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Added SDL_modf() and SDL_modff()

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This function is useful for accumulating relative mouse motion if you want to only handle whole pixel movement.
e.g.
static float dx_frac, dy_frac;
float dx, dy;

/* Accumulate new motion with previous sub-pixel motion */
dx = event.motion.xrel + dx_frac;
dy = event.motion.yrel + dy_frac;

/* Split the integral and fractional motion, dx and dy will contain whole pixel deltas */
dx_frac = SDL_modff(dx, &dx);
dy_frac = SDL_modff(dy, &dy);
if (dx != 0.0f || dy != 0.0f) {
    ...
}
This commit is contained in:
Sam Lantinga 2022-12-29 21:39:08 -08:00
parent ead4f122e4
commit 7f23d71b6a
20 changed files with 149 additions and 7 deletions
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27
test/testautomation_math.c
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@ -1272,6 +1272,24 @@ log10_regularCases(void *args)
return helper_dtod_inexact("Log10", SDL_log10, regular_cases, SDL_arraysize(regular_cases));
}
/* SDL_modf tests functions */
static int
modf_baseCases(void *args)
{
double fractional, integral;
fractional = SDL_modf(1.25, &integral);
SDLTest_AssertCheck(integral == 1.0,
"modf(%f), expected integral %f, got %f",
1.25, 1.0, integral);
SDLTest_AssertCheck(fractional == 0.25,
"modf(%f), expected fractional %f, got %f",
1.25, 0.25, fractional);
return TEST_COMPLETED;
}
/* SDL_pow tests functions */
/* Tests with positive and negative infinities as exponents */
@ -3004,6 +3022,13 @@ static const SDLTest_TestCaseReference log10TestRegular = {
"Checks a set of regular values", TEST_ENABLED
};
/* SDL_modf test cases */
static const SDLTest_TestCaseReference modfTestBase = {
(SDLTest_TestCaseFp)modf_baseCases, "modf_baseCases",
"Checks the base cases", TEST_ENABLED
};
/* SDL_pow test cases */
static const SDLTest_TestCaseReference powTestExpInf1 = {
@ -3315,6 +3340,8 @@ static const SDLTest_TestCaseReference *mathTests[] = {
&log10TestLimit, &log10TestNan,
&log10TestBase, &log10TestRegular,
&modfTestBase,
&powTestExpInf1, &powTestExpInf2, &powTestExpInf3,
&powTestBaseInf1, &powTestBaseInf2,
&powTestNan1, &powTestNan2, &powTestNan3, &powTestNan4,