mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License
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// and the following modification to it: Section 6 Trademarks.
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// deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the
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// trade names, trademarks, service marks, or product names of the
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// Licensor and its affiliates, except as required for reproducing
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// the content of the NOTICE file.
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//
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific
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// language governing permissions and limitations under the
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// License.
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//
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#ifndef OSD_CPU_EVAL_LIMIT_CONTROLLER_H
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#define OSD_CPU_EVAL_LIMIT_CONTROLLER_H
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#include "../version.h"
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#include "../osd/evalLimitContext.h"
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#include "../osd/cpuEvalLimitContext.h"
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#include "../osd/vertexDescriptor.h"
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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/// \brief CPU controler for limit surface evaluation.
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///
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/// A CPU-driven controller that can be called to evaluate samples on the limit
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/// surface for a given EvalContext.
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///
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class OsdCpuEvalLimitController {
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public:
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/// Constructor.
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OsdCpuEvalLimitController();
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/// Destructor.
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~OsdCpuEvalLimitController();
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/// \brief Represents a location on the limit surface
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struct OsdEvalCoords {
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int face; // Ptex unique face ID
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float u,v; // local u,v
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};
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/// \brief Vertex interpolation of samples at the limit
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///
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/// Evaluates "vertex" interpolation of a sample on the surface limit.
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///
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/// Warning : this function is re-entrant but it breaks the Osd API pattern
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/// by requiring the client code to bind and unbind the vertex buffers to
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/// the EvalLimitContext.
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///
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/// Ex :
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/// \code
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/// evalCtxt->BindVertexBuffers( ... );
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///
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/// parallel_for( int index=0; i<nsamples; ++index ) {
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/// evalCtrlr->EvalLimitSample( coord, evalCtxt, index );
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/// }
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///
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/// evalCtxt->UnbindVertexBuffers();
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/// \endcode
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///
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/// @param coords location on the limit surface to be evaluated
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///
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/// @param context the EvalLimitContext that the controller will evaluate
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///
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/// @param index the index of the vertex in the output buffers bound to the
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/// context
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///
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/// @return the number of samples found (0 if the location was tagged as a hole
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/// or the coordinate was invalid)
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///
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template<class VERTEX_BUFFER, class OUTPUT_BUFFER>
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int EvalLimitSample( OpenSubdiv::OsdEvalCoords const & coords,
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OsdCpuEvalLimitContext * context,
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unsigned int index ) {
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if (not context)
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return 0;
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int n = _EvalLimitSample( coords, context, index );
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return n;
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}
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private:
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int _EvalLimitSample( OpenSubdiv::OsdEvalCoords const & coords,
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OsdCpuEvalLimitContext * context,
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unsigned int index );
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};
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif /* OSD_CPU_EVAL_LIMIT_CONTROLLER_H */
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