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
Mesh(Primitive primitive,size_t vertexCount,size_t vertexSize,size_t texCoordSize)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
~Mesh()55 Mesh::~Mesh() {
56 delete [] mVertices;
57 }
58
getPrimitive() const59 Mesh::Primitive Mesh::getPrimitive() const {
60 return mPrimitive;
61 }
62
63
getPositions() const64 float const* Mesh::getPositions() const {
65 return mVertices;
66 }
getPositions()67 float* Mesh::getPositions() {
68 return mVertices;
69 }
70
getTexCoords() const71 float const* Mesh::getTexCoords() const {
72 return mVertices + mVertexSize;
73 }
getTexCoords()74 float* Mesh::getTexCoords() {
75 return mVertices + mVertexSize;
76 }
77
78
getVertexCount() const79 size_t Mesh::getVertexCount() const {
80 return mVertexCount;
81 }
82
getVertexSize() const83 size_t Mesh::getVertexSize() const {
84 return mVertexSize;
85 }
86
getTexCoordsSize() const87 size_t Mesh::getTexCoordsSize() const {
88 return mTexCoordsSize;
89 }
90
getByteStride() const91 size_t Mesh::getByteStride() const {
92 return mStride*sizeof(float);
93 }
94
getStride() const95 size_t Mesh::getStride() const {
96 return mStride;
97 }
98
99 } /* namespace android */
100