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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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2
src/dynapi/SDL_dynapi.sym
View File

@@ -859,6 +859,8 @@ SDL3_0.0.0 {
SDL_wcsncasecmp;
SDL_wcsncmp;
SDL_wcsstr;
SDL_modf;
SDL_modff;
# extra symbols go here (don't modify this line)
local: *;
};

2
src/dynapi/SDL_dynapi_overrides.h
View File

@@ -887,3 +887,5 @@
#define SDL_wcsstr SDL_wcsstr_REAL
/* New API symbols are added at the end */
#define SDL_modf SDL_modf_REAL
#define SDL_modff SDL_modff_REAL

2
src/dynapi/SDL_dynapi_procs.h
View File

@@ -932,3 +932,5 @@ SDL_DYNAPI_PROC(int,SDL_wcsncmp,(const wchar_t *a, const wchar_t *b, size_t c),(
SDL_DYNAPI_PROC(wchar_t*,SDL_wcsstr,(const wchar_t *a, const wchar_t *b),(a,b),return)
/* New API symbols are added at the end */
SDL_DYNAPI_PROC(double,SDL_modf,(double a, double *b),(a,b),return)
SDL_DYNAPI_PROC(float,SDL_modff,(float a, float *b),(a,b),return)