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Diffstat (limited to 'Source/3rdParty/SDL2/src/video/uikit/SDL_uikitmetalview.m')
| -rw-r--r-- | Source/3rdParty/SDL2/src/video/uikit/SDL_uikitmetalview.m | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/Source/3rdParty/SDL2/src/video/uikit/SDL_uikitmetalview.m b/Source/3rdParty/SDL2/src/video/uikit/SDL_uikitmetalview.m new file mode 100644 index 0000000..104189d --- /dev/null +++ b/Source/3rdParty/SDL2/src/video/uikit/SDL_uikitmetalview.m @@ -0,0 +1,124 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. + */ + +/* + * @author Mark Callow, www.edgewise-consulting.com. + * + * Thanks to Alex Szpakowski, @slime73 on GitHub, for his gist showing + * how to add a CAMetalLayer backed view. + */ + +#include "../../SDL_internal.h" + +#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) + +#import "../SDL_sysvideo.h" +#import "SDL_uikitwindow.h" +#import "SDL_uikitmetalview.h" + +#include "SDL_assert.h" + +@implementation SDL_uikitmetalview + +/* Returns a Metal-compatible layer. */ ++ (Class)layerClass +{ + return [CAMetalLayer class]; +} + +- (instancetype)initWithFrame:(CGRect)frame + scale:(CGFloat)scale +{ + if ((self = [super initWithFrame:frame])) { + self.tag = METALVIEW_TAG; + /* Set the desired scale. The default drawableSize of a CAMetalLayer + * is its bounds x its scale so nothing further needs to be done. */ + self.layer.contentsScale = scale; + } + + return self; +} + +/* Set the size of the metal drawables when the view is resized. */ +- (void)layoutSubviews +{ + [super layoutSubviews]; +} + +@end + +SDL_uikitmetalview* +UIKit_Mtl_AddMetalView(SDL_Window* window) +{ + SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata; + SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view; + CGFloat scale = 1.0; + + if ([view isKindOfClass:[SDL_uikitmetalview class]]) { + return (SDL_uikitmetalview *)view; + } + + if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) { + /* Set the scale to the natural scale factor of the screen - then + * the backing dimensions of the Metal view will match the pixel + * dimensions of the screen rather than the dimensions in points + * yielding high resolution on retine displays. + */ +#ifdef __IPHONE_8_0 + if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) { + scale = data.uiwindow.screen.nativeScale; + } else +#endif + { + scale = data.uiwindow.screen.scale; + } + } + SDL_uikitmetalview *metalview + = [[SDL_uikitmetalview alloc] initWithFrame:view.frame + scale:scale]; + [metalview setSDLWindow:window]; + + return metalview; +} + +void +UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h) +{ + @autoreleasepool { + SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata; + SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view; + SDL_uikitmetalview* metalview = [view viewWithTag:METALVIEW_TAG]; + if (metalview) { + CAMetalLayer *layer = (CAMetalLayer*)metalview.layer; + assert(layer != NULL); + if (w) { + *w = layer.drawableSize.width; + } + if (h) { + *h = layer.drawableSize.height; + } + } else { + SDL_GetWindowSize(window, w, h); + } + } +} + +#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */ |