Name | egl_nv_system_time |
Name Strings | EGL_NV_system_time |
Contact | NVIDIA Corporation (NVPerfHUDESDev@nvidia.com) |
Dependencies | Requires EGL 1.2. |
Overview | This extension exposes an alternative method of querying the system time from the driver instead of the operating system. |
Issues | Add 64 bit types?
Yes, EGL doesn't support any 64 bit types, so this extension adds int64 and uint64 types.
|
New Types |
typedef long long int EGLint64NV; |
New Procedures and Functions |
EGLuint64NV eglGetSystemTimeFrequencyNV(void); |
New Tokens | None. |
Description | The command:
Returns the frequency of the system timer, in counts per second. The frequency will not change while the system is running.EGLuint64NV eglGetSystemTimeFrequencyNV(void); The command: Returns the current value of the system timer. The system time in seconds can be calculated by dividing the returned value by the frequency returned by theEGLuint64NV eglGetSystemTimeNV(void); GetSystemTimeFrequencyNV command. Multiple calls to GetSystemTimeNV may return the same values, applications need to be careful to avoid divide by zero errors when using the interval calculated from successive GetSystemTimeNV calls.
|
Usage Example |
EGLuint64NV frequency = eglGetSystemTimeFrequencyNV(); loop { EGLuint64NV start = eglGetSystemTimeNV() / frequency; // draw EGLuint64NV end = eglGetSystemTimeNV() / frequency; EGLuint64NV interval = end - start; if (interval > 0) update_animation(interval); eglSwapBuffers(dpy, surface); } |
NVIDIA® GameWorks™ Documentation Rev. 1.0.211026 ©2014-2021. NVIDIA Corporation and affiliates. All Rights Reserved.