SDL_cocoametalview.m
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2019 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.
*/
#import "SDL_cocoametalview.h"
#if SDL_VIDEO_DRIVER_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL)
#include "SDL_assert.h"
@implementation SDL_cocoametalview
/* Return a Metal-compatible layer. */
+ (Class)layerClass
{
return NSClassFromString(@"CAMetalLayer");
}
/* Indicate the view wants to draw using a backing layer instead of drawRect. */
- (BOOL)wantsUpdateLayer
{
return YES;
}
/* When the wantsLayer property is set to YES, this method will be invoked to
* return a layer instance.
*/
- (CALayer*)makeBackingLayer
{
return [self.class.layerClass layer];
}
- (instancetype)initWithFrame:(NSRect)frame
highDPI:(BOOL)highDPI
{
if ((self = [super initWithFrame:frame])) {
self.highDPI = highDPI;
self.wantsLayer = YES;
/* Allow resize. */
self.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
[self updateDrawableSize];
}
return self;
}
- (NSInteger)tag
{
return METALVIEW_TAG;
}
- (void)updateDrawableSize
{
CAMetalLayer *metalLayer = (CAMetalLayer *)self.layer;
CGSize size = self.bounds.size;
CGSize backingSize = size;
if (self.highDPI) {
/* Note: NSHighResolutionCapable must be set to true in the app's
* Info.plist in order for the backing size to be high res.
*/
backingSize = [self convertSizeToBacking:size];
}
metalLayer.contentsScale = backingSize.height / size.height;
metalLayer.drawableSize = backingSize;
}
/* Set the size of the metal drawables when the view is resized. */
- (void)resizeWithOldSuperviewSize:(NSSize)oldSize
{
[super resizeWithOldSuperviewSize:oldSize];
[self updateDrawableSize];
}
@end
SDL_cocoametalview*
Cocoa_Mtl_AddMetalView(SDL_Window* window)
{
SDL_WindowData* data = (__bridge SDL_WindowData *)window->driverdata;
NSView *view = data->nswindow.contentView;
BOOL highDPI = (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) != 0;
SDL_cocoametalview *metalview;
metalview = [[SDL_cocoametalview alloc] initWithFrame:view.frame highDPI:highDPI];
[view addSubview:metalview];
return metalview;
}
void
Cocoa_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
{
SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
NSView *view = data->nswindow.contentView;
SDL_cocoametalview* metalview = [view viewWithTag:METALVIEW_TAG];
if (metalview) {
CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
SDL_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_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL) */
/* vi: set ts=4 sw=4 expandtab: */
SDL_WINDOW_ALLOW_HIGHDPI
@ SDL_WINDOW_ALLOW_HIGHDPI
Definition: SDL_video.h:113
NULL
#define NULL
Definition: begin_code.h:167
layer
GLenum GLuint GLint GLint layer
Definition: SDL_opengl_glext.h:1186
SDL_WindowData
Definition: SDL_androidwindow.h:38
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
SDL_GetWindowSize
#define SDL_GetWindowSize
Definition: SDL_dynapi_overrides.h:527
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
frame
int frame
Definition: teststreaming.c:60
SDL_assert.h
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
size
GLsizeiptr size
Definition: SDL_opengl_glext.h:537
SDL_cocoametalview.h
void
const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char const char const SDL_SCANF_FORMAT_STRING char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
Definition: SDL_dynapi_procs.h:89
SDL_WindowData::nswindow
NSWindow * nswindow
Definition: SDL_cocoawindow.h:115
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731