Update the code for the iOS demos to handle modern devices. Fixes bug #3337

Xcode-iOS/Demos/Demos.xcodeproj/project.pbxproj

@@ -24,6 +24,13 @@
 		FA30DECD1BBF5C14009C397F /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1DF5F4DF0D08C38300B7A737 /* UIKit.framework */; };
 		FA30DECE1BBF5C14009C397F /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 1D30AB110D05D00D00671497 /* Foundation.framework */; };
 		FA30DECF1BBF5C14009C397F /* CoreAudio.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FDF0D71D0E12D2AB00247964 /* CoreAudio.framework */; };
+		FA86C0371D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C0381D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C0391D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C03A1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C03B1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C03C1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
+		FA86C03D1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */; };
 		FA8B4BA31967070A00F8EB7C /* CoreMotion.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FA8B4BA21967070A00F8EB7C /* CoreMotion.framework */; };
 		FA8B4BA41967071300F8EB7C /* CoreMotion.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FA8B4BA21967070A00F8EB7C /* CoreMotion.framework */; };
 		FA8B4BA51967071A00F8EB7C /* CoreMotion.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = FA8B4BA21967070A00F8EB7C /* CoreMotion.framework */; };
@@ -220,6 +227,7 @@
 		1DF5F4DF0D08C38300B7A737 /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
 		8D1107310486CEB800E47090 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		FA30DE961BBF59D9009C397F /* Happy-TV.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Happy-TV.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = "iOS Launch Screen.storyboard"; sourceTree = "<group>"; };
 		FA8B4BA21967070A00F8EB7C /* CoreMotion.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreMotion.framework; path = System/Library/Frameworks/CoreMotion.framework; sourceTree = SDKROOT; };
 		FABA34D31D8B5E5600915323 /* AVFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AVFoundation.framework; path = System/Library/Frameworks/AVFoundation.framework; sourceTree = SDKROOT; };
 		FABA34D71D8B5E7700915323 /* AVFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AVFoundation.framework; path = Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS10.0.sdk/System/Library/Frameworks/AVFoundation.framework; sourceTree = DEVELOPER_DIR; };
@@ -423,6 +431,7 @@
 		29B97314FDCFA39411CA2CEA /* CustomTemplate */ = {
 			isa = PBXGroup;
 			children = (
+				FA86C0361D9765BA009CB637 /* iOS Launch Screen.storyboard */,
 				FD1B48920E313154007AB34E /* SDL.xcodeproj */,
 				FD77A0040E26BC0500F39101 /* src */,
 				29B97317FDCFA39411CA2CEA /* Resources */,
@@ -676,7 +685,9 @@
 				TargetAttributes = {
 					FA30DE951BBF59D9009C397F = {
 						CreatedOnToolsVersion = 7.1;
-						DevelopmentTeam = DJN9C5VR5G;
+					};
+					FDC52EC60E2843D6008D768C = {
+						ProvisioningStyle = Automatic;
 					};
 				};
 			};
@@ -735,6 +746,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				FA86C0371D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 				FD925B1B0E0F276600E92347 /* Icon.png in Resources */,
 				FD787AA20E22A5CC003E8E36 /* Default.png in Resources */,
 			);
@@ -755,6 +767,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				FDB651D00E43D1AD00F688B5 /* icon.bmp in Resources */,
+				FA86C0381D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 				FD925B1A0E0F276600E92347 /* Icon.png in Resources */,
 				FD787AA10E22A5CC003E8E36 /* Default.png in Resources */,
 			);
@@ -768,6 +781,7 @@
 				FDB651D10E43D1B300F688B5 /* ship.bmp in Resources */,
 				FD925B190E0F276600E92347 /* Icon.png in Resources */,
 				FD787AA30E22A5CC003E8E36 /* Default.png in Resources */,
+				FA86C0391D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -779,6 +793,7 @@
 				FDB651FA0E43D1F300F688B5 /* Icon.png in Resources */,
 				FDB651FB0E43D1F300F688B5 /* Default.png in Resources */,
 				FDB652C70E43E25900F688B5 /* kromasky_16x16.bmp in Resources */,
+				FA86C03D1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -787,6 +802,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				FDB651D30E43D1BA00F688B5 /* stroke.bmp in Resources */,
+				FA86C03A1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 				FDC202E10E107B1200ABAC90 /* Icon.png in Resources */,
 				FD787AA40E22A5CC003E8E36 /* Default.png in Resources */,
 			);
@@ -797,6 +813,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				FDB651D80E43D1D800F688B5 /* stroke.bmp in Resources */,
+				FA86C03C1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 				FDC52EC80E2843D6008D768C /* Icon.png in Resources */,
 				FDC52EC90E2843D6008D768C /* Default.png in Resources */,
 			);
@@ -809,6 +826,7 @@
 				FDB651D40E43D1C500F688B5 /* ds_brush_snare.wav in Resources */,
 				FDB651D50E43D1C500F688B5 /* ds_china.wav in Resources */,
 				FDB651D60E43D1C500F688B5 /* ds_kick_big_amb.wav in Resources */,
+				FA86C03B1D9765BB009CB637 /* iOS Launch Screen.storyboard in Resources */,
 				FDB651D70E43D1C500F688B5 /* ds_loose_skin_mute.wav in Resources */,
 				FDF0D6960E12D05400247964 /* Icon.png in Resources */,
 				FD787AA50E22A5CC003E8E36 /* Default.png in Resources */,
@@ -940,6 +958,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Rectangles;
 				PRODUCT_NAME = Rectangles;
 			};
 			name = Debug;
@@ -948,6 +967,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Rectangles;
 				PRODUCT_NAME = Rectangles;
 			};
 			name = Release;
@@ -995,6 +1015,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = dwarf;
+				DEVELOPMENT_TEAM = "";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -1013,7 +1034,7 @@
 				INFOPLIST_FILE = Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.Happy-TV";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourcompany.Happy-TV";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
 				TARGETED_DEVICE_FAMILY = 3;
@@ -1040,6 +1061,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				DEVELOPMENT_TEAM = "";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -1053,7 +1075,7 @@
 				INFOPLIST_FILE = Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.Happy-TV";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.yourcompany.Happy-TV";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
 				TARGETED_DEVICE_FAMILY = 3;
@@ -1067,6 +1089,7 @@
 			buildSettings = {
 				GCC_DYNAMIC_NO_PIC = NO;
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Happy;
 				PRODUCT_NAME = Happy;
 				SDKROOT = iphoneos;
 			};
@@ -1076,6 +1099,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Happy;
 				PRODUCT_NAME = Happy;
 				SDKROOT = iphoneos;
 			};
@@ -1085,6 +1109,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Accel;
 				PRODUCT_NAME = Accel;
 				SDKROOT = iphoneos;
 			};
@@ -1094,6 +1119,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Accel;
 				PRODUCT_NAME = Accel;
 				SDKROOT = iphoneos;
 			};
@@ -1103,6 +1129,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Keyboard;
 				PRODUCT_NAME = Keyboard;
 				SDKROOT = iphoneos;
 			};
@@ -1112,6 +1139,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Keyboard;
 				PRODUCT_NAME = Keyboard;
 				SDKROOT = iphoneos;
 			};
@@ -1121,6 +1149,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Touch;
 				PRODUCT_NAME = Touch;
 				SDKROOT = iphoneos;
 			};
@@ -1130,6 +1159,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Touch;
 				PRODUCT_NAME = Touch;
 				SDKROOT = iphoneos;
 			};
@@ -1138,7 +1168,10 @@
 		FDC52EDC0E2843D6008D768C /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Fireworks;
 				PRODUCT_NAME = Fireworks;
 				SDKROOT = iphoneos;
 			};
@@ -1147,7 +1180,10 @@
 		FDC52EDD0E2843D6008D768C /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Fireworks;
 				PRODUCT_NAME = Fireworks;
 				SDKROOT = iphoneos;
 			};
@@ -1157,6 +1193,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Mixer;
 				PRODUCT_NAME = Mixer;
 				SDKROOT = iphoneos;
 			};
@@ -1166,6 +1203,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				INFOPLIST_FILE = Info.plist;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.Mixer;
 				PRODUCT_NAME = Mixer;
 				SDKROOT = iphoneos;
 			};

