1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2020 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_VULKAN || SDL_VIDEO_METAL) 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 76SDL_MetalView 77UIKit_Metal_CreateView(_THIS, SDL_Window * window) 78{ @autoreleasepool { 79 SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata; 80 CGFloat scale = 1.0; 81 SDL_uikitmetalview *metalview; 82 83 if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) { 84 /* Set the scale to the natural scale factor of the screen - then 85 * the backing dimensions of the Metal view will match the pixel 86 * dimensions of the screen rather than the dimensions in points 87 * yielding high resolution on retine displays. 88 */ 89 if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) { 90 scale = data.uiwindow.screen.nativeScale; 91 } else { 92 scale = data.uiwindow.screen.scale; 93 } 94 } 95 96 metalview = [[SDL_uikitmetalview alloc] initWithFrame:data.uiwindow.bounds 97 scale:scale]; 98 [metalview setSDLWindow:window]; 99 100 return (void*)CFBridgingRetain(metalview); 101}} 102 103void 104UIKit_Metal_DestroyView(_THIS, SDL_MetalView view) 105{ @autoreleasepool { 106 SDL_uikitmetalview *metalview = CFBridgingRelease(view); 107 108 if ([metalview isKindOfClass:[SDL_uikitmetalview class]]) { 109 [metalview setSDLWindow:NULL]; 110 } 111}} 112 113void * 114UIKit_Metal_GetLayer(_THIS, SDL_MetalView view) 115{ @autoreleasepool { 116 SDL_uikitview *uiview = (__bridge SDL_uikitview *)view; 117 return (__bridge void *)uiview.layer; 118}} 119 120void 121UIKit_Metal_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h) 122{ 123 @autoreleasepool { 124 SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata; 125 SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view; 126 SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG]; 127 if (metalview) { 128 CAMetalLayer *layer = (CAMetalLayer*)metalview.layer; 129 assert(layer != NULL); 130 if (w) { 131 *w = layer.drawableSize.width; 132 } 133 if (h) { 134 *h = layer.drawableSize.height; 135 } 136 } else { 137 SDL_GetWindowSize(window, w, h); 138 } 139 } 140} 141 142#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_VULKAN || SDL_VIDEO_METAL) */ 143