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/*
* 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 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
};
@Override
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);
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());
}
}
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