From 7dc2952b8d567ab7b37f40089a84fe13538d06f7 Mon Sep 17 00:00:00 2001
From: Luke Benstead <kazade@gmail.com>
Date: Tue, 3 Jul 2018 20:08:52 +0100
Subject: [PATCH] Start stubbing out profiling utils

---
 GL/draw.c    |  3 +++
 GL/profile.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
 GL/profile.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 145 insertions(+)
 create mode 100644 GL/profile.c
 create mode 100644 GL/profile.h

diff --git a/GL/draw.c b/GL/draw.c
index e1e861b..7e1cc95 100644
--- a/GL/draw.c
+++ b/GL/draw.c
@@ -3,6 +3,7 @@
 #include "../include/gl.h"
 #include "../include/glext.h"
 #include "private.h"
+#include "profile.h"
 
 typedef struct {
     const void* ptr;
@@ -192,6 +193,8 @@ inline void transformNormalToEyeSpace(GLfloat* normal) {
 
 
 static void submitVertices(GLenum mode, GLsizei first, GLsizei count, GLenum type, const GLvoid* indices) {
+    TRACE_START();
+
     static GLfloat normal[3] = {0.0f, 0.0f, -1.0f};
     static GLfloat eye_P[3];
     static GLfloat eye_N[3];
diff --git a/GL/profile.c b/GL/profile.c
new file mode 100644
index 0000000..8fd22a0
--- /dev/null
+++ b/GL/profile.c
@@ -0,0 +1,68 @@
+#include "profile.h"
+
+Profiler __profiler;
+
+void profiler_init() {
+    __profiler.trace_count = 0;
+}
+
+static uint32_t time_now_in_ms() {
+    return timer_us_gettime64() / 1000;
+}
+
+static int compare(const void* trace1, const void* trace2) {
+    Trace* t1 = (Trace*) trace1;
+    Trace* t2 = (Trace*) trace2;
+    return (t1->total_time < t2->total_time) ? -1 : (t2->total_time < t1->total_time) ? 1 : 0;
+}
+
+void profiler_dump(uint32_t ms) {
+    static uint32_t time_since_last = time_now_in_ms();
+
+    uint32_t now = time_now_in_ms();
+
+    if((now - time_since_last) >= ms) {
+        qsort(__profiler.traces, __profiler.trace_count, sizeof(Trace), compare);
+
+        fprintf(stderr, "Function\t\t\t\tTotal Time\t\t\t\tBreakdown\n");
+        for(uint8_t i = 0; i < __profiler.trace_count; ++i) {
+            Trace* trace = __profiler.traces + i;
+            fprintf(stderr, "%s\t\t\t\t%dms\n", trace->name, trace->total_time);
+
+            for(uint8_t j = 0; j < trace->max_checkpoints; ++j) {
+                fprintf(stderr, "\t\t\t\t\t\t\t\t%d: %dms\n", trace->checkpoints[j].total_time);
+            }
+
+            fprintf(stderr, "\n\n");
+        }
+
+        time_since_last -= ms;
+    }
+}
+
+void profiler_register_trace(Trace* trace, const char* func_name) {
+    __profiler.traces[__profiler.trace_count++] = trace;
+
+    trace->calls = 0;
+    trace->max_checkpoints = 0;
+    trace->total_time = 0;
+    trace->start = 0;
+
+    strncpy(trace->name, func_name, 128);
+}
+
+void profiler_trace_start(Trace* trace) {
+    trace->start = time_now_in_ms();
+    trace->calls++;
+}
+
+void profiler_trace_checkpoint(Trace* trace, int counter) {
+    uint32_t now = time_now_in_ms();
+    uint32_t checkpoint_time = (now - trace->start);
+
+    trace->total_time += checkpoint_time;
+    trace->start = now;
+
+    trace->checkpoints[counter].total_time + checkpoint_time;
+    trace->checkpoints[counter].calls++;
+}
diff --git a/GL/profile.h b/GL/profile.h
new file mode 100644
index 0000000..e9695ef
--- /dev/null
+++ b/GL/profile.h
@@ -0,0 +1,74 @@
+#ifndef PROFILE_H
+#define PROFILE_H
+
+#include <stdint.h>
+#include "../containers/aligned_vector.h"
+
+/* USAGE:
+ *
+ * profiler_init();
+ *
+ * void my_func() {
+ *   TRACE_START();
+ *
+ *   ...
+ *
+ *   TRACE_CHECKPOINT();
+ *
+ *   ...
+ *
+ *   TRACE_CHECKPOINT();
+ * }
+ *
+ * profiler_dump(1000);
+ *
+ *
+ * Output:
+ *
+ * Name                Total Time          Breakdown
+ * -------------------------------------------------
+   my_func             15.33
+                                           0: 4.23
+                                           1: 11.10
+
+ */
+
+typedef struct {
+    uint32_t total_time;
+    uint32_t calls;
+} Checkpoint;
+
+typedef struct {
+    char name[128];
+    uint32_t calls;
+    uint32_t start;
+    uint32_t total_time;
+    Checkpoint checkpoints[16];
+    uint8_t max_checkpoints;
+} Trace;
+
+struct Profiler {
+    Trace traces[256];
+    uint8_t trace_count;
+};
+
+extern Profiler __profiler;
+
+void profiler_init();
+void profiler_dump(uint32_t ms);
+void profiler_register_trace(Trace* trace, const char* func_name);
+void profiler_trace_start(Trace* trace);
+void profiler_trace_checkpoint(Trace* trace, int counter);
+
+#define TRACE_START() \
+    int __sc = 0; \
+    static char __trace_registered = 0;
+    static Trace __trace; \
+    if(!_trace_registered) {profiler_register_trace(&__trace, __func__); __trace_registered = 1;} \
+    profiler_trace_start(&__trace);
+
+#define TRACE_CHECKPOINT() \
+    profiler_trace_checkpoint(&__trace, __sc++);
+
+
+#endif // PROFILE_H