src/video/uikit/SDL_uikitvideo.m
author Kees Bakker
Sun, 09 Oct 2011 22:00:20 +0200
changeset 6013 b253cc3c4276
parent 6009 fb5fa3561ca9
child 6014 7a8b72b88d86
permissions -rw-r--r--
Do not use UIScreenMode to add a iOS display, always use the boundary

This solves the problem that on iPad you would get 1024x768 instead
of 768x1024 when calling SDL_GetDesktopDisplayMode(0, &mode)
See Apple's doc for UIScreenMode where is says:
"Most developers should never need to use the information provided
by this class and should simply use the bounds provided by the
UIScreen object for their drawing space."
     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     // Add the main screen.
   203     UIScreen *uiscreen = [UIScreen mainScreen];
   204     UIScreenMode *uiscreenmode = [uiscreen currentMode];
   205     const CGSize size = [uiscreen bounds].size;
   206     UIKit_AddDisplay(uiscreen, uiscreenmode, (int)size.width, (int)size.height);
   207 
   208     // If this is iPhoneOS < 3.2, all devices are one screen, 320x480 pixels.
   209     //  The iPad added both a larger main screen and the ability to use
   210     //  external displays. So, add the other displays (screens in UI speak).
   211     if (SDL_UIKit_supports_multiple_displays) {
   212         for (UIScreen *uiscreen in [UIScreen screens]) {
   213             // Only add the other screens
   214             if (uiscreen != [UIScreen mainScreen]) {
   215                 UIScreenMode *uiscreenmode = [uiscreen currentMode];
   216                 const CGSize size = [uiscreen bounds].size;
   217                 UIKit_AddDisplay(uiscreen, uiscreenmode, (int)size.width, (int)size.height);
   218             }
   219         }
   220     }
   221 
   222     /* We're done! */
   223     return 0;
   224 }
   225 
   226 static int
   227 UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   228 {
   229     UIScreen *uiscreen = (UIScreen *) display->driverdata;
   230     if (!SDL_UIKit_supports_multiple_displays) {
   231         // Not on at least iPhoneOS 3.2 (versions prior to iPad).
   232         SDL_assert(mode->driverdata == NULL);
   233     } else {
   234         UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   235         [uiscreen setCurrentMode:uimode];
   236     }
   237 
   238     return 0;
   239 }
   240 
   241 void
   242 UIKit_VideoQuit(_THIS)
   243 {
   244     // Release Objective-C objects, so higher level doesn't free() them.
   245     int i, j;
   246     for (i = 0; i < _this->num_displays; i++) {
   247         SDL_VideoDisplay *display = &_this->displays[i];
   248         UIScreen *uiscreen = (UIScreen *) display->driverdata;
   249         [uiscreen release];
   250         display->driverdata = NULL;
   251         for (j = 0; j < display->num_display_modes; j++) {
   252             SDL_DisplayMode *mode = &display->display_modes[j];
   253             UIScreenMode *uimode = (UIScreenMode *) mode->driverdata;
   254             if (uimode) {
   255                 [uimode release];
   256                 mode->driverdata = NULL;
   257             }
   258         }
   259     }
   260 }
   261 
   262 /* vi: set ts=4 sw=4 expandtab: */