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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 #include "Mesh.h"
     18 
     19 #include <utils/Log.h>
     20 
     21 namespace android {
     22 
     23 Mesh::Mesh(Primitive primitive, size_t vertexCount, size_t vertexSize, size_t texCoordSize)
     24     : mVertexCount(vertexCount), mVertexSize(vertexSize), mTexCoordsSize(texCoordSize),
     25       mPrimitive(primitive)
     26 {
     27     if (vertexCount == 0) {
     28         mVertices = new float[1];
     29         mVertices[0] = 0.0f;
     30         mStride = 0;
     31         return;
     32     }
     33 
     34     size_t stride = vertexSize + texCoordSize;
     35     size_t remainder = (stride * vertexCount) / vertexCount;
     36     // Since all of the input parameters are unsigned, if stride is less than
     37     // either vertexSize or texCoordSize, it must have overflowed. remainder
     38     // will be equal to stride as long as stride * vertexCount doesn't overflow.
     39     if ((stride < vertexSize) || (remainder != stride)) {
     40         ALOGE("Overflow in Mesh(..., %zu, %zu, %zu)", vertexCount, vertexSize,
     41                 texCoordSize);
     42         mVertices = new float[1];
     43         mVertices[0] = 0.0f;
     44         mVertexCount = 0;
     45         mVertexSize = 0;
     46         mTexCoordsSize = 0;
     47         mStride = 0;
     48         return;
     49     }
     50 
     51     mVertices = new float[stride * vertexCount];
     52     mStride = stride;
     53 }
     54 
     55 Mesh::~Mesh() {
     56     delete [] mVertices;
     57 }
     58 
     59 Mesh::Primitive Mesh::getPrimitive() const {
     60     return mPrimitive;
     61 }
     62 
     63 
     64 float const* Mesh::getPositions() const {
     65     return mVertices;
     66 }
     67 float* Mesh::getPositions() {
     68     return mVertices;
     69 }
     70 
     71 float const* Mesh::getTexCoords() const {
     72     return mVertices + mVertexSize;
     73 }
     74 float* Mesh::getTexCoords() {
     75     return mVertices + mVertexSize;
     76 }
     77 
     78 
     79 size_t Mesh::getVertexCount() const {
     80     return mVertexCount;
     81 }
     82 
     83 size_t Mesh::getVertexSize() const {
     84     return mVertexSize;
     85 }
     86 
     87 size_t Mesh::getTexCoordsSize() const {
     88     return mTexCoordsSize;
     89 }
     90 
     91 size_t Mesh::getByteStride() const {
     92     return mStride*sizeof(float);
     93 }
     94 
     95 size_t Mesh::getStride() const {
     96     return mStride;
     97 }
     98 
     99 } /* namespace android */
    100