forked from bartvdbraak/blender
a2a8e71210
Only affects internal API, bout could be exposed as an option for the compatibility reasons with other software. Is a part of some ongoing development of multires, but might or might not be used.
162 lines
7.0 KiB
C
162 lines
7.0 KiB
C
// Copyright 2015 Blender Foundation. All rights reserved.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// Author: Sergey Sharybin
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#ifndef OPENSUBDIV_CONVERTER_CAPI_H_
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#define OPENSUBDIV_CONVERTER_CAPI_H_
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#include <stdint.h> // for bool
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#include "opensubdiv_capi_type.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct OpenSubdiv_Converter {
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OpenSubdiv_SchemeType (*getSchemeType)(
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const struct OpenSubdiv_Converter* converter);
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OpenSubdiv_VtxBoundaryInterpolation (*getVtxBoundaryInterpolation)(
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const struct OpenSubdiv_Converter* converter);
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OpenSubdiv_FVarLinearInterpolation (*getFVarLinearInterpolation)(
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const struct OpenSubdiv_Converter* converter);
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// Denotes whether this converter specifies full topology, which includes
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// vertices, edges, faces, vertices+edges of a face and edges/faces of a
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// vertex.
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// Otherwise this converter will only provide number of vertices and faces,
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// and vertices of faces. The rest of topology will be created by OpenSubdiv.
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//
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// NOTE: Even if converter does not provide full topology, it still needs
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// to provide number of edges and vertices-of-edge. Those are used to assign
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// topology tags.
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bool (*specifiesFullTopology)(const struct OpenSubdiv_Converter* converter);
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//////////////////////////////////////////////////////////////////////////////
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// Global geometry counters.
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// Number of faces/edges/vertices in the base mesh.
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int (*getNumFaces)(const struct OpenSubdiv_Converter* converter);
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int (*getNumEdges)(const struct OpenSubdiv_Converter* converter);
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int (*getNumVertices)(const struct OpenSubdiv_Converter* converter);
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//////////////////////////////////////////////////////////////////////////////
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// Face relationships.
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// Number of vertices the face consists of.
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int (*getNumFaceVertices)(const struct OpenSubdiv_Converter* converter,
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const int face_index);
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// Array of vertex indices the face consists of.
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void (*getFaceVertices)(const struct OpenSubdiv_Converter* converter,
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const int face_index,
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int* face_vertices);
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// Array of edge indices the face consists of.
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// Aligned with the vertex indices array, edge i connects face vertex i
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// with face index i+1.
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void (*getFaceEdges)(const struct OpenSubdiv_Converter *converter,
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const int face_index,
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int *face_edges);
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//////////////////////////////////////////////////////////////////////////////
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// Edge relationships.
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// Vertices the edge consists of.
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void (*getEdgeVertices)(const struct OpenSubdiv_Converter* converter,
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const int edge_index,
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int edge_vertices[2]);
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// Number of faces which are sharing the given edge.
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int (*getNumEdgeFaces)(const struct OpenSubdiv_Converter* converter,
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const int edge_index);
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// Array of face indices which are sharing the given edge.
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void (*getEdgeFaces)(const struct OpenSubdiv_Converter* converter,
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const int edge,
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int* edge_faces);
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// Edge sharpness (aka crease).
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float (*getEdgeSharpness)(const struct OpenSubdiv_Converter* converter,
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const int edge_index);
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//////////////////////////////////////////////////////////////////////////////
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// Vertex relationships.
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// Number of edges which are adjacent to the given vertex.
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int (*getNumVertexEdges)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index);
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// Array fo edge indices which are adjacent to the given vertex.
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void (*getVertexEdges)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index,
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int* vertex_edges);
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// Number of faces which are adjacent to the given vertex.
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int (*getNumVertexFaces)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index);
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// Array fo face indices which are adjacent to the given vertex.
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void (*getVertexFaces)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index,
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int* vertex_faces);
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// Check whether vertex is to be marked as an infinite sharp.
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// This is a way to make sharp vertices which are adjacent to a loose edges.
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bool (*isInfiniteSharpVertex)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index);
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// If vertex is not infinitely sharp, this is it's actual sharpness.
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float (*getVertexSharpness)(const struct OpenSubdiv_Converter* converter,
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const int vertex_index);
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//////////////////////////////////////////////////////////////////////////////
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// Face-varying data.
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/////////////////////////////////////
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// UV coordinates.
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// Number of UV layers.
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int (*getNumUVLayers)(const struct OpenSubdiv_Converter* converter);
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// We need some corner connectivity information, which might not be trivial
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// to be gathered (might require multiple matching calculations per corver
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// query).
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// precalc() is called before any corner connectivity or UV coordinate is
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// queried from the given layer, allowing converter to calculate and cache
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// complex complex-to-calculate information.
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// finish() is called after converter is done porting UV layer to OpenSubdiv,
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// allowing to free cached data.
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void (*precalcUVLayer)(const struct OpenSubdiv_Converter* converter,
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const int layer_index);
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void (*finishUVLayer)(const struct OpenSubdiv_Converter* converter);
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// Get number of UV coordinates in the current layer (layer which was
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// specified in precalcUVLayer().
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int (*getNumUVCoordinates)(const struct OpenSubdiv_Converter* converter);
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// For the given face index and its corner (known as loop in Blender)
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// get corrsponding UV coordinate index.
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int (*getFaceCornerUVIndex)(const struct OpenSubdiv_Converter* converter,
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const int face_index,
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const int corner_index);
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//////////////////////////////////////////////////////////////////////////////
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// User data associated with this converter.
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void (*freeUserData)(const struct OpenSubdiv_Converter* converter);
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void* user_data;
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} OpenSubdiv_Converter;
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#ifdef __cplusplus
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}
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#endif
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#endif /* OPENSUBDIV_CONVERTER_CAPI_H_ */
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