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

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• Hash : ac2d1f67
  Author :
  Date : 2018-03-02T12:08:18
  

  Fixed setting the layer drawable size Without this change the drawable had a size of 0 and the metal renderer asserted because the projection matrix wasn't set.

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• src/video/uikit/SDL_uikitmetalview.m

• /*
   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
  {
      CGSize bounds;
  
      [super layoutSubviews];
  
      bounds = [self bounds].size;
      bounds.width *= self.layer.contentsScale;
      bounds.height *= self.layer.contentsScale;
      ((CAMetalLayer *) self.layer).drawableSize = bounds;
  }
  
  @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) */
  

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