Added conditional compilation and Const namespace with OS name

examples/raymarcher.core

@@ -100,37 +100,6 @@ Raymarcher_Update :: ()
 #import "USER32.core"
 #import "WINMM.core"
 
-Windows_Bitmap :: struct
-  size: Vec2I
-  data: *U32
-  hdc: HDC
-  dib: HBITMAP
-
-CreateBitmap :: (size: Vec2I, bottom_up: Bool = true): Windows_Bitmap
-  result: Windows_Bitmap = {size = size}
-  if bottom_up == false
-    result.size.y = -result.size.y
-
-  header_size: U32 = SizeOf(BITMAPINFOHEADER)
-  Assert(header_size == 40)
-  bminfo := BITMAPINFO{
-    BITMAPINFOHEADER{
-      biSize          = header_size,
-      biWidth         = size.x->LONG,
-      biHeight        = size.y->LONG,
-      biPlanes        = 1,
-      biBitCount      = 32,
-      biCompression   = BI_RGB,
-      biXPelsPerMeter = 1,
-      biYPelsPerMeter = 1,
-    }
-  }
-
-  hdc := GetDC(0)
-  result.dib = CreateDIBSection(hdc, &bminfo, DIB_RGB_COLORS, (&result.data)->**void, 0, 0)
-  result.hdc = CreateCompatibleDC(hdc)
-  return result
-
 
 AppIsRunning := true
 WindowProc :: (hwnd: HWND, msg: UINT, wparam: WPARAM, lparam: LPARAM): LRESULT
@@ -206,4 +175,36 @@ WinMain :: (hInstance: HINSTANCE, hPrevInstance: HINSTANCE, lpCmdLine: LPSTR, nS
 
     if CStringCompare(lpCmdLine, "testing")
       return 0
-  return 0
+  return 0
+
+
+Windows_Bitmap :: struct
+  size: Vec2I
+  data: *U32
+  hdc: HDC
+  dib: HBITMAP
+
+CreateBitmap :: (size: Vec2I, bottom_up: Bool = true): Windows_Bitmap
+  result: Windows_Bitmap = {size = size}
+  if bottom_up == false
+    result.size.y = -result.size.y
+
+  header_size: U32 = SizeOf(BITMAPINFOHEADER)
+  Assert(header_size == 40)
+  bminfo := BITMAPINFO{
+    BITMAPINFOHEADER{
+      biSize          = header_size,
+      biWidth         = size.x->LONG,
+      biHeight        = size.y->LONG,
+      biPlanes        = 1,
+      biBitCount      = 32,
+      biCompression   = BI_RGB,
+      biXPelsPerMeter = 1,
+      biYPelsPerMeter = 1,
+    }
+  }
+
+  hdc := GetDC(0)
+  result.dib = CreateDIBSection(hdc, &bminfo, DIB_RGB_COLORS, (&result.data)->**void, 0, 0)
+  result.hdc = CreateCompatibleDC(hdc)
+  return result