Xcode-iOS/Demos/Info.plist

@@ -11,7 +11,7 @@
 	<key>CFBundleIconFile</key>
 	<string></string>
 	<key>CFBundleIdentifier</key>
-	<string>com.yourcompany.${PRODUCT_NAME:identifier}</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
@@ -24,6 +24,8 @@
 	<string>1.0</string>
 	<key>NSMainNibFile</key>
 	<string></string>
+	<key>UILaunchStoryboardName</key>
+	<string>iOS Launch Screen</string>
 	<key>UISupportedInterfaceOrientations</key>
 	<array/>
 </dict>

Xcode-iOS/Demos/iOS Launch Screen.storyboard

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11201" systemVersion="16A323" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11161"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
+                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="Default.png" translatesAutoresizingMaskIntoConstraints="NO" id="VeL-6u-rS3"/>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="VeL-6u-rS3" firstAttribute="top" secondItem="Ze5-6b-2t3" secondAttribute="top" id="C5X-Vg-tvO"/>
+                            <constraint firstAttribute="trailing" secondItem="VeL-6u-rS3" secondAttribute="trailing" id="X4i-1U-3JE"/>
+                            <constraint firstItem="VeL-6u-rS3" firstAttribute="bottom" secondItem="xb3-aO-Qok" secondAttribute="top" id="dSu-2l-DcF"/>
+                            <constraint firstItem="VeL-6u-rS3" firstAttribute="leading" secondItem="Ze5-6b-2t3" secondAttribute="leading" id="xKC-uj-bxE"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="52" y="374.66266866566718"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="Default.png" width="320" height="480"/>
+    </resources>
+</document>

Xcode-iOS/Demos/src/accelerometer.c

@@ -8,7 +8,6 @@
 #include "math.h"
 #include "common.h"
 
-#define MILLESECONDS_PER_FRAME 16       /* about 60 frames per second */
 #define DAMPING 0.5f;           /* after bouncing off a wall, damping coefficient determines final speed */
 #define FRICTION 0.0008f        /* coefficient of acceleration that opposes direction of motion */
 #define GRAVITY_CONSTANT 0.004f /* how sensitive the ship is to the accelerometer */
@@ -31,9 +30,9 @@ static SDL_Texture *ship = 0;        /* texture for spaceship */
 static SDL_Texture *space = 0;       /* texture for space (background */
 
 void
-render(SDL_Renderer *renderer, int w, int h)
+render(SDL_Renderer *renderer, int w, int h, double deltaTime)
 {
-
+    double deltaMilliseconds = deltaTime * 1000;
     float speed;
 
     /* get joystick (accelerometer) axis values and normalize them */
@@ -54,10 +53,10 @@ render(SDL_Renderer *renderer, int w, int h)
      */
     shipData.vx +=
         ax * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT *
-        MILLESECONDS_PER_FRAME;
+        deltaMilliseconds;
     shipData.vy +=
         ay * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT *
-        MILLESECONDS_PER_FRAME;
+        deltaMilliseconds;
 
     speed = sqrt(shipData.vx * shipData.vx + shipData.vy * shipData.vy);
 
@@ -67,10 +66,10 @@ render(SDL_Renderer *renderer, int w, int h)
         float diry = shipData.vy / speed;   /* normalized y velocity */
 
         /* update velocity due to friction */
-        if (speed - FRICTION * MILLESECONDS_PER_FRAME > 0) {
+        if (speed - FRICTION * deltaMilliseconds > 0) {
             /* apply friction */
-            shipData.vx -= dirx * FRICTION * MILLESECONDS_PER_FRAME;
-            shipData.vy -= diry * FRICTION * MILLESECONDS_PER_FRAME;
+            shipData.vx -= dirx * FRICTION * deltaMilliseconds;
+            shipData.vy -= diry * FRICTION * deltaMilliseconds;
         } else {
             /* applying friction would MORE than stop the ship, so just stop the ship */
             shipData.vx = 0.0f;
@@ -79,8 +78,8 @@ render(SDL_Renderer *renderer, int w, int h)
     }
 
     /* update ship location */
-    shipData.x += shipData.vx * MILLESECONDS_PER_FRAME;
-    shipData.y += shipData.vy * MILLESECONDS_PER_FRAME;
+    shipData.x += shipData.vx * deltaMilliseconds;
+    shipData.y += shipData.vy * deltaMilliseconds;
 
     if (shipData.x > maxx) {
         shipData.x = maxx;
@@ -161,9 +160,6 @@ main(int argc, char *argv[])
 
     SDL_Window *window;         /* main window */
     SDL_Renderer *renderer;
-    Uint32 startFrame;          /* time frame began to process */
-    Uint32 endFrame;            /* time frame ended processing */
-    Sint32 delay;               /* time to pause waiting to draw next frame */
     int done;                   /* should we clean up and exit? */
     int w, h;
 
@@ -173,12 +169,11 @@ main(int argc, char *argv[])
     }
 
     /* create main window and renderer */
-    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
-                                SDL_WINDOW_OPENGL |
-                                SDL_WINDOW_FULLSCREEN);
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_FULLSCREEN | SDL_WINDOW_ALLOW_HIGHDPI);
     renderer = SDL_CreateRenderer(window, 0, 0);
     
     SDL_GetWindowSize(window, &w, &h);
+    SDL_RenderSetLogicalSize(renderer, w, h);
 
