benchmark: add

include/benchmark.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <SDL2/SDL_stdinc.h>
+
+typedef struct {
+    Uint64 start;
+} BENCHMARK;
+
+BENCHMARK *Benchmark_Start(void);
+
+#define Benchmark_End(...)                                                     \
+    Benchmark_End_Impl(__FILE__, __LINE__, __func__, __VA_ARGS__)
+
+void Benchmark_End_Impl(
+    const char *file, int32_t line, const char *func, BENCHMARK *b,
+    const char *message);

src/benchmark.c

@@ -0,0 +1,29 @@
+#include "benchmark.h"
+
+#include "log.h"
+#include "memory.h"
+
+#include <SDL2/SDL_timer.h>
+
+BENCHMARK *Benchmark_Start(void)
+{
+    BENCHMARK *const b = Memory_Alloc(sizeof(BENCHMARK));
+    b->start = SDL_GetPerformanceCounter();
+    return b;
+}
+
+void Benchmark_End_Impl(
+    const char *const file, const int32_t line, const char *const func,
+    BENCHMARK *b, const char *const message)
+{
+    const double elapsed = (double)(SDL_GetPerformanceCounter() - b->start)
+        * 1000.0 / (double)SDL_GetPerformanceFrequency();
+
+    if (message == NULL) {
+        Log_Message(file, line, func, "took %.02f ms", elapsed);
+    } else {
+        Log_Message(file, line, func, "%s: took %.02f ms", message, elapsed);
+    }
+
+    Memory_FreePointer(&b);
+}