| Flutter Impeller |

display.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "impeller/toolkit/egl/display.h"
6
7 #include <vector>
8
9 #include "impeller/toolkit/egl/context.h"
10 #include "impeller/toolkit/egl/surface.h"
11
12 namespace impeller {
13 namespace egl {
14
15 Display::Display() {
16 EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
17
18 if (::eglInitialize(display, nullptr, nullptr) != EGL_TRUE) {
19 IMPELLER_LOG_EGL_ERROR;
20 return;
21 }
22 display_ = display;
23 }
24
25 Display::~Display() {
26 if (display_ != EGL_NO_DISPLAY) {
27 if (::eglTerminate(display_) != EGL_TRUE) {
28 IMPELLER_LOG_EGL_ERROR;
29 }
30 }
31 }
32
33 bool Display::IsValid() const {
34 return display_ != EGL_NO_DISPLAY;
35 }
36
37 std::unique_ptr<Context> Display::CreateContext(const Config& config,
38 const Context* share_context) {
39 const auto& desc = config.GetDescriptor();
40
41 std::vector<EGLint> attributes;
42 switch (desc.api) {
43 case API::kOpenGL:
44 break;
45 case API::kOpenGLES2:
46 attributes.push_back(EGL_CONTEXT_CLIENT_VERSION);
47 attributes.push_back(2);
48 break;
49 case API::kOpenGLES3:
50 attributes.push_back(EGL_CONTEXT_CLIENT_VERSION);
51 attributes.push_back(3);
52 break;
53 }
54 // Termination sentinel must be present.
55 attributes.push_back(EGL_NONE);
56
57 auto context = ::eglCreateContext(
58 display_, // display
59 config.GetHandle(), // config
60 share_context != nullptr ? share_context->GetHandle() : nullptr, // share
61 attributes.data() // attributes
62 );
63
64 if (context == EGL_NO_CONTEXT) {
65 IMPELLER_LOG_EGL_ERROR;
66 return nullptr;
67 }
68
69 return std::unique_ptr<Context>(new Context(display_, context));
70 }
71
72 std::unique_ptr<Config> Display::ChooseConfig(ConfigDescriptor config) const {
73 if (!display_) {
74 return nullptr;
75 }
76
77 std::vector<EGLint> attributes;
78
79 {
80 attributes.push_back(EGL_RENDERABLE_TYPE);
81 switch (config.api) {
82 case API::kOpenGL:
83 attributes.push_back(EGL_OPENGL_BIT);
84 break;
85 case API::kOpenGLES2:
86 attributes.push_back(EGL_OPENGL_ES2_BIT);
87 break;
88 case API::kOpenGLES3:
89 attributes.push_back(EGL_OPENGL_ES3_BIT);
90 break;
91 }
92 }
93
94 {
95 attributes.push_back(EGL_SURFACE_TYPE);
96 switch (config.surface_type) {
97 case SurfaceType::kWindow:
98 attributes.push_back(EGL_WINDOW_BIT);
99 break;
100 case SurfaceType::kPBuffer:
101 attributes.push_back(EGL_PBUFFER_BIT);
102 break;
103 }
104 }
105
106 {
107 switch (config.color_format) {
108 case ColorFormat::kRGBA8888:
109 attributes.push_back(EGL_RED_SIZE);
110 attributes.push_back(8);
111 attributes.push_back(EGL_GREEN_SIZE);
112 attributes.push_back(8);
113 attributes.push_back(EGL_BLUE_SIZE);
114 attributes.push_back(8);
115 attributes.push_back(EGL_ALPHA_SIZE);
116 attributes.push_back(8);
117 break;
118 case ColorFormat::kRGB565:
119 attributes.push_back(EGL_RED_SIZE);
120 attributes.push_back(5);
121 attributes.push_back(EGL_GREEN_SIZE);
122 attributes.push_back(6);
123 attributes.push_back(EGL_BLUE_SIZE);
124 attributes.push_back(5);
125 break;
126 }
127 }
128
129 {
130 attributes.push_back(EGL_DEPTH_SIZE);
131 attributes.push_back(static_cast<EGLint>(config.depth_bits));
132 }
133
134 {
135 attributes.push_back(EGL_STENCIL_SIZE);
136 attributes.push_back(static_cast<EGLint>(config.stencil_bits));
137 }
138
139 {
140 const auto sample_count = static_cast<EGLint>(config.samples);
141 if (sample_count > 1) {
142 attributes.push_back(EGL_SAMPLE_BUFFERS);
143 attributes.push_back(1);
144 attributes.push_back(EGL_SAMPLES);
145 attributes.push_back(sample_count);
146 }
147 }
148
149 // termination sentinel must be present.
