SDL  2.0
SDL_uikitmetalview.m
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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"
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  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 
76 SDL_uikitmetalview*
77 UIKit_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 #ifdef __IPHONE_8_0
94  if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
95  scale = data.uiwindow.screen.nativeScale;
96  } else
97 #endif
98  {
99  scale = data.uiwindow.screen.scale;
100  }
101  }
102  SDL_uikitmetalview *metalview
103  = [[SDL_uikitmetalview alloc] initWithFrame:view.frame
104  scale:scale];
105  [metalview setSDLWindow:window];
106 
107  return metalview;
108 }
109 
110 void
111 UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
112 {
113  @autoreleasepool {
114  SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
115  SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
116  SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG];
117  if (metalview) {
118  CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
119  assert(layer != NULL);
120  if (w) {
121  *w = layer.drawableSize.width;
122  }
123  if (h) {
124  *h = layer.drawableSize.height;
125  }
126  } else {
128  }
129  }
130 }
131 
132 #endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
SDL_WINDOW_ALLOW_HIGHDPI
@ SDL_WINDOW_ALLOW_HIGHDPI
Definition: SDL_video.h:113
scale
GLenum GLenum GLenum GLenum GLenum scale
Definition: SDL_opengl_glext.h:9375
NULL
#define NULL
Definition: begin_code.h:164
layer
GLenum GLuint GLint GLint layer
Definition: SDL_opengl_glext.h:1186
SDL_WindowData
Definition: SDL_androidwindow.h:36
assert
#define assert(x)
Definition: SDL_malloc.c:1219
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:74
SDL_GetWindowSize
#define SDL_GetWindowSize
Definition: SDL_dynapi_overrides.h:527
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
frame
int frame
Definition: teststreaming.c:60
SDL_assert.h
size
GLsizeiptr size
Definition: SDL_opengl_glext.h:537
SDL_uikitwindow.h
SDL_uikitview
Definition: SDL_uikitview.h:29
void
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
Definition: SDL_dynapi_procs.h:89
SDL_uikitmetalview.h
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731