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The target where an application runs is remarkably similar to your desktop machine: it has a file system that is about the same and roughly the same set of device nodes. These similarities make it possible to use your desktop machine as a reasonable emulator for your target board. Yes, the processor is different; but between the kernel and the development language, the difference apparent to you is small to nonexistent, depending on the nature of the application. There are some key differences, however, which fall into two large categories: language and system related. Language-related differences appear as a result of the development language used to build the code; system-related differences have to do with the Linux kernel and root file system. The target is slower than, has less memory than, has smaller fixed storage than, and probably doesn t have the same input and output features as the desktop. However, the interface to those resources is identical to what s on a desktop system. Because the interfaces are the same, the software can reasonably be run on both systems with similar results. The Linux kernel provides a uniform interface to resources that stays the same even if the kernel is running on a different processor. Similarly, when programming in C, you use the same function calls for printing, reading input, interprocess communication, and process control. Compiling the C code with a

background = pygame.image.load(background_image_filename).convert() sprite = pygame.image.load(sprite_image_filename).convert_alpha() clock = pygame.time.Clock() sprite_pos = Vector2(200, 150) sprite_speed = 300. while True: for event in pygame.event.get(): if event.type == QUIT: exit() pressed_keys = pygame.key.get_pressed() key_direction = Vector2(0, 0) if pressed_keys[K_LEFT]: key_direction.x = 1 elif pressed_keys[K_RIGHT]: key_direction.x = +1 if pressed_keys[K_UP]: key_direction.y = -1 elif pressed_keys[K_DOWN]: key_direction.y = +1 key_direction.normalize() screen.blit(background, (0,0)) screen.blit(sprite, sprite_pos) time_passed = clock.tick(30) time_passed_seconds = time_passed / 1000.0 sprite_pos += key_direction * sprite_speed * time_passed_seconds pygame.display.update() Listing 6-2 cheats a little in calculating the direction vector. It sets the x component to 1 or +1 if K_LEFT or K_RIGHT is pressed and the y component to 1 or +1 if K_UP or K_DOWN is pressed. This gives us the same result as adding two of the simple horizontal and vertical heading vectors together. If you ever see a mathematical shortcut that lets you do something with less code, feel free to try it out game developers find that they accumulate many such time-saving gems!

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Figure 11-48. Use the Upload dialog box to choose a file to upload to your shared folder. 2. Click the Browse button and then search for and double-click the file you want to upload. 3. Repeat this process for each file that you wish to upload.

Accessing the heap (or free store, for old schoolers) isn t a constant time operation. The malloc() call returns true, giving you a pointer for memory not yet allocated to the process. Only when you attempt to read or write to the memory address is the memory actually mapped into the process space, if necessary. Suppose you do something like this: void* pointers[100] int i; for (i=0; i < sizeof(pointers); i++) pointers[i] = malloc(1000); mlockall(MCL_CURRENT); Your intent to get and lock the memory just allocated is foiled by the fact that the pointers in the array haven t been mapped into your process space and therefore can t be locked. One way around this is to touch the memory and force its allocation: for (i=0; i < sizeof(pointers); i++) { pointers[i] = malloc(1000); memset(pointers[i], 0, 1000); }

Note If you change your mind about one or more of the files in the list you are about to upload to the

You may have noticed that there are only eight vectors used for this vector movement. If we were to precalculate these vectors and insert them into the code directly, we could reduce the amount of work done when running the script. It s worth doing as an exercise if you like a challenge, but since calculating the heading vector is only ever done once per frame, speeding it up will make no noticeable difference to the frame rate. Keep your eye out for situations like this; reducing the amount of work the game must do to creating a frame is called optimizing and gets more important when there is a lot of action on the screen.

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