1 files changed, 126 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/GalleryEGLConfigChooser.java b/src/com/android/gallery3d/ui/GalleryEGLConfigChooser.java
new file mode 100644
index 000000000..1d50d43f7
--- /dev/null
+++ b/src/com/android/gallery3d/ui/GalleryEGLConfigChooser.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.gallery3d.ui;
+
+import android.opengl.GLSurfaceView.EGLConfigChooser;
+
+import javax.microedition.khronos.egl.EGL10;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.egl.EGLDisplay;
+
+/*
+ * The code is copied/adapted from
+ * <code>android.opengl.GLSurfaceView.BaseConfigChooser</code>. Here we try to
+ * choose a configuration that support RGBA_8888 format and if possible,
+ * with stencil buffer, but is not required.
+ */
+class GalleryEGLConfigChooser implements EGLConfigChooser {
+
+    private static final String TAG = "GalleryEGLConfigChooser";
+    private int mStencilBits;
+
+    private final int mConfigSpec[] = new int[] {
+            EGL10.EGL_RED_SIZE, 5,
+            EGL10.EGL_GREEN_SIZE, 6,
+            EGL10.EGL_BLUE_SIZE, 5,
+            EGL10.EGL_ALPHA_SIZE, 0,
+            EGL10.EGL_NONE
+    };
+
+    public int getStencilBits() {
+        return mStencilBits;
+    }
+
+    public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) {
+        int[] numConfig = new int[1];
+        if (!egl.eglChooseConfig(display, mConfigSpec, null, 0, numConfig)) {
+            throw new RuntimeException("eglChooseConfig failed");
+        }
+
+        if (numConfig[0] <= 0) {
+            throw new RuntimeException("No configs match configSpec");
+        }
+
+        EGLConfig[] configs = new EGLConfig[numConfig[0]];
+        if (!egl.eglChooseConfig(display,
+                mConfigSpec, configs, configs.length, numConfig)) {
+            throw new RuntimeException();
+        }
+
+        return chooseConfig(egl, display, configs);
+    }
+
+    private EGLConfig chooseConfig(
+            EGL10 egl, EGLDisplay display, EGLConfig configs[]) {
+
+        EGLConfig result = null;
+        int minStencil = Integer.MAX_VALUE;
+        int value[] = new int[1];
+
+        // Because we need only one bit of stencil, try to choose a config that
+        // has stencil support but with smallest number of stencil bits. If
+        // none is found, choose any one.
+        for (int i = 0, n = configs.length; i < n; ++i) {
+            if (egl.eglGetConfigAttrib(
+                display, configs[i], EGL10.EGL_RED_SIZE, value)) {
+                // Filter out ARGB 8888 configs.
+                if (value[0] == 8) continue;
+            }
+            if (egl.eglGetConfigAttrib(
+                    display, configs[i], EGL10.EGL_STENCIL_SIZE, value)) {
+                if (value[0] == 0) continue;
+                if (value[0] < minStencil) {
+                    minStencil = value[0];
+                    result = configs[i];
+                }
+            } else {
+                throw new RuntimeException(
+                        "eglGetConfigAttrib error: " + egl.eglGetError());
+            }
+        }
+        if (result == null) result = configs[0];
+        egl.eglGetConfigAttrib(
+                display, result, EGL10.EGL_STENCIL_SIZE, value);
+        mStencilBits = value[0];
+        logConfig(egl, display, result);
+        return result;
+    }
+
+    private static final int[] ATTR_ID = {
+            EGL10.EGL_RED_SIZE,
+            EGL10.EGL_GREEN_SIZE,
+            EGL10.EGL_BLUE_SIZE,
+            EGL10.EGL_ALPHA_SIZE,
+            EGL10.EGL_DEPTH_SIZE,
+            EGL10.EGL_STENCIL_SIZE,
+            EGL10.EGL_CONFIG_ID,
+            EGL10.EGL_CONFIG_CAVEAT
+    };
+
+    private static final String[] ATTR_NAME = {
+        "R", "G", "B", "A", "D", "S", "ID", "CAVEAT"
+    };
+
+    private void logConfig(EGL10 egl, EGLDisplay display, EGLConfig config) {
+        int value[] = new int[1];
+        StringBuilder sb = new StringBuilder();
+        for (int j = 0; j < ATTR_ID.length; j++) {
+            egl.eglGetConfigAttrib(display, config, ATTR_ID[j], value);
+            sb.append(ATTR_NAME[j] + value[0] + " ");
+        }
+        Log.i(TAG, "Config chosen: " + sb.toString());
+    }
+}