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Use datatype monotonic_t instead of double to keep track of time

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The time is stored in a signed 64 bit integer with nanosecond accuracy. This eliminates the possibility of floating-point inaccuracies.
`monotonic_t` can currently hold values large enough to work correctly for more than 200 years into the future.
Using a typedef instead of directly using `int64_t` everywhere will also allow easily changing the datatype in the future should the need arise for more precise or bigger time values.
This commit is contained in:
Luflosi
2019-08-02 11:49:02 -05:00
parent 4ec1a8d9c3
commit f3b9ff5f9f
33 changed files with 298 additions and 243 deletions
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17
glfw/input.c vendored
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@@ -28,6 +28,7 @@
//========================================================================
#include "internal.h"
#include "../kitty/monotonic.h"
#include <assert.h>
#include <float.h>
@@ -1477,25 +1478,23 @@ GLFWAPI const char* glfwGetPrimarySelectionString(GLFWwindow* handle UNUSED)
}
#endif
GLFWAPI double glfwGetTime(void)
GLFWAPI monotonic_t glfwGetTime(void)
{
_GLFW_REQUIRE_INIT_OR_RETURN(0.0);
return (double) (_glfwPlatformGetTimerValue() - _glfw.timer.offset) /
_glfwPlatformGetTimerFrequency();
_GLFW_REQUIRE_INIT_OR_RETURN(0);
return monotonic();
}
GLFWAPI void glfwSetTime(double time)
GLFWAPI void glfwSetTime(monotonic_t time)
{
_GLFW_REQUIRE_INIT();
if (time != time || time < 0.0 || time > 18446744073.0)
if (time < 0)
{
_glfwInputError(GLFW_INVALID_VALUE, "Invalid time %f", time);
_glfwInputError(GLFW_INVALID_VALUE, "Invalid time %f", monotonic_t_to_s_double(time));
return;
}
_glfw.timer.offset = _glfwPlatformGetTimerValue() -
(uint64_t) (time * _glfwPlatformGetTimerFrequency());
// Do nothing
}
GLFWAPI uint64_t glfwGetTimerValue(void)