1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22/**
23 * \file SDL_metal.h
24 *
25 * Header file for functions to creating Metal layers and views on SDL windows.
26 */
27
28#ifndef SDL_metal_h_
29#define SDL_metal_h_
30
31#include "SDL_video.h"
32
33#include "begin_code.h"
34/* Set up for C function definitions, even when using C++ */
35#ifdef __cplusplus
36extern "C" {
37#endif
38
39/**
40 * \brief A handle to a CAMetalLayer-backed NSView (macOS) or UIView (iOS/tvOS).
41 *
42 * \note This can be cast directly to an NSView or UIView.
43 */
44typedef void *SDL_MetalView;
45
46/**
47 * \name Metal support functions
48 */
49/* @{ */
50
51/**
52 * Create a CAMetalLayer-backed NSView/UIView and attach it to the specified
53 * window.
54 *
55 * On macOS, this does *not* associate a MTLDevice with the CAMetalLayer on
56 * its own. It is up to user code to do that.
57 *
58 * The returned handle can be casted directly to a NSView or UIView. To access
59 * the backing CAMetalLayer, call SDL_Metal_GetLayer().
60 *
61 * \since This function is available since SDL 2.0.12.
62 *
63 * \sa SDL_Metal_DestroyView
64 * \sa SDL_Metal_GetLayer
65 */
66extern DECLSPEC SDL_MetalView SDLCALL SDL_Metal_CreateView(SDL_Window * window);
67
68/**
69 * Destroy an existing SDL_MetalView object.
70 *
71 * This should be called before SDL_DestroyWindow, if SDL_Metal_CreateView was
72 * called after SDL_CreateWindow.
73 *
74 * \since This function is available since SDL 2.0.12.
75 *
76 * \sa SDL_Metal_CreateView
77 */
78extern DECLSPEC void SDLCALL SDL_Metal_DestroyView(SDL_MetalView view);
79
80/**
81 * Get a pointer to the backing CAMetalLayer for the given view.
82 *
83 * \since This function is available since SDL 2.0.14.
84 *
85 * \sa SDL_MetalCreateView
86 */
87extern DECLSPEC void *SDLCALL SDL_Metal_GetLayer(SDL_MetalView view);
88
89/**
90 * Get the size of a window's underlying drawable in pixels (for use with
91 * setting viewport, scissor & etc).
92 *
93 * \param window SDL_Window from which the drawable size should be queried
94 * \param w Pointer to variable for storing the width in pixels, may be NULL
95 *
96 * \since This function is available since SDL 2.0.14.
97 *
98 * \sa SDL_GetWindowSize
99 * \sa SDL_CreateWindow
100 */
101extern DECLSPEC void SDLCALL SDL_Metal_GetDrawableSize(SDL_Window* window, int *w,
102 int *h);
103
104/* @} *//* Metal support functions */
105
106/* Ends C function definitions when using C++ */
107#ifdef __cplusplus
108}
109#endif
110#include "close_code.h"
111
112#endif /* SDL_metal_h_ */
113