150 attributes.push_back(EGL_NONE);
151
152 EGLConfig config_out = nullptr;
153 EGLint config_count_out = 0;
154 if (::eglChooseConfig(display_, // display
155 attributes.data(), // attributes (null terminated)
156 &config_out, // matched configs
157 1, // configs array size
158 &config_count_out // match configs count
159 ) != EGL_TRUE) {
160 IMPELLER_LOG_EGL_ERROR;
161 return nullptr;
162 }
163
164 if (config_count_out != 1u) {
165 IMPELLER_LOG_EGL_ERROR;
166 return nullptr;
167 }
168
169 return std::make_unique<Config>(config, config_out);
170 }
171
172 std::unique_ptr<Surface> Display::CreateWindowSurface(
173 const Config& config,
174 EGLNativeWindowType window) {
175 const EGLint attribs[] = {EGL_NONE};
176 auto surface = ::eglCreateWindowSurface(display_, // display
177 config.GetHandle(), // config
178 window, // window
179 attribs // attrib_list
180 );
181 if (surface == EGL_NO_SURFACE) {
182 IMPELLER_LOG_EGL_ERROR;
183 return nullptr;
184 }
185 return std::unique_ptr<Surface>(new Surface(display_, surface));
186 }
187
188 std::unique_ptr<Surface> Display::CreatePixelBufferSurface(const Config& config,
189 size_t width,
190 size_t height) {
191 // clang-format off
192 const EGLint attribs[] = {
193 EGL_WIDTH, static_cast<EGLint>(width),
194 EGL_HEIGHT, static_cast<EGLint>(height),
195 EGL_NONE
196 };
197 // clang-format on
198 auto surface = ::eglCreatePbufferSurface(display_, // display
199 config.GetHandle(), // config
200 attribs // attrib_list
201 );
202 if (surface == EGL_NO_SURFACE) {
203 IMPELLER_LOG_EGL_ERROR;
204 return nullptr;
205 }
206 return std::unique_ptr<Surface>(new Surface(display_, surface));
207 }
208
209 const EGLDisplay& Display::GetHandle() const {
210 return display_;
211 }
212
213 } // namespace egl
214 } // namespace impeller
impeller::egl::Context::GetHandle
const EGLContext & GetHandle() const
Get the underlying handle to the EGL context.
Definition: context.cc:27
impeller::egl::ColorFormat::kRGB565
@ kRGB565
impeller::egl::Display::CreateWindowSurface
virtual std::unique_ptr< Surface > CreateWindowSurface(const Config &config, EGLNativeWindowType window)
Create a window surface. The window is an opaque pointer whose value value is platform specific....
Definition: display.cc:172
impeller::egl::Display::GetHandle
const EGLDisplay & GetHandle() const
Definition: display.cc:209
impeller::egl::Config::GetDescriptor
const ConfigDescriptor & GetDescriptor() const
Definition: config.cc:17
impeller::egl::Surface
An instance of an EGL surface. There is no ability to create surfaces directly. Instead,...
Definition: surface.h:18
impeller::egl::Context
An instance of an EGL context.
Definition: context.h:30
impeller::egl::ConfigDescriptor::samples
Samples samples
Definition: config.h:47
impeller::egl::API::kOpenGLES2
@ kOpenGLES2
impeller::egl::Display::ChooseConfig
virtual std::unique_ptr< Config > ChooseConfig(ConfigDescriptor config) const
Choose a config that most closely matches a given descriptor. If there are no matches,...
Definition: display.cc:72
impeller::egl::Config::GetHandle
const EGLConfig & GetHandle() const
Definition: config.cc:21
impeller::egl::Display::CreateContext
virtual std::unique_ptr< Context > CreateContext(const Config &config, const Context *share_context)
Create a context with a supported config. The supported config can be obtained via a successful call ...
Definition: display.cc:37
context.h
impeller::egl::Display::CreatePixelBufferSurface
virtual std::unique_ptr< Surface > CreatePixelBufferSurface(const Config &config, size_t width, size_t height)
Create an offscreen pixelbuffer surface. These are of limited use except in the context where applica...
Definition: display.cc:188
impeller::egl::ConfigDescriptor::surface_type
SurfaceType surface_type
Definition: config.h:51
impeller::egl::ConfigDescriptor
Definition: config.h:45
display.h
surface.h
impeller::egl::API::kOpenGL
@ kOpenGL
impeller::egl::SurfaceType::kWindow
@ kWindow
IMPELLER_LOG_EGL_ERROR
#define IMPELLER_LOG_EGL_ERROR
Definition: egl.h:25
impeller::egl::Display::IsValid
virtual bool IsValid() const
Definition: display.cc:33
impeller::egl::ColorFormat::kRGBA8888
@ kRGBA8888
impeller::egl::Config
An EGL config. These are returned by the display to indicate support for a specific config descriptor...
Definition: config.h:63
impeller::egl::Display::Display
Display()
Definition: display.cc:15
impeller::egl::Display::~Display
virtual ~Display()
Definition: display.cc:25
impeller::egl::ConfigDescriptor::color_format
ColorFormat color_format
Definition: config.h:48
impeller
Definition: allocation.cc:12
impeller::egl::API::kOpenGLES3
@ kOpenGLES3
impeller::egl::SurfaceType::kPBuffer
@ kPBuffer
impeller::egl::ConfigDescriptor::stencil_bits
StencilBits stencil_bits
Definition: config.h:49
impeller::egl::ConfigDescriptor::api
API api
Definition: config.h:46
impeller::egl::ConfigDescriptor::depth_bits
DepthBits depth_bits
Definition: config.h:50