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Replaced NSDate time source with mach_absolute_time.

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This commit is contained in:
Camilla Berglund 2012-02-09 01:53:26 +01:00
parent 62e8d07f4f
commit 13a438c91e
4 changed files with 42 additions and 5 deletions
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1
readme.html
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@ -310,6 +310,7 @@ version of GLFW.</p>
<li>Bugfix: The FSAA test did not check for the availability of <code>GL_ARB_multisample</code></li>
<li>[Cocoa] Added support for OpenGL 3.2 core profile in 10.7 Lion and above</li>
<li>[Cocoa] Added support for joysticks</li>
<li>[Cocoa] Replaced <code>NSDate</code> time source with <code>mach_absolute_time</code></li>
<li>[Cocoa] Bugfix: The loop condition for saving video modes used the wrong index variable</li>
<li>[Cocoa] Bugfix: The OpenGL framework was not retrieved, making glfwGetProcAddress crash</li>
<li>[X11] Added support for the <code>GLX_EXT_swap_control</code> extension as an alternative to <code>GLX_SGI_swap_control</code></li>

2
src/cocoa_init.m
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@ -230,6 +230,8 @@ int _glfwPlatformInit(void)
_glfwPlatformGetGammaRamp(&_glfwLibrary.originalRamp);
_glfwLibrary.currentRamp = _glfwLibrary.originalRamp;
_glfwInitTimer();
_glfwInitJoysticks();
return GL_TRUE;

6
src/cocoa_platform.h
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@ -85,7 +85,8 @@ typedef struct _GLFWwindowNS
typedef struct _GLFWlibraryNS
{
struct {
double t0;
double base;
double resolution;
} timer;
// dlopen handle for dynamically loading OpenGL extension entry points
@ -101,6 +102,9 @@ typedef struct _GLFWlibraryNS
// Prototypes for platform specific internal functions
//========================================================================
// Time
void _glfwInitTimer(void);
// Joystick input
void _glfwInitJoysticks(void);
void _glfwTerminateJoysticks(void);

38
src/cocoa_time.m
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@ -29,6 +29,36 @@
#include "internal.h"
#include <mach/mach_time.h>
//========================================================================
// Return raw time
//========================================================================
static uint64_t getRawTime(void)
{
return mach_absolute_time();
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Initialise timer
//========================================================================
void _glfwInitTimer(void)
{
mach_timebase_info_data_t info;
mach_timebase_info(&info);
_glfwLibrary.NS.timer.resolution = (double) info.numer / (info.denom * 1.0e9);
_glfwLibrary.NS.timer.base = getRawTime();
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
@ -40,8 +70,8 @@
double _glfwPlatformGetTime(void)
{
return [NSDate timeIntervalSinceReferenceDate] -
_glfwLibrary.NS.timer.t0;
return (double) (getRawTime() - _glfwLibrary.NS.timer.base) *
_glfwLibrary.NS.timer.resolution;
}
//========================================================================
@ -50,7 +80,7 @@ double _glfwPlatformGetTime(void)
void _glfwPlatformSetTime(double time)
{
_glfwLibrary.NS.timer.t0 =
[NSDate timeIntervalSinceReferenceDate] - time;
_glfwLibrary.NS.timer.base = getRawTime() -
(uint64_t) (time / _glfwLibrary.NS.timer.resolution);
}