Atlas - SDL_cocoametalview.m
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[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 * @author Mark Callow, www.edgewise-consulting.com.
23 *
24 * Thanks to Alex Szpakowski, @slime73 on GitHub, for his gist showing
25 * how to add a CAMetalLayer backed view.
26 */
27
28#import "SDL_cocoametalview.h"
29
30#if SDL_VIDEO_DRIVER_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL)
31
32#include "SDL_assert.h"
33
34@implementation SDL_cocoametalview
35
36/* The synthesized getter should be called by super's viewWithTag. */
37@synthesize tag = _tag;
38
39/* Return a Metal-compatible layer. */
40+ (Class)layerClass
41{
42	return NSClassFromString(@"CAMetalLayer");
43}
44
45/* Indicate the view wants to draw using a backing layer instead of drawRect. */
46- (BOOL)wantsUpdateLayer
47{
48    return YES;
49}
50
51/* When the wantsLayer property is set to YES, this method will be invoked to
52 * return a layer instance.
53 */
54- (CALayer*)makeBackingLayer
55{
56    return [self.class.layerClass layer];
57}
58
59- (instancetype)initWithFrame:(NSRect)frame
60                        scale:(CGFloat)scale
61{
62	if ((self = [super initWithFrame:frame])) {
63        _tag = METALVIEW_TAG;
64        self.wantsLayer = YES;
65
66        /* Allow resize. */
67        self.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
68
69        /* Set the desired scale. */
70        ((CAMetalLayer *) self.layer).drawableSize = NSSizeToCGSize([self bounds].size);
71        self.layer.contentsScale = scale;
72    }
73  
74	return self;
75}
76
77/* Set the size of the metal drawables when the view is resized. */
78- (void)resizeWithOldSuperviewSize:(NSSize)oldSize
79{
80    [super resizeWithOldSuperviewSize:oldSize];
81}
82
83@end
84
85SDL_cocoametalview*
86Cocoa_Mtl_AddMetalView(SDL_Window* window)
87{
88    SDL_WindowData* data = (__bridge SDL_WindowData *)window->driverdata;
89    NSView *view = data->nswindow.contentView;
90    CGFloat scale = 1.0;
91
92    if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
93        /* Set the scale to the natural scale factor of the screen - then
94         * the backing dimensions of the Metal view will match the pixel
95         * dimensions of the screen rather than the dimensions in points
96         * yielding high resolution on retine displays.
97         *
98         * N.B. In order for backingScaleFactor to be > 1,
99         * NSHighResolutionCapable must be set to true in the app's Info.plist.
100         */
101        NSWindow* nswindow = data->nswindow;
102        if ([nswindow.screen respondsToSelector:@selector(backingScaleFactor)])
103            scale = data->nswindow.screen.backingScaleFactor;
104    }
105        
106    SDL_cocoametalview *metalview
107        = [[SDL_cocoametalview alloc] initWithFrame:view.frame scale:scale];
108    [view addSubview:metalview];
109    return metalview;
110}
111
112void
113Cocoa_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
114{
115    SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
116    NSView *view = data->nswindow.contentView;
117    SDL_cocoametalview* metalview = [view viewWithTag:METALVIEW_TAG];
118    if (metalview) {
119        CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
120        assert(layer != NULL);
121        if (w) {
122            *w = layer.drawableSize.width;
123        }
124        if (h) {
125            *h = layer.drawableSize.height;
126        }
127    } else {
128        SDL_GetWindowSize(window, w, h);
129    }
130}
131
132#endif /* SDL_VIDEO_DRIVER_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL) */
133
134/* vi: set ts=4 sw=4 expandtab: */
135
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