1 /* 2 * Copyright (C) 2008 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 package com.example.android.apis.graphics.kube; 18 19 import android.util.Log; 20 21 import java.nio.ShortBuffer; 22 import java.util.ArrayList; 23 24 public class GLFace { 25 GLFace()26 public GLFace() { 27 28 } 29 30 // for triangles GLFace(GLVertex v1, GLVertex v2, GLVertex v3)31 public GLFace(GLVertex v1, GLVertex v2, GLVertex v3) { 32 addVertex(v1); 33 addVertex(v2); 34 addVertex(v3); 35 } 36 // for quadrilaterals GLFace(GLVertex v1, GLVertex v2, GLVertex v3, GLVertex v4)37 public GLFace(GLVertex v1, GLVertex v2, GLVertex v3, GLVertex v4) { 38 addVertex(v1); 39 addVertex(v2); 40 addVertex(v3); 41 addVertex(v4); 42 } 43 addVertex(GLVertex v)44 public void addVertex(GLVertex v) { 45 mVertexList.add(v); 46 } 47 48 // must be called after all vertices are added setColor(GLColor c)49 public void setColor(GLColor c) { 50 51 int last = mVertexList.size() - 1; 52 if (last < 2) { 53 Log.e("GLFace", "not enough vertices in setColor()"); 54 } else { 55 GLVertex vertex = mVertexList.get(last); 56 57 // only need to do this if the color has never been set 58 if (mColor == null) { 59 while (vertex.color != null) { 60 mVertexList.add(0, vertex); 61 mVertexList.remove(last + 1); 62 vertex = mVertexList.get(last); 63 } 64 } 65 66 vertex.color = c; 67 } 68 69 mColor = c; 70 } 71 getIndexCount()72 public int getIndexCount() { 73 return (mVertexList.size() - 2) * 3; 74 } 75 putIndices(ShortBuffer buffer)76 public void putIndices(ShortBuffer buffer) { 77 int last = mVertexList.size() - 1; 78 79 GLVertex v0 = mVertexList.get(0); 80 GLVertex vn = mVertexList.get(last); 81 82 // push triangles into the buffer 83 for (int i = 1; i < last; i++) { 84 GLVertex v1 = mVertexList.get(i); 85 buffer.put(v0.index); 86 buffer.put(v1.index); 87 buffer.put(vn.index); 88 v0 = v1; 89 } 90 } 91 92 private ArrayList<GLVertex> mVertexList = new ArrayList<GLVertex>(); 93 private GLColor mColor; 94 } 95