Mercurial > sdl-ios-xcode
view test/testloadso.c @ 3496:78fc8ea578b2
Joe 2009-11-23 21:31:10 PST
If type is ::SDL_HAPTIC_CARTESIAN, direction is encoded by three positions
367 * (X axis, Y axis and Z axis (with 3 axes)). ::SDL_HAPTIC_CARTESIAN
uses
368 * the first three \c dir parameters. The cardinal directions would
be:
369 * - North: 0,-1, 0
370 * - East: -1, 0, 0
371 * - South: 0, 1, 0
372 * - West: 1, 0, 0
typedef struct SDL_HapticDirection
{
Uint8 type; /**< The type of encoding. */
Uint16 dir[3]; /**< The encoded direction. */
} SDL_HapticDirection;
An unsigned int can't store negative values and I don't see an alternate way to
encode them in the docs or source. The best I have been able to come up with is
using a negative magnitude for the effect but this will only get me 2 of the 4
quadrants in the plane for 2d effects. I looked at the win32 and linux
implementations and I believe is is safe to use signed ints in the direction
struct. I am unfamiliar with the darwin haptics API so I don't know if it is
safe.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 27 Nov 2009 19:29:27 +0000 |
parents | 9de326b3099c |
children |
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/* Test program to test dynamic loading with the loadso subsystem. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL.h" typedef int (*fntype) (const char *); int main(int argc, char *argv[]) { int retval = 0; int hello = 0; const char *libname = NULL; const char *symname = NULL; void *lib = NULL; fntype fn = NULL; if (argc != 3) { const char *app = argv[0]; fprintf(stderr, "USAGE: %s <library> <functionname>\n", app); fprintf(stderr, " %s --hello <lib with puts()>\n", app); return 1; } /* Initialize SDL */ if (SDL_Init(0) < 0) { fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); return 2; } if (strcmp(argv[1], "--hello") == 0) { hello = 1; libname = argv[2]; symname = "puts"; } else { libname = argv[1]; symname = argv[2]; } lib = SDL_LoadObject(libname); if (lib == NULL) { fprintf(stderr, "SDL_LoadObject('%s') failed: %s\n", libname, SDL_GetError()); retval = 3; } else { fn = (fntype) SDL_LoadFunction(lib, symname); if (fn == NULL) { fprintf(stderr, "SDL_LoadFunction('%s') failed: %s\n", symname, SDL_GetError()); retval = 4; } else { printf("Found %s in %s at %p\n", symname, libname, fn); if (hello) { printf("Calling function...\n"); fflush(stdout); fn(" HELLO, WORLD!\n"); printf("...apparently, we survived. :)\n"); printf("Unloading library...\n"); fflush(stdout); } } SDL_UnloadObject(lib); } SDL_Quit(); return (0); }