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  /* Set the desired scale. The default drawableSize of a CAMetalLayer
53  * is its bounds x its scale so nothing further needs to be done. */
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  [super layoutSubviews];
64 }
65 
66 @end
67 
68 SDL_uikitmetalview*
69 UIKit_Mtl_AddMetalView(SDL_Window* window)
70 {
71  SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
72  SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
73  CGFloat scale = 1.0;
74 
75  if ([view isKindOfClass:[SDL_uikitmetalview class]]) {
76  return (SDL_uikitmetalview *)view;
77  }
78 
79  if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
80  /* Set the scale to the natural scale factor of the screen - then
81  * the backing dimensions of the Metal view will match the pixel
82  * dimensions of the screen rather than the dimensions in points
83  * yielding high resolution on retine displays.
84  */
85 #ifdef __IPHONE_8_0
86  if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
87  scale = data.uiwindow.screen.nativeScale;
88  } else
89 #endif
90  {
91  scale = data.uiwindow.screen.scale;
92  }
93  }
94  SDL_uikitmetalview *metalview
95  = [[SDL_uikitmetalview alloc] initWithFrame:view.frame
96  scale:scale];
97  [metalview setSDLWindow:window];
98 
99  return metalview;
100 }
101 
102 void
103 UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
104 {
105  @autoreleasepool {
106  SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
107  SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
108  SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG];
109  if (metalview) {
110  CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
111  assert(layer != NULL);
112  if (w) {
113  *w = layer.drawableSize.width;
114  }
115  if (h) {
116  *h = layer.drawableSize.height;
117  }
118  } else {
119  SDL_GetWindowSize(window, w, h);
120  }
121  }
122 }
123 
124 #endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
GLenum GLenum GLenum GLenum GLenum scale
GLfloat GLfloat GLfloat GLfloat h
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
GLenum GLuint GLint GLint layer
#define assert(x)
Definition: SDL_malloc.c:1219
#define SDL_GetWindowSize
int frame
Definition: teststreaming.c:60
GLubyte GLubyte GLubyte GLubyte w
UIWindow * uiwindow
#define NULL
Definition: begin_code.h:164
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
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
The type used to identify a window.
Definition: SDL_sysvideo.h:73
void * driverdata
Definition: SDL_sysvideo.h:111
Uint32 flags
Definition: SDL_sysvideo.h:83