Add strafing

src/sdl.c

@@ -60,7 +60,7 @@ int main(int argc, char* argv[]) {
 
     bool quit = false;
     Uint32 time = SDL_GetTicks();
-    float x = 0, y = 0;
+    float x = 0, y = 0, z = 0;
     while(!quit) {
         SDL_Event event;
         while(SDL_PollEvent(&event)) {
@@ -68,6 +68,12 @@ int main(int argc, char* argv[]) {
                 case SDL_KEYUP:
                 case SDL_KEYDOWN:
                     switch(event.key.keysym.scancode) {
+                        case SDL_SCANCODE_Q:
+                            z = event.type == SDL_KEYUP ? 0 : 250;
+                            break;
+                        case SDL_SCANCODE_E:
+                            z = event.type == SDL_KEYUP ? 0 : -250;
+                            break;
                         case SDL_SCANCODE_LEFT:
                         case SDL_SCANCODE_A:
                             x = event.type == SDL_KEYUP ? 0 : 250;
@@ -98,7 +104,7 @@ int main(int argc, char* argv[]) {
 	{
             time = currtime;
             sdk_heartbeat(client);
-            float w1 = y + x, w2 = y - x, w3 = y - x, w4 = y + x;
+            float w1 = y + x + z, w2 = y - x -z, w3 = y + x -z, w4 = y - x + z;
             set_wheel_speed(client, w1, -w2, -w3, w4);
 	}
     }