Commit Graph

26 Commits

Author SHA1 Message Date
barry
e8fdec9f88 Made use of newer GLSL adaptive tess functions in patch shaders:
- replaced use of "LimitPoints" functions in all patch shaders
    - removed the unreleased "LimitPointsTriangle" functions
    - added internal tess functions for processing patch boundaries
    - updated Bezier quad and tri tess evaluation to use boundary functions
2019-01-30 10:25:04 -08:00
David G. Yu
99b214ca92 Workaround GLSL shader compiler on AMD
Added a size specifier to the shader output array declaration
in the BSpline control shader. This seems to be required by the
GLSL compiler on AMD and is harmless elsewhere.
2015-05-31 10:26:50 -07:00
David G. Yu
bd6d9b4ea9 Sync'd screen-space single-crease patch fix to DX 2015-05-31 08:18:18 -07:00
Takahito Tejima
2102b4f6b2 Fix screen-space tessellation on single crease patch.
- Rename OsdPerPatchVertexBSpline to OsdPerPatchVertexBezier
- Split OsdGetTessLevels into 3 functions,
  OsdGetTessLevelUniform, OsdGetTessLevelAdaptiveRefinedPoints,
  OsdGetTessLevelAdaptiveLimitPoints.
- Add a regression test shape : catmark_single_crease
2015-05-30 22:41:24 -07:00
David G. Yu
c245407854 Re-organized patch tessellation shader code
This change refactors the GLSL and HLSL patch shader code so that
most of the work is implemented within a library of common functions
and the remaining shader snippets just manage plumbing.

There is more to do here:
  - varying and face-varying data can be managed entirely by the client
  - similarly, displacement can be implemented in client code
  - there's still quite a bit of residual boiler-plate code needed
    in each shader stage that we should be able to wrap up in a more
    convenient form.
2015-05-29 23:00:19 -07:00
David G Yu
f4a8cafe86 Sync'ed up GLSL and HLSL patch shader source.
Cleaned up the Legacy Gregory shader source by accessing buffer
data through helper functions.

Switched to performing tessellation in untransformed (object) space.
2015-05-21 09:56:25 -07:00
David G Yu
8716a8eebf Fixed example code use of single crease patches
Also made a couple minor changes to true up the GLSL patch shaders.
2015-05-15 11:52:41 -07:00
David G Yu
8b4ef28116 Updated handling of patchParam and patchCoord
Each patch has a corresponding patchParam. This is a set of three values
specifying additional information about the patch:

   faceId    -- topological face identifier (e.g. Ptex FaceId)
   bitfield  -- refinement-level, non-quad, boundary, transition, uv-offset
   sharpness -- crease sharpness for a single-crease patch

These are stored in OsdPatchParamBuffer indexed by the value returned
from OsdGetPatchIndex() which is a function of the current PrimitiveID
along with an optional client provided offset.

Accessors are provided to extract values from a patchParam. These are
all named OsdGetPatch*().

While drawing patches, the patchParam is condensed into a patchCoord which
has four values (u, v, faceLevel, faceId). These patchCoords are treated
as int values during per-prim processing but are converted to float values
during per-vertex processing where the values are interpolated.

Also, cleaned up more of the shader namespace by giving an Osd prefix
to public functions, and consolidated boundary and transition handling
code into the PatchCommon shader files. The functions determining
tessellation levels are now all named OsdGetTessLevel*().
2015-05-06 13:47:33 -07:00
David G Yu
7d9dcf8c03 Added a new screen-space adaptive tessellation metric which
computes edge lengths using limit surface points. Made this
the default screen-space metric so that we avoid cracks when
using Gregory Basis or Regular B-spline end caps.

The alternative method which computes edge lengths using the
distance between B-spline control points is still available.

