1
2 /*
3 * Copyright 2015 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 #define EGL_EGL_PROTOTYPES 1
10
11 #include <EGL/egl.h>
12 #include <EGL/eglext.h>
13 #include "../GLWindowContext.h"
14 #include "WindowContextFactory_win.h"
15 #include "gl/GrGLAssembleInterface.h"
16 #include "gl/GrGLDefines.h"
17
18 using sk_app::GLWindowContext;
19 using sk_app::DisplayParams;
20
21 namespace {
22
get_angle_egl_display(HDC hdc)23 EGLDisplay get_angle_egl_display(HDC hdc) {
24 PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT;
25 eglGetPlatformDisplayEXT =
26 (PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress("eglGetPlatformDisplayEXT");
27
28 // We expect ANGLE to support this extension
29 if (!eglGetPlatformDisplayEXT) {
30 return EGL_NO_DISPLAY;
31 }
32
33 // We currently only support D3D11 ANGLE.
34 static constexpr EGLint kType = EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE;
35 static constexpr EGLint attribs[] = {EGL_PLATFORM_ANGLE_TYPE_ANGLE, kType, EGL_NONE};
36 return eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, hdc, attribs);
37 }
38
39 class ANGLEGLWindowContext_win : public GLWindowContext {
40 public:
41 ANGLEGLWindowContext_win(HWND, const DisplayParams&);
42 ~ANGLEGLWindowContext_win() override;
43
44 protected:
45 void onSwapBuffers() override;
46
47 sk_sp<const GrGLInterface> onInitializeContext() override;
48 void onDestroyContext() override;
49
50 private:
51 HWND fHWND;
52 EGLDisplay fDisplay = EGL_NO_DISPLAY;
53 EGLContext fEGLContext = EGL_NO_CONTEXT;
54 EGLSurface fEGLSurface = EGL_NO_SURFACE;
55
56 typedef GLWindowContext INHERITED;
57 };
58
ANGLEGLWindowContext_win(HWND wnd,const DisplayParams & params)59 ANGLEGLWindowContext_win::ANGLEGLWindowContext_win(HWND wnd, const DisplayParams& params)
60 : INHERITED(params), fHWND(wnd) {
61 this->initializeContext();
62 }
63
~ANGLEGLWindowContext_win()64 ANGLEGLWindowContext_win::~ANGLEGLWindowContext_win() { this->destroyContext(); }
65
onInitializeContext()66 sk_sp<const GrGLInterface> ANGLEGLWindowContext_win::onInitializeContext() {
67 HDC dc = GetDC(fHWND);
68 fDisplay = get_angle_egl_display(dc);
69 if (EGL_NO_DISPLAY == fDisplay) {
70 return nullptr;
71 }
72
73 EGLint majorVersion;
74 EGLint minorVersion;
75 if (!eglInitialize(fDisplay, &majorVersion, &minorVersion)) {
76 SkDebugf("Could not initialize display!\n");
77 return nullptr;
78 }
79 EGLint numConfigs;
80 fSampleCount = this->getDisplayParams().fMSAASampleCount;
81 const int sampleBuffers = fSampleCount > 1 ? 1 : 0;
82 const int eglSampleCnt = fSampleCount > 1 ? fSampleCount : 0;
83 const EGLint configAttribs[] = {EGL_RENDERABLE_TYPE,
84 // We currently only support ES3.
85 EGL_OPENGL_ES3_BIT,
86 EGL_RED_SIZE,
87 8,
88 EGL_GREEN_SIZE,
89 8,
90 EGL_BLUE_SIZE,
91 8,
92 EGL_ALPHA_SIZE,
93 8,
94 EGL_SAMPLE_BUFFERS,
95 sampleBuffers,
96 EGL_SAMPLES,
97 eglSampleCnt,
98 EGL_NONE};
99
100 EGLConfig surfaceConfig;
101 if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs)) {
102 SkDebugf("Could not create choose config!\n");
103 return nullptr;
104 }
105 // We currently only support ES3.
106 const EGLint contextAttribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
107 fEGLContext = eglCreateContext(fDisplay, surfaceConfig, nullptr, contextAttribs);
108 if (EGL_NO_CONTEXT == fEGLContext) {
109 SkDebugf("Could not create context!\n");
110 return nullptr;
111 }
112 fEGLSurface = eglCreateWindowSurface(fDisplay, surfaceConfig, fHWND, nullptr);
113 if (EGL_NO_SURFACE == fEGLSurface) {
114 SkDebugf("Could not create surface!\n");
115 return nullptr;
116 }
117 if (!eglMakeCurrent(fDisplay, fEGLSurface, fEGLSurface, fEGLContext)) {
118 SkDebugf("Could not make contxt current!\n");
119 return nullptr;
120 }
121
122 sk_sp<const GrGLInterface> interface(GrGLMakeAssembledInterface(
123 nullptr,
124 [](void* ctx, const char name[]) -> GrGLFuncPtr { return eglGetProcAddress(name); }));
125 if (interface) {
126 interface->fFunctions.fClearStencil(0);
127 interface->fFunctions.fClearColor(0, 0, 0, 0);
128 interface->fFunctions.fStencilMask(0xffffffff);
129 interface->fFunctions.fClear(GR_GL_STENCIL_BUFFER_BIT | GR_GL_COLOR_BUFFER_BIT);
130
131 // use DescribePixelFormat to get the stencil depth.
132 int pixelFormat = GetPixelFormat(dc);
133 PIXELFORMATDESCRIPTOR pfd;
134 DescribePixelFormat(dc, pixelFormat, sizeof(pfd), &pfd);
135 fStencilBits = pfd.cStencilBits;
136
137 RECT rect;
138 GetClientRect(fHWND, &rect);
139 fWidth = rect.right - rect.left;
140 fHeight = rect.bottom - rect.top;
141 interface->fFunctions.fViewport(0, 0, fWidth, fHeight);
142 }
143 return interface;
144 }
145
onDestroyContext()146 void ANGLEGLWindowContext_win::onDestroyContext() {
147 eglMakeCurrent(fDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
148 if (EGL_NO_CONTEXT != fEGLContext) {
149 eglDestroyContext(fDisplay, fEGLContext);
150 }
151 if (EGL_NO_SURFACE != fEGLSurface) {
152 eglDestroySurface(fDisplay, fEGLSurface);
153 }
154 if (EGL_NO_DISPLAY != fDisplay) {
155 eglTerminate(fDisplay);
156 }
157 }
158
onSwapBuffers()159 void ANGLEGLWindowContext_win::onSwapBuffers() {
160 if (!eglSwapBuffers(fDisplay, fEGLSurface)) {
161 SkDebugf("Could not complete eglSwapBuffers.\n");
162 }
163 }
164
165 } // anonymous namespace
166
167 namespace sk_app {
168 namespace window_context_factory {
169
NewANGLEForWin(HWND wnd,const DisplayParams & params)170 WindowContext* NewANGLEForWin(HWND wnd, const DisplayParams& params) {
171 ANGLEGLWindowContext_win* ctx = new ANGLEGLWindowContext_win(wnd, params);
172 if (!ctx->isValid()) {
173 delete ctx;
174 return nullptr;
175 }
176 return ctx;
177 }
178
179 } // namespace window_context_factory
180 } // namespace sk_app
181