Loop for set count instead of time

common.h

@@ -18,6 +18,7 @@
 #define WANDERER_SPEEDUP_FACTOR 2.0f
 #define MSG_BUF_LEN 4096
 #define LINE_BUF_LEN 1024
+#define LOOPS 100
 
 #define abs(A) (A < 0 ? A * -1 : A)
 #define min(A, B) (A < B ? A : B)

dod.c

@@ -5,7 +5,6 @@
 #include <stdbool.h>
 #include <assert.h>
 #include <string.h>
-#include <time.h>
 
 #define MOVABLE_TAG_SHIFT     0
 #define RENDERABLE_TAG_SHIFT  1
@@ -66,12 +65,12 @@ void init_scale_wanderer(Scale *scale, XOR256State *state);
 void init_scale_zone(Scale *scale, XOR256State *state);
 void init_velocity(Velocity *velocity, XOR256State *state);
 void zero_velocity(Velocity *velocity, XOR256State *state);
-void update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f32 delta);
+u64 update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f32 delta);
 void render_entities(const u8 *tags, const Rect *rects, u64 count);
 u8 collides(const Rect *rect, const Rect *collider);
 i16 get_random_velocity(XOR256State *state);
 
-void log_data(const Rect *rects, u64 count, FILE *fp, char *line);
+u64 log_data(const Rect *rects, u64 count, FILE *fp, char *line);
 
 int main(void) {
   Allocator arena = wapp_mem_arena_allocator_init(MB(20));
@@ -99,21 +98,22 @@ int main(void) {
   FILE *fp = fopen("dod.out", "w");
   assert(fp != NULL);
 
-  time_t start   = time(NULL);
+  u64 update_counter = 0;
-  time_t elapsed = (time_t)-1;
+  u64 render_counter = 0;
   f32 delta = 0.016666666f;
-  while (elapsed < 20) {
+  for (u64 i = 0; i < LOOPS; ++i) {
-    update_positions(manager.tags, manager.rects, manager.velocities, manager.count, delta);
+    update_counter += update_positions(manager.tags, manager.rects, manager.velocities, manager.count, delta);
 
     char line[LINE_BUF_LEN] = {0};
 
-    log_data(manager.rects, manager.count, fp, line);
+    render_counter += log_data(manager.rects, manager.count, fp, line);
-
-    elapsed = time(NULL) - start;
   }
 
+  fclose(fp);
   wapp_mem_arena_allocator_destroy(&arena);
 
+  printf("UPDATE: %lu, RENDER: %lu\n", update_counter, render_counter);
+
   return 0;
 }
 
@@ -167,7 +167,7 @@ void zero_velocity(Velocity *velocity, XOR256State *state) {
   velocity->y = 0.0f;
 }
 
-void update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f32 delta) {
+u64 update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f32 delta) {
   persistent f32 multipliers[2] = {1.0f, 0.5f};
   persistent u64 inside_zone_mask = 0x7;
 
@@ -175,6 +175,7 @@ void update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f3
   f32 pos_x, pos_y;
   f32 max_x, max_y;
 
+  u64 total = 0;
   for (u64 i = ZONE_COUNT; i < count; ++i) {
     tags[i] &= inside_zone_mask;
     for (u64 j = 0; j < ZONE_COUNT; ++j) {
@@ -201,7 +202,11 @@ void update_positions(u8 *tags, Rect *rects, Velocity *velocities, u64 count, f3
 
     rects[i].position.x = roundf(pos_x);
     rects[i].position.y = roundf(pos_y);
+
+    ++total;
   }
+
+  return total;
 }
 
 u8 collides(const Rect *rect, const Rect *collider) {
@@ -223,7 +228,8 @@ i16 get_random_velocity(XOR256State *state) {
   return (wapp_prng_xorshift_256(state) % (MAX_ABS_VELOCITY + 1 - MIN_ABS_VELOCITY)) + MIN_ABS_VELOCITY;
 }
 
-void log_data(const Rect *rects, u64 count, FILE *fp, char *line) {
+u64 log_data(const Rect *rects, u64 count, FILE *fp, char *line) {
+  u64 total = 0;
   for (u64 i = 0; i < count; ++i) {
     snprintf(
       line, LINE_BUF_LEN,
@@ -236,5 +242,9 @@ void log_data(const Rect *rects, u64 count, FILE *fp, char *line) {
     u64 size = strlen(line);
     fwrite(line, sizeof(char), size, fp);
     memset(line, 0, size);
+
+    ++total;
   }
+
+  return total;
 }

no_dod.c

@@ -66,11 +66,12 @@ int main(void) {
   FILE *fp = fopen("no_dod.out", "w");
   assert(fp != NULL);
 
-  time_t start   = time(NULL);
+  u64 update_counter = 0;
-  time_t elapsed = (time_t)-1;
+  u64 render_counter = 0;
-  while (elapsed < 20) {
+  for (u64 i = 0; i < LOOPS; ++i) {
     for (u64 i = 0; i < WANDERER_COUNT; ++i) {
       move_wanderer(&(wanderers[i]), zones);
+      ++update_counter;
     }
 
     char line[LINE_BUF_LEN] = {0};
@@ -87,14 +88,15 @@ int main(void) {
       u64 size = strlen(line);
       fwrite(line, sizeof(char), size, fp);
       memset(line, 0, size);
+      ++render_counter;
     }
-
-    elapsed = time(NULL) - start;
   }
 
   fclose(fp);
   wapp_mem_arena_allocator_destroy(&arena);
 
+  printf("UPDATE: %lu, RENDER: %lu\n", update_counter, render_counter);
+
   return 0;
 }