shithub: cstory

Info  •  Files  •  Log  •  Branches

Backends/Audio/SoftwareMixer: Optimized `fmod(x, 1.0)` to `x - trunc(x)`

Signed-off-by: Gabriel Ravier <gabravier@gmail.com>

--- a/src/Backends/Audio/SoftwareMixer.cpp

+++ b/src/Backends/Audio/SoftwareMixer.cpp

@@ -1,6 +1,6 @@

 #include "SoftwareMixer.h"

-#include <math.h>

+#include <cmath>

 #include <stddef.h>

 #include <stdio.h>

 #include <stdlib.h>

@@ -154,7 +154,7 @@

 				const float sample2 = (sound->samples[(size_t)sound->position + 1] - 128.0f) / 128.0f;

 				// Perform linear interpolation

-				const float interpolated_sample = sample1 + ((sample2 - sample1) * fmod(sound->position, 1.0));

+				const float interpolated_sample = sample1 + (sample2 - sample1) * (sound->position - std::trunc(sound->position));

 				*steam_pointer++ += interpolated_sample * sound->volume_l;

 				*steam_pointer++ += interpolated_sample * sound->volume_r;

@@ -165,7 +165,7 @@

 				{

 					if (sound->looping)

 					{

-						sound->position = fmod(sound->position, (double)sound->frames);

+						sound->position = std::fmod(sound->position, (double)sound->frames);

 					}

 					else

 					{