src/video/uikit/SDL_uikitvideo.m
author Ryan C. Gordon
Tue, 05 Jul 2011 22:05:56 -0400
changeset 5558 dd0f52bf2bfa
parent 5535 96594ac5fd1a
child 5997 69875bbf83d8
child 6001 3ae3d1e58d59
permissions -rw-r--r--
Properly set up default resolutions.

Fixes Bugzilla #1191.

Thanks to Jeremy Jurksztowicz for the fix!
     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 CGSize
   122 UIKit_ForcePortrait(const CGSize size)
   123 {
   124     CGSize retval;
   125     if (size.width < size.height) { // portrait
   126         retval = size;
   127     } else {  // landscape
   128         retval.width = size.height;
   129         retval.height = size.width;
   130     }
   131     return retval;
   132 }
   133 
   134 static CGSize
   135 UIKit_ForceLandscape(const CGSize size)
   136 {
   137     CGSize retval;
   138     if (size.width > size.height) { // landscape
   139         retval = size;
   140     } else {  // portrait
   141         retval.width = size.height;
   142         retval.height = size.width;
   143     }
   144     return retval;
   145 }
   146 
   147 static void
   148 UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
   149 {
   150     UIScreen *uiscreen = (UIScreen *) display->driverdata;
   151     SDL_DisplayMode mode;
   152     SDL_zero(mode);
   153 
   154     // availableModes showed up in 3.2 (the iPad and later). We should only
   155     //  land here for at least that version of the OS.
   156     if (!SDL_UIKit_supports_multiple_displays) {
   157         const CGRect rect = [uiscreen bounds];
   158         mode.format = SDL_PIXELFORMAT_ABGR8888;
   159         mode.w = (int) rect.size.width;
   160         mode.h = (int) rect.size.height;
   161         mode.refresh_rate = 0;
   162         mode.driverdata = NULL;
   163         SDL_AddDisplayMode(display, &mode);
   164         mode.w = (int) rect.size.height;  // swap the orientation, add again.
   165         mode.h = (int) rect.size.width;
   166         SDL_AddDisplayMode(display, &mode);
   167         return;
   168     }
   169 
   170     const int ismain = (uiscreen == [UIScreen mainScreen]);
   171     const NSArray *modes = [uiscreen availableModes];
   172     const NSUInteger mode_count = [modes count];
   173     NSUInteger i;
   174     for (i = 0; i < mode_count; i++) {
   175         UIScreenMode *uimode = (UIScreenMode *) [modes objectAtIndex:i];
   176         CGSize size = [uimode size];
   177         mode.format = SDL_PIXELFORMAT_ABGR8888;
   178         mode.refresh_rate = 0;
   179         mode.driverdata = uimode;
   180         mode.w = (int) size.width;
   181         mode.h = (int) size.height;
   182         if (SDL_AddDisplayMode(display, &mode))
   183             [uimode retain];
   184 
   185         if (ismain) {
   186             // Add the mode twice, flipped to portrait and landscape.
   187             //  SDL_AddDisplayMode() will ignore duplicates.
   188             size = UIKit_ForcePortrait([uimode size]);
   189             mode.w = (int) size.width;
   190             mode.h = (int) size.height;
   191             if (SDL_AddDisplayMode(display, &mode))
   192                 [uimode retain];
   193 
   194             size = UIKit_ForceLandscape(size);
   195             mode.w = (int) size.width;
   196             mode.h = (int) size.height;
   197             if (SDL_AddDisplayMode(display, &mode))
   198                 [uimode retain];
   199         }
   200     }
   201 }
   202 
   203 
   204 static void
   205 UIKit_AddDisplay(UIScreen *uiscreen, UIScreenMode *uimode, int w, int h)
   206 {
   207     SDL_VideoDisplay display;
   208     SDL_DisplayMode mode;
   209     SDL_zero(mode);
   210     mode.format = SDL_PIXELFORMAT_ABGR8888;
   211     mode.w = w;
   212     mode.h = h;
   213     mode.refresh_rate = 0;
   214     
   215     [uimode retain];
   216     mode.driverdata = uimode;
   217 
   218     SDL_zero(display);
   219     display.desktop_mode = mode;
   220     display.current_mode = mode;
   221 
   222     [uiscreen retain];
   223     display.driverdata = uiscreen;
   224     SDL_AddVideoDisplay(&display);
   225 }
   226 
   227 
   228 int
   229 UIKit_VideoInit(_THIS)
   230 {
   231     _this->gl_config.driver_loaded = 1;
   232 
   233     NSString *reqSysVer = @"3.2";
   234     NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
   235     if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
   236         SDL_UIKit_supports_multiple_displays = YES;
   237 
   238     // If this is iPhoneOS < 3.2, all devices are one screen, 320x480 pixels.
   239     //  The iPad added both a larger main screen and the ability to use
   240     //  external displays.
   241     if (!SDL_UIKit_supports_multiple_displays) {
   242         // Just give 'em the whole main screen.
   243         UIScreen *uiscreen = [UIScreen mainScreen];
   244         UIScreenMode *uiscreenmode = [uiscreen currentMode];
   245         const CGRect rect = [uiscreen bounds];
   246         UIKit_AddDisplay(uiscreen, uiscreenmode, (int)rect.size.width, (int)rect.size.height);
   247     } else {
   248         const NSArray *screens = [UIScreen screens];
   249         const NSUInteger screen_count = [screens count];
   250         NSUInteger i;
   251         for (i = 0; i < screen_count; i++) {
   252             // the main screen is the first element in the array.
   253             UIScreen *uiscreen = (UIScreen *) [screens objectAtIndex:i];
   254             UIScreenMode *uiscreenmode = [uiscreen currentMode];
   255             const CGSize size = [[uiscreen currentMode] size];
   256             UIKit_AddDisplay(uiscreen, uiscreenmode, (int)size.width, (int)size.height);
   257         }
   258     }
   259 
   260     /* We're done! */
   261     return 0;
   262 }
   263 
   264 static int
   265 UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   266 {
   267     UIScreen *uiscreen = (UIScreen *) display->driverdata;
   268     if (!SDL_UIKit_supports_multiple_displays) {
   269         // Not on at least iPhoneOS 3.2 (versions prior to iPad).
   270         SDL_assert(mode->driverdata == NULL);
   271     } else {
   272         UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   273         [uiscreen setCurrentMode:uimode];
   274     }
   275 
   276     return 0;
   277 }
   278 
   279 void
   280 UIKit_VideoQuit(_THIS)
   281 {
   282     // Release Objective-C objects, so higher level doesn't free() them.
   283     int i, j;
   284     for (i = 0; i < _this->num_displays; i++) {
   285         SDL_VideoDisplay *display = &_this->displays[i];
   286         UIScreen *uiscreen = (UIScreen *) display->driverdata;
   287         [uiscreen release];
   288         display->driverdata = NULL;
   289         for (j = 0; j < display->num_display_modes; j++) {
   290             SDL_DisplayMode *mode = &display->display_modes[j];
   291             UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   292             if (uimode) {
   293                 [uimode release];
   294                 mode->driverdata = NULL;
   295             }
   296         }
   297     }
   298 }
   299 
   300 /* vi: set ts=4 sw=4 expandtab: */