framerate.hpp

   1 #ifndef _framerate__hpp__included__
   2 #define _framerate__hpp__included__
   3
   4 #include <cstdint>
   5
   6 /**
   7  * \brief Nominal framerate of NTSC SNES.
   8  */
   9 #define FRAMERATE_SNES_NTSC (10738636.0/178683.0)
  10 /**
  11  * \brief Nominal framerate of PAL SNES.
  12  */
  13 #define FRAMERATE_SNES_PAL (322445.0/6448.0)
  14
  15 /**
  16  * \brief Set the nominal framerate
  17  *
  18  * Sets the nominal frame rate. Framerate limiting tries to maintain the nominal framerate when there is no other
  19  * explict framerate to maintain.
  20  */
  21 void set_nominal_framerate(double fps) throw();
  22
  23 /**
  24  * \brief Get the current realized framerate.
  25  *
  26  * Returns the current realized framerate.
  27  *
  28  * \return The framerate the system is currently archiving.
  29  */
  30 double get_framerate() throw();
  31
  32 /**
  33  * \brief ACK frame start.
  34  *
  35  * Acknowledge frame start for timing purposes.
  36  *
  37  * \param msec Current time.
  38  */
  39 void ack_frame_tick(uint64_t msec) throw();
  40
  41 /**
  42  * \brief Obtain how long to wait for next frame.
  43  *
  44  * Computes the number of milliseconds to wait for next frame.
  45  *
  46  * \param msec Current time.
  47  * \return Number of more milliseconds to wait.
  48  */
  49 uint64_t to_wait_frame(uint64_t msec) throw();
  50
  51 #endif