blender/intern/cycles/render/CMakeLists.txt
Brecht Van Lommel 1b4961b318 OpenColorIO: upgrade to version 2.0.0
Ref T84819

Build System
============

This is an API breaking new version, and the updated code only builds with
OpenColorIO 2.0 and later. Adding backwards compatibility was too complicated.

* Tinyxml was replaced with Expat, adding a new dependency.
* Yaml-cpp is now built as a dependency on Unix, as was already done on Windows.
* Removed currently unused LCMS code.
* Pystring remains built as part of OCIO itself, since it has no good build system.
* Linux and macOS check for the OpenColorIO verison, and disable it if too old.

Ref D10270

Processors and Transforms
=========================

CPU processors now need to be created to do CPU processing. These are cached
internally, but the cache lookup is not fast enough to execute per pixel or
texture sample, so for performance these are now also exposed in the C API.

The C API for transforms will no longer be needed afer all changes, so remove
it to simplify the API and fallback implementation.

Ref D10271

Display Transforms
==================

Needs a bit more manual work constructing the transform. LegacyViewingPipeline
could also have been used, but isn't really any simpler and since it's legacy
we better not rely on it.

We moved more logic into the opencolorio module, to simplify the API. There is
no need to wrap a dozen functions just to be able to do this in C rather than C++.
It's also tightly coupled to the GPU shader logic, and so should be in the same
module.

Ref D10271

GPU Display Shader
==================

To avoid baking exposure and gamma into the GLSL shader and requiring slow
recompiles when tweaking, we manually apply them in the shader. This leads
to some logic duplicaton between the CPU and GPU display processor, but it
seems unavoidable.

Caching was also changed. Previously this was done both on the imbuf and
opencolorio module levels. Now it's all done in the opencolorio module by
simply matching color space names. We no longer use cacheIDs from OpenColorIO
since computing them is expensive, and they are unlikely to match now that
more is baked into the shader code.

Shaders can now use multiple 2D textures, 3D textures and uniforms, rather
than a single 3D texture. So allocating and binding those adds some code.

Color space conversions for blending with overlays is now hardcoded in the
shader. This was using harcoded numbers anyway, if this every becomes a
general OpenColorIO transform it can be changed, but for now there is no
point to add code complexity.

Ref D10273

CIE XYZ
=======

We need standard CIE XYZ values for rendering effects like blackbody emission.
The relation to the scene linear role is based on OpenColorIO configuration.

In OpenColorIO 2.0 configs roles can no longer have the same name as color
spaces, which means our XYZ role and colorspace in the configuration give an
error.

Instead use the new standard aces_interchange role, which relates scene linear
to a known scene referred color space. Compatibility with the old XYZ role is
preserved, if the configuration file has no conflicting names.

Also includes a non-functional change to the configuraton file to use an
XYZ-to-ACES matrix instead of REC709-to-ACES, makes debugging a little easier
since the matrix is the same one we have in the code now and that is also
found easily in the ACES specs.

Ref D10274
2021-02-12 19:06:35 +01:00

176 lines
2.8 KiB
CMake

# Copyright 2011-2020 Blender Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set(INC
..
../../glew-mx
../../sky/include
)
set(INC_SYS
${GLEW_INCLUDE_DIR}
)
set(SRC
alembic.cpp
attribute.cpp
background.cpp
bake.cpp
buffers.cpp
camera.cpp
colorspace.cpp
constant_fold.cpp
coverage.cpp
denoising.cpp
film.cpp
geometry.cpp
graph.cpp
hair.cpp
image.cpp
image_oiio.cpp
image_sky.cpp
image_vdb.cpp
integrator.cpp
jitter.cpp
light.cpp
merge.cpp
mesh.cpp
mesh_displace.cpp
mesh_subdivision.cpp
nodes.cpp
procedural.cpp
object.cpp
osl.cpp
particles.cpp
curves.cpp
scene.cpp
session.cpp
shader.cpp
sobol.cpp
stats.cpp
svm.cpp
tables.cpp
tile.cpp
volume.cpp
)
set(SRC_HEADERS
alembic.h
attribute.h
bake.h
background.h
buffers.h
camera.h
colorspace.h
constant_fold.h
coverage.h
denoising.h
film.h
geometry.h
graph.h
hair.h
image.h
image_oiio.h
image_sky.h
image_vdb.h
integrator.h
light.h
jitter.h
merge.h
mesh.h
nodes.h
object.h
osl.h
particles.h
procedural.h
curves.h
scene.h
session.h
shader.h
sobol.h
stats.h
svm.h
tables.h
tile.h
volume.h
)
set(LIB
cycles_bvh
cycles_device
cycles_subd
cycles_util
)
if(CYCLES_STANDALONE_REPOSITORY)
list(APPEND LIB extern_sky)
else()
list(APPEND LIB bf_intern_sky)
endif()
if(WITH_CYCLES_OSL)
list(APPEND LIB
cycles_kernel_osl
)
SET_PROPERTY(SOURCE osl.cpp PROPERTY COMPILE_FLAGS ${RTTI_DISABLE_FLAGS})
endif()
if(WITH_OPENCOLORIO)
add_definitions(-DWITH_OCIO)
include_directories(
SYSTEM
${OPENCOLORIO_INCLUDE_DIRS}
)
list(APPEND LIB
${OPENCOLORIO_LIBRARIES}
)
if(WIN32)
add_definitions(-DOpenColorIO_SKIP_IMPORTS)
endif()
endif()
if(WITH_OPENVDB)
add_definitions(-DWITH_OPENVDB ${OPENVDB_DEFINITIONS})
list(APPEND INC_SYS
${OPENVDB_INCLUDE_DIRS}
)
list(APPEND LIB
${OPENVDB_LIBRARIES}
)
endif()
if(WITH_ALEMBIC)
add_definitions(-DWITH_ALEMBIC)
list(APPEND INC_SYS
${ALEMBIC_INCLUDE_DIRS}
)
list(APPEND LIB
${ALEMBIC_LIBRARIES}
)
endif()
if(WITH_NANOVDB)
list(APPEND INC_SYS
${NANOVDB_INCLUDE_DIRS}
)
endif()
include_directories(${INC})
include_directories(SYSTEM ${INC_SYS})
add_definitions(${GL_DEFINITIONS})
cycles_add_library(cycles_render "${LIB}" ${SRC} ${SRC_HEADERS})