From c0969c7833b326d6edb86b8076e7772d2440a886 Mon Sep 17 00:00:00 2001
From: MysterD <myster@d>
Date: Tue, 26 Apr 2022 18:35:59 -0700
Subject: [PATCH] Added general purpose profile functions

---
 src/pc/utils/profile.c | 103 +++++++++++++++++++++++++++++++++++++++++
 src/pc/utils/profile.h |  12 +++++
 2 files changed, 115 insertions(+)
 create mode 100644 src/pc/utils/profile.c
 create mode 100644 src/pc/utils/profile.h

diff --git a/src/pc/utils/profile.c b/src/pc/utils/profile.c
new file mode 100644
index 00000000..6aeaa6df
--- /dev/null
+++ b/src/pc/utils/profile.c
@@ -0,0 +1,103 @@
+#include "types.h"
+#include "PR/gbi.h"
+#include "pc/utils/stb_ds.h"
+#include "pc/debuglog.h"
+#include <SDL2/SDL.h>
+
+struct ProfileCounters {
+    const char* key;
+    f64 start;
+    f64 end;
+    f64 sum;
+    f64 disp;
+    f64 avg;
+    f64 max;
+    u8 newMax;
+    u32 indent;
+};
+
+static u32 sProfileIndent = 0;
+
+static struct { char *key; struct ProfileCounters* value; } *sCounters = NULL;
+
+void profiler_reset_counters(void) {
+    s32 counters = hmlen(sCounters);
+    for (s32 i = 0; i < counters; ++i) {
+        struct ProfileCounters* v = sCounters[i].value;
+        if (v == NULL) { continue; }
+        v->disp = 0;
+        v->max = 0;
+        v->avg = 0;
+        v->sum = 0;
+    }
+}
+
+void profiler_start_counter(const char* keyName) {
+    u32 counters = -1;
+    struct ProfileCounters* v = hmget(sCounters, (char*)keyName);
+    if (v == NULL) {
+        v = calloc(1, sizeof(struct ProfileCounters));
+        if (v == NULL) { return; }
+        //hm_new_strdup(sCounters);
+        hmput(sCounters, (char*)keyName, v);
+        counters = hmlenu(sCounters);
+    }
+
+    counters = counters;
+    f64 freq = SDL_GetPerformanceFrequency();
+    f64 curr = SDL_GetPerformanceCounter();
+    v->key = keyName;
+    v->start = curr / freq;
+    v->indent = sProfileIndent++;
+}
+
+void profiler_stop_counter(const char* keyName) {
+    struct ProfileCounters* v = hmget(sCounters, (char*)keyName);
+    if (v == NULL) {
+        return;
+    }
+
+    f64 freq = SDL_GetPerformanceFrequency();
+    f64 curr = SDL_GetPerformanceCounter();
+    v->end = curr / freq;
+    v->sum += v->end - v->start;
+    sProfileIndent--;
+}
+
+void profiler_update_counters() {
+    s32 counters = hmlen(sCounters);
+    bool slow = false;
+    for (s32 i = 0; i < counters; ++i) {
+        struct ProfileCounters* v = sCounters[i].value;
+        if (v == NULL) { continue; }
+        v->disp = v->sum;// / (f64) REFRESH_RATE;
+        v->newMax = (v->max < v->sum);
+        v->max = MAX(v->sum, v->max);
+        v->avg = v->avg * 0.9 + v->sum * 0.1;
+
+        slow = slow || v->sum > 0.034;
+        v->sum = 0;
+    }
+
+
+    if (slow) {
+        printf("-----------------------------------\n");
+        char indent[64] = { 0 };
+        for (s32 i = 0; i < counters; ++i) {
+            struct ProfileCounters* v = sCounters[i].value;
+            if (v == NULL) { continue; }
+
+            v->indent = MIN(v->indent, 63);
+            char* ind = indent;
+            while (v->indent > 0) {
+                *ind = ' ';
+                ind++;
+                v->indent--;
+            }
+            *ind = '\0';
+
+            printf("PROF: %f : %f : %f : %s%s%s\n", v->disp, v->avg, v->max, indent, v->key, v->newMax ? " <<<" : "");
+        }
+    }
+    sProfileIndent = 0;
+}
\ No newline at end of file
diff --git a/src/pc/utils/profile.h b/src/pc/utils/profile.h
new file mode 100644
index 00000000..7c5805ef
--- /dev/null
+++ b/src/pc/utils/profile.h
@@ -0,0 +1,12 @@
+#ifndef PROFILE_H
+#define PROFILE_H
+
+#define PROFILE_BEGIN() profiler_start_counter(__FUNCTION__)
+#define PROFILE_END() profiler_stop_counter(__FUNCTION__)
+
+void profiler_reset_counters(void);
+void profiler_start_counter(const char* key);
+void profiler_stop_counter(const char* key);
+void profiler_update_counters();
+
+#endif