src/video/uikit/SDL_uikitopengles.m
author Sam Lantinga <slouken@libsdl.org>
Tue, 01 Feb 2011 09:00:47 -0800
changeset 5132 5f09cb749d75
parent 5131 7b7da52e8775
child 5209 115fff0641ee
permissions -rw-r--r--
Added vim spacing hints
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/*
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 SDL - Simple DirectMedia Layer
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 Copyright (C) 1997-2009 Sam Lantinga
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 This library is free software; you can redistribute it and/or
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 modify it under the terms of the GNU Lesser General Public
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 License as published by the Free Software Foundation; either
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 version 2.1 of the License, or (at your option) any later version.
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 This library is distributed in the hope that it will be useful,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 Lesser General Public License for more details.
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 You should have received a copy of the GNU Lesser General Public
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 License along with this library; if not, write to the Free Software
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 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 Sam Lantinga
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 slouken@libsdl.org
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 */
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#include "SDL_uikitopengles.h"
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#include "SDL_uikitopenglview.h"
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#include "SDL_uikitappdelegate.h"
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#include "SDL_uikitwindow.h"
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#include "jumphack.h"
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#include "SDL_sysvideo.h"
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#include "../../events/SDL_keyboard_c.h"
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#include "../../events/SDL_mouse_c.h"
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#include "SDL_loadso.h"
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#include <dlfcn.h>
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static int UIKit_GL_Initialize(_THIS);
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void *
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UIKit_GL_GetProcAddress(_THIS, const char *proc)
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{    
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    /* Look through all SO's for the proc symbol.  Here's why:
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       -Looking for the path to the OpenGL Library seems not to work in the iPhone Simulator.
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       -We don't know that the path won't change in the future.
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    */
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    return SDL_LoadFunction(RTLD_DEFAULT, proc);
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}
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/*
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    note that SDL_GL_Delete context makes it current without passing the window
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*/
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int UIKit_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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    if (context) {
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        SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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        [data->view setCurrentContext];
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    }
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    else {
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        [EAGLContext setCurrentContext: nil];
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    }
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    return 0;
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}
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int
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UIKit_GL_LoadLibrary(_THIS, const char *path)
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{
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    /* 
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        shouldn't be passing a path into this function 
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        why?  Because we've already loaded the library
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        and because the SDK forbids loading an external SO
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    */
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    if (path != NULL) {
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        SDL_SetError("iPhone GL Load Library just here for compatibility");
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        return -1;
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    }
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    return 0;
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}
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extern void SDL_UIKit_UpdateBatteryMonitoring(void);
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void UIKit_GL_SwapWindow(_THIS, SDL_Window * window)
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{
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    #ifdef SDL_POWER_UIKIT
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    // Check once a frame to see if we should turn off the battery monitor.
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    SDL_UIKit_UpdateBatteryMonitoring();
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    #endif
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    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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    if (nil == data->view) {
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        return;
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    }
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    [data->view swapBuffers];
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    /* since now we've got something to draw
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       make the window visible */
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    [data->uiwindow makeKeyAndVisible];
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    /* we need to let the event cycle run, or the OS won't update the OpenGL view! */
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    SDL_PumpEvents();
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}
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SDL_GLContext UIKit_GL_CreateContext(_THIS, SDL_Window * window)
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{
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    SDL_uikitopenglview *view;
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    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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    UIScreen *uiscreen = (UIScreen *) window->display->driverdata;
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    UIWindow *uiwindow = data->uiwindow;
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    /* construct our view, passing in SDL's OpenGL configuration data */
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    view = [[SDL_uikitopenglview alloc] initWithFrame: [uiwindow bounds] \
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                                    retainBacking: _this->gl_config.retained_backing \
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                                    rBits: _this->gl_config.red_size \
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                                    gBits: _this->gl_config.green_size \
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                                    bBits: _this->gl_config.blue_size \
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                                    aBits: _this->gl_config.alpha_size \
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                                    depthBits: _this->gl_config.depth_size];
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    data->view = view;
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    /* add the view to our window */
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    [uiwindow addSubview: view ];
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    /* Don't worry, the window retained the view */
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    [view release];
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    if ( UIKit_GL_MakeCurrent(_this, window, view) < 0 ) {
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        UIKit_GL_DeleteContext(_this, view);
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        return NULL;
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    }
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    /* Make this window the current mouse focus for touch input */
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    SDL_SetMouseFocus(window);
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    SDL_SetKeyboardFocus(window);
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    return view;
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}
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void UIKit_GL_DeleteContext(_THIS, SDL_GLContext context)
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{
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    /* the delegate has retained the view, this will release him */
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    SDL_uikitopenglview *view = (SDL_uikitopenglview *)context;
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    /* this will also delete it */
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    [view removeFromSuperview];
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}
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