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// Copyright 2022 The Dawn Authors
//
// 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
//
// http://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 "dawn/native/opengl/ContextEGL.h"
#include <memory>
#include <vector>
#include "dawn/native/opengl/UtilsEGL.h"
namespace dawn::native::opengl {
ResultOrError<std::unique_ptr<ContextEGL>> ContextEGL::Create(const EGLFunctions& egl,
EGLenum api) {
EGLDisplay display = egl.GetCurrentDisplay();
if (display == EGL_NO_DISPLAY) {
display = egl.GetDisplay(EGL_DEFAULT_DISPLAY);
}
DAWN_INVALID_IF(display == EGL_NO_DISPLAY, "eglGetDisplay");
EGLint renderableType = api == EGL_OPENGL_ES_API ? EGL_OPENGL_ES3_BIT : EGL_OPENGL_BIT;
EGLint major, minor;
DAWN_TRY(CheckEGL(egl, egl.Initialize(display, &major, &minor), "eglInitialize"));
// We use EGLImage unconditionally, which only became core in 1.5.
DAWN_INVALID_IF(major < 1 || (major == 1 && minor < 5),
"EGL version (%u.%u) must be at least 1.5", major, minor);
// Since we're creating a surfaceless context, the only thing we really