Working on rendering

src/basic/filesystem.h

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+#pragma once
+#include "../basic/basic.h"
+
+struct FileIter {
+    bool   is_valid;
+    bool   is_directory;
+    String absolute_path;
+    String relative_path;
+    String filename;
+
+    String    path;
+    Allocator allocator;
+    Arena    *arena;
+    TempArena temp;
+    union {
+        struct Win32_FileIter *w32;
+        void                  *dir;
+    };
+};
+
+String   ReadFile(Allocator arena, String path);
+String   GetAbsolutePath(Allocator arena, String relative);
+bool     IsValid(const FileIter &it);
+void     Advance(FileIter *it);
+FileIter IterateFiles(Allocator allocator, String path);
+bool     InitOS();
+
+struct Process {
+    bool is_valid;
+    char platform[32];
+};
+
+Process RunEx(String cmd);
+int     Wait(Process *process);