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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SF_RENDER_ENGINE_MESH_H
     18 #define SF_RENDER_ENGINE_MESH_H
     19 
     20 #include <stdint.h>
     21 
     22 namespace android {
     23 
     24 class Mesh {
     25 public:
     26     enum Primitive {
     27         TRIANGLES       = 0x0004,       // GL_TRIANGLES
     28         TRIANGLE_STRIP  = 0x0005,       // GL_TRIANGLE_STRIP
     29         TRIANGLE_FAN    = 0x0006        // GL_TRIANGLE_FAN
     30     };
     31 
     32     Mesh(Primitive primitive, size_t vertexCount, size_t vertexSize, size_t texCoordsSize = 0);
     33     ~Mesh();
     34 
     35     /*
     36      * VertexArray handles the stride automatically.
     37      */
     38     template <typename TYPE>
     39     class VertexArray {
     40         friend class Mesh;
     41         float* mData;
     42         size_t mStride;
     43         VertexArray(float* data, size_t stride) : mData(data), mStride(stride) { }
     44     public:
     45         TYPE& operator[](size_t index) {
     46             return *reinterpret_cast<TYPE*>(&mData[index*mStride]);
     47         }
     48         TYPE const& operator[](size_t index) const {
     49             return *reinterpret_cast<TYPE const*>(&mData[index*mStride]);
     50         }
     51     };
     52 
     53     template <typename TYPE>
     54     VertexArray<TYPE> getPositionArray() { return VertexArray<TYPE>(getPositions(), mStride); }
     55 
     56     template <typename TYPE>
     57     VertexArray<TYPE> getTexCoordArray() { return VertexArray<TYPE>(getTexCoords(), mStride); }
     58 
     59     Primitive getPrimitive() const;
     60 
     61     // returns a pointer to the vertices positions
     62     float const* getPositions() const;
     63 
     64     // returns a pointer to the vertices  texture coordinates
     65     float const* getTexCoords() const;
     66 
     67     // number of vertices in this mesh
     68     size_t getVertexCount() const;
     69 
     70     // dimension of vertices
     71     size_t getVertexSize() const;
     72 
     73     // dimension of texture coordinates
     74     size_t getTexCoordsSize() const;
     75 
     76     // return stride in bytes
     77     size_t getByteStride() const;
     78 
     79     // return stride in floats
     80     size_t getStride() const;
     81 
     82 private:
     83     Mesh(const Mesh&);
     84     Mesh& operator = (const Mesh&);
     85     Mesh const& operator = (const Mesh&) const;
     86 
     87     float* getPositions();
     88     float* getTexCoords();
     89     float* mVertices;
     90     size_t mVertexCount;
     91     size_t mVertexSize;
     92     size_t mTexCoordsSize;
     93     size_t mStride;
     94     Primitive mPrimitive;
     95 };
     96 
     97 
     98 } /* namespace android */
     99 #endif /* SF_RENDER_ENGINE_MESH_H */
    100