SDL 2.0
SDL_uikitmetalview.m
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1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 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 * @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"
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 self.layer.contentsScale = scale;
53 [self updateDrawableSize];
54 }
55
56 return self;
57}
58
59/* Set the size of the metal drawables when the view is resized. */
60- (void)layoutSubviews
61{
62 [super layoutSubviews];
63 [self updateDrawableSize];
64}
65
66- (void)updateDrawableSize
67{
68 CGSize size = self.bounds.size;
69 size.width *= self.layer.contentsScale;
70 size.height *= self.layer.contentsScale;
71 ((CAMetalLayer *)self.layer).drawableSize = size;
72}
73
74@end
75
76SDL_uikitmetalview*
77UIKit_Mtl_AddMetalView(SDL_Window* window)
78{
79 SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
80 SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
81 CGFloat scale = 1.0;
82
83 if ([view isKindOfClass:[SDL_uikitmetalview class]]) {
84 return (SDL_uikitmetalview *)view;
85 }
86
87 if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
88 /* Set the scale to the natural scale factor of the screen - then
89 * the backing dimensions of the Metal view will match the pixel
90 * dimensions of the screen rather than the dimensions in points
91 * yielding high resolution on retine displays.
92 */
93 if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
94 scale = data.uiwindow.screen.nativeScale;
95 } else {
96 scale = data.uiwindow.screen.scale;
97 }
98 }
99 SDL_uikitmetalview *metalview
100 = [[SDL_uikitmetalview alloc] initWithFrame:view.frame
101 scale:scale];
102 [metalview setSDLWindow:window];
103
104 return metalview;
105}
106
107void
108UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
109{
110 @autoreleasepool {
111 SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
112 SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
113 SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG];
114 if (metalview) {
115 CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
116 assert(layer != NULL);
117 if (w) {
118 *w = layer.drawableSize.width;
119 }
120 if (h) {
121 *h = layer.drawableSize.height;
122 }
123 } else {
125 }
126 }
127}
128
129#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
#define SDL_GetWindowSize
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
#define assert(x)
Definition: SDL_malloc.c:1227
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
GLenum GLenum GLenum GLenum GLenum scale
GLsizeiptr size
GLenum GLuint GLint GLint layer
GLfloat GLfloat GLfloat GLfloat h
GLubyte GLubyte GLubyte GLubyte w
@ SDL_WINDOW_ALLOW_HIGHDPI
Definition: SDL_video.h:113
#define NULL
Definition: begin_code.h:167
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
The type used to identify a window.
Definition: SDL_sysvideo.h:74
int frame
Definition: teststreaming.c:60