view src/video/android/SDL_androidwindow.c @ 5053:b5b42be9333c

Fixed bug #1026 Vittorio Giovara 2010-07-16 19:09:28 PDT i was reading SDL_renderer_gles and i noticed that every time we there is some gl call the gl state is modified with a couple of glEnableClientState()/glDisableClientState. While this is completely fine for desktops systems, this is a major performace kill on mobile devices, right where opengles is implemented. Normal practice in this case is to update the glstate once, keep it always the same and disable/enable other states only in very special occasions. On the web there's plenty of documentation (on the top of my head http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5 ) and i personally tried this. I modified my code and got a 10 fps boost, then modified SDL_render_gles and shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i got an 80% performance increase with this technique. I have attached a dif of my changes, hope that it will be included in mainstream.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 19 Jan 2011 23:56:16 -0800
parents 77df56570442
children c66b2a778b7e
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of 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.

    This library 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 GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "../SDL_sysvideo.h"

#include "SDL_androidvideo.h"
#include "SDL_androidwindow.h"

int
Android_CreateWindow(_THIS, SDL_Window * window)
{
    if (Android_Window) {
        SDL_SetError("Android only supports one window");
        return -1;
    }
    Android_Window = window;

    /* Adjust the window data to match the screen */
    window->x = 0;
    window->y = 0;
    window->w = Android_ScreenWidth;
    window->h = Android_ScreenHeight;

    return 0;
}

void
Android_SetWindowTitle(_THIS, SDL_Window * window)
{
    Android_JNI_SetActivityTitle(window->title);
}

void
Android_DestroyWindow(_THIS, SDL_Window * window)
{
    if (window == Android_Window) {
        Android_Window = NULL;
    }
}

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