The OCIO grading nodes previously pushed null texture handles; they now
push real ShaderJobPayloads whose GLSL is the OCIO-generated dynamic
grading-primary GPU shader — the exact code the C++ path applies, so no
approximation:
- color: grading_primary_function_shader(style) builds a dynamic
GradingPrimaryTransform (LIN/LOG) on the default config, extracts the
GLSL via GpuShaderDesc (function 'ove_grading_primary', resource
prefix ocio_, no LUT textures) and caches it per style + config id.
- eval: OCIO_GRADING_STUBS maps the two node type ids to the grading
style; process_shader_job resolves the stub and splices it into the
node's %1 marker (same wiring as the chromakey OCIO stub); the
pipeline cache key folds the stub text so a config change recompiles.
- nodes: value() pushes a ShaderJobPayload with the C++ value()
rewrite applied to the row — vec4 (RGBM x=master) grading inputs to
the vec3 GPU uniform form (lin: contrast RGB=c*m, offset RGB=c+m,
exposure RGB=2^(c+m); log: lift RGB=c+m, gain c*m, gamma c*m), plus
pivot/saturation floats, the log pivotBlack/pivotWhite normalization
range (0/1), clamp sentinels (NoClampBlack -1 / NoClampWhite 2),
white>black enforcement per frame, and localBypass=false. Generated
uniform names bind by name (the log node's OCIO_NAMESPACE_ id text
normalizes to the ocio_ resource prefix).
- Tests: grading stub generation (analytic GLSL, cache) in color,
end-to-end GPU exposure doubling for lin (+1 stop on 0.2 gray -> 0.4)
and lift for log, node payload rewrite assertions, and the
all-shaders sweep now retries grading stubs. oak-render 181,
oak-node 441, oak-app 272 lib tests pass.
Mike-Solar
49fed365a4