Commit Graph

4 Commits

Author SHA1 Message Date
David G Yu
838fce27ab Exposed control for Gregory derivative weight eval
The symbol OPENSUBDIV_GREGORY_EVAL_TRUE_DERIVATIVES
determines the method used to compute derivative weights
for Gregory basis patches.

Setting this symbol during CMake configuration (and
hence during C++ and shader compilation) will enable
the use of true derivative weights.

The default behavior is to use a simpler approximation
for consistency with earlier releases.
2016-10-11 18:50:25 -07:00
David G. Yu
552331f6d9 Added a common patchBasis implementation for Osd
This is used to compute patch basis weights for
the Osd::*Evaluator classes that are unable to
use the C++ implementation from far/patchBasis.h,
e.g. the GLSL, HLSL, OpenCL, and CUDA kernels.

Instead of duplicating this code for each different
kernel language, we share a single implementation
which is minimally adapted to accommodate specific
language restrictions and syntax.

This implementation can also be used by client
shader code executed while drawing, e.g. to
compute patch basis weights for evaluating varying
and face-varying patches.
2016-09-29 09:53:40 -07:00
Takahito Tejima
8d9ae550ff Add a HLSL version of GregoryBasis patch shader.
hlslPatchGregoryBasis.hlsl is an equivalent to glslPatchGregoryBasis.
Update dxViewer to be able to switch among bspline, gregorybasis, legacy
end capping.

also fixes a bug of GLSL legacy gregory shader which had an inconsistent
resource naming with example codes.

It looks like there's still an issue of D3D11 patchParam data fetching.
we'll come back to that bug.
2015-05-20 10:49:45 -07:00
Takahito Tejima
4a4322983f Osd drawing API refactoring.
Remove DrawRegistry from osd layer and put a simple shader caching
utility into examples/common. osd layer only provides patch shader
snippet and let client configure and compile the code. Clients also
maintain the lifetime of shader object, which is preferable for the
actual application integration.

update all examples to use the new scheme.
2015-05-13 17:35:46 -07:00