Added SDL 1.2 multitouch example

project/jni/application/multitouch/AndroidAppSettings.cfg

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+# The application settings for Android libSDL port
+AppSettingVersion=17
+LibSdlVersion=1.2
+AppName="Example multitouch"
+AppFullName=org.libsdl.example.multitouch
+ScreenOrientation=h
+InhibitSuspend=n
+AppDataDownloadUrl="Game data is 1 Mb|ballfield2.zip"
+VideoDepthBpp=16
+NeedDepthBuffer=n
+NeedStencilBuffer=n
+NeedGles2=n
+SwVideoMode=y
+SdlVideoResize=y
+SdlVideoResizeKeepAspect=n
+CompatibilityHacks=n
+AppUsesMouse=y
+AppNeedsTwoButtonMouse=y
+ShowMouseCursor=n
+ForceRelativeMouseMode=n
+AppNeedsArrowKeys=n
+AppNeedsTextInput=y
+AppUsesJoystick=y
+AppHandlesJoystickSensitivity=n
+AppUsesMultitouch=y
+NonBlockingSwapBuffers=n
+RedefinedKeys="SPACE RETURN NO_REMAP NO_REMAP SPACE ESCAPE"
+AppTouchscreenKeyboardKeysAmount=0
+AppTouchscreenKeyboardKeysAmountAutoFire=0
+RedefinedKeysScreenKb="1 2 3 4 5 6 1 2 3 4"
+StartupMenuButtonTimeout=3000
+HiddenMenuOptions='OptionalDownloadConfig'
+FirstStartMenuOptions=''
+MultiABI=n
+AppVersionCode=101
+AppVersionName="1.01"
+ResetSdlConfigForThisVersion=n
+CompiledLibraries="sdl_mixer sdl_image"
+CustomBuildScript=n
+AppCflags='-O2 -finline-functions'
+AppLdflags=''
+AppSubdirsBuild=''
+AppCmdline=''
+ReadmeText='^Readme text'

project/jni/application/multitouch/example.cpp

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+
+#include <android/log.h>
+#include "SDL.h"
+
+
+int main(int argc, char* argv[])
+{
+    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_JOYSTICK);
+    SDL_Surface * screen = SDL_SetVideoMode(640, 480, 16, 0);
+
+    enum { MAX_POINTERS = 16, PTR_PRESSED = 4 };
+    int touchPointers[MAX_POINTERS][5];
+    int accel[5];
+    int i;
+
+    memset(touchPointers, 0, sizeof(touchPointers));
+    memset(accel, 0, sizeof(accel));
+    SDL_Joystick * joysticks[MAX_POINTERS+1];
+    for(i=0; i<MAX_POINTERS; i++)
+        joysticks[i] = SDL_JoystickOpen(i);
+
+    while(1)
+    {
+        SDL_Event evt;
+        while( SDL_PollEvent(&evt) )
+        {
+            if( evt.type == SDL_JOYAXISMOTION )
+            {
+                if( evt.jaxis.which == 0 ) // 0 = The accelerometer
+                {
+                    accel[evt.jaxis.axis] = evt.jaxis.value;
+                    continue;
+                }
+                int joyid = evt.jaxis.which - 1;
+                touchPointers[joyid][evt.jaxis.axis] = evt.jaxis.value; // Axis 0 and 1 are coordinates, 2 and 3 are pressure and touch point radius
+            }
+            if( evt.type == SDL_JOYBUTTONDOWN || evt.type == SDL_JOYBUTTONUP )
+            {
+                if( evt.jbutton.which == 0 ) // 0 = The accelerometer
+                    continue;
+                int joyid = evt.jbutton.which - 1;
+                touchPointers[joyid][PTR_PRESSED] = (evt.jbutton.state == SDL_PRESSED);
+            }
+            if(evt.type == SDL_KEYDOWN && evt.key.keysym.sym == SDLK_ESCAPE)
+                return 0;
+        }
+        SDL_FillRect(screen, 0, 0);
+        SDL_Rect r;
+        for(i=0; i<MAX_POINTERS; i++)
+        {
+            if( !touchPointers[i][PTR_PRESSED] )
+                continue;
+            r.x = touchPointers[i][0];
+            r.y = touchPointers[i][1];
+            r.w = 80 + touchPointers[i][2] / 10; // Pressure
+            r.h = 80 + touchPointers[i][3] / 10; // Touch point size
+            r.x -= r.w/2;
+            r.y -= r.h/2;
+            SDL_FillRect(screen, &r, 0xffffff);
+        }
+        r.x = 320 + accel[0] / 100;
+        r.y = 240 + accel[1] / 100;
+        r.w = 10 + abs(accel[2]);
+        r.h = 10;
+        r.x -= r.w/2;
+        r.y -= r.h/2;
+        __android_log_print(ANDROID_LOG_INFO, "Example", "Accelerometer %06d %06d %06d", accel[0], accel[1], accel[2]);
+        SDL_FillRect(screen, &r, 0xaaaaaa);
+        SDL_Flip(screen);
+    }
+    return 0;
+}