| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2017 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_VULKAN && SDL_VIDEO_DRIVER_UIKIT |
| |
| #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 |
| tag:(int)tag |
| { |
| if ((self = [super initWithFrame:frame])) { |
| /* Resize properly when rotated. */ |
| self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; |
| |
| /* Set the appropriate scale (for retina display support) */ |
| self.contentScaleFactor = scale; |
| self.tag = tag; |
| |
| [self updateDrawableSize]; |
| } |
| |
| return self; |
| } |
| |
| /* Set the size of the metal drawables when the view is resized. */ |
| - (void)layoutSubviews |
| { |
| [super layoutSubviews]; |
| [self updateDrawableSize]; |
| } |
| |
| - (void)updateDrawableSize |
| { |
| CGSize size = self.bounds.size; |
| size.width *= self.contentScaleFactor; |
| size.height *= self.contentScaleFactor; |
| |
| ((CAMetalLayer *) self.layer).drawableSize = size; |
| } |
| |
| @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 (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) { |
| /* Set the scale to the natural scale factor of the screen - the |
| * backing dimensions of the Metal view will match the pixel |
| * dimensions of the screen rather than the dimensions in points. |
| */ |
| #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 |
| tag:METALVIEW_TAG]; |
| #if 1 |
| [view addSubview:metalview]; |
| #else |
| /* Sets this view as the controller's view, and adds the view to |
| * the window hierarchy. |
| * |
| * Left here for information. Not used because I suspect that for correct |
| * operation it will be necesary to copy everything from the window's |
| * current SDL_uikitview instance to the SDL_uikitview portion of the |
| * SDL_metalview. The latter would be derived from SDL_uikitview rather |
| * than UIView. */ |
| [metalview setSDLWindow:window]; |
| #endif |
| |
| 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 |