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diff --git a/pugl/pugl_internal_types.h b/pugl/pugl_internal_types.h
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+/*
+  Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+   @file pugl_internal_types.h Private platform-independent type definitions.
+*/
+
+#ifndef PUGL_INTERNAL_TYPES_H
+#define PUGL_INTERNAL_TYPES_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "pugl/pugl.h"
+
+/** Platform-specific internals. */
+typedef struct PuglInternalsImpl PuglInternals;
+
+typedef struct {
+	int  context_version_major;
+	int  context_version_minor;
+	int  red_bits;
+	int  green_bits;
+	int  blue_bits;
+	int  alpha_bits;
+	int  depth_bits;
+	int  stencil_bits;
+	int  samples;
+	bool use_compat_profile;
+	bool double_buffer;
+	bool resizable;
+} PuglHints;
+
+/** Cross-platform view definition. */
+struct PuglViewImpl {
+	PuglHandle       handle;
+	PuglEventFunc    eventFunc;
+
+	PuglInternals* impl;
+
+	char*            windowClass;
+	PuglNativeWindow parent;
+	PuglContextType  ctx_type;
+	uintptr_t        transient_parent;
+
+	PuglHints hints;
+	int       width;
+	int       height;
+	int       min_width;
+	int       min_height;
+	int       min_aspect_x;
+	int       min_aspect_y;
+	int       max_aspect_x;
+	int       max_aspect_y;
+	bool      ignoreKeyRepeat;
+	bool      redisplay;
+	bool      visible;
+};
+
+/** Opaque surface used by draw context. */
+typedef void PuglSurface;
+
+/** Drawing context interface. */
+typedef struct {
+	/** Get visual information from display and setup view as necessary. */
+	int (*configure)(PuglView*);
+
+	/** Create surface and drawing context. */
+	int (*create)(PuglView*);
+
+	/** Destroy surface and drawing context. */
+	int (*destroy)(PuglView*);
+
+	/** Enter drawing context. */
+	int (*enter)(PuglView*);
+
+	/** Leave drawing context, explicitly flushing if parameter is true. */
+	int (*leave)(PuglView*, bool);
+
+	/** Resize drawing context to the given width and height. */
+	int (*resize)(PuglView*, int, int);
+
+	/** Return the puglGetContext() handle for the application, if any. */
+	void* (*getHandle)(PuglView*);
+} PuglDrawContext;
+
+#endif // PUGL_INTERNAL_TYPES_H