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Fixed Y axis inversion on iOS; positive is up, negative is down.

This commit is contained in:
Sam Lantinga 2013-10-20 22:23:09 -07:00
parent 08fa8da77c
commit 85c2e2367c
2 changed files with 12 additions and 9 deletions
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19
Xcode-iOS/Demos/src/accelerometer.c
View File

@ -31,19 +31,19 @@ static SDL_Texture *ship = 0; /* texture for spaceship */
static SDL_Texture *space = 0; /* texture for space (background */
void
render(SDL_Renderer *renderer)
render(SDL_Renderer *renderer, int w, int h)
{
/* get joystick (accelerometer) axis values and normalize them */
float ax = SDL_JoystickGetAxis(accelerometer, 0);
float ay = -SDL_JoystickGetAxis(accelerometer, 1);
float ay = SDL_JoystickGetAxis(accelerometer, 1);
/* ship screen constraints */
Uint32 minx = 0.0f;
Uint32 maxx = SCREEN_WIDTH - shipData.rect.w;
Uint32 maxx = w - shipData.rect.w;
Uint32 miny = 0.0f;
Uint32 maxy = SCREEN_HEIGHT - shipData.rect.h;
Uint32 maxy = h - shipData.rect.h;
#define SINT16_MAX ((float)(0x7FFF))
@ -162,8 +162,9 @@ main(int argc, char *argv[])
SDL_Renderer *renderer;
Uint32 startFrame; /* time frame began to process */
Uint32 endFrame; /* time frame ended processing */
Uint32 delay; /* time to pause waiting to draw next frame */
Sint32 delay; /* time to pause waiting to draw next frame */
int done; /* should we clean up and exit? */
int w, h;
/* initialize SDL */
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
@ -176,6 +177,8 @@ main(int argc, char *argv[])
SDL_WINDOW_BORDERLESS);
renderer = SDL_CreateRenderer(window, 0, 0);
SDL_GetWindowSize(window, &w, &h);
/* print out some info about joysticks and try to open accelerometer for use */
printf("There are %d joysticks available\n", SDL_NumJoysticks());
printf("Default joystick (index 0) is %s\n", SDL_JoystickName(0));
@ -196,8 +199,8 @@ main(int argc, char *argv[])
initializeTextures(renderer);
/* setup ship */
shipData.x = (SCREEN_WIDTH - shipData.rect.w) / 2;
shipData.y = (SCREEN_HEIGHT - shipData.rect.h) / 2;
shipData.x = (w - shipData.rect.w) / 2;
shipData.y = (h - shipData.rect.h) / 2;
shipData.vx = 0.0f;
shipData.vy = 0.0f;
@ -211,7 +214,7 @@ main(int argc, char *argv[])
done = 1;
}
}
render(renderer);
render(renderer, w, h);
endFrame = SDL_GetTicks();
/* figure out how much time we have left, and then sleep */

2
src/joystick/iphoneos/SDL_sysjoystick.m
View File

@ -106,7 +106,7 @@ SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
[[SDLUIAccelerationDelegate sharedDelegate] setHasNewData: NO];
SDL_PrivateJoystickAxis(joystick, 0, orientation[0]);
SDL_PrivateJoystickAxis(joystick, 1, orientation[1]);
SDL_PrivateJoystickAxis(joystick, 1, -orientation[1]);
SDL_PrivateJoystickAxis(joystick, 2, orientation[2]);
}