148 lines
5.1 KiB
C++
148 lines
5.1 KiB
C++
/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#include "tensorflow/lite/delegates/gpu/gl/egl_context.h"
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#include <cstring>
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#include "tensorflow/lite/delegates/gpu/common/status.h"
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#include "tensorflow/lite/delegates/gpu/gl/gl_call.h"
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#include "tensorflow/lite/delegates/gpu/gl/gl_errors.h"
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namespace tflite {
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namespace gpu {
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namespace gl {
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namespace {
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absl::Status GetConfig(EGLDisplay display, const EGLint* attributes,
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EGLConfig* config) {
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EGLint config_count;
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bool chosen = eglChooseConfig(display, attributes, config, 1, &config_count);
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RETURN_IF_ERROR(GetOpenGlErrors());
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if (!chosen || config_count == 0) {
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return absl::InternalError("No EGL error, but eglChooseConfig failed.");
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}
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return absl::OkStatus();
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}
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absl::Status CreateContext(EGLDisplay display, EGLContext shared_context,
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EGLConfig config, EglContext* egl_context) {
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static const EGLint attributes[] = {EGL_CONTEXT_CLIENT_VERSION, 3,
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#ifdef _DEBUG // Add debugging bit
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EGL_CONTEXT_FLAGS_KHR,
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EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR,
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#endif
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EGL_NONE};
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EGLContext context =
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eglCreateContext(display, config, shared_context, attributes);
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RETURN_IF_ERROR(GetOpenGlErrors());
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if (context == EGL_NO_CONTEXT) {
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return absl::InternalError("No EGL error, but eglCreateContext failed.");
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}
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*egl_context = EglContext(context, display, config, true);
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return absl::OkStatus();
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}
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bool HasExtension(EGLDisplay display, const char* name) {
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return std::strstr(eglQueryString(display, EGL_EXTENSIONS), name);
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}
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} // namespace
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void EglContext::Invalidate() {
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if (context_ != EGL_NO_CONTEXT) {
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if (has_ownership_) {
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eglMakeCurrent(display_, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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eglDestroyContext(display_, context_);
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}
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context_ = EGL_NO_CONTEXT;
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}
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has_ownership_ = false;
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}
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EglContext::EglContext(EglContext&& other)
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: context_(other.context_),
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display_(other.display_),
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config_(other.config_),
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has_ownership_(other.has_ownership_) {
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other.context_ = EGL_NO_CONTEXT;
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other.has_ownership_ = false;
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}
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EglContext& EglContext::operator=(EglContext&& other) {
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if (this != &other) {
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Invalidate();
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using std::swap;
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swap(context_, other.context_);
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display_ = other.display_;
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config_ = other.config_;
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swap(has_ownership_, other.has_ownership_);
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}
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return *this;
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}
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absl::Status EglContext::MakeCurrent(EGLSurface read, EGLSurface write) {
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bool is_made_current = eglMakeCurrent(display_, write, read, context_);
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RETURN_IF_ERROR(GetOpenGlErrors());
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if (!is_made_current) {
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return absl::InternalError("No EGL error, but eglMakeCurrent failed.");
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}
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return absl::OkStatus();
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}
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bool EglContext::IsCurrent() const {
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return context_ == eglGetCurrentContext();
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}
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absl::Status CreateConfiglessContext(EGLDisplay display,
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EGLContext shared_context,
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EglContext* egl_context) {
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if (!HasExtension(display, "EGL_KHR_no_config_context")) {
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return absl::UnavailableError("EGL_KHR_no_config_context not supported");
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}
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return CreateContext(display, shared_context, EGL_NO_CONFIG_KHR, egl_context);
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}
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absl::Status CreateSurfacelessContext(EGLDisplay display,
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EGLContext shared_context,
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EglContext* egl_context) {
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if (!HasExtension(display, "EGL_KHR_create_context")) {
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return absl::UnavailableError("EGL_KHR_create_context not supported");
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}
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if (!HasExtension(display, "EGL_KHR_surfaceless_context")) {
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return absl::UnavailableError("EGL_KHR_surfaceless_context not supported");
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}
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const EGLint attributes[] = {EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT_KHR,
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EGL_NONE};
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EGLConfig config;
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RETURN_IF_ERROR(GetConfig(display, attributes, &config));
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return CreateContext(display, shared_context, config, egl_context);
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}
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absl::Status CreatePBufferContext(EGLDisplay display, EGLContext shared_context,
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EglContext* egl_context) {
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const EGLint attributes[] = {
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EGL_SURFACE_TYPE, EGL_PBUFFER_BIT, EGL_BIND_TO_TEXTURE_RGB,
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EGL_TRUE, EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT_KHR,
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EGL_NONE};
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EGLConfig config;
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RETURN_IF_ERROR(GetConfig(display, attributes, &config));
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return CreateContext(display, shared_context, config, egl_context);
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}
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} // namespace gl
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} // namespace gpu
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} // namespace tflite
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