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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 
     45     public:
     46         TYPE& operator[](size_t index) { return *reinterpret_cast<TYPE*>(&mData[index * mStride]); }
     47         TYPE const& operator[](size_t index) const {
     48             return *reinterpret_cast<TYPE const*>(&mData[index * mStride]);
     49         }
     50     };
     51 
     52     template <typename TYPE>
     53     VertexArray<TYPE> getPositionArray() {
     54         return VertexArray<TYPE>(getPositions(), mStride);
     55     }
     56 
     57     template <typename TYPE>
     58     VertexArray<TYPE> getTexCoordArray() {
     59         return VertexArray<TYPE>(getTexCoords(), mStride);
     60     }
     61 
     62     Primitive getPrimitive() const;
     63 
     64     // returns a pointer to the vertices positions
     65     float const* getPositions() const;
     66 
     67     // returns a pointer to the vertices  texture coordinates
     68     float const* getTexCoords() const;
     69 
     70     // number of vertices in this mesh
     71     size_t getVertexCount() const;
     72 
     73     // dimension of vertices
     74     size_t getVertexSize() const;
     75 
     76     // dimension of texture coordinates
     77     size_t getTexCoordsSize() const;
     78 
     79     // return stride in bytes
     80     size_t getByteStride() const;
     81 
     82     // return stride in floats
     83     size_t getStride() const;
     84 
     85 private:
     86     Mesh(const Mesh&);
     87     Mesh& operator=(const Mesh&);
     88     Mesh const& operator=(const Mesh&) const;
     89 
     90     float* getPositions();
     91     float* getTexCoords();
     92     float* mVertices;
     93     size_t mVertexCount;
     94     size_t mVertexSize;
     95     size_t mTexCoordsSize;
     96     size_t mStride;
     97     Primitive mPrimitive;
     98 };
     99 
    100 } /* namespace android */
    101 #endif /* SF_RENDER_ENGINE_MESH_H */
    102