     /* print out some info about joysticks and try to open accelerometer for use */
     printf("There are %d joysticks available\n", SDL_NumJoysticks());
@@ -208,24 +203,15 @@ main(int argc, char *argv[])
     done = 0;
     /* enter main loop */
     while (!done) {
+        double deltaTime = updateDeltaTime();
         SDL_Event event;
-        startFrame = SDL_GetTicks();
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_QUIT) {
                 done = 1;
             }
         }
-        render(renderer, w, h);
-        endFrame = SDL_GetTicks();
-
-        /* figure out how much time we have left, and then sleep */
-        delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
-        if (delay < 0) {
-            delay = 0;
-        } else if (delay > MILLESECONDS_PER_FRAME) {
-            delay = MILLESECONDS_PER_FRAME;
-        }
-        SDL_Delay(delay);
+        render(renderer, w, h, deltaTime);
+        SDL_Delay(1);
     }
 
     /* delete textures */

Xcode-iOS/Demos/src/common.c

@@ -32,5 +32,25 @@ void
 fatalError(const char *string)
 {
     printf("%s: %s\n", string, SDL_GetError());
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, string, SDL_GetError(), NULL);
     exit(1);
 }
+
+static Uint64 prevTime = 0;
+
+double
+updateDeltaTime()
+{
+    Uint64 curTime;
+    double deltaTime;
+
+    if (prevTime == 0) {
+        prevTime = SDL_GetPerformanceCounter();
+    }
+
+    curTime = SDL_GetPerformanceCounter();
+    deltaTime = (double) (curTime - prevTime) / (double) SDL_GetPerformanceFrequency();
+    prevTime = curTime;
+
+    return deltaTime;
+}

Xcode-iOS/Demos/src/common.h

@@ -4,14 +4,7 @@
  *  use however you want
  */
 
-#if __TVOS__
-#define SCREEN_WIDTH 1920
-#define SCREEN_HEIGHT 1080
-#else
-#define SCREEN_WIDTH 320
-#define SCREEN_HEIGHT 480
-#endif
-
 extern int randomInt(int min, int max);
 extern float randomFloat(float min, float max);
 extern void fatalError(const char *string);
+extern double updateDeltaTime();

Xcode-iOS/Demos/src/fireworks.c

@@ -10,13 +10,13 @@
 #include <math.h>
 #include <time.h>
 
-#define MILLESECONDS_PER_FRAME 16       /* about 60 frames per second */
 #define ACCEL 0.0001f           /* acceleration due to gravity, units in pixels per millesecond squared */
 #define WIND_RESISTANCE 0.00005f        /* acceleration per unit velocity due to wind resistance */
 #define MAX_PARTICLES 2000      /* maximum number of particles displayed at once */
 
 static GLuint particleTextureID;        /* OpenGL particle texture id */
 static SDL_bool pointSizeExtensionSupported;    /* is GL_OES_point_size_array supported ? */
+static float pointSizeScale;
 /*
     used to describe what type of particle a given struct particle is.
     emitter - this particle flies up, shooting off trail particles, then finally explodes into dust particles.
@@ -55,7 +55,7 @@ void initializeParticles(void);
 void initializeTexture();
 int nextPowerOfTwo(int x);
 void drawParticles();
-void stepParticles(void);
+void stepParticles(double deltaTime);
 
 /*  helper function (used in texture loading)
     returns next power of two greater than or equal to x
@@ -74,8 +74,9 @@ nextPowerOfTwo(int x)
     steps each active particle by timestep MILLESECONDS_PER_FRAME
 */
 void
-stepParticles(void)
+stepParticles(double deltaTime)
 {
+    float deltaMilliseconds = deltaTime * 1000;
     int i;
     struct particle *slot = particles;
     struct particle *curr = particles;
@@ -93,10 +94,10 @@ stepParticles(void)
                 curr->isActive = 0;
 
             /* step velocity, then step position */
-            curr->yvel += ACCEL * MILLESECONDS_PER_FRAME;
+            curr->yvel += ACCEL * deltaMilliseconds;
             curr->xvel += 0.0f;
-            curr->y += curr->yvel * MILLESECONDS_PER_FRAME;
-            curr->x += curr->xvel * MILLESECONDS_PER_FRAME;
+            curr->y += curr->yvel * deltaMilliseconds;
+            curr->x += curr->xvel * deltaMilliseconds;
 
             /* particle behavior */
             if (curr->type == emitter) {
@@ -111,29 +112,29 @@ stepParticles(void)
                     sqrt(curr->xvel * curr->xvel + curr->yvel * curr->yvel);
                 /*      if wind resistance is not powerful enough to stop us completely,
                    then apply winde resistance, otherwise just stop us completely */
-                if (WIND_RESISTANCE * MILLESECONDS_PER_FRAME < speed) {
+                if (WIND_RESISTANCE * deltaMilliseconds < speed) {
                     float normx = curr->xvel / speed;
                     float normy = curr->yvel / speed;
                     curr->xvel -=
-                        normx * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
+                        normx * WIND_RESISTANCE * deltaMilliseconds;
                     curr->yvel -=
-                        normy * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
+                        normy * WIND_RESISTANCE * deltaMilliseconds;
                 } else {
                     curr->xvel = curr->yvel = 0;        /* stop particle */
                 }
 
