common.c File Reference

#include "common.h"
#include "SDL.h"
#include <stdlib.h>

Include dependency graph for common.c:

Go to the source code of this file.

Functions
int	randomInt (int min, int max)
float	randomFloat (float min, float max)
void	fatalError (const char *string)
double	updateDeltaTime (void)

Variables
static Uint64	prevTime = 0

Function Documentation

fatalError()

void fatalError

(

const char *

string

)

Definition at line 32 of file common.c.

References NULL, SDL_GetError, SDL_MESSAGEBOX_ERROR, and SDL_ShowSimpleMessageBox.

Referenced by initializeTexture(), initializeTextures(), loadSound(), and main().

{
    printf("%s: %s\n", string, SDL_GetError());
    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, string, SDL_GetError(), NULL);
    exit(1);
}

randomFloat()

float randomFloat	(	float	min,
		float	max
	)

Definition at line 26 of file common.c.

Referenced by explodeEmitter(), initializeHappyFaces(), and spawnTrailFromEmitter().

{
    return rand() / (float) RAND_MAX *(max - min) + min;
}

randomInt()

int randomInt	(	int	min,
		int	max
	)

Definition at line 16 of file common.c.

Referenced by render().

{
    return min + rand() % (max - min + 1);
}

updateDeltaTime()

double updateDeltaTime

(

void

)

Definition at line 42 of file common.c.

References prevTime, SDL_GetPerformanceCounter, and SDL_GetPerformanceFrequency().

Referenced by main().

{
    Uint64 curTime;
    double deltaTime;

    if (prevTime == 0) {
        prevTime = SDL_GetPerformanceCounter();
    }

    curTime = SDL_GetPerformanceCounter();
    deltaTime = (double) (curTime - prevTime) / (double) SDL_GetPerformanceFrequency();
    prevTime = curTime;

    return deltaTime;
}

Variable Documentation

prevTime

Uint64 prevTime = 0

static

Definition at line 39 of file common.c.

Referenced by updateDeltaTime().