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Diffstat (limited to 'src/sdl2gfx/SDL2_framerate.cpp')
| -rw-r--r-- | src/sdl2gfx/SDL2_framerate.cpp | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/src/sdl2gfx/SDL2_framerate.cpp b/src/sdl2gfx/SDL2_framerate.cpp deleted file mode 100644 index e03a8ba7c..000000000 --- a/src/sdl2gfx/SDL2_framerate.cpp +++ /dev/null @@ -1,211 +0,0 @@ -/* - -SDL2_framerate.c: framerate manager - -Copyright (C) 2012-2014 Andreas Schiffler - -This software is provided 'as-is', without any express or implied -warranty. In no event will the authors be held liable for any damages -arising from the use of this software. - -Permission is granted to anyone to use this software for any purpose, -including commercial applications, and to alter it and redistribute it -freely, subject to the following restrictions: - -1. The origin of this software must not be misrepresented; you must not -claim that you wrote the original software. If you use this software -in a product, an acknowledgment in the product documentation would be -appreciated but is not required. - -2. Altered source versions must be plainly marked as such, and must not be -misrepresented as being the original software. - -3. This notice may not be removed or altered from any source -distribution. - -Andreas Schiffler -- aschiffler at ferzkopp dot net - -Changed for ManaPlus (C) 2013-2017 ManaPlus developers - -*/ - -#include "sdl2gfx/SDL2_framerate.h" - -#include "debug.h" - -/*! -\brief Internal wrapper to SDL_GetTicks that ensures a non-zero return value. - -\return The tick count. -*/ -static Uint32 _getTicks() -{ - Uint32 ticks = SDL_GetTicks(); - - /* - * Since baseticks!=0 is used to track initialization - * we need to ensure that the tick count is always >0 - * since SDL_GetTicks may not have incremented yet and - * return 0 depending on the timing of the calls. - */ - if (ticks == 0) - { - return 1; - } - else - { - return ticks; - } -} - -/*! -\brief Initialize the framerate manager. - -Initialize the framerate manager, set default framerate of 30Hz and -reset delay interpolation. - -\param manager Pointer to the framerate manager. -*/ -void SDL_initFramerate(FPSmanager * manager) -{ - /* - * Store some sane values - */ - manager->framecount = 0; - manager->rate = FPS_DEFAULT; - manager->rateticks = (1000.0f / static_cast<float>(FPS_DEFAULT)); - manager->baseticks = _getTicks(); - manager->lastticks = manager->baseticks; - -} - -/*! -\brief Set the framerate in Hz - -Sets a new framerate for the manager and reset delay interpolation. -Rate values must be between FPS_LOWER_LIMIT and FPS_UPPER_LIMIT inclusive to be accepted. - -\param manager Pointer to the framerate manager. -\param rate The new framerate in Hz (frames per second). - -\return 0 for sucess and -1 for error. -*/ -int SDL_setFramerate(FPSmanager * manager, Uint32 rate) -{ - if ((rate >= FPS_LOWER_LIMIT) && (rate <= FPS_UPPER_LIMIT)) - { - manager->framecount = 0; - manager->rate = rate; - manager->rateticks = (1000.0f / static_cast<float>(rate)); - return (0); - } - else - { - return (-1); - } -} - -/*! -\brief Return the current target framerate in Hz - -Get the currently set framerate of the manager. - -\param manager Pointer to the framerate manager. - -\return Current framerate in Hz or -1 for error. -*/ -int SDL_getFramerate(FPSmanager * manager) -{ - if (manager == nullptr) - { - return (-1); - } - else - { - return (static_cast<int>(manager->rate)); - } -} - -/*! -\brief Return the current framecount. - -Get the current framecount from the framerate manager. -A frame is counted each time SDL_framerateDelay is called. - -\param manager Pointer to the framerate manager. - -\return Current frame count or -1 for error. -*/ -int SDL_getFramecount(FPSmanager * manager) -{ - if (manager == nullptr) - { - return (-1); - } - else - { - return (static_cast<int>(manager->framecount)); - } -} - -/*! -\brief Delay execution to maintain a constant framerate and calculate fps. - -Generate a delay to accomodate currently set framerate. Call once in the -graphics/rendering loop. If the computer cannot keep up with the rate (i.e. -drawing too slow), the delay is zero and the delay interpolation is reset. - -\param manager Pointer to the framerate manager. - -\return The time that passed since the last call to the function in ms. May return 0. -*/ -Uint32 SDL_framerateDelay(FPSmanager * manager) -{ - Uint32 current_ticks; - Uint32 target_ticks; - Uint32 the_delay; - Uint32 time_passed = 0; - - /* - * No manager, no delay - */ - if (manager == nullptr) - { - return 0; - } - - /* - * Initialize uninitialized manager - */ - if (manager->baseticks == 0) - { - SDL_initFramerate(manager); - } - - /* - * Next frame - */ - manager->framecount++; - - /* - * Get/calc ticks - */ - current_ticks = _getTicks(); - time_passed = current_ticks - manager->lastticks; - manager->lastticks = current_ticks; - target_ticks = manager->baseticks + static_cast<Uint32>(static_cast<float>( - manager->framecount) * manager->rateticks); - - if (current_ticks <= target_ticks) - { - the_delay = target_ticks - current_ticks; - SDL_Delay(the_delay); - } - else - { - manager->framecount = 0; - manager->baseticks = _getTicks(); - } - - return time_passed; -} |