Added a diagram and comments to explain how the control
points and limit points are organized.
2015-04-21 14:17:29 -07:00
Takahito Tejima
c58e63c8d5 Refactor single crease patch to be in unfined shader. 2015-04-17 16:26:57 -07:00
David G Yu
759513d2dc Fixed adaptive tessellation and removed debug code 2015-04-17 12:04:21 -07:00
David G Yu
010a31efc4 Checkpoint changes to unify adaptive patch drawing. 2015-04-17 07:42:53 -07:00
David G Yu
1e00056d8a Improved stability on OSX drivers by not declaring unused shader in/out vars. 2014-10-23 15:59:05 -07:00
Takahito Tejima
c0907c7bc1 Introduces 'single-crease patch' : implements "Efficient Evaluation of Semi-Smooth Creases in
Catmull-Clark Subdivision Surfaces", Niessner et al, Eurographics 2012.

This change includes;
-topology identification for single-crease patch during adaptive refinement.
-patch array population (similar to boundary)
-sharpness buffer generation
-glsl shader

Eval stuffs will be coming.
2014-10-13 08:52:09 -07:00
manuelk
639788abbe Fix vec array initialization in GLSL & HLSL (should fix some DX compiler problems)
Fixes #354
2014-10-04 16:22:43 -07:00
Takahito Tejima
f7f2ca2581 Move uniform block definitions out of osd common shader into client shader.
Important notice: all client shader code must have following functions and compose them to osd intrinsic shaders (vertex/tessEval/tessControl)

mat4 OsdModelViewMatrix()
mat4 OsdProjectionMatrix()
mat4 OsdModelViewProjectionMatrix()
float OsdTessLevel()
int OsdGreogryQuadOffsetBase()
int OsdPrimitiveIdBase()

We probably should write a utility class for basic binding of them, to make client code simpler.
2013-12-03 15:59:38 -08:00
manuelk
3ae50d1c50 Amending Apache license language & file headers.
New text:

     Copyright 2013 Pixar

     Licensed under the Apache License, Version 2.0 (the "Apache License")
     with the following modification; you may not use this file except in
     compliance with the Apache License and the following modification to it:
     Section 6. Trademarks. is deleted and replaced with:

     6. Trademarks. This License does not grant permission to use the trade
        names, trademarks, service marks, or product names of the Licensor
        and its affiliates, except as required to comply with Section 4(c) of
        the License and to reproduce the content of the NOTICE file.

     You may obtain a copy of the Apache License at

         http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the Apache License with the above modification is
     distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     KIND, either express or implied. See the Apache License for the specific
     language governing permissions and limitations under the Apache License.
2013-09-26 12:04:57 -07:00
Takahito Tejima
c2e0d06f56 Second derivatives computation, fix tangent/bitangent length 2013-09-20 18:23:28 -07:00
Takahito Tejima
51a45b598d Updating EULA 2013-07-18 14:19:50 -07:00
Takahito Tejima
a13c0565e4 Renamed texture buffers and uniforms
g_VertexBuffer -> OsdVertexBuffer
g_ValenceBuffer -> OsdValenceBuffer
g_QuadOffsetBuffer -> OsdQuadOffsetBuffer
g_ptexIndicesBuffer -> OsdPatchParamBuffer
g_uvFVarBuffer -> OsdFVarDataBuffer
LevelBase -> PrimitiveIdBase
2013-07-18 12:57:26 -07:00
David G Yu
d2abf61c56 Added adaptive tess of user varying values
This isn't necessarily a final design, but
it gets enough of the pieces in place to move
forward.
2013-06-28 14:05:47 -07:00
David G Yu
15b467dda9 Fixed preprocessor syntax for shader portability 2013-06-28 10:10:25 -07:00
David G Yu
8fae6511f7 Continued bicubic patch shader cleanup
Removed superfluous vertex and fragment/pixel shaders
2013-06-27 17:26:22 -07:00
Takahito Tejima
184e90f9a1 Add fractional spacing mode for patch rendering. 2013-06-27 13:34:25 -07:00
David G Yu
09f6f9e2d5 Fixed num verts tested for patch frustum culling 2013-06-24 12:43:02 -07:00
David G Yu
9bab9185ab Partial cleanup of bicubic patch shader source
- Added OSD_ prefix to preprocessor symbols
- Adjusted transition sub-patch parameterization to be
  consistent with non-transition patches
- Unified BSpline shader code
- Removed duplicate Boundary, Corner, and Transition shader source
- Fixed a few discrepancies in the remaining duplicate code paths
2013-06-24 12:03:57 -07:00