opengl/tests/swapinterval/swapinterval.cpp

/*
**
** 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>

using namespace android;

int main(int argc, char** argv)
{
    EGLint configAttribs[] = {
         EGL_DEPTH_SIZE, 0,
         EGL_NONE
     };
     
     EGLint numConfigs = -1, n=0;
     EGLint majorVersion;
     EGLint minorVersion;
     EGLConfig config;
     EGLContext context;
     EGLSurface surface;
     EGLint w, h;
     
     EGLDisplay dpy;

     dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
     eglInitialize(dpy, &majorVersion, &minorVersion);
     
     // Get all the "potential match" configs...
     eglGetConfigs(dpy, NULL, 0, &numConfigs);
     EGLConfig* const configs = (EGLConfig*)malloc(sizeof(EGLConfig)*numConfigs);
     eglChooseConfig(dpy, configAttribs, configs, numConfigs, &n);
     config = configs[0];
     if (n > 1) {
         // if there is more than one candidate, go through the list
         // and pick one that matches our framebuffer format
         int fbSzA = 0; // should not hardcode
         int fbSzR = 5; // should not hardcode
         int fbSzG = 6; // should not hardcode
         int fbSzB = 5; // should not hardcode
         int i;
         for (i=0 ; i<n ; i++) {
             EGLint r,g,b,a;
             eglGetConfigAttrib(dpy, configs[i], EGL_RED_SIZE,   &r);
             eglGetConfigAttrib(dpy, configs[i], EGL_GREEN_SIZE, &g);
             eglGetConfigAttrib(dpy, configs[i], EGL_BLUE_SIZE,  &b);
             eglGetConfigAttrib(dpy, configs[i], EGL_ALPHA_SIZE, &a);
             if (fbSzA == a && fbSzR == r && fbSzG == g && fbSzB  == b) {
                 config = configs[i];
                 break;
             }
         }
     }
     free(configs);
     
     surface = eglCreateWindowSurface(dpy, config,
             android_createDisplaySurface(), 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;
}