1 /* 2 * Copyright (C) 2009 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 package com.android.camera.ui; 17 18 import android.opengl.GLSurfaceView.EGLConfigChooser; 19 import javax.microedition.khronos.egl.EGL10; 20 import javax.microedition.khronos.egl.EGLConfig; 21 import javax.microedition.khronos.egl.EGLDisplay; 22 23 /* 24 * The code is copied/adapted from 25 * <code>android.opengl.GLSurfaceView.BaseConfigChooser</code>. Here we try to 26 * choose a configuration that support RGBA_8888 format and if possible, 27 * with stencil buffer, but is not required. 28 */ 29 class CameraEGLConfigChooser implements EGLConfigChooser { 30 31 private static final int COLOR_BITS = 8; 32 33 private int mStencilBits; 34 35 private final int mConfigSpec[] = new int[] { 36 EGL10.EGL_RED_SIZE, COLOR_BITS, 37 EGL10.EGL_GREEN_SIZE, COLOR_BITS, 38 EGL10.EGL_BLUE_SIZE, COLOR_BITS, 39 EGL10.EGL_ALPHA_SIZE, COLOR_BITS, 40 EGL10.EGL_NONE 41 }; 42 43 public int getStencilBits() { 44 return mStencilBits; 45 } 46 47 public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) { 48 int[] numConfig = new int[1]; 49 if (!egl.eglChooseConfig(display, mConfigSpec, null, 0, numConfig)) { 50 throw new RuntimeException("eglChooseConfig failed"); 51 } 52 53 if (numConfig[0] <= 0) { 54 throw new RuntimeException("No configs match configSpec"); 55 } 56 57 EGLConfig[] configs = new EGLConfig[numConfig[0]]; 58 if (!egl.eglChooseConfig(display, 59 mConfigSpec, configs, configs.length, numConfig)) { 60 throw new RuntimeException(); 61 } 62 63 return chooseConfig(egl, display, configs); 64 } 65 66 private EGLConfig chooseConfig( 67 EGL10 egl, EGLDisplay display, EGLConfig configs[]) { 68 69 EGLConfig result = null; 70 int minStencil = Integer.MAX_VALUE; 71 int value[] = new int[1]; 72 73 // Because we need only one bit of stencil, try to choose a config that 74 // has stencil support but with smallest number of stencil bits. If 75 // none is found, choose any one. 76 for (int i = 0, n = configs.length; i < n; ++i) { 77 if (egl.eglGetConfigAttrib( 78 display, configs[i], EGL10.EGL_STENCIL_SIZE, value)) { 79 if (value[0] == 0) continue; 80 if (value[0] < minStencil) { 81 minStencil = value[0]; 82 result = configs[i]; 83 } 84 } else { 85 throw new RuntimeException( 86 "eglGetConfigAttrib error: " + egl.eglGetError()); 87 } 88 } 89 if (result == null) result = configs[0]; 90 egl.eglGetConfigAttrib( 91 display, result, EGL10.EGL_STENCIL_SIZE, value); 92 mStencilBits = value[0]; 93 return result; 94 } 95 } 96
