
a default setting for recent card/driver (which nnedi3 is targeting),
so I think we're fine here (with default nnedi3 setting the size of
weights is 9kb). Hard-coding into shader requires OpenGL 3.3, for the
"intBitsToFloat()" built-in function. This is necessary to precisely
represent these weights in GLSL. I tried several human readable
floating point number format (with really high precision as for
single precision float), but for some reason they are not working
nicely, bad pixels (with NaN value) could be produced with some
weights set.

We could also add support to upload these weights with texture, just
for compatibility reason (etc. upscaling a still image with a low end
graphics card). But as I tested, it's rather slow even with 1D
texture (we probably had to use 2D texture due to dimension size
limitation). Since there is always better choice to do NNEDI3
upscaling for still image (vapoursynth plugin), it's not implemented
in this commit. If this turns out to be a popular demand from the
user, it should be easy to add it later.

For those who wants to optimize the performance a bit further, the
bottleneck seems to be:
1. overhead to upload and access these weights, (in particular,
   the shader code will be regenerated for each frame, it's on CPU
   though).
2. "dot()" performance in the main loop.
3. "exp()" performance in the main loop, there are various fast
   implementation with some bit tricks (probably with the help of the
   intBitsToFloat function).

The code is tested with nvidia card and driver (355.11), on Linux.

Closes #2230
2015-11-05 17:38:20 +01:00
Bin Jin 4c43c30421 vo_opengl: add Super-xBR filter for upscaling
Add the Super-xBR filter for image doubling, and the prescaling framework
to support it.

The shader code was ported from MPDN extensions project, with
modification to process luma only.

This commit is largely inspired by code from #2266, with
`gl_transform_trans()` authored by @haasn taken directly.
2015-11-05 17:38:20 +01:00
wm4 17cd6798a6 vo_opengl: move shader file caching to video.c
It's just about loading and cachign small files, not does not
necessarily have anything to do with shaders. Move it to video.c where
it's used.
2015-09-23 22:13:03 +02:00
wm4 e2139488ff vo_opengl: move sampler type mapping to a function 2015-09-10 20:52:50 +02:00
Niklas Haas 97363e176d vo_opengl: implement debanding (and remove source-shader)
The removal of source-shader is a side effect, since this effectively
replaces it - and the video-reading code has been significantly
restructured to make more sense and be more readable.

This means users no longer have to constantly download and maintain a
separate deband.glsl installation alongside mpv, which was the only real
use case for source-shader that we found either way.
2015-09-09 19:19:23 +02:00
Niklas Haas 44eda2177d vo_opengl: remove gl_ prefixes from files in video/out/opengl
This is a bit redundant with the name of the directory itself, and not
in line with existing naming conventions.
2015-09-09 18:09:31 +02:00