-                if (curr->color[3] <= MILLESECONDS_PER_FRAME * 0.1275f) {
+                if (curr->color[3] <= deltaMilliseconds * 0.1275f) {
                     /* if this next step will cause us to fade out completely
                        then just mark for deletion */
                     curr->isActive = 0;
                 } else {
                     /* otherwise, let's fade a bit more */
-                    curr->color[3] -= MILLESECONDS_PER_FRAME * 0.1275f;
+                    curr->color[3] -= deltaMilliseconds * 0.1275f;
                 }
 
                 /* if we're a dust particle, shrink our size */
                 if (curr->type == dust)
-                    curr->size -= MILLESECONDS_PER_FRAME * 0.010f;
+                    curr->size -= deltaMilliseconds * 0.010f;
 
             }
 
@@ -147,7 +148,7 @@ stepParticles(void)
     /* the number of active particles is computed as the difference between
        old number of active particles, where slot points, and the
        new size of the array, where particles points */
-    num_active_particles = slot - particles;
+    num_active_particles = (int) (slot - particles);
 }
 
 /*
@@ -206,7 +207,7 @@ explodeEmitter(struct particle *emitter)
         p->y = emitter->y + emitter->yvel;
         p->isActive = 1;
         p->type = dust;
-        p->size = 15;
+        p->size = 15 * pointSizeScale;
         /* inherit emitter's color */
         p->color[0] = emitter->color[0];
         p->color[1] = emitter->color[1];
@@ -244,7 +245,7 @@ spawnTrailFromEmitter(struct particle *emitter)
     p->color[3] = (0.7f) * 255;
 
     /* set other attributes */
-    p->size = 10;
+    p->size = 10 * pointSizeScale;
     p->type = trail;
     p->isActive = 1;
 
@@ -298,7 +299,7 @@ spawnEmitterParticle(GLfloat x, GLfloat y)
     p->xvel = 0;
     p->yvel = -sqrt(2 * ACCEL * (screen_h - y));
     /* set other attributes */
-    p->size = 10;
+    p->size = 10 * pointSizeScale;
     p->type = emitter;
     p->isActive = 1;
     /* our array has expanded at the end */
@@ -363,7 +364,7 @@ main(int argc, char *argv[])
 {
     SDL_Window *window;         /* main window */
     SDL_GLContext context;
-    int w, h;
+    int drawableW, drawableH;
     Uint32 startFrame;          /* time frame began to process */
     Uint32 endFrame;            /* time frame ended processing */
     Uint32 delay;               /* time to pause waiting to draw next frame */
@@ -391,11 +392,19 @@ main(int argc, char *argv[])
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
 
     /* create main window and renderer */
-    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
-                                SDL_WINDOW_OPENGL |
-                                SDL_WINDOW_BORDERLESS);
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480,
+                                SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALLOW_HIGHDPI);
     context = SDL_GL_CreateContext(window);
 
+    /* The window size and drawable size may be different when highdpi is enabled,
+     * due to the increased pixel density of the drawable. */
+    SDL_GetWindowSize(window, &screen_w, &screen_h);
+    SDL_GL_GetDrawableSize(window, &drawableW, &drawableH);
+
+    /* In OpenGL, point sizes are always in pixels. We don't want them looking
+     * tiny on a retina screen. */
+    pointSizeScale = (float) drawableH / (float) screen_h;
+
     /* load the particle texture */
     initializeTexture();
 
@@ -412,8 +421,7 @@ main(int argc, char *argv[])
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
-    SDL_GetWindowSize(window, &screen_w, &screen_h);
-    glViewport(0, 0, screen_w, screen_h);
+    glViewport(0, 0, drawableW, drawableH);
 
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
@@ -436,14 +444,14 @@ main(int argc, char *argv[])
         glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
     } else {
         /* if extension not available then all particles have size 10 */
-        glPointSize(10);
+        glPointSize(10 * pointSizeScale);
     }
 
     done = 0;
     /* enter main loop */
     while (!done) {
-        startFrame = SDL_GetTicks();
         SDL_Event event;
+        double deltaTime = updateDeltaTime();
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_QUIT) {
                 done = 1;
@@ -454,19 +462,10 @@ main(int argc, char *argv[])
                 spawnEmitterParticle(x, y);
             }
         }
-        stepParticles();
+        stepParticles(deltaTime);
         drawParticles();
         SDL_GL_SwapWindow(window);
-        endFrame = SDL_GetTicks();
-
-        /* figure out how much time we have left, and then sleep */
-        delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
-        if (delay > MILLESECONDS_PER_FRAME) {
-            delay = MILLESECONDS_PER_FRAME;
-        }
-        if (delay > 0) {
-            SDL_Delay(delay);
-        }
+        SDL_Delay(1);
     }
 
