mirror of https://github.com/encounter/SDL.git
144 lines
4.2 KiB
Objective-C
144 lines
4.2 KiB
Objective-C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/*
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* @author Mark Callow, www.edgewise-consulting.com.
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*
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* Thanks to Alex Szpakowski, @slime73 on GitHub, for his gist showing
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* how to add a CAMetalLayer backed view.
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*/
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#include "../../SDL_internal.h"
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#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_VULKAN || SDL_VIDEO_METAL)
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#include "SDL_syswm.h"
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#include "../SDL_sysvideo.h"
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#import "SDL_uikitwindow.h"
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#import "SDL_uikitmetalview.h"
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@implementation SDL_uikitmetalview
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/* Returns a Metal-compatible layer. */
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+ (Class)layerClass
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{
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return [CAMetalLayer class];
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}
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- (instancetype)initWithFrame:(CGRect)frame
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scale:(CGFloat)scale
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{
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if ((self = [super initWithFrame:frame])) {
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self.tag = SDL_METALVIEW_TAG;
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self.layer.contentsScale = scale;
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[self updateDrawableSize];
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}
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return self;
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}
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/* Set the size of the metal drawables when the view is resized. */
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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[self updateDrawableSize];
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}
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- (void)updateDrawableSize
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{
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CGSize size = self.bounds.size;
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size.width *= self.layer.contentsScale;
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size.height *= self.layer.contentsScale;
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((CAMetalLayer *)self.layer).drawableSize = size;
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}
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@end
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SDL_MetalView
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UIKit_Metal_CreateView(_THIS, SDL_Window * window)
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{ @autoreleasepool {
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SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
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CGFloat scale = 1.0;
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SDL_uikitmetalview *metalview;
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if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
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/* Set the scale to the natural scale factor of the screen - then
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* the backing dimensions of the Metal view will match the pixel
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* dimensions of the screen rather than the dimensions in points
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* yielding high resolution on retine displays.
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*/
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if ([data.uiwindow.screen respondsToSelector:@selector(nativeScale)]) {
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scale = data.uiwindow.screen.nativeScale;
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} else {
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scale = data.uiwindow.screen.scale;
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}
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}
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metalview = [[SDL_uikitmetalview alloc] initWithFrame:data.uiwindow.bounds
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scale:scale];
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[metalview setSDLWindow:window];
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return (void*)CFBridgingRetain(metalview);
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}}
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void
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UIKit_Metal_DestroyView(_THIS, SDL_MetalView view)
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{ @autoreleasepool {
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SDL_uikitmetalview *metalview = CFBridgingRelease(view);
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if ([metalview isKindOfClass:[SDL_uikitmetalview class]]) {
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[metalview setSDLWindow:NULL];
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}
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}}
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void *
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UIKit_Metal_GetLayer(_THIS, SDL_MetalView view)
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{ @autoreleasepool {
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SDL_uikitview *uiview = (__bridge SDL_uikitview *)view;
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return (__bridge void *)uiview.layer;
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}}
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void
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UIKit_Metal_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
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{
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@autoreleasepool {
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SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
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SDL_uikitview *view = (SDL_uikitview*)data.uiwindow.rootViewController.view;
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SDL_uikitmetalview* metalview = [view viewWithTag:SDL_METALVIEW_TAG];
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if (metalview) {
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CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
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assert(layer != NULL);
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if (w) {
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*w = layer.drawableSize.width;
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}
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if (h) {
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*h = layer.drawableSize.height;
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}
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} else {
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SDL_GetWindowSize(window, w, h);
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}
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}
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}
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#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_VULKAN || SDL_VIDEO_METAL) */
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