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1/*
2 * Copyright 2024 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "tools/window/GraphiteMetalWindowContext.h"
9#include "tools/window/ios/WindowContextFactory_ios.h"
10
11#import <Metal/Metal.h>
12#import <UIKit/UIKit.h>
13
14using skwindow::DisplayParams;
15using skwindow::IOSWindowInfo;
16using skwindow::internal::GraphiteMetalWindowContext;
17
18@interface GraphiteMetalView : MainView
19@end
20
21@implementation GraphiteMetalView
22+ (Class) layerClass {
23    return [CAMetalLayer class];
24}
25@end
26
27namespace {
28
29class GraphiteMetalWindowContext_ios : public GraphiteMetalWindowContext {
30public:
31    GraphiteMetalWindowContext_ios(const IOSWindowInfo&, const DisplayParams&);
32
33    ~GraphiteMetalWindowContext_ios() override;
34
35    bool onInitializeContext() override;
36    void onDestroyContext() override;
37
38    void resize(int w, int h) override;
39
40private:
41    sk_app::Window_ios*  fWindow;
42    UIViewController*    fViewController;
43    GraphiteMetalView*   fMetalView;
44};
45
46GraphiteMetalWindowContext_ios::GraphiteMetalWindowContext_ios(const IOSWindowInfo& info,
47                                                               const DisplayParams& params)
48    : GraphiteMetalWindowContext(params)
49    , fWindow(info.fWindow)
50    , fViewController(info.fViewController) {
51
52    // iOS test apps currently ignore MSAA settings.
53
54    this->initializeContext();
55}
56
57GraphiteMetalWindowContext_ios::~GraphiteMetalWindowContext_ios() {
58    this->destroyContext();
59    [fMetalView removeFromSuperview];
60    [fMetalView release];
61}
62
63bool GraphiteMetalWindowContext_ios::onInitializeContext() {
64    SkASSERT(fWindow != nil);
65    SkASSERT(fViewController != nil);
66
67    CGRect frameRect = [fViewController.view frame];
68    fMetalView = [[[GraphiteMetalView alloc] initWithFrame:frameRect] initWithWindow:fWindow];
69    [fViewController.view addSubview:fMetalView];
70
71    fMetalLayer = (CAMetalLayer*)fMetalView.layer;
72    fMetalLayer.device = fDevice.get();
73    fMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
74    fMetalLayer.drawableSize = frameRect.size;
75    fMetalLayer.frame = frameRect;
76    fMetalLayer.framebufferOnly = false;
77
78    fMetalLayer.contentsGravity = kCAGravityTopLeft;
79
80    fWidth = frameRect.size.width;
81    fHeight = frameRect.size.height;
82
83    return true;
84}
85
86void GraphiteMetalWindowContext_ios::onDestroyContext() {}
87
88void GraphiteMetalWindowContext_ios::resize(int w, int h) {
89    fMetalLayer.drawableSize = fMetalView.frame.size;
90    fMetalLayer.frame = fMetalView.frame;
91    fWidth = w;
92    fHeight = h;
93}
94
95}  // anonymous namespace
96
97namespace skwindow {
98
99std::unique_ptr<WindowContext> MakeGraphiteMetalForIOS(const IOSWindowInfo& info,
100                                                       const DisplayParams& params) {
101    std::unique_ptr<WindowContext> ctx(new GraphiteMetalWindowContext_ios(info, params));
102    if (!ctx->isValid()) {
103        return nullptr;
104    }
105    return ctx;
106}
107
108}  // namespace skwindow
109