1 /* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15
16 #include "tensorflow/lite/delegates/gpu/gl/egl_environment.h"
17
18 #include "absl/memory/memory.h"
19 #include "tensorflow/lite/delegates/gpu/common/status.h"
20 #include "tensorflow/lite/delegates/gpu/gl/gl_call.h"
21 #include "tensorflow/lite/delegates/gpu/gl/request_gpu_info.h"
22
23 namespace tflite {
24 namespace gpu {
25 namespace gl {
26 namespace {
27
28 // TODO(akulik): detect power management event when all contexts are destroyed
29 // and OpenGL ES is reinitialized. See eglMakeCurrent
30
InitDisplay(EGLDisplay * egl_display)31 absl::Status InitDisplay(EGLDisplay* egl_display) {
32 RETURN_IF_ERROR(
33 TFLITE_GPU_CALL_EGL(eglGetDisplay, egl_display, EGL_DEFAULT_DISPLAY));
34 if (*egl_display == EGL_NO_DISPLAY) {
35 return absl::UnavailableError("eglGetDisplay returned nullptr");
36 }
37 bool is_initialized;
38 RETURN_IF_ERROR(TFLITE_GPU_CALL_EGL(eglInitialize, &is_initialized,
39 *egl_display, nullptr, nullptr));
40 if (!is_initialized) {
41 return absl::InternalError("No EGL error, but eglInitialize failed");
42 }
43 return absl::OkStatus();
44 }
45
46 } // namespace
47
NewEglEnvironment(std::unique_ptr<EglEnvironment> * egl_environment)48 absl::Status EglEnvironment::NewEglEnvironment(
49 std::unique_ptr<EglEnvironment>* egl_environment) {
50 *egl_environment = absl::make_unique<EglEnvironment>();
51 RETURN_IF_ERROR((*egl_environment)->Init());
52 return absl::OkStatus();
53 }
54
~EglEnvironment()55 EglEnvironment::~EglEnvironment() {
56 if (dummy_framebuffer_ != GL_INVALID_INDEX) {
57 glDeleteFramebuffers(1, &dummy_framebuffer_);
58 }
59 if (dummy_texture_ != GL_INVALID_INDEX) {
60 glDeleteTextures(1, &dummy_texture_);
61 }
62 }
63
Init()64 absl::Status EglEnvironment::Init() {
65 bool is_bound;
66 RETURN_IF_ERROR(
67 TFLITE_GPU_CALL_EGL(eglBindAPI, &is_bound, EGL_OPENGL_ES_API));
68 if (!is_bound) {
69 return absl::InternalError("No EGL error, but eglBindAPI failed");
70 }
71
72 // Re-use context and display if it was created on this thread.
73 if (eglGetCurrentContext() != EGL_NO_CONTEXT) {
74 display_ = eglGetCurrentDisplay();
75 context_ =
76 EglContext(eglGetCurrentContext(), display_, EGL_NO_CONFIG_KHR, false);
77 } else {
78 RETURN_IF_ERROR(InitDisplay(&display_));
79
80 absl::Status status = InitConfiglessContext();
81 if (!status.ok()) {
82 status = InitSurfacelessContext();
83 }
84 if (!status.ok()) {
85 status = InitPBufferContext();
86 }
87 if (!status.ok()) {
88 return status;
89 }
90 }
91
92 if (gpu_info_.vendor == GpuVendor::kUnknown) {
93 RETURN_IF_ERROR(RequestGpuInfo(&gpu_info_));
94 }
95 // TODO(akulik): when do we need ForceSyncTurning?
96 ForceSyncTurning();
97 return absl::OkStatus();
98 }
99
InitConfiglessContext()100 absl::Status EglEnvironment::InitConfiglessContext() {
101 RETURN_IF_ERROR(CreateConfiglessContext(display_, EGL_NO_CONTEXT, &context_));
102 return context_.MakeCurrentSurfaceless();
103 }
104
InitSurfacelessContext()105 absl::Status EglEnvironment::InitSurfacelessContext() {
106 RETURN_IF_ERROR(
107 CreateSurfacelessContext(display_, EGL_NO_CONTEXT, &context_));
108 RETURN_IF_ERROR(context_.MakeCurrentSurfaceless());
109
110 // PowerVR support EGL_KHR_surfaceless_context, but glFenceSync crashes on
111 // PowerVR when it is surface-less.
112 RETURN_IF_ERROR(RequestGpuInfo(&gpu_info_));
113 if (gpu_info_.IsPowerVR()) {
114 return absl::UnavailableError(
115 "Surface-less context is not properly supported on powervr.");
116 }
117 return absl::OkStatus();
118 }
119
InitPBufferContext()120 absl::Status EglEnvironment::InitPBufferContext() {
121 RETURN_IF_ERROR(CreatePBufferContext(display_, EGL_NO_CONTEXT, &context_));
122 RETURN_IF_ERROR(CreatePbufferRGBSurface(context_.config(), display_, 1, 1,
123 &surface_read_));
124 RETURN_IF_ERROR(CreatePbufferRGBSurface(context_.config(), display_, 1, 1,
125 &surface_draw_));
126 return context_.MakeCurrent(surface_read_.surface(), surface_draw_.surface());
127 }
128
ForceSyncTurning()129 void EglEnvironment::ForceSyncTurning() {
130 glGenFramebuffers(1, &dummy_framebuffer_);
131 glBindFramebuffer(GL_FRAMEBUFFER, dummy_framebuffer_);
132
133 glGenTextures(1, &dummy_texture_);
134 glBindTexture(GL_TEXTURE_2D, dummy_texture_);
135 glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 4, 4);
136 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
137 dummy_texture_, 0);
138
139 GLenum draw_buffers[1] = {GL_COLOR_ATTACHMENT0};
140 glDrawBuffers(1, draw_buffers);
141
142 glViewport(0, 0, 4, 4);
143 glClear(GL_COLOR_BUFFER_BIT);
144 }
145
146 } // namespace gl
147 } // namespace gpu
148 } // namespace tflite
149