Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2016 Peng fei Pan <sky@xiaopan.me>
 *
 * 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.opengl.GLES10;

import android.os.Build;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.egl.EGLSurface;

public class Main {
    private static int getOpenGLMaxTextureSizeBase() {
        // In JELLY_BEAN will collapse
        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN) {
            return 0;
        }

        EGL10 egl = (EGL10) EGLContext.getEGL();

        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 };
        EGLConfig[] configs = new EGLConfig[1];
        int[] numConfig = new int[1];
        egl.eglChooseConfig(dpy, configAttr, configs, 1, numConfig);
        //noinspection StatementWithEmptyBody
        if (numConfig[0] == 0) {
            // TROUBLE! No config found.
        }
        EGLConfig config = configs[0];

        int[] surfAttr = new int[] { EGL10.EGL_WIDTH, 64, EGL10.EGL_HEIGHT, 64, EGL10.EGL_NONE };
        EGLSurface surf = egl.eglCreatePbufferSurface(dpy, config, surfAttr);
        final int EGL_CONTEXT_CLIENT_VERSION = 0x3098; // missing in EGL10
        int[] ctxAttrib = { EGL_CONTEXT_CLIENT_VERSION, 1, EGL10.EGL_NONE };
        EGLContext ctx = egl.eglCreateContext(dpy, config, EGL10.EGL_NO_CONTEXT, ctxAttrib);
        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];
    }
}