     /* delete textures */

Xcode-iOS/Demos/src/happy.c

@@ -8,8 +8,7 @@
 #include "common.h"
 
 #define NUM_HAPPY_FACES 100     /* number of faces to draw */
-#define MILLESECONDS_PER_FRAME 16       /* about 60 frames per second */
-#define HAPPY_FACE_SIZE 32      /* width and height of happyface (pixels) */
+#define HAPPY_FACE_SIZE 32      /* width and height of happyface */
 
 static SDL_Texture *texture = 0;    /* reference to texture holding happyface */
 
@@ -24,30 +23,37 @@ static struct
     units of velocity are pixels per millesecond
 */
 void
-initializeHappyFaces()
+initializeHappyFaces(SDL_Renderer *renderer)
 {
     int i;
+    int w;
+    int h;
+    SDL_RenderGetLogicalSize(renderer, &w, &h);
+
     for (i = 0; i < NUM_HAPPY_FACES; i++) {
-        faces[i].x = randomFloat(0.0f, SCREEN_WIDTH - HAPPY_FACE_SIZE);
-        faces[i].y = randomFloat(0.0f, SCREEN_HEIGHT - HAPPY_FACE_SIZE);
-        faces[i].xvel = randomFloat(-0.1f, 0.1f);
-        faces[i].yvel = randomFloat(-0.1f, 0.1f);
+        faces[i].x = randomFloat(0.0f, w - HAPPY_FACE_SIZE);
+        faces[i].y = randomFloat(0.0f, h - HAPPY_FACE_SIZE);
+        faces[i].xvel = randomFloat(-60.0f, 60.0f);
+        faces[i].yvel = randomFloat(-60.0f, 60.0f);
     }
 }
 
 void
-render(SDL_Renderer *renderer)
+render(SDL_Renderer *renderer, double deltaTime)
 {
-
     int i;
     SDL_Rect srcRect;
     SDL_Rect dstRect;
+    int w;
+    int h;
+
+    SDL_RenderGetLogicalSize(renderer, &w, &h);
 
     /* setup boundaries for happyface bouncing */
-    Uint16 maxx = SCREEN_WIDTH - HAPPY_FACE_SIZE;
-    Uint16 maxy = SCREEN_HEIGHT - HAPPY_FACE_SIZE;
-    Uint16 minx = 0;
-    Uint16 miny = 0;
+    int maxx = w - HAPPY_FACE_SIZE;
+    int maxy = h - HAPPY_FACE_SIZE;
+    int minx = 0;
+    int miny = 0;
 
     /* setup rects for drawing */
     srcRect.x = 0;
@@ -68,8 +74,8 @@ render(SDL_Renderer *renderer)
        - draw
      */
     for (i = 0; i < NUM_HAPPY_FACES; i++) {
-        faces[i].x += faces[i].xvel * MILLESECONDS_PER_FRAME;
-        faces[i].y += faces[i].yvel * MILLESECONDS_PER_FRAME;
+        faces[i].x += faces[i].xvel * deltaTime;
+        faces[i].y += faces[i].yvel * deltaTime;
         if (faces[i].x > maxx) {
             faces[i].x = maxx;
             faces[i].xvel = -faces[i].xvel;
@@ -123,48 +129,45 @@ initializeTexture(SDL_Renderer *renderer)
 int
 main(int argc, char *argv[])
 {
-
     SDL_Window *window;
     SDL_Renderer *renderer;
-    Uint32 startFrame;
-    Uint32 endFrame;
-    Uint32 delay;
     int done;
+    int width;
+    int height;
 
     /* initialize SDL */
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
         fatalError("Could not initialize SDL");
     }
-    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
-                                SDL_WINDOW_OPENGL |
-                                SDL_WINDOW_BORDERLESS);
+
+    /* The specified window size doesn't matter - except for its aspect ratio,
+     * which determines whether the window is in portrait or landscape on iOS
+     * (if SDL_WINDOW_RESIZABLE isn't specified). */
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_FULLSCREEN | SDL_WINDOW_ALLOW_HIGHDPI);
 
     renderer = SDL_CreateRenderer(window, -1, 0);
 
+    SDL_GetWindowSize(window, &width, &height);
+    SDL_RenderSetLogicalSize(renderer, width, height);
+
     initializeTexture(renderer);
-    initializeHappyFaces();
+    initializeHappyFaces(renderer);
+
 
