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),
25 mVertexSize(vertexSize),
26 mTexCoordsSize(texCoordSize),
27 mPrimitive(primitive) {
28 if (vertexCount == 0) {
29 mVertices = new float[1];
30 mVertices[0] = 0.0f;
31 mStride = 0;
32 return;
33 }
34
35 size_t stride = vertexSize + texCoordSize;
36 size_t remainder = (stride * vertexCount) / vertexCount;
37 // Since all of the input parameters are unsigned, if stride is less than
38 // either vertexSize or texCoordSize, it must have overflowed. remainder
39 // will be equal to stride as long as stride * vertexCount doesn't overflow.
40 if ((stride < vertexSize) || (remainder != stride)) {
41 ALOGE("Overflow in Mesh(..., %zu, %zu, %zu)", vertexCount, vertexSize, 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
getPositions() const63 float const* Mesh::getPositions() const {
64 return mVertices;
65 }
getPositions()66 float* Mesh::getPositions() {
67 return mVertices;
68 }
69
getTexCoords() const70 float const* Mesh::getTexCoords() const {
71 return mVertices + mVertexSize;
72 }
getTexCoords()73 float* Mesh::getTexCoords() {
74 return mVertices + mVertexSize;
75 }
76
getVertexCount() const77 size_t Mesh::getVertexCount() const {
78 return mVertexCount;
79 }
80
getVertexSize() const81 size_t Mesh::getVertexSize() const {
82 return mVertexSize;
83 }
84
getTexCoordsSize() const85 size_t Mesh::getTexCoordsSize() const {
86 return mTexCoordsSize;
87 }
88
getByteStride() const89 size_t Mesh::getByteStride() const {
90 return mStride * sizeof(float);
91 }
92
getStride() const93 size_t Mesh::getStride() const {
94 return mStride;
95 }
96
97 } /* namespace android */
98