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+/*
+  Copyright 2012-2020 David Robillard <d@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 types.h
+   @brief Shared internal type definitions.
+*/
+
+#ifndef PUGL_DETAIL_TYPES_H
+#define PUGL_DETAIL_TYPES_H
+
+#include "pugl/pugl.h"
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+// Unused parameter macro to suppresses warnings and make it impossible to use
+#if defined(__cplusplus)
+#   define PUGL_UNUSED(name)
+#elif defined(__GNUC__) || defined(__clang__)
+#   define PUGL_UNUSED(name) name##_unused __attribute__((__unused__))
+#else
+#   define PUGL_UNUSED(name) name
+#endif
+
+/// Platform-specific world internals
+typedef struct PuglWorldInternalsImpl PuglWorldInternals;
+
+/// Platform-specific view internals
+typedef struct PuglInternalsImpl PuglInternals;
+
+/// View hints
+typedef int PuglHints[PUGL_NUM_VIEW_HINTS];
+
+/// Blob of arbitrary data
+typedef struct {
+	void*  data; ///< Dynamically allocated data
+	size_t len;  ///< Length of data in bytes
+} PuglBlob;
+
+/// Cross-platform view definition
+struct PuglViewImpl {
+	PuglWorld*         world;
+	const PuglBackend* backend;
+	PuglInternals*     impl;
+	PuglHandle         handle;
+	PuglEventFunc      eventFunc;
+	char*              title;
+	PuglBlob           clipboard;
+	PuglNativeView     parent;
+	uintptr_t          transientParent;
+	PuglRect           frame;
+	PuglEventConfigure lastConfigure;
+	PuglHints          hints;
+	int                defaultWidth;
+	int                defaultHeight;
+	int                minWidth;
+	int                minHeight;
+	int                maxWidth;
+	int                maxHeight;
+	int                minAspectX;
+	int                minAspectY;
+	int                maxAspectX;
+	int                maxAspectY;
+	bool               visible;
+};
+
+/// Cross-platform world definition
+struct PuglWorldImpl {
+	PuglWorldInternals* impl;
+	PuglWorldHandle     handle;
+	PuglLogFunc         logFunc;
+	char*               className;
+	double              startTime;
+	size_t              numViews;
+	PuglView**          views;
+	PuglLogLevel        logLevel;
+};
+
+/// Opaque surface used by graphics backend
+typedef void PuglSurface;
+
+/// Graphics backend interface
+struct PuglBackendImpl {
+	/// Get visual information from display and setup view as necessary
+	PuglStatus (*configure)(PuglView*);
+
+	/// Create surface and drawing context
+	PuglStatus (*create)(PuglView*);
+
+	/// Destroy surface and drawing context
+	PuglStatus (*destroy)(PuglView*);
+
+	/// Enter drawing context, for drawing if expose is non-null
+	PuglStatus (*enter)(PuglView*, const PuglEventExpose*);
+
+	/// Leave drawing context, after drawing if expose is non-null
+	PuglStatus (*leave)(PuglView*, const PuglEventExpose*);
+
+	/// Return the puglGetContext() handle for the application, if any
+	void* (*getContext)(PuglView*);
+};
+
+#endif // PUGL_DETAIL_TYPES_H