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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 <renderengine/Mesh.h>
     18 
     19 #include <utils/Log.h>
     20 
     21 namespace android {
     22 namespace renderengine {
     23 
     24 Mesh::Mesh(Primitive primitive, size_t vertexCount, size_t vertexSize, size_t texCoordSize)
     25       : mVertexCount(vertexCount),
     26         mVertexSize(vertexSize),
     27         mTexCoordsSize(texCoordSize),
     28         mPrimitive(primitive) {
     29     if (vertexCount == 0) {
     30         mVertices.resize(1);
     31         mVertices[0] = 0.0f;
     32         mStride = 0;
     33         return;
     34     }
     35 
     36     const size_t CROP_COORD_SIZE = 2;
     37     size_t stride = vertexSize + texCoordSize + CROP_COORD_SIZE;
     38     size_t remainder = (stride * vertexCount) / vertexCount;
     39     // Since all of the input parameters are unsigned, if stride is less than
     40     // either vertexSize or texCoordSize, it must have overflowed. remainder
     41     // will be equal to stride as long as stride * vertexCount doesn't overflow.
     42     if ((stride < vertexSize) || (remainder != stride)) {
     43         ALOGE("Overflow in Mesh(..., %zu, %zu, %zu, %zu)", vertexCount, vertexSize, texCoordSize,
     44               CROP_COORD_SIZE);
     45         mVertices.resize(1);
     46         mVertices[0] = 0.0f;
     47         mVertexCount = 0;
     48         mVertexSize = 0;
     49         mTexCoordsSize = 0;
     50         mStride = 0;
     51         return;
     52     }
     53 
     54     mVertices.resize(stride * vertexCount);
     55     mStride = stride;
     56 }
     57 
     58 Mesh::Primitive Mesh::getPrimitive() const {
     59     return mPrimitive;
     60 }
     61 
     62 float const* Mesh::getPositions() const {
     63     return mVertices.data();
     64 }
     65 float* Mesh::getPositions() {
     66     return mVertices.data();
     67 }
     68 
     69 float const* Mesh::getTexCoords() const {
     70     return mVertices.data() + mVertexSize;
     71 }
     72 float* Mesh::getTexCoords() {
     73     return mVertices.data() + mVertexSize;
     74 }
     75 
     76 float const* Mesh::getCropCoords() const {
     77     return mVertices.data() + mVertexSize + mTexCoordsSize;
     78 }
     79 float* Mesh::getCropCoords() {
     80     return mVertices.data() + mVertexSize + mTexCoordsSize;
     81 }
     82 
     83 size_t Mesh::getVertexCount() const {
     84     return mVertexCount;
     85 }
     86 
     87 size_t Mesh::getVertexSize() const {
     88     return mVertexSize;
     89 }
     90 
     91 size_t Mesh::getTexCoordsSize() const {
     92     return mTexCoordsSize;
     93 }
     94 
     95 size_t Mesh::getByteStride() const {
     96     return mStride * sizeof(float);
     97 }
     98 
     99 size_t Mesh::getStride() const {
    100     return mStride;
    101 }
    102 
    103 } // namespace renderengine
    104 } // namespace android
    105