It is not immediately clear why DDS compressed (DXT/S3TC) textures need
to be power of two in size (since nothing in DXT/S3TC intrinsically
requires that). It is only needed due to the "flip the texture upside
down" dance that we do for DDS at load time.
While at it, when logging DXT related messages, tell which texture
was it for, and dimensions. This changes logs like:
```
Unable to load non-power-of-two DXT image resolution, falling back to uncompressed.
Unable to load non-power-of-two DXT image resolution, falling back to uncompressed.
Unable to find a suitable DXT compression, falling back to uncompressed.
```
Into:
```
Unable to load non-power-of-two DXT image resolution, falling back to uncompressed (281splash-dxt1-mips.dds, 890x501).
Unable to load non-power-of-two DXT image resolution, falling back to uncompressed (281splash-dxt5-mips.dds, 890x501).
Unable to find a suitable DXT compression, falling back to uncompressed (281splash-rgba8-mips.dds, 890x501).
```
Pull Request: https://projects.blender.org/blender/blender/pulls/120210
This patch unifies the sRGB to Linear color space conversion between the
CPU and GPU compositors. This is because CPU uses an optimized path that
produces values that are very slightly off. To fix this, for the GPU, we
do the conversion CPU side instead of doing it in a shader. Since images
are cached, the performance implications are not significant.
Another added benefit is that we no longer get differences due to the
order of alpha pre-multiplication and sRGB conversion, demonstrated in
#114305. And we no longer require any preprocessing of the images.
This patch adds some new utilities to the Image Buffer module to assign
float, byte, and compressed buffers along with their color spaces. It
also adds an ownership flag to compressed data. Those were added as a
way to facilitate the implementation.
Pull Request: https://projects.blender.org/blender/blender/pulls/118624
Listing the "Blender Foundation" as copyright holder implied the Blender
Foundation holds copyright to files which may include work from many
developers.
While keeping copyright on headers makes sense for isolated libraries,
Blender's own code may be refactored or moved between files in a way
that makes the per file copyright holders less meaningful.
Copyright references to the "Blender Foundation" have been replaced with
"Blender Authors", with the exception of `./extern/` since these this
contains libraries which are more isolated, any changed to license
headers there can be handled on a case-by-case basis.
Some directories in `./intern/` have also been excluded:
- `./intern/cycles/` it's own `AUTHORS` file is planned.
- `./intern/opensubdiv/`.
An "AUTHORS" file has been added, using the chromium projects authors
file as a template.
Design task: #110784
Ref !110783.
Prior to using OIIO for image loading, DDS files were hard-coded to
always treat files with BC5/ATI2 compression as normal maps[1].
This basically means that the B channel would be reconstructed from the
R,G channels in a particular way. There is a non-standard header flag
(coming from tools like NVTT and various others) that can also be used
to indicate if such processing should take place, and OIIO understands
that flag and acts appropriately. However, not all files have that flag
set.
This patch reverts to the hard-coded behavior to match prior versions.
If the user has explicitly set the OIIO environment variable to say
otherwise, we will respect that setting instead.
[1] https://projects.blender.org/blender/blender/src/branch/blender-v3.5-release/source/blender/imbuf/intern/dds/DirectDrawSurface.cpp#L870
Pull Request: https://projects.blender.org/blender/blender/pulls/109541
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
This checkin will use OIIO to replace the image save/load code for BMP,
DDS, DPX, HDR, PNG, TGA, and TIFF.
This simplifies our build environment, reduces binary duplication,
removes large amounts of hard to maintain code, and fixes some bugs
along the way.
It should also help reduce rare differences between Blender and Cycles
which already uses OIIO for most situations. Or potentially makes them
easier to solve once discovered.
This is a continuation of the work for #101413
Pull Request: https://projects.blender.org/blender/blender/pulls/105785
