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SDL: Fix pointer aliasing warning

This commit is contained in:
Jeffrey Pfau 2015-04-21 02:28:14 -07:00
parent 657bcec879
commit 0fbba68b02
1 changed files with 12 additions and 9 deletions
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21
src/platform/sdl/sdl-events.c
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@ -498,13 +498,16 @@ static void _GBASDLRotationSample(struct GBARotationSource* source) {
int x = SDL_JoystickGetAxis(rotation->p->joystick, rotation->gyroX);
int y = SDL_JoystickGetAxis(rotation->p->joystick, rotation->gyroY);
float theta = atan2f(y, x) - atan2f(rotation->oldY, rotation->oldX);
if (isnan(theta)) {
theta = 0.0f;
} else if (theta > M_PI) {
theta -= 2.0f * M_PI;
} else if (theta < -M_PI) {
theta += 2.0f * M_PI;
union {
float f;
int32_t i;
} theta = { .f = atan2f(y, x) - atan2f(rotation->oldY, rotation->oldX) };
if (isnan(theta.f)) {
theta.f = 0.0f;
} else if (theta.f > M_PI) {
theta.f -= 2.0f * M_PI;
} else if (theta.f < -M_PI) {
theta.f += 2.0f * M_PI;
}
rotation->oldX = x;
rotation->oldY = y;
@ -513,6 +516,6 @@ static void _GBASDLRotationSample(struct GBARotationSource* source) {
if (CircleBufferSize(&rotation->zHistory) == GYRO_STEPS * sizeof(float)) {
CircleBufferRead32(&rotation->zHistory, (int32_t*) &oldZ);
}
CircleBufferWrite32(&rotation->zHistory, *(int32_t*) &theta);
rotation->zDelta += theta - oldZ;
CircleBufferWrite32(&rotation->zHistory, theta.i);
rotation->zDelta += theta.f - oldZ;
}