started window management

Juliet/render/d3d12/render_d3d12.h

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+#pragma once

Juliet/render/render.h

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+#pragma once

Juliet/render/render_inc.c

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+#include "render.c"
+
+#if R_BACKEND == R_BACKEND_D3D12
+# include "d3d12/render_d3d12.c"
+#endif

Juliet/render/render_inc.h

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+#pragma once
+
+#define R_BACKEND_D3D12 0
+
+#if !defined(R_BACKEND)
+# define R_BACKEND R_BACKEND_D3D12
+#endif
+
+#include "render.h"
+
+#if R_BACKEND == R_BACKEND_D3D12
+# include "d3d12/render_d3d12.h"
+#else
+# error Renderer backend non specified
+#endif