src/video/uikit/SDL_uikitvideo.m
author Ryan C. Gordon
Sat, 01 May 2010 13:50:56 -0400
changeset 4445 06becafcac89
parent 4443 c598e440c87c
child 4446 8b03a20b320f
permissions -rw-r--r--
Test for system version in the Apple Recommended way.

(a similar test is output by Xcode for the iPhone View Application template).
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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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#import <UIKit/UIKit.h>
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_uikitvideo.h"
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#include "SDL_uikitevents.h"
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#include "SDL_uikitwindow.h"
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#include "SDL_uikitopengles.h"
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#include "SDL_renderer_sw.h"
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#include "SDL_renderer_gles.h"
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#include "SDL_assert.h"
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#define UIKITVID_DRIVER_NAME "uikit"
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/* Initialization/Query functions */
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static int UIKit_VideoInit(_THIS);
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static void UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * sdl_display);
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static int UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display,
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                                SDL_DisplayMode * mode);
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static void UIKit_VideoQuit(_THIS);
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static BOOL supports_multiple_displays = NO;
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/* DUMMY driver bootstrap functions */
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static int
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UIKit_Available(void)
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{
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	return (1);
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}
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static void UIKit_DeleteDevice(SDL_VideoDevice * device)
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{
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    SDL_free(device);
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}
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static SDL_VideoDevice *
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UIKit_CreateDevice(int devindex)
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{
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    SDL_VideoDevice *device;
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    /* Initialize all variables that we clean on shutdown */
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    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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    if (!device) {
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        SDL_OutOfMemory();
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        if (device) {
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            SDL_free(device);
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        }
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        return (0);
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    }
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    /* Set the function pointers */
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    device->VideoInit = UIKit_VideoInit;
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    device->VideoQuit = UIKit_VideoQuit;
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    device->GetDisplayModes = UIKit_GetDisplayModes;
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    device->SetDisplayMode = UIKit_SetDisplayMode;
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    device->PumpEvents = UIKit_PumpEvents;
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	device->CreateWindow = UIKit_CreateWindow;
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	device->DestroyWindow = UIKit_DestroyWindow;
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	/* OpenGL (ES) functions */
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	device->GL_MakeCurrent		= UIKit_GL_MakeCurrent;
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	device->GL_SwapWindow		= UIKit_GL_SwapWindow;
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	device->GL_CreateContext	= UIKit_GL_CreateContext;
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	device->GL_DeleteContext    = UIKit_GL_DeleteContext;
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	device->GL_GetProcAddress   = UIKit_GL_GetProcAddress;
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	device->GL_LoadLibrary	    = UIKit_GL_LoadLibrary;
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	device->free = UIKit_DeleteDevice;
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	device->gl_config.accelerated = 1;
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    return device;
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}
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VideoBootStrap UIKIT_bootstrap = {
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    UIKITVID_DRIVER_NAME, "SDL UIKit video driver",
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    UIKit_Available, UIKit_CreateDevice
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};
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/*
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!!! FIXME:
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The main screen should list a AxB mode for portrait orientation, and then
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 also list BxA for landscape mode. When setting a given resolution, we should
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 rotate the view's transform appropriately (extra credit if you check the
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 accelerometer and rotate the display so it's never upside down).
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  http://iphonedevelopment.blogspot.com/2008/10/starting-in-landscape-mode-without.html
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*/
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static void
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UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
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{
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    const UIScreen *screen = (UIScreen *) display->driverdata;
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    SDL_DisplayMode mode;
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    SDL_zero(mode);
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    // availableModes showed up in 3.2 (the iPad and later). We should only
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    //  land here for at least that version of the OS.
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    if (!supports_multiple_displays) {
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        const CGRect rect = [screen bounds];
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        mode.format = SDL_PIXELFORMAT_ABGR8888;
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        mode.w = (int) rect.size.width;
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        mode.h = (int) rect.size.height;
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        mode.refresh_rate = 0;
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        mode.driverdata = NULL;
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        SDL_AddDisplayMode(display, &mode);
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        return;
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    }
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    const NSArray *modes = [screen availableModes];
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    const NSUInteger mode_count = [modes count];
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    NSUInteger i;
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    for (i = 0; i < mode_count; i++) {
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        UIScreenMode *uimode = (UIScreenMode *) [modes objectAtIndex:i];
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        const CGSize size = [uimode size];
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        mode.format = SDL_PIXELFORMAT_ABGR8888;
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        mode.w = (int) size.width;
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        mode.h = (int) size.height;
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        mode.refresh_rate = 0;
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        mode.driverdata = uimode;
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        [uimode retain];
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        SDL_AddDisplayMode(display, &mode);
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    }
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}
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static void
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UIKit_AddDisplay(UIScreen *screen, int w, int h)
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{
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    SDL_VideoDisplay display;
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    SDL_DisplayMode mode;
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    SDL_zero(mode);
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    mode.format = SDL_PIXELFORMAT_ABGR8888;
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    mode.w = w;
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    mode.h = h;
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    mode.refresh_rate = 0;
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    SDL_zero(display);
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    display.desktop_mode = mode;
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    display.current_mode = mode;
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    display.driverdata = screen;
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    [screen retain];
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    SDL_AddVideoDisplay(&display);
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}
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int
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UIKit_VideoInit(_THIS)
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{
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    _this->gl_config.driver_loaded = 1;
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    NSString *reqSysVer = @"3.2";
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    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
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    if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
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        supports_multiple_displays = YES;
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    // If this is iPhoneOS < 3.2, all devices are one screen, 320x480 pixels.
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    //  The iPad added both a larger main screen and the ability to use
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    //  external displays.
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    if (!supports_multiple_displays) {
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        // Just give 'em the whole main screen.
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        UIScreen *screen = [UIScreen mainScreen];
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        const CGRect rect = [screen bounds];
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        UIKit_AddDisplay(screen, (int)rect.size.width, (int)rect.size.height);
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    } else {
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        const NSArray *screens = [UIScreen screens];
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        const NSUInteger screen_count = [screens count];
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        NSUInteger i;
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        for (i = 0; i < screen_count; i++) {
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            // the main screen is the first element in the array.
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            UIScreen *screen = (UIScreen *) [screens objectAtIndex:i];
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            const CGSize size = [[screen currentMode] size];
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            UIKit_AddDisplay(screen, (int) size.width, (int) size.height);
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        }
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    }
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    /* We're done! */
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    return 0;
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}
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static int
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UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
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{
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    UIScreen *screen = (UIScreen *) display->driverdata;
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    if (!supports_multiple_displays) {
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        // Not on at least iPhoneOS 3.2 (versions prior to iPad).
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        SDL_assert(mode->driverdata == NULL);
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    } else {
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        UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
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        [screen setCurrentMode:uimode];
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    }
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    return 0;
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}
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void
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UIKit_VideoQuit(_THIS)
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{
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    // Release Objective-C objects, so higher level doesn't free() them.
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    int i, j;
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    for (i = 0; i < _this->num_displays; i++) {
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        SDL_VideoDisplay *display = &_this->displays[i];
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        UIScreen *screen = (UIScreen *) display->driverdata;
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        [((UIScreen *) display->driverdata) release];
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        display->driverdata = NULL;
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        for (j = 0; j < display->num_display_modes; j++) {
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            SDL_DisplayMode *mode = &display->display_modes[j];
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            UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
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            if (uimode) {
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                [uimode release];
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                mode->driverdata = NULL;
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            }
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        }
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    }
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}
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/* vi: set ts=4 sw=4 expandtab: */