Fixed bug 2563 - Remove obsolete code for supporting iOS < 5

Alex Szpakowski

Now that SDL for iOS requires at least iOS 5.1 at runtime, there are several old codepaths in the UIKit backend which can be removed. I've attached a patch which does so.

include/SDL_config_iphoneos.h

@@ -134,6 +134,7 @@
 #define SDL_VIDEO_DRIVER_DUMMY  1
 
 /* enable OpenGL ES */
+#define SDL_VIDEO_OPENGL_ES2 1
 #define SDL_VIDEO_OPENGL_ES 1
 #define SDL_VIDEO_RENDER_OGL_ES 1
 #define SDL_VIDEO_RENDER_OGL_ES2    1

src/video/uikit/SDL_uikitmodes.h

@@ -37,8 +37,6 @@ typedef struct
     CGFloat scale;
 } SDL_DisplayModeData;
 
-extern BOOL SDL_UIKit_supports_multiple_displays;
-
 extern SDL_bool UIKit_IsDisplayLandscape(UIScreen *uiscreen);
 
 extern int UIKit_InitModes(_THIS);

src/video/uikit/SDL_uikitmodes.m

@@ -26,9 +26,6 @@
 #include "SDL_uikitmodes.h"
 
 
-BOOL SDL_UIKit_supports_multiple_displays = NO;
-
-
 static int
 UIKit_AllocateDisplayModeData(SDL_DisplayMode * mode,
     UIScreenMode * uiscreenmode, CGFloat scale)
@@ -56,10 +53,7 @@ UIKit_AllocateDisplayModeData(SDL_DisplayMode * mode,
 static void
 UIKit_FreeDisplayModeData(SDL_DisplayMode * mode)
 {
-    if (!SDL_UIKit_supports_multiple_displays) {
-        /* Not on at least iPhoneOS 3.2 (versions prior to iPad). */
-        SDL_assert(mode->driverdata == NULL);
-    } else if (mode->driverdata != NULL) {
+    if (mode->driverdata != NULL) {
         SDL_DisplayModeData *data = (SDL_DisplayModeData *)mode->driverdata;
         [data->uiscreenmode release];
         SDL_free(data);
@@ -121,19 +115,12 @@ UIKit_AddDisplay(UIScreen *uiscreen)
     }
 
     /* When dealing with UIKit all coordinates are specified in terms of
-     * what Apple refers to as points. On earlier devices without the
-     * so called "Retina" display, there is a one to one mapping between
-     * points and pixels. In other cases [UIScreen scale] indicates the
+     * what Apple refers to as points. [UIScreen scale] indicates the
      * relationship between points and pixels. Since SDL has no notion
      * of points, we must compensate in all cases where dealing with such
      * units.
      */
-    CGFloat scale;
-    if ([UIScreen instancesRespondToSelector:@selector(scale)]) {
-        scale = [uiscreen scale]; /* iOS >= 4.0 */
-    } else {
-        scale = 1.0f; /* iOS < 4.0 */
-    }
+    CGFloat scale = [uiscreen scale];
 
     SDL_VideoDisplay display;
     SDL_DisplayMode mode;
@@ -142,13 +129,7 @@ UIKit_AddDisplay(UIScreen *uiscreen)
     mode.w = (int)(size.width * scale);
     mode.h = (int)(size.height * scale);
 
-    UIScreenMode * uiscreenmode = nil;
-    /* UIScreenMode showed up in 3.2 (the iPad and later). We're
-     * misusing this supports_multiple_displays flag here for that.
-     */
-    if (SDL_UIKit_supports_multiple_displays) {
-        uiscreenmode = [uiscreen currentMode];
-    }
+    UIScreenMode * uiscreenmode = [uiscreen currentMode];
 
     if (UIKit_AllocateDisplayModeData(&mode, uiscreenmode, scale) < 0) {
         return -1;
@@ -189,30 +170,12 @@ UIKit_IsDisplayLandscape(UIScreen *uiscreen)
 int
 UIKit_InitModes(_THIS)
 {
-    /* this tells us whether we are running on ios >= 3.2 */
-    SDL_UIKit_supports_multiple_displays = [UIScreen instancesRespondToSelector:@selector(currentMode)];
-
-    /* Add the main screen. */
-    if (UIKit_AddDisplay([UIScreen mainScreen]) < 0) {
-        return -1;
-    }
-
-    /* If this is iPhoneOS < 3.2, all devices are one screen, 320x480 pixels. */
-    /*  The iPad added both a larger main screen and the ability to use
-     *  external displays. So, add the other displays (screens in UI speak).
-     */
-    if (SDL_UIKit_supports_multiple_displays) {
     for (UIScreen *uiscreen in [UIScreen screens]) {
-            /* Only add the other screens */
-            if (uiscreen != [UIScreen mainScreen]) {
         if (UIKit_AddDisplay(uiscreen) < 0) {
             return -1;
         }
     }
-        }
-    }
 
-    /* We're done! */
     return 0;
 }
 
@@ -224,10 +187,6 @@ UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
     SDL_bool isLandscape = UIKit_IsDisplayLandscape(data->uiscreen);
     SDL_bool addRotation = (data->uiscreen == [UIScreen mainScreen]);
 
