83 lines
3.5 KiB
Java
83 lines
3.5 KiB
Java
/*
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* Copyright 2019 Gustl22
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* Copyright 2019 devemux86
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
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* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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package org.oscim.android.gl;
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import android.opengl.GLSurfaceView;
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import org.oscim.android.MapView;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.microedition.khronos.egl.EGL10;
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import javax.microedition.khronos.egl.EGLConfig;
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import javax.microedition.khronos.egl.EGLContext;
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import javax.microedition.khronos.egl.EGLDisplay;
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/**
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* https://developer.android.com/guide/topics/graphics/opengl.html#version-check
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* <p>
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* https://github.com/libgdx/libgdx/blob/master/backends/gdx-backend-android/src/com/badlogic/gdx/backends/android/surfaceview/GLSurfaceView20.java
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*/
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public class GlContextFactory implements GLSurfaceView.EGLContextFactory {
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private static final Logger log = LoggerFactory.getLogger(GlContextFactory.class);
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private static final int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
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@Override
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public EGLContext createContext(EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
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log.info("creating OpenGL ES " + MapView.OPENGL_VERSION + " context");
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checkEglError("Before eglCreateContext " + MapView.OPENGL_VERSION, egl);
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int[] attrib_list = {EGL_CONTEXT_CLIENT_VERSION, (int) MapView.OPENGL_VERSION, EGL10.EGL_NONE};
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EGLContext context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list);
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boolean success = checkEglError("After eglCreateContext " + MapView.OPENGL_VERSION, egl);
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if ((!success || context == null) && MapView.OPENGL_VERSION > 2) {
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log.warn("Falling back to GLES 2");
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MapView.OPENGL_VERSION = 2.0;
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return createContext(egl, display, eglConfig);
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}
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log.info("Returning a GLES " + MapView.OPENGL_VERSION + " context");
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return context;
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}
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@Override
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public void destroyContext(EGL10 egl, EGLDisplay display, EGLContext context) {
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egl.eglDestroyContext(display, context);
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}
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private static boolean checkEglError(String prompt, EGL10 egl) {
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int error;
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boolean result = true;
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while ((error = egl.eglGetError()) != EGL10.EGL_SUCCESS) {
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result = false;
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log.error(String.format("%s: EGL error: 0x%x", prompt, error));
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}
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return result;
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}
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}
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