Atlas - SDL_uikitmetalview.m
Home / ext / SDL2 / src / video / uikit
Lines: 1 | Size: 4089 bytes
[Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)] 
[FILE BEGIN]
1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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 * @author Mark Callow, www.edgewise-consulting.com.
24 *
25 * Thanks to Alex Szpakowski, @slime73 on GitHub, for his gist showing
26 * how to add a CAMetalLayer backed view.
27 */
28
29#include "../../SDL_internal.h"
30
31#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN)
32
33#import "../SDL_sysvideo.h"
34#import "SDL_uikitwindow.h"
35#import "SDL_uikitmetalview.h"
36
37#include "SDL_assert.h"
38
39@implementation SDL_uikitmetalview
40
41/* Returns a Metal-compatible layer. */
42+ (Class)layerClass
43{
44    return [CAMetalLayer class];
45}
46
47- (instancetype)initWithFrame:(CGRect)frame
48                        scale:(CGFloat)scale
49{
50    if ((self = [super initWithFrame:frame])) {
51        self.tag = METALVIEW_TAG;
52        /* Set the desired scale. */
53        ((CAMetalLayer *) self.layer).drawableSize = self.bounds.size;
54        self.layer.contentsScale = scale;
55    }
56
57    return self;
58}
59
60/* Set the size of the metal drawables when the view is resized. */
61- (void)layoutSubviews
62{
63    CGSize bounds;
64
65    [super layoutSubviews];
66
67    bounds = [self bounds].size;
68    bounds.width *= self.layer.contentsScale;
69    bounds.height *= self.layer.contentsScale;
70    ((CAMetalLayer *) self.layer).drawableSize = bounds;
71}
72
73@end
74
75SDL_uikitmetalview*
76UIKit_Mtl_AddMetalView(SDL_Window* window)
77{
78    SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
79    SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
80    CGFloat scale = 1.0;
81
82    if ([view isKindOfClass:[SDL_uikitmetalview class]]) {
83        return (SDL_uikitmetalview *)view;
84    }
85
86    if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
87        /* Set the scale to the natural scale factor of the screen - then
88         * the backing dimensions of the Metal view will match the pixel
89         * dimensions of the screen rather than the dimensions in points
90         * yielding high resolution on retine displays.
91         */
92#ifdef __IPHONE_8_0
93        if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
94            scale = data.uiwindow.screen.nativeScale;
95        } else
96#endif
97        {
98            scale = data.uiwindow.screen.scale;
99        }
100    }
101    SDL_uikitmetalview *metalview
102         = [[SDL_uikitmetalview alloc] initWithFrame:view.frame
103                                               scale:scale];
104    [metalview setSDLWindow:window];
105
106    return metalview;
107}
108
109void
110UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
111{
112    @autoreleasepool {
113        SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
114        SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
115        SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG];
116        if (metalview) {
117            CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
118            assert(layer != NULL);
119            if (w) {
120                *w = layer.drawableSize.width;
121            }
122            if (h) {
123                *h = layer.drawableSize.height;
124            }
125        } else {
126            SDL_GetWindowSize(window, w, h);
127        }
128    }
129}
130
131#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
132
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
See LICENCE files for more information. Not all files are by 0x4248 always check Licencing.