Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright  Yan Zhenjie
 *
 * 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.
 */

import android.annotation.TargetApi;
import android.opengl.EGL14;
import android.opengl.EGLConfig;
import android.opengl.EGLContext;
import android.opengl.EGLDisplay;
import android.opengl.EGLSurface;
import android.opengl.GLES10;
import android.opengl.GLES20;
import android.os.Build;
import android.util.Log;
import javax.microedition.khronos.egl.EGL10;

public class Main {
    private static final String TAG = "EglUtils";

    public static int getMaxTextureSize() {
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                return getMaxTextureEgl14();
            } else {
                return getMaxTextureEgl10();
            }
        } catch (Exception e) {
            Log.d(TAG, "getMaxTextureSize: ", e);
            return 0;
        }
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
    private static int getMaxTextureEgl14() {
        EGLDisplay dpy = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
        int[] vers = new int[2];
        EGL14.eglInitialize(dpy, vers, 0, vers, 1);

        int[] configAttr = { EGL14.EGL_COLOR_BUFFER_TYPE, EGL14.EGL_RGB_BUFFER, EGL14.EGL_LEVEL, 0,
                EGL14.EGL_RENDERABLE_TYPE, EGL14.EGL_OPENGL_ES2_BIT, EGL14.EGL_SURFACE_TYPE, EGL14.EGL_PBUFFER_BIT,
                EGL14.EGL_NONE };
        EGLConfig[] configs = new EGLConfig[1];
        int[] numConfig = new int[1];
        EGL14.eglChooseConfig(dpy, configAttr, 0, configs, 0, 1, numConfig, 0);
        if (numConfig[0] == 0) {
            return 0;
        }
        EGLConfig config = configs[0];

        int[] surfAttr = { EGL14.EGL_WIDTH, 64, EGL14.EGL_HEIGHT, 64, EGL14.EGL_NONE };
        EGLSurface surf = EGL14.eglCreatePbufferSurface(dpy, config, surfAttr, 0);

        int[] ctxAttribute = { EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE };
        EGLContext ctx = EGL14.eglCreateContext(dpy, config, EGL14.EGL_NO_CONTEXT, ctxAttribute, 0);

        EGL14.eglMakeCurrent(dpy, surf, surf, ctx);

        int[] maxSize = new int[1];
        GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_SIZE, maxSize, 0);

        EGL14.eglMakeCurrent(dpy, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_SURFACE, EGL14.EGL_NO_CONTEXT);
        EGL14.eglDestroySurface(dpy, surf);
        EGL14.eglDestroyContext(dpy, ctx);
        EGL14.eglTerminate(dpy);

        return maxSize[0];
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    private static int getMaxTextureEgl10() {
        EGL10 egl = (EGL10) javax.microedition.khronos.egl.EGLContext.getEGL();

        javax.microedition.khronos.egl.EGLDisplay dpy = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
        int[] vers = new int[2];
        egl.eglInitialize(dpy, vers);

        int[] configAttr = { EGL10.EGL_COLOR_BUFFER_TYPE, EGL10.EGL_RGB_BUFFER, EGL10.EGL_LEVEL, 0,
                EGL10.EGL_SURFACE_TYPE, EGL10.EGL_PBUFFER_BIT, EGL10.EGL_NONE };
        javax.microedition.khronos.egl.EGLConfig[] configs = new javax.microedition.khronos.egl.EGLConfig[1];
        int[] numConfig = new int[1];
        egl.eglChooseConfig(dpy, configAttr, configs, 1, numConfig);
        if (numConfig[0] == 0) {
            return 0;
        }
        javax.microedition.khronos.egl.EGLConfig config = configs[0];

        int[] surfAttr = { EGL10.EGL_WIDTH, 64, EGL10.EGL_HEIGHT, 64, EGL10.EGL_NONE };
        javax.microedition.khronos.egl.EGLSurface surf = egl.eglCreatePbufferSurface(dpy, config, surfAttr);
        final int EGL_CONTEXT_CLIENT_VERSION = 0x3098; // missing in EGL10
        int[] ctxAttribute = { EGL_CONTEXT_CLIENT_VERSION, 1, EGL10.EGL_NONE };
        javax.microedition.khronos.egl.EGLContext ctx = egl.eglCreateContext(dpy, config, EGL10.EGL_NO_CONTEXT,
                ctxAttribute);
        egl.eglMakeCurrent(dpy, surf, surf, ctx);
        int[] maxSize = new int[1];
        GLES10.glGetIntegerv(GLES10.GL_MAX_TEXTURE_SIZE, maxSize, 0);
        egl.eglMakeCurrent(dpy, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
        egl.eglDestroySurface(dpy, surf);
        egl.eglDestroyContext(dpy, ctx);
        egl.eglTerminate(dpy);

        return maxSize[0];
    }
}