/*
**
** Copyright 2006, 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.
*/

#define LOG_TAG "fillrate"

#include <stdlib.h>
#include <stdio.h>

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

#include <utils/StopWatch.h>
#include <ui/FramebufferNativeWindow.h>
#include <ui/EGLUtils.h>

using namespace android;

int main(int argc, char** argv)
{
    EGLint configAttribs[] = {
         EGL_DEPTH_SIZE, 0,
         EGL_NONE
     };
     
     EGLint majorVersion;
     EGLint minorVersion;
     EGLContext context;
     EGLConfig config;
     EGLSurface surface;
     EGLint w, h;
     EGLDisplay dpy;

     dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
     eglInitialize(dpy, &majorVersion, &minorVersion);
          
     EGLNativeWindowType window = android_createDisplaySurface();
     
     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);
     context = eglCreateContext(dpy, config, NULL, NULL);
     eglMakeCurrent(dpy, surface, surface, context);   
     eglQuerySurface(dpy, surface, EGL_WIDTH, &w);
     eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
     
     printf("w=%d, h=%d\n", w, h);
     
     glDisable(GL_DITHER);
     glEnable(GL_BLEND);

     glViewport(0, 0, w, h);
     glOrthof(0, w, 0, h, 0, 1);

     eglSwapInterval(dpy, 1);

     glClearColor(1,0,0,0);
     glClear(GL_COLOR_BUFFER_BIT);
     eglSwapBuffers(dpy, surface);


     int time = 10;
     printf("screen should flash red/green quickly for %d s...\n", time);
     
     int c = 0;
     nsecs_t start = systemTime();
     nsecs_t t;
     do {
         glClearColor(1,0,0,0);
         glClear(GL_COLOR_BUFFER_BIT);
         eglSwapBuffers(dpy, surface);
         glClearColor(0,1,0,0);
         glClear(GL_COLOR_BUFFER_BIT);
         eglSwapBuffers(dpy, surface);
         t = systemTime() - start;
         c += 2;
     } while (int(ns2s(t))<=time);
     
     double p =  (double(t) / c) / 1000000000.0;
     printf("refresh-rate is %f fps (%f ms)\n", 1.0f/p, p*1000.0);
       
     eglTerminate(dpy);
     
     return 0;
}