-    if (SDL_UIKit_supports_multiple_displays) {
-        /* availableModes showed up in 3.2 (the iPad and later). We should only
-         * land here for at least that version of the OS.
-         */
     for (UIScreenMode *uimode in [data->uiscreen availableModes]) {
         CGSize size = [uimode size];
         int w = (int)size.width;
@@ -253,32 +212,14 @@ UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
                 1.0f, uimode, addRotation);
         }
     }
-    } else {
-        const CGSize size = [data->uiscreen bounds].size;
-        int w = (int)size.width;
-        int h = (int)size.height;
-
-        /* Make sure the width/height are oriented correctly */
-        if (isLandscape != (w > h)) {
-            int tmp = w;
-            w = h;
-            h = tmp;
-        }
-
-        UIKit_AddDisplayMode(display, w, h, 1.0f, nil, addRotation);
-    }
 }
 
 int
 UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
 {
     SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
-
-    if (!SDL_UIKit_supports_multiple_displays) {
-        /* Not on at least iPhoneOS 3.2 (versions prior to iPad). */
-        SDL_assert(mode->driverdata == NULL);
-    } else {
     SDL_DisplayModeData *modedata = (SDL_DisplayModeData *)mode->driverdata;
+
     [data->uiscreen setCurrentMode:modedata->uiscreenmode];
 
     if (data->uiscreen == [UIScreen mainScreen]) {
@@ -292,7 +233,7 @@ UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
             }
         }
     }
-    }
+
     return 0;
 }
 

src/video/uikit/SDL_uikitopenglview.h

@@ -79,7 +79,7 @@
 - (void)startAnimation;
 - (void)stopAnimation;
 
-- (void)doLoop:(id)sender;
+- (void)doLoop:(CADisplayLink*)sender;
 
 @end
 

src/video/uikit/SDL_uikitopenglview.m

@@ -84,7 +84,6 @@
         }
 
         /* Set the appropriate scale (for retina display support) */
-        if ([self respondsToSelector:@selector(contentScaleFactor)])
         self.contentScaleFactor = scale;
 
         /* create the buffers */
@@ -171,11 +170,7 @@
 
 - (void)startAnimation
 {
-    /* CADisplayLink is API new to iPhone SDK 3.1.
-     * Compiling against earlier versions will result in a warning, but can be dismissed
-     * if the system version runtime check for CADisplayLink exists in -initWithCoder:.
-     */
-    displayLink = [NSClassFromString(@"CADisplayLink") displayLinkWithTarget:self selector:@selector(doLoop:)];
+    displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(doLoop:)];
     [displayLink setFrameInterval:animationInterval];
     [displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
 }
@@ -186,7 +181,7 @@
     displayLink = nil;
 }
 
-- (void)doLoop:(id)sender
+- (void)doLoop:(CADisplayLink*)sender
 {
     /* Don't run the game loop while a messagebox is up */
     if (!UIKit_ShowingMessageBox()) {

src/video/uikit/SDL_uikitview.m

@@ -372,6 +372,7 @@ void _uikit_keyboard_update() {
     int height = view.keyboardHeight;
     int offsetx = 0;
     int offsety = 0;
+    float scale = [UIScreen mainScreen].scale;
     if (height) {
         int sw,sh;
         SDL_GetWindowSize(window,&sw,&sh);
@@ -392,11 +393,10 @@ void _uikit_keyboard_update() {
     if (ui_orient == UIInterfaceOrientationPortraitUpsideDown) {
         offsety = -offsety;
     }
-    if ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)]) {
-        float scale = [UIScreen mainScreen].scale;
+
     offsetx /= scale;
     offsety /= scale;
-    }
+
     view.frame = CGRectMake(offsetx,offsety,view.frame.size.width,view.frame.size.height);
 }
 
@@ -424,9 +424,7 @@ void _uikit_keyboard_init() {
                         if (ui_orient == UIInterfaceOrientationLandscapeRight || ui_orient == UIInterfaceOrientationLandscapeLeft) {
                             height = keyboardSize.width;
                         }
-                        if ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)]) {
                         height *= [UIScreen mainScreen].scale;
-                        }
                         _uikit_keyboard_set_height(height);
                     }
      ];

src/video/uikit/SDL_uikitwindow.m

@@ -130,6 +130,7 @@ UIKit_CreateWindow(_THIS, SDL_Window *window)
     SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
     SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
     const BOOL external = ([UIScreen mainScreen] != data->uiscreen);
+    const CGSize origsize = [[data->uiscreen currentMode] size];
 
     /* SDL currently puts this window at the start of display's linked list. We rely on this. */
     SDL_assert(_this->windows == window);
@@ -143,8 +144,6 @@ UIKit_CreateWindow(_THIS, SDL_Window *window)
      * user, so it's in standby), try to force the display to a resolution
      * that most closely matches the desired window size.
      */
-    if (SDL_UIKit_supports_multiple_displays) {
-        const CGSize origsize = [[data->uiscreen currentMode] size];
     if ((origsize.width == 0.0f) && (origsize.height == 0.0f)) {
         if (display->num_display_modes == 0) {
             _this->GetDisplayModes(_this, display);
@@ -169,7 +168,6 @@ UIKit_CreateWindow(_THIS, SDL_Window *window)
             display->current_mode = *bestmode;
         }
     }
-    }
 
     if (data->uiscreen == [UIScreen mainScreen]) {
         if (window->flags & (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_BORDERLESS)) {