kc3-lang/SDL/src/video/uikit/SDL_uikitmetalview.m

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• Hash : 4b38d4c9
  Author :
  Date : 2022-01-07T12:37:28
  

  Leave the Metal view active on the window when recreating the Metal renderer Fixes https://github.com/libsdl-org/SDL/issues/5140 Also move the metal tag definition to SDL_syswm.h so it can be used by applications

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• src/video/uikit/SDL_uikitmetalview.m

• /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2022 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_VULKAN || SDL_VIDEO_METAL)
  
  #include "SDL_syswm.h"
  #include "../SDL_sysvideo.h"
  
  #import "SDL_uikitwindow.h"
  #import "SDL_uikitmetalview.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 = SDL_METALVIEW_TAG;
          self.layer.contentsScale = scale;
          [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.layer.contentsScale;
      size.height *= self.layer.contentsScale;
      ((CAMetalLayer *)self.layer).drawableSize = size;
  }
  
  @end
  
  SDL_MetalView
  UIKit_Metal_CreateView(_THIS, SDL_Window * window)
  { @autoreleasepool {
      SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
      CGFloat scale = 1.0;
      SDL_uikitmetalview *metalview;
  
      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.
           */
          if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
              scale = data.uiwindow.screen.nativeScale;
          } else {
              scale = data.uiwindow.screen.scale;
          }
      }
  
      metalview = [[SDL_uikitmetalview alloc] initWithFrame:data.uiwindow.bounds
                                                      scale:scale];
      [metalview setSDLWindow:window];
  
      return (void*)CFBridgingRetain(metalview);
  }}
  
  void
  UIKit_Metal_DestroyView(_THIS, SDL_MetalView view)
  { @autoreleasepool {
      SDL_uikitmetalview *metalview = CFBridgingRelease(view);
  
      if ([metalview isKindOfClass:[SDL_uikitmetalview class]]) {
          [metalview setSDLWindow:NULL];
      }
  }}
  
  void *
  UIKit_Metal_GetLayer(_THIS, SDL_MetalView view)
  { @autoreleasepool {
      SDL_uikitview *uiview = (__bridge SDL_uikitview *)view;
      return (__bridge void *)uiview.layer;
  }}
  
  void
  UIKit_Metal_GetDrawableSize(_THIS, 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:SDL_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_VULKAN || SDL_VIDEO_METAL) */
  

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