/*
 * Copyright (C) 2007 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.
 */

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

#include <EGL/egl.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>

#include <utils/Timers.h>

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

using namespace android;


static void checkEglError(const char* op, EGLBoolean returnVal = EGL_TRUE) {
    if (returnVal != EGL_TRUE) {
        fprintf(stderr, "%s() returned %d\n", op, returnVal);
    }

    for (EGLint error = eglGetError(); error != EGL_SUCCESS; error
            = eglGetError()) {
        fprintf(stderr, "after %s() eglError %s (0x%x)\n", op, EGLUtils::strerror(error),
                error);
    }
}

static void checkGlError(const char* op) {
    for (GLint error = glGetError(); error; error
            = glGetError()) {
        fprintf(stderr, "after %s() glError (0x%x)\n", op, error);
    }
}

bool doTest(uint32_t w, uint32_t h);

static EGLDisplay dpy;
static EGLSurface surface;

int main(int argc, char** argv) {
    EGLBoolean returnValue;
    EGLConfig myConfig = {0};

    EGLint context_attribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
    EGLint s_configAttribs[] = {
            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
            EGL_NONE };
    EGLint majorVersion;
    EGLint minorVersion;
    EGLContext context;
    EGLint w, h;


    checkEglError("<init>");
    dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    checkEglError("eglGetDisplay");
    if (dpy == EGL_NO_DISPLAY) {
        printf("eglGetDisplay returned EGL_NO_DISPLAY.\n");
        return 0;
    }

    returnValue = eglInitialize(dpy, &majorVersion, &minorVersion);
    checkEglError("eglInitialize", returnValue);
    if (returnValue != EGL_TRUE) {
        printf("eglInitialize failed\n");
        return 0;
    }

    EGLNativeWindowType window = android_createDisplaySurface();
    returnValue = EGLUtils::selectConfigForNativeWindow(dpy, s_configAttribs, window, &myConfig);
    if (returnValue) {
        printf("EGLUtils::selectConfigForNativeWindow() returned %d", returnValue);
        return 0;
    }

    checkEglError("EGLUtils::selectConfigForNativeWindow");

    surface = eglCreateWindowSurface(dpy, myConfig, window, NULL);
    checkEglError("eglCreateWindowSurface");
    if (surface == EGL_NO_SURFACE) {
        printf("gelCreateWindowSurface failed.\n");
        return 0;
    }

    context = eglCreateContext(dpy, myConfig, EGL_NO_CONTEXT, context_attribs);
    checkEglError("eglCreateContext");
    if (context == EGL_NO_CONTEXT) {
        printf("eglCreateContext failed\n");
        return 0;
    }
    returnValue = eglMakeCurrent(dpy, surface, surface, context);
    checkEglError("eglMakeCurrent", returnValue);
    if (returnValue != EGL_TRUE) {
        return 0;
    }
    eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
    checkEglError("eglQuerySurface");
    eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
    checkEglError("eglQuerySurface");
    GLint dim = w < h ? w : h;

    glViewport(0, 0, w, h);

    for (;;) {
        doTest(w, h);
        eglSwapBuffers(dpy, surface);
        checkEglError("eglSwapBuffers");
    }

    return 0;
}

void ptSwap() {
    eglSwapBuffers(dpy, surface);
}