     /* main loop */
     done = 0;
     while (!done) {
         SDL_Event event;
-        startFrame = SDL_GetTicks();
+        double deltaTime = updateDeltaTime();
+
         while (SDL_PollEvent(&event)) {
             if (event.type == SDL_QUIT) {
                 done = 1;
             }
         }
-        render(renderer);
-        endFrame = SDL_GetTicks();
-
-        /* figure out how much time we have left, and then sleep */
-        delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
-        if (delay < 0) {
-            delay = 0;
-        } else if (delay > MILLESECONDS_PER_FRAME) {
-            delay = MILLESECONDS_PER_FRAME;
-        }
-        SDL_Delay(delay);
+
+        render(renderer, deltaTime);
+        SDL_Delay(1);
     }
 
     /* cleanup */

Xcode-iOS/Demos/src/keyboard.c

@@ -132,10 +132,13 @@ keyToIndex(SDL_Keysym key)
 void
 getPositionForCharNumber(int n, int *x, int *y)
 {
+    int renderW, renderH;
+    SDL_RenderGetLogicalSize(renderer, &renderW, &renderH);
+
     int x_padding = 16;         /* padding space on left and right side of screen */
     int y_padding = 32;         /* padding space at top of screen */
     /* figure out the number of characters that can fit horizontally across the screen */
-    int max_x_chars = (SCREEN_WIDTH - 2 * x_padding) / GLYPH_SIZE_SCREEN;
+    int max_x_chars = (renderW - 2 * x_padding) / GLYPH_SIZE_SCREEN;
     int line_separation = 5;    /* pixels between each line */
     *x = (n % max_x_chars) * GLYPH_SIZE_SCREEN + x_padding;
     *y = (n / max_x_chars) * (GLYPH_SIZE_SCREEN + line_separation) +
@@ -228,21 +231,25 @@ loadFont(void)
 int
 main(int argc, char *argv[])
 {
-
     int index;                  /* index of last key we pushed in the bitmap font */
     SDL_Window *window;
     SDL_Event event;            /* last event received */
     SDL_Keymod mod;             /* key modifiers of last key we pushed */
     SDL_Scancode scancode;      /* scancode of last key we pushed */
+    int width;
+    int height;
 
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
         printf("Error initializing SDL: %s", SDL_GetError());
     }
     /* create window */
-    window = SDL_CreateWindow("iPhone keyboard test", 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0);
+    window = SDL_CreateWindow("iPhone keyboard test", 0, 0, 320, 480, SDL_WINDOW_ALLOW_HIGHDPI);
     /* create renderer */
     renderer = SDL_CreateRenderer(window, -1, 0);
 
+    SDL_GetWindowSize(window, &width, &height);
+    SDL_RenderSetLogicalSize(renderer, width, height);
+
     /* load up our font */
     loadFont();
 

Xcode-iOS/Demos/src/mixer.c

@@ -33,7 +33,7 @@ static struct sound drums[NUM_DRUMS];
 void handleMouseButtonDown(SDL_Event * event);
 void handleMouseButtonUp(SDL_Event * event);
 int playSound(struct sound *);
-void initializeButtons();
+void initializeButtons(SDL_Renderer *);
 void audioCallback(void *userdata, Uint8 * stream, int len);
 void loadSound(const char *file, struct sound *s);
 
@@ -52,19 +52,21 @@ struct
 
 /* sets up the buttons (color, position, state) */
 void
-initializeButtons()
+initializeButtons(SDL_Renderer *renderer)
 {
-
     int i;
     int spacing = 10;           /* gap between drum buttons */
     SDL_Rect buttonRect;        /* keeps track of where to position drum */
     SDL_Color upColor = { 86, 86, 140, 255 };   /* color of drum when not pressed */
     SDL_Color downColor = { 191, 191, 221, 255 };       /* color of drum when pressed */
+    int renderW, renderH;
+
+    SDL_RenderGetLogicalSize(renderer, &renderW, &renderH);
 
     buttonRect.x = spacing;
     buttonRect.y = spacing;
-    buttonRect.w = SCREEN_WIDTH - 2 * spacing;
-    buttonRect.h = (SCREEN_HEIGHT - (NUM_DRUMS + 1) * spacing) / NUM_DRUMS;
+    buttonRect.w = renderW - 2 * spacing;
+    buttonRect.h = (renderH - (NUM_DRUMS + 1) * spacing) / NUM_DRUMS;
 
     /* setup each button */
     for (i = 0; i < NUM_DRUMS; i++) {
@@ -270,24 +272,23 @@ audioCallback(void *userdata, Uint8 * stream, int len)
 int
 main(int argc, char *argv[])
 {
-
     int done;                   /* has user tried to quit ? */
     SDL_Window *window;         /* main window */
     SDL_Renderer *renderer;
     SDL_Event event;
-    Uint32 startFrame;          /* holds when frame started processing */
-    Uint32 endFrame;            /* holds when frame ended processing */
-    Uint32 delay;               /* calculated delay, how long should we wait before next frame? */
     int i;
+    int width;
+    int height;
 
     if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
         fatalError("could not initialize SDL");
     }
-    window =
-        SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
-                         SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS);
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALLOW_HIGHDPI);
     renderer = SDL_CreateRenderer(window, 0, 0);
 
+    SDL_GetWindowSize(window, &width, &height);
+    SDL_RenderSetLogicalSize(renderer, width, height);
+
     /* initialize the mixer */
     SDL_memset(&mixer, 0, sizeof(mixer));
     /* setup output format */
@@ -310,12 +311,11 @@ main(int argc, char *argv[])
     loadSound("ds_china.wav", &drums[0]);
 
     /* setup positions, colors, and state of buttons */
-    initializeButtons();
+    initializeButtons(renderer);
 
     /* enter main loop */
     done = 0;
     while (!done) {
-        startFrame = SDL_GetTicks();
         while (SDL_PollEvent(&event)) {
             switch (event.type) {
             case SDL_MOUSEBUTTONDOWN:
@@ -330,16 +330,8 @@ main(int argc, char *argv[])
             }
         }
         render(renderer);               /* draw buttons */
-        endFrame = SDL_GetTicks();
-
-        /* figure out how much time we have left, and then sleep */
-        delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
-        if (delay < 0) {
-            delay = 0;
-        } else if (delay > MILLESECONDS_PER_FRAME) {
-            delay = MILLESECONDS_PER_FRAME;
-        }
-        SDL_Delay(delay);
+
+        SDL_Delay(1);
     }
 
     /* cleanup code, let's free up those sound buffers */

Xcode-iOS/Demos/src/rectangles.c

@@ -11,14 +11,18 @@
 void
 render(SDL_Renderer *renderer)
 {
-
     Uint8 r, g, b;
+    int renderW;
+    int renderH;
+
+    SDL_RenderGetLogicalSize(renderer, &renderW, &renderH);
+
     /*  Come up with a random rectangle */
     SDL_Rect rect;
     rect.w = randomInt(64, 128);
     rect.h = randomInt(64, 128);
-    rect.x = randomInt(0, SCREEN_WIDTH);
-    rect.y = randomInt(0, SCREEN_HEIGHT);
+    rect.x = randomInt(0, renderW);
+    rect.y = randomInt(0, renderH);
 
     /* Come up with a random color */
     r = randomInt(50, 255);
@@ -31,7 +35,6 @@ render(SDL_Renderer *renderer)
 
     /* update screen */
     SDL_RenderPresent(renderer);
-
 }
 
 int
@@ -42,6 +45,8 @@ main(int argc, char *argv[])
     SDL_Renderer *renderer;
     int done;
     SDL_Event event;
+    int windowW;
+    int windowH;
 
     /* initialize SDL */
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
@@ -52,7 +57,7 @@ main(int argc, char *argv[])
     srand(time(NULL));
 
     /* create window and renderer */
-    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0);
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_ALLOW_HIGHDPI);
     if (window == 0) {
         fatalError("Could not initialize Window");
     }
@@ -61,6 +66,9 @@ main(int argc, char *argv[])
         fatalError("Could not create renderer");
     }
 
+    SDL_GetWindowSize(window, &windowW, &windowH);
+    SDL_RenderSetLogicalSize(renderer, windowW, windowH);
+
     /* Fill screen with black */
     SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
     SDL_RenderClear(renderer);

Xcode-iOS/Demos/src/touch.c

@@ -82,6 +82,7 @@ main(int argc, char *argv[])
     SDL_Window *window;         /* main window */
     SDL_Renderer *renderer;
     int done;                   /* does user want to quit? */
+    int w, h;
 
     /* initialize SDL */
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
@@ -89,11 +90,12 @@ main(int argc, char *argv[])
     }
 
     /* create main window and renderer */
-    window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
-                                SDL_WINDOW_OPENGL |
-                                SDL_WINDOW_BORDERLESS);
+    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALLOW_HIGHDPI);
     renderer = SDL_CreateRenderer(window, 0, 0);
 
+    SDL_GetWindowSize(window, &w, &h);
+    SDL_RenderSetLogicalSize(renderer, w, h);
+
     /* load brush texture */
     initializeTexture(renderer);