Initial Mercurial commit.

src/modules/timer/sdl/Timer.cpp

@@ -0,0 +1,94 @@
+/**
+* Copyright (c) 2006-2009 LOVE Development Team
+* 
+* 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.
+**/
+
+#include "Timer.h"
+
+namespace love
+{
+namespace timer
+{
+namespace sdl
+{
+	Timer::Timer()
+		: time_init(0), currTime(0), prevFpsUpdate(0), fps(0), fpsUpdateFrequency(1), 
+		frames(0), dt(0)
+	{
+		// Init the SDL timer system.
+		if(SDL_InitSubSystem(SDL_INIT_TIMER) < 0)
+			throw Exception(SDL_GetError());
+	}
+
+	Timer::~Timer()
+	{
+		// Quit SDL timer.
+		SDL_QuitSubSystem(SDL_INIT_TIMER);
+	}
+
+	const char * Timer::getName() const
+	{
+		return "love.timer.sdl";
+	}
+
+	void Timer::step()
+	{
+		// Frames rendered
+		frames++;
+			
+		// "Current" time is previous time by now.
+		prevTime = currTime;
+
+		// Get ticks from SDL
+		currTime = SDL_GetTicks();
+
+		// Convert to number of seconds
+		dt = (currTime - prevTime)/1000.0f;
+
+		// Update FPS?
+		if((currTime - prevFpsUpdate)/1000.0f > fpsUpdateFrequency)
+		{
+			fps = frames/fpsUpdateFrequency;
+			prevFpsUpdate = currTime;
+			frames = 0;
+		}
+	}
+
+	void Timer::sleep(unsigned int ms)
+	{
+		SDL_Delay(ms);
+	}
+
+	float Timer::getDelta() const
+	{
+		return dt;
+	}
+
+	float Timer::getFPS() const
+	{
+		return fps;
+	}
+
+	float Timer::getTime() const
+	{
+		return (SDL_GetTicks() - time_init)/1000.0f;
+	}
+
+} // sdl
+} // timer
+} // love