williamjcm/raycastlib
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Add benchmark

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This commit is contained in:
Miloslav Číž 2018-08-31 11:20:36 +02:00
parent 964d22467d
commit 5ee1c370dc
2 changed files with 42 additions and 15 deletions
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2
raycastlib.h
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@ -245,7 +245,6 @@ void castRaySquare(Ray localRay, Vector2D *nextCellOffset,
collisionPointOffset->c2 = \ collisionPointOffset->c2 = \
(((int32_t) collisionPointOffset->c1) * localRay.direction.c2) /\ (((int32_t) collisionPointOffset->c1) * localRay.direction.c2) /\
((localRay.direction.c1 == 0) ? 1 : localRay.direction.c1);\ ((localRay.direction.c1 == 0) ? 1 : localRay.direction.c1);\
Unit nextC2 = localRay.start.c2 + collisionPointOffset->c2;\
} }
#define helper2(n1,n2,c)\ #define helper2(n1,n2,c)\
@ -355,6 +354,7 @@ void castRayMultiHit(Ray ray, int16_t (*arrayFunc)(int16_t, int16_t),
currentSquare.x += no.x; currentSquare.x += no.x;
currentSquare.y += no.y; currentSquare.y += no.y;
// offset into the next cell
currentPos.x += co.x; currentPos.x += co.x;
currentPos.y += co.y; currentPos.y += co.y;
} }

55
test.c
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@ -6,7 +6,7 @@
#include <stdio.h> #include <stdio.h>
#include "raycastlib.h" #include "raycastlib.h"
#include <time.h> #include <sys/time.h>
int16_t testArrayFunc(int16_t x, int16_t y) int16_t testArrayFunc(int16_t x, int16_t y)
{ {
@ -55,6 +55,42 @@ int testSingleRay(Unit startX, Unit startY, Unit dirX, Unit dirY,
return result; return result;
} }
// returns milliseconds
long measureTime(void (*func)(void))
{
long start, end;
struct timeval timecheck;
gettimeofday(&timecheck, NULL);
start = (long) timecheck.tv_sec * 1000 + (long) timecheck.tv_usec / 1000;
func();
gettimeofday(&timecheck, NULL);
end = (long) timecheck.tv_sec * 1000 + (long) timecheck.tv_usec / 1000;
return end - start;
}
void benchCastRays()
{
Ray r;
r.start.x = UNITS_PER_SQUARE + UNITS_PER_SQUARE / 2;
r.start.y = 2 * UNITS_PER_SQUARE + UNITS_PER_SQUARE / 4;
Vector2D directions[8];
for (int i = 0; i < 8; ++i)
directions[i] = angleToDirection(UNITS_PER_SQUARE / 8 * i);
for (int i = 0; i < 1000000; ++i)
{
r.direction = directions[i % 8];
castRay(r,testArrayFunc,30);
}
}
int main() int main()
{ {
printf("Testing raycastlib.\n"); printf("Testing raycastlib.\n");
@ -100,18 +136,9 @@ int main()
printf("benchmark:\n"); printf("benchmark:\n");
time_t start,end; long t;
double dif; t = measureTime(benchCastRays);
printf("cast 1000000 rays: %ld ms\n",t);
time (&start);
for (int i = 0; i < 1000; ++i)
printf("*");
time (&end);
dif = difftime (end,start);
printf ("Your calculations took %.2lf seconds to run.\n", dif );
return 0; return 0;
} }