/* San Angeles Observation OpenGL ES version example
 * Copyright 2004-2005 Jetro Lauha
 * All rights reserved.
 * Web: http://iki.fi/jetro/
 *
 * This source is free software; you can redistribute it and/or
 * modify it under the terms of EITHER:
 *   (1) The GNU Lesser General Public License as published by the Free
 *       Software Foundation; either version 2.1 of the License, or (at
 *       your option) any later version. The text of the GNU Lesser
 *       General Public License is included with this source in the
 *       file LICENSE-LGPL.txt.
 *   (2) The BSD-style license that is included with this source in
 *       the file LICENSE-BSD.txt.
 *
 * This source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files
 * LICENSE-LGPL.txt and LICENSE-BSD.txt for more details.
 *
 * $Id: app-linux.c,v 1.4 2005/02/08 18:42:48 tonic Exp $
 * $Revision: 1.4 $
 *
 * Parts of this source file is based on test/example code from
 * GLESonGL implementation by David Blythe. Here is copy of the
 * license notice from that source:
 *
 * Copyright (C) 2003  David Blythe   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * DAVID BLYTHE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>

#include <EGL/egl.h>
#include <GLES/gl.h>

#include <ui/FramebufferNativeWindow.h>
#include "EGLUtils.h"

using namespace android;

#include "app.h"


int gAppAlive = 1;

static const char sAppName[] =
        "San Angeles Observation OpenGL ES version example (Linux)";

static int sWindowWidth = WINDOW_DEFAULT_WIDTH;
static int sWindowHeight = WINDOW_DEFAULT_HEIGHT;
static EGLDisplay sEglDisplay = EGL_NO_DISPLAY;
static EGLContext sEglContext = EGL_NO_CONTEXT;
static EGLSurface sEglSurface = EGL_NO_SURFACE;

const char *egl_strerror(unsigned err)
{
    switch(err){
        case EGL_SUCCESS: return "SUCCESS";
        case EGL_NOT_INITIALIZED: return "NOT INITIALIZED";
        case EGL_BAD_ACCESS: return "BAD ACCESS";
        case EGL_BAD_ALLOC: return "BAD ALLOC";
        case EGL_BAD_ATTRIBUTE: return "BAD_ATTRIBUTE";
        case EGL_BAD_CONFIG: return "BAD CONFIG";
        case EGL_BAD_CONTEXT: return "BAD CONTEXT";
        case EGL_BAD_CURRENT_SURFACE: return "BAD CURRENT SURFACE";
        case EGL_BAD_DISPLAY: return "BAD DISPLAY";
        case EGL_BAD_MATCH: return "BAD MATCH";
        case EGL_BAD_NATIVE_PIXMAP: return "BAD NATIVE PIXMAP";
        case EGL_BAD_NATIVE_WINDOW: return "BAD NATIVE WINDOW";
        case EGL_BAD_PARAMETER: return "BAD PARAMETER";
        case EGL_BAD_SURFACE: return "BAD_SURFACE";
        //    case EGL_CONTEXT_LOST: return "CONTEXT LOST";
        default: return "UNKNOWN";
    }
}

void egl_error(const char *name)
{
    unsigned err = eglGetError();
    if(err != EGL_SUCCESS) {
        fprintf(stderr,"%s(): egl error 0x%x (%s)\n", 
                name, err, egl_strerror(err));
    }
}

static void checkGLErrors()
{
    GLenum error = glGetError();
    if (error != GL_NO_ERROR)
        fprintf(stderr, "GL Error: 0x%04x\n", (int)error);
}


static void checkEGLErrors()
{
    EGLint error = eglGetError();
    // GLESonGL seems to be returning 0 when there is no errors?
    if (error && error != EGL_SUCCESS)
        fprintf(stderr, "EGL Error: 0x%04x\n", (int)error);
}

static int initGraphics(unsigned samples)
{
    EGLint configAttribs[] = {
            EGL_DEPTH_SIZE, 16,
            EGL_SAMPLE_BUFFERS, samples ? 1 : 0,
                    EGL_SAMPLES, samples,
                    EGL_NONE
    };

    EGLint majorVersion;
    EGLint minorVersion;
    EGLContext context;
    EGLConfig config;
    EGLSurface surface;
    EGLint w, h;
    EGLDisplay dpy;

    EGLNativeWindowType window = android_createDisplaySurface();

    dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    eglInitialize(dpy, &majorVersion, &minorVersion);

    status_t err = EGLUtils::selectConfigForNativeWindow(
            dpy, configAttribs, window, &config);
    if (err) {
        fprintf(stderr, "couldn't find an EGLConfig matching the screen format\n");
        return 0;
    }

    surface = eglCreateWindowSurface(dpy, config, window, NULL);
    egl_error("eglCreateWindowSurface");

    fprintf(stderr,"surface = %p\n", surface);

    context = eglCreateContext(dpy, config, NULL, NULL);
    egl_error("eglCreateContext");
    fprintf(stderr,"context = %p\n", context);

    eglMakeCurrent(dpy, surface, surface, context);
    egl_error("eglMakeCurrent");

    eglQuerySurface(dpy, surface, EGL_WIDTH, &sWindowWidth);
    eglQuerySurface(dpy, surface, EGL_HEIGHT, &sWindowHeight);

    sEglDisplay = dpy;
    sEglSurface = surface;
    sEglContext = context;

    if (samples == 0) {
        // GL_MULTISAMPLE is enabled by default
        glDisable(GL_MULTISAMPLE);
    }

    return EGL_TRUE;
}


static void deinitGraphics()
{
    eglMakeCurrent(sEglDisplay, NULL, NULL, NULL);
    eglDestroyContext(sEglDisplay, sEglContext);
    eglDestroySurface(sEglDisplay, sEglSurface);
    eglTerminate(sEglDisplay);
}


int main(int argc, char *argv[])
{
    unsigned samples = 0;
    printf("usage: %s [samples]\n", argv[0]);
    if (argc == 2) {
        samples = atoi( argv[1] );
        printf("Multisample enabled: GL_SAMPLES = %u\n", samples);
    }

    if (!initGraphics(samples))
    {
        fprintf(stderr, "Graphics initialization failed.\n");
        return EXIT_FAILURE;
    }

    appInit();

    struct timeval timeTemp;
    int frameCount = 0;
    gettimeofday(&timeTemp, NULL);
    double totalTime = timeTemp.tv_usec/1000000.0 + timeTemp.tv_sec;

    while (gAppAlive)
    {
        struct timeval timeNow;

        gettimeofday(&timeNow, NULL);
        appRender(timeNow.tv_sec * 1000 + timeNow.tv_usec / 1000,
                sWindowWidth, sWindowHeight);
        checkGLErrors();
        eglSwapBuffers(sEglDisplay, sEglSurface);
        checkEGLErrors();
        frameCount++;
    }

    gettimeofday(&timeTemp, NULL);

    appDeinit();
    deinitGraphics();

    totalTime = (timeTemp.tv_usec/1000000.0 + timeTemp.tv_sec) - totalTime;
    printf("totalTime=%f s, frameCount=%d, %.2f fps\n",
            totalTime, frameCount, frameCount/totalTime);

    return EXIT_SUCCESS;
}