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1
2/*
3 * Copyright 2019 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#include "include/core/SkCanvas.h"
10#include "include/core/SkColorFilter.h"
11#include "include/gpu/gl/GrGLInterface.h"
12#include "tools/ToolUtils.h"
13#include "tools/sk_app/GLWindowContext.h"
14#include "tools/sk_app/mac/WindowContextFactory_mac.h"
15
16#include <OpenGL/gl.h>
17
18#include <Cocoa/Cocoa.h>
19
20using sk_app::DisplayParams;
21using sk_app::window_context_factory::MacWindowInfo;
22using sk_app::GLWindowContext;
23
24namespace {
25
26// TODO: This still uses GL to handle the update rather than using a purely raster backend,
27// for historical reasons. Writing a pure raster backend would be better in the long run.
28
29class RasterWindowContext_mac : public GLWindowContext {
30public:
31    RasterWindowContext_mac(const MacWindowInfo&, const DisplayParams&);
32
33    ~RasterWindowContext_mac() override;
34
35    sk_sp<SkSurface> getBackbufferSurface() override;
36
37    void onSwapBuffers() override;
38
39    sk_sp<const GrGLInterface> onInitializeContext() override;
40    void onDestroyContext() override {}
41
42    void resize(int w, int h) override;
43
44private:
45    NSView*              fMainView;
46    NSOpenGLContext*     fGLContext;
47    NSOpenGLPixelFormat* fPixelFormat;
48    sk_sp<SkSurface>     fBackbufferSurface;
49
50    using INHERITED = GLWindowContext;
51};
52
53RasterWindowContext_mac::RasterWindowContext_mac(const MacWindowInfo& info,
54                                                 const DisplayParams& params)
55    : INHERITED(params)
56    , fMainView(info.fMainView)
57    , fGLContext(nil) {
58
59    // any config code here (particularly for msaa)?
60
61    this->initializeContext();
62}
63
64RasterWindowContext_mac::~RasterWindowContext_mac() {
65    [NSOpenGLContext clearCurrentContext];
66    [fPixelFormat release];
67    fPixelFormat = nil;
68    [fGLContext release];
69    fGLContext = nil;
70}
71
72sk_sp<const GrGLInterface> RasterWindowContext_mac::onInitializeContext() {
73    SkASSERT(nil != fMainView);
74
75    if (!fGLContext) {
76        // set up pixel format
77        constexpr int kMaxAttributes = 18;
78        NSOpenGLPixelFormatAttribute attributes[kMaxAttributes];
79        int numAttributes = 0;
80        attributes[numAttributes++] = NSOpenGLPFAAccelerated;
81        attributes[numAttributes++] = NSOpenGLPFAClosestPolicy;
82        attributes[numAttributes++] = NSOpenGLPFADoubleBuffer;
83        attributes[numAttributes++] = NSOpenGLPFAOpenGLProfile;
84        attributes[numAttributes++] = NSOpenGLProfileVersion3_2Core;
85        attributes[numAttributes++] = NSOpenGLPFAColorSize;
86        attributes[numAttributes++] = 24;
87        attributes[numAttributes++] = NSOpenGLPFAAlphaSize;
88        attributes[numAttributes++] = 8;
89        attributes[numAttributes++] = NSOpenGLPFADepthSize;
90        attributes[numAttributes++] = 0;
91        attributes[numAttributes++] = NSOpenGLPFAStencilSize;
92        attributes[numAttributes++] = 8;
93        if (fDisplayParams.fMSAASampleCount > 1) {
94            attributes[numAttributes++] = NSOpenGLPFASampleBuffers;
95            attributes[numAttributes++] = 1;
96            attributes[numAttributes++] = NSOpenGLPFASamples;
97            attributes[numAttributes++] = fDisplayParams.fMSAASampleCount;
98        } else {
99            attributes[numAttributes++] = NSOpenGLPFASampleBuffers;
100            attributes[numAttributes++] = 0;
101        }
102        attributes[numAttributes++] = 0;
103        SkASSERT(numAttributes <= kMaxAttributes);
104
105        fPixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
106        if (nil == fPixelFormat) {
107            return nullptr;
108        }
109
110        // create context
111        fGLContext = [[NSOpenGLContext alloc] initWithFormat:fPixelFormat shareContext:nil];
112        if (nil == fGLContext) {
113            [fPixelFormat release];
114            fPixelFormat = nil;
115            return nullptr;
116        }
117
118        [fMainView setWantsBestResolutionOpenGLSurface:YES];
119        [fGLContext setView:fMainView];
120
121        GLint swapInterval = fDisplayParams.fDisableVsync ? 0 : 1;
122        [fGLContext setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
123    }
124
125    // make context current
126    [fGLContext makeCurrentContext];
127
128    glClearStencil(0);
129    glClearColor(0, 0, 0, 255);
130    glStencilMask(0xffffffff);
131    glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
132
133    GLint stencilBits;
134    [fPixelFormat getValues:&stencilBits forAttribute:NSOpenGLPFAStencilSize forVirtualScreen:0];
135    fStencilBits = stencilBits;
136    GLint sampleCount;
137    [fPixelFormat getValues:&sampleCount forAttribute:NSOpenGLPFASamples forVirtualScreen:0];
138    fSampleCount = sampleCount;
139    fSampleCount = std::max(fSampleCount, 1);
140
141    CGFloat backingScaleFactor = sk_app::GetBackingScaleFactor(fMainView);
142    fWidth = fMainView.bounds.size.width * backingScaleFactor;
143    fHeight = fMainView.bounds.size.height * backingScaleFactor;
144    glViewport(0, 0, fWidth, fHeight);
145
146    // make the offscreen image
147    SkImageInfo info = SkImageInfo::Make(fWidth, fHeight, fDisplayParams.fColorType,
148                                         kPremul_SkAlphaType, fDisplayParams.fColorSpace);
149    fBackbufferSurface = SkSurface::MakeRaster(info);
150    return GrGLMakeNativeInterface();
151}
152
153sk_sp<SkSurface> RasterWindowContext_mac::getBackbufferSurface() { return fBackbufferSurface; }
154
155void RasterWindowContext_mac::onSwapBuffers() {
156    if (fBackbufferSurface) {
157        // We made/have an off-screen surface. Get the contents as an SkImage:
158        sk_sp<SkImage> snapshot = fBackbufferSurface->makeImageSnapshot();
159
160        sk_sp<SkSurface> gpuSurface = INHERITED::getBackbufferSurface();
161        SkCanvas* gpuCanvas = gpuSurface->getCanvas();
162        gpuCanvas->drawImage(snapshot, 0, 0);
163        gpuCanvas->flush();
164
165        [fGLContext flushBuffer];
166    }
167}
168
169void RasterWindowContext_mac::resize(int w, int h) {
170    [fGLContext update];
171
172    // The super class always recreates the context.
173    INHERITED::resize(0, 0);
174}
175
176}  // anonymous namespace
177
178namespace sk_app {
179namespace window_context_factory {
180
181std::unique_ptr<WindowContext> MakeRasterForMac(const MacWindowInfo& info,
182                                                const DisplayParams& params) {
183    std::unique_ptr<WindowContext> ctx(new RasterWindowContext_mac(info, params));
184    if (!ctx->isValid()) {
185        return nullptr;
186    }
187    return ctx;
188}
189
190}  // namespace window_context_factory
191}  // namespace sk_app
192