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/*
* Copyright 2010, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef O3D_CORE_CROSS_GPU2D_PATH_CACHE_H_
#define O3D_CORE_CROSS_GPU2D_PATH_CACHE_H_
#include <vector>
#include "base/basictypes.h"
namespace o3d {
namespace gpu2d {
// A cache of the processed triangle mesh for a given path. Because
// these might be expensive to allocate (using malloc/free
// internally), it is recommended to try to reuse them when possible.
// Uncomment the following to obtain debugging information for the edges facing
// the interior region of the mesh.
// #define O3D_CORE_CROSS_GPU2D_PATH_CACHE_DEBUG_INTERIOR_EDGES
class PathCache {
public:
PathCache() {
}
// The number of vertices in the mesh.
unsigned int num_vertices() const;
// Get the base pointer to the vertex information. There are two
// coordinates per vertex. This pointer is valid until the cache is
// cleared or another vertex is added. Returns NULL if there are no
// vertices in the mesh.
const float* vertices() const;
// Get the base pointer to the texture coordinate information. There
// are three coordinates per vertex. This pointer is valid until the
// cache is cleared or another vertex is added. Returns NULL if
// there are no vertices in the mesh.
const float* texcoords() const;
// Adds a vertex's information to the cache. The first two arguments
// are the x and y coordinates of the vertex on the plane; the last
// three arguments are the cubic texture coordinates associated with
// this vertex.
void AddVertex(float x, float y,
float k, float l, float m);
// The number of interior vertices.
unsigned int num_interior_vertices() const;
// Base pointer to the interior vertices; two coordinates per
// vertex, which can be drawn as GL_TRIANGLES. Returns NULL if there
// are no interior vertices in the mesh.
const float* interior_vertices() const;
// Adds an interior vertex to the cache.
void AddInteriorVertex(float x, float y);
// Clears all of the stored vertex information in this cache.
void Clear();
#ifdef O3D_CORE_CROSS_GPU2D_PATH_CACHE_DEBUG_INTERIOR_EDGES
// The number of interior edge vertices
unsigned int num_interior_edge_vertices() const;
// Base pointer to the interior vertices; two coordinates per
// vertex, which can be drawn as GL_LINES. Returns NULL if there are
// no interior edge vertices in the mesh.
const float* interior_edge_vertices() const;
void AddInteriorEdgeVertex(float x, float y);
#endif // O3D_CORE_CROSS_GPU2D_PATH_CACHE_DEBUG_INTERIOR_EDGES
private:
// The two-dimensional vertices of the triangle mesh.
std::vector<float> vertices_;
// The three-dimensional cubic texture coordinates.
std::vector<float> texcoords_;
std::vector<float> interior_vertices_;
#ifdef O3D_CORE_CROSS_GPU2D_PATH_CACHE_DEBUG_INTERIOR_EDGES
// The following is only for debugging
std::vector<float> interior_edge_vertices_;
#endif // O3D_CORE_CROSS_GPU2D_PATH_CACHE_DEBUG_INTERIOR_EDGES
DISALLOW_COPY_AND_ASSIGN(PathCache);
};
} // namespace gpu2d
} // namespace o3d
#endif // O3D_CORE_CROSS_GPU2D_PATH_CACHE_H_
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