anki-3d-engine/src/Util/Input.cpp

#include <SDL.h>
#include "Input.h"
#include "Renderer.h"


namespace I {



//======================================================================================================================
// VARS                                                                                                                =
//======================================================================================================================
Vec<short> keys(SDL_NUM_SCANCODES, 0);
Vec<short> mouseBtns(8, 0);
Vec2 mousePosNdc;
Vec2 mousePos;
Vec2 mouseVelocity;

bool warpMouse = false;
bool hideCursor = true;


//======================================================================================================================
// reset                                                                                                               =
//======================================================================================================================
void reset(void)
{
	DEBUG_ERR(keys.size() < 1);
	DEBUG_ERR(mouseBtns.size() < 1);
	memset(&keys[0], 0, keys.size()*sizeof(short));
	memset(&mouseBtns[0], 0, mouseBtns.size()*sizeof(short));
	mousePosNdc.setZero();
	mouseVelocity.setZero();
}


/*
=======================================================================================================================================
handleEvents                                                                                                           =
=======================================================================================================================================
*/
void handleEvents()
{
	if(hideCursor) SDL_ShowCursor(SDL_DISABLE);
	else             SDL_ShowCursor(SDL_ENABLE);

	// add the times a key is bying pressed
	for(uint x=0; x<keys.size(); x++)
	{
		if(keys[x]) ++keys[x];
	}
	for(int x=0; x<8; x++)
	{
		if(mouseBtns[x]) ++mouseBtns[x];
	}


	mouseVelocity.setZero();

	SDL_Event event_;
	while(SDL_PollEvent(&event_))
	{
		switch(event_.type)
		{
			case SDL_KEYDOWN:
				keys[event_.key.keysym.scancode] = 1;
				break;

			case SDL_KEYUP:
				keys[event_.key.keysym.scancode] = 0;
				break;

			case SDL_MOUSEBUTTONDOWN:
				mouseBtns[event_.button.button] = 1;
				break;

			case SDL_MOUSEBUTTONUP:
				mouseBtns[event_.button.button] = 0;
				break;

			case SDL_MOUSEMOTION:
			{
				Vec2 prevMousePosNdc(mousePosNdc);

				mousePos.x = event_.button.x;
				mousePos.y = event_.button.y;

				mousePosNdc.x = (2.0 * mousePos.x) / (float)app->getWindowWidth() - 1.0;
				mousePosNdc.y = 1.0 - (2.0 * mousePos.y) / (float)app->getWindowHeight();

				if(warpMouse)
				{
					// the SDL_WarpMouse pushes an event in the event queue. This check is so we wont process the event of the...
					// ...SDL_WarpMouse function
					if(mousePosNdc == Vec2::getZero()) break;

					SDL_WarpMouse(app->getWindowWidth()/2, app->getWindowHeight()/2);
				}

				mouseVelocity = mousePosNdc - prevMousePosNdc;
				break;
			}

			case SDL_QUIT:
				app->quit(1);
				break;
		}
	}

	//cout << fixed << " velocity: " << mouseVelocity.x() << ' ' << mouseVelocity.y() << endl;
	//cout << fixed << mousePosNdc.x() << ' ' << mousePosNdc.y() << endl;
	//cout << crnt_keys[SDLK_m] << ' ' << prev_keys[SDLK_m] << "      " << keys[SDLK_m] << endl;
	//cout << mouseBtns[SDL_BUTTON_LEFT] << endl;

}



} // end namespace