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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "src/egl.h"
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <X11/Xlib.h>
#include <exception>
#include <new>
#include <stdexcept>
#include <utility>
#include <vector>
#include "src/undo_xlib_dot_h_namespace_pollution.h"
//
#include "src/util.h"
#include "third_party/abseil/absl/container/btree_map.h"
#include "third_party/abseil/absl/types/optional.h"
namespace egl {
namespace {
// Converts an EGL error into a standard C++ exception.
std::exception ExceptionFromErrorCode(EGLint error) noexcept {
DCHECK(error != EGL_SUCCESS);
switch (error) {
case EGL_NOT_INITIALIZED:
return std::logic_error("EGL: uninitialized");
case EGL_BAD_ACCESS:
return std::logic_error("EGL: bad access");
case EGL_BAD_ALLOC:
return std::bad_alloc();
case EGL_BAD_ATTRIBUTE:
return std::invalid_argument(
"EGL: unrecognized attribute or attribute value");
case EGL_BAD_CONTEXT:
return std::invalid_argument("EGL: invalid context");
case EGL_BAD_CONFIG:
return std::invalid_argument("EGL: invalid configuration");
case EGL_BAD_CURRENT_SURFACE:
return std::invalid_argument("EGL: current surface is no longer valid");
case EGL_BAD_DISPLAY:
return std::invalid_argument("EGL: invalid display");
case EGL_BAD_SURFACE:
return std::invalid_argument("EGL: invalid surface");
case EGL_BAD_MATCH:
return std::invalid_argument("EGL: inconsistent arguments");
case EGL_BAD_PARAMETER:
return std::invalid_argument("EGL: invalid argument");
case EGL_BAD_NATIVE_PIXMAP:
return std::invalid_argument("EGL: invalid native pixmap");
case EGL_BAD_NATIVE_WINDOW:
return std::invalid_argument("EGL: invalid native window");
case EGL_CONTEXT_LOST:
return std::runtime_error(
"EGL: context lost due to power management event");
default:
return std::runtime_error("EGL: error");
}
}
// Checks the specified result against `error`. If it is indeed `error`, gets
// the associated EGL error and throws it as an exception.
template <typename T>
T SentinelCheckedCall(T error, T result) {
if (result == error) {
throw ExceptionFromErrorCode(eglGetError());
}
return result;
}
// A variant of SentinelCheckedCall that checks for `false` returns.
void CheckedCall(bool result) { SentinelCheckedCall(false, result); }
// Converts an egl::AttributeList into the format expected by EGL's C APIs.
std::vector<EGLint> MarshalAttributeList(
const absl::btree_map<EGLint, EGLint>& attribs) {
std::vector<EGLint> r;
r.reserve(2 * attribs.size() + 1);
for (auto& [key, val] : attribs) {
r.push_back(key);
r.push_back(val);
}
r.push_back(EGL_NONE);
return r;
}
} // namespace
int Configuration::Get(Attribute attribute) const {
EGLint r;
CheckedCall(eglGetConfigAttrib(display_, config_, attribute, &r));
return r;
}
void Surface::SwapBuffers() { CheckedCall(eglSwapBuffers(display_, surface_)); }
Display::Display(::Display* xlib_display)
: display_(SentinelCheckedCall(
EGL_NO_DISPLAY,
eglGetPlatformDisplay(EGL_PLATFORM_X11_KHR, xlib_display,
/*attrib_list=*/nullptr))) {
EGLint major, minor;
CheckedCall(eglInitialize(display_, &major, &minor));
}
Display::~Display() noexcept {
// This should always succeed, since display_ is guaranteed valid.
DCHECK(eglTerminate(display_));
}
std::vector<Configuration> Display::GetConfigurations(
const std::vector<std::pair<Attribute, int>>& filter_attributes,
absl::optional<int> limit) const {
// Create the actual attribute list that we're going to pass to
// eglChooseConfig.
std::vector<EGLint> marshaled_attributes;
marshaled_attributes.reserve(2 * filter_attributes.size() + 1);
for (auto& [key, value] : filter_attributes) {
marshaled_attributes.push_back(key);
marshaled_attributes.push_back(value);
}
marshaled_attributes.push_back(EGL_NONE);
// Determine how many configs we want.
EGLint num_configs;
if (limit.has_value()) {
num_configs = *limit;
} else {
CheckedCall(eglChooseConfig(display_, marshaled_attributes.data(),
/*configs=*/nullptr,
/*config_size=*/0, &num_configs));
}
// Actually get the configs.
std::vector<EGLConfig> egl_configs(num_configs);
CheckedCall(eglChooseConfig(display_, marshaled_attributes.data(),
egl_configs.data(), egl_configs.size(),
&num_configs));
// Wrap the configs in Configuration objects.
std::vector<Configuration> r;
r.reserve(num_configs);
for (auto egl_config : egl_configs) {
r.push_back(Configuration(display_, egl_config));
}
return r;
}
Surface Display::CreateWindowSurface(const Configuration& config,
::Window window) {
return Surface(
display_,
SentinelCheckedCall(EGL_NO_SURFACE, eglCreatePlatformWindowSurface(
display_, config.config_, &window,
/*attrib_list=*/nullptr)));
}
Context Display::CreateContext(const Configuration& config, Api api, int major,
int minor) {
absl::btree_map<EGLint, EGLint> attributes = {
{EGL_CONTEXT_MAJOR_VERSION, major}, {EGL_CONTEXT_MINOR_VERSION, minor}};
#ifndef NDEBUG
attributes[EGL_CONTEXT_OPENGL_DEBUG] = EGL_TRUE;
#endif
CheckedCall(eglBindAPI(FromEnum(api)));
return Context(
display_, SentinelCheckedCall(
EGL_NO_CONTEXT,
eglCreateContext(display_, config.config_,
/*share_context=*/EGL_NO_CONTEXT,
MarshalAttributeList(attributes).data())));
}
void BindContext(Surface& surface, Context& context) {
DCHECK(surface.display_ == context.display_);
CheckedCall(eglMakeCurrent(surface.display_, /*draw=*/surface.surface_,
/*read=*/surface.surface_, context.context_));
}
} // namespace egl
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