src/video/uikit/SDL_uikitvideo.m
author Kees Bakker
Wed, 28 Sep 2011 21:13:09 +0200
changeset 6009 fb5fa3561ca9
parent 6007 0e647f56751d
child 6013 b253cc3c4276
permissions -rw-r--r--
Simplied the code a bit in uikit/SDL_uikitvideo.m
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 
    22 #import <UIKit/UIKit.h>
    23 
    24 #include "SDL_config.h"
    25 
    26 #include "SDL_video.h"
    27 #include "SDL_mouse.h"
    28 #include "../SDL_sysvideo.h"
    29 #include "../SDL_pixels_c.h"
    30 #include "../../events/SDL_events_c.h"
    31 
    32 #include "SDL_uikitvideo.h"
    33 #include "SDL_uikitevents.h"
    34 #include "SDL_uikitwindow.h"
    35 #include "SDL_uikitopengles.h"
    36 
    37 #include "SDL_assert.h"
    38 
    39 #define UIKITVID_DRIVER_NAME "uikit"
    40 
    41 /* Initialization/Query functions */
    42 static int UIKit_VideoInit(_THIS);
    43 static void UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * sdl_display);
    44 static int UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display,
    45                                 SDL_DisplayMode * mode);
    46 static void UIKit_VideoQuit(_THIS);
    47 
    48 BOOL SDL_UIKit_supports_multiple_displays = NO;
    49 
    50 /* DUMMY driver bootstrap functions */
    51 
    52 static int
    53 UIKit_Available(void)
    54 {
    55     return 1;
    56 }
    57 
    58 static void UIKit_DeleteDevice(SDL_VideoDevice * device)
    59 {
    60     SDL_free(device);
    61 }
    62 
    63 static SDL_VideoDevice *
    64 UIKit_CreateDevice(int devindex)
    65 {
    66     SDL_VideoDevice *device;
    67 
    68     /* Initialize all variables that we clean on shutdown */
    69     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
    70     if (!device) {
    71         SDL_OutOfMemory();
    72         if (device) {
    73             SDL_free(device);
    74         }
    75         return (0);
    76     }
    77 
    78     /* Set the function pointers */
    79     device->VideoInit = UIKit_VideoInit;
    80     device->VideoQuit = UIKit_VideoQuit;
    81     device->GetDisplayModes = UIKit_GetDisplayModes;
    82     device->SetDisplayMode = UIKit_SetDisplayMode;
    83     device->PumpEvents = UIKit_PumpEvents;
    84     device->CreateWindow = UIKit_CreateWindow;
    85     device->DestroyWindow = UIKit_DestroyWindow;
    86     device->GetWindowWMInfo = UIKit_GetWindowWMInfo;
    87 
    88 
    89     /* OpenGL (ES) functions */
    90     device->GL_MakeCurrent        = UIKit_GL_MakeCurrent;
    91     device->GL_SwapWindow        = UIKit_GL_SwapWindow;
    92     device->GL_CreateContext    = UIKit_GL_CreateContext;
    93     device->GL_DeleteContext    = UIKit_GL_DeleteContext;
    94     device->GL_GetProcAddress   = UIKit_GL_GetProcAddress;
    95     device->GL_LoadLibrary        = UIKit_GL_LoadLibrary;
    96     device->free = UIKit_DeleteDevice;
    97 
    98     device->gl_config.accelerated = 1;
    99 
   100     return device;
   101 }
   102 
   103 VideoBootStrap UIKIT_bootstrap = {
   104     UIKITVID_DRIVER_NAME, "SDL UIKit video driver",
   105     UIKit_Available, UIKit_CreateDevice
   106 };
   107 
   108 
   109 /*
   110 !!! FIXME:
   111 
   112 The main screen should list a AxB mode for portrait orientation, and then
   113  also list BxA for landscape mode. When setting a given resolution, we should
   114  rotate the view's transform appropriately (extra credit if you check the
   115  accelerometer and rotate the display so it's never upside down).
   116 
   117   http://iphonedevelopment.blogspot.com/2008/10/starting-in-landscape-mode-without.html
   118 
   119 */
   120 
   121 static void
   122 UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
   123 {
   124     UIScreen *uiscreen = (UIScreen *) display->driverdata;
   125     SDL_DisplayMode mode;
   126     SDL_zero(mode);
   127 
   128     // availableModes showed up in 3.2 (the iPad and later). We should only
   129     //  land here for at least that version of the OS.
   130     if (!SDL_UIKit_supports_multiple_displays) {
   131         const CGRect rect = [uiscreen bounds];
   132         mode.format = SDL_PIXELFORMAT_ABGR8888;
   133         mode.refresh_rate = 0;
   134         mode.driverdata = NULL;
   135 
   136         mode.w = (int) rect.size.width;
   137         mode.h = (int) rect.size.height;
   138         SDL_AddDisplayMode(display, &mode);
   139 
   140         mode.w = (int) rect.size.height;  // swap the orientation, add again.
   141         mode.h = (int) rect.size.width;
   142         SDL_AddDisplayMode(display, &mode);
   143         return;
   144     }
   145 
   146     const NSArray *modes = [uiscreen availableModes];
   147     for (UIScreenMode *uimode in [uiscreen availableModes]) {
   148         CGSize size = [uimode size];
   149         mode.format = SDL_PIXELFORMAT_ABGR8888;
   150         mode.refresh_rate = 0;
   151         mode.driverdata = uimode;
   152         mode.w = (int) size.width;
   153         mode.h = (int) size.height;
   154         if (SDL_AddDisplayMode(display, &mode))
   155             [uimode retain];        // retain is needed because of mode.driverdata
   156 
   157         if (uiscreen == [UIScreen mainScreen]) {
   158             // Add the mode with swapped width/height
   159             mode.w = (int) size.height;
   160             mode.h = (int) size.width;
   161             if (SDL_AddDisplayMode(display, &mode))
   162                 [uimode retain];
   163         }
   164     }
   165 }
   166 
   167 
   168 static void
   169 UIKit_AddDisplay(UIScreen *uiscreen, UIScreenMode *uimode, int w, int h)
   170 {
   171     SDL_VideoDisplay display;
   172     SDL_DisplayMode mode;
   173     SDL_zero(mode);
   174     mode.format = SDL_PIXELFORMAT_ABGR8888;
   175     mode.w = w;
   176     mode.h = h;
   177     mode.refresh_rate = 0;
   178 
   179     [uimode retain];
   180     mode.driverdata = uimode;
   181 
   182     SDL_zero(display);
   183     display.desktop_mode = mode;
   184     display.current_mode = mode;
   185 
   186     [uiscreen retain];
   187     display.driverdata = uiscreen;
   188     SDL_AddVideoDisplay(&display);
   189 }
   190 
   191 
   192 int
   193 UIKit_VideoInit(_THIS)
   194 {
   195     _this->gl_config.driver_loaded = 1;
   196 
   197     NSString *reqSysVer = @"3.2";
   198     NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
   199     if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
   200         SDL_UIKit_supports_multiple_displays = YES;
   201 
   202     // If this is iPhoneOS < 3.2, all devices are one screen, 320x480 pixels.
   203     //  The iPad added both a larger main screen and the ability to use
   204     //  external displays.
   205     if (!SDL_UIKit_supports_multiple_displays) {
   206         // Just give 'em the whole main screen.
   207         UIScreen *uiscreen = [UIScreen mainScreen];
   208         UIScreenMode *uiscreenmode = [uiscreen currentMode];
   209         const CGSize size = [uiscreen bounds].size;
   210         UIKit_AddDisplay(uiscreen, uiscreenmode, (int)size.width, (int)size.height);
   211     } else {
   212         for (UIScreen *uiscreen in [UIScreen screens]) {
   213             // the main screen is the first element in the array.
   214             UIScreenMode *uiscreenmode = [uiscreen currentMode];
   215             const CGSize size = [[uiscreen currentMode] size];
   216             UIKit_AddDisplay(uiscreen, uiscreenmode, (int)size.width, (int)size.height);
   217         }
   218     }
   219 
   220     /* We're done! */
   221     return 0;
   222 }
   223 
   224 static int
   225 UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   226 {
   227     UIScreen *uiscreen = (UIScreen *) display->driverdata;
   228     if (!SDL_UIKit_supports_multiple_displays) {
   229         // Not on at least iPhoneOS 3.2 (versions prior to iPad).
   230         SDL_assert(mode->driverdata == NULL);
   231     } else {
   232         UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   233         [uiscreen setCurrentMode:uimode];
   234     }
   235 
   236     return 0;
   237 }
   238 
   239 void
   240 UIKit_VideoQuit(_THIS)
   241 {
   242     // Release Objective-C objects, so higher level doesn't free() them.
   243     int i, j;
   244     for (i = 0; i < _this->num_displays; i++) {
   245         SDL_VideoDisplay *display = &_this->displays[i];
   246         UIScreen *uiscreen = (UIScreen *) display->driverdata;
   247         [uiscreen release];
   248         display->driverdata = NULL;
   249         for (j = 0; j < display->num_display_modes; j++) {
   250             SDL_DisplayMode *mode = &display->display_modes[j];
   251             UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   252             if (uimode) {
   253                 [uimode release];
   254                 mode->driverdata = NULL;
   255             }
   256         }
   257     }
   258 }
   259 
   260 /* vi: set ts=4 sw=4 expandtab: */