Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 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.gallery3d.ui; |
| 17 | |
| 18 | import android.opengl.GLSurfaceView.EGLConfigChooser; |
| 19 | |
| 20 | import javax.microedition.khronos.egl.EGL10; |
| 21 | import javax.microedition.khronos.egl.EGLConfig; |
| 22 | import javax.microedition.khronos.egl.EGLDisplay; |
| 23 | |
| 24 | /* |
| 25 | * The code is copied/adapted from |
| 26 | * <code>android.opengl.GLSurfaceView.BaseConfigChooser</code>. Here we try to |
| 27 | * choose a configuration that support RGBA_8888 format and if possible, |
| 28 | * with stencil buffer, but is not required. |
| 29 | */ |
| 30 | class GalleryEGLConfigChooser implements EGLConfigChooser { |
| 31 | |
| 32 | private static final String TAG = "GalleryEGLConfigChooser"; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 33 | |
| 34 | private final int mConfigSpec[] = new int[] { |
| 35 | EGL10.EGL_RED_SIZE, 5, |
| 36 | EGL10.EGL_GREEN_SIZE, 6, |
| 37 | EGL10.EGL_BLUE_SIZE, 5, |
| 38 | EGL10.EGL_ALPHA_SIZE, 0, |
| 39 | EGL10.EGL_NONE |
| 40 | }; |
| 41 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 42 | public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) { |
| 43 | int[] numConfig = new int[1]; |
| 44 | if (!egl.eglChooseConfig(display, mConfigSpec, null, 0, numConfig)) { |
| 45 | throw new RuntimeException("eglChooseConfig failed"); |
| 46 | } |
| 47 | |
| 48 | if (numConfig[0] <= 0) { |
| 49 | throw new RuntimeException("No configs match configSpec"); |
| 50 | } |
| 51 | |
| 52 | EGLConfig[] configs = new EGLConfig[numConfig[0]]; |
| 53 | if (!egl.eglChooseConfig(display, |
| 54 | mConfigSpec, configs, configs.length, numConfig)) { |
| 55 | throw new RuntimeException(); |
| 56 | } |
| 57 | |
| 58 | return chooseConfig(egl, display, configs); |
| 59 | } |
| 60 | |
| 61 | private EGLConfig chooseConfig( |
| 62 | EGL10 egl, EGLDisplay display, EGLConfig configs[]) { |
| 63 | |
| 64 | EGLConfig result = null; |
| 65 | int minStencil = Integer.MAX_VALUE; |
| 66 | int value[] = new int[1]; |
| 67 | |
| 68 | // Because we need only one bit of stencil, try to choose a config that |
| 69 | // has stencil support but with smallest number of stencil bits. If |
| 70 | // none is found, choose any one. |
| 71 | for (int i = 0, n = configs.length; i < n; ++i) { |
| 72 | if (egl.eglGetConfigAttrib( |
| 73 | display, configs[i], EGL10.EGL_RED_SIZE, value)) { |
| 74 | // Filter out ARGB 8888 configs. |
| 75 | if (value[0] == 8) continue; |
| 76 | } |
| 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); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 92 | logConfig(egl, display, result); |
| 93 | return result; |
| 94 | } |
| 95 | |
| 96 | private static final int[] ATTR_ID = { |
| 97 | EGL10.EGL_RED_SIZE, |
| 98 | EGL10.EGL_GREEN_SIZE, |
| 99 | EGL10.EGL_BLUE_SIZE, |
| 100 | EGL10.EGL_ALPHA_SIZE, |
| 101 | EGL10.EGL_DEPTH_SIZE, |
| 102 | EGL10.EGL_STENCIL_SIZE, |
| 103 | EGL10.EGL_CONFIG_ID, |
| 104 | EGL10.EGL_CONFIG_CAVEAT |
| 105 | }; |
| 106 | |
| 107 | private static final String[] ATTR_NAME = { |
| 108 | "R", "G", "B", "A", "D", "S", "ID", "CAVEAT" |
| 109 | }; |
| 110 | |
| 111 | private void logConfig(EGL10 egl, EGLDisplay display, EGLConfig config) { |
| 112 | int value[] = new int[1]; |
| 113 | StringBuilder sb = new StringBuilder(); |
| 114 | for (int j = 0; j < ATTR_ID.length; j++) { |
| 115 | egl.eglGetConfigAttrib(display, config, ATTR_ID[j], value); |
| 116 | sb.append(ATTR_NAME[j] + value[0] + " "); |
| 117 | } |
| 118 | Log.i(TAG, "Config chosen: " + sb.toString()); |
| 119 | } |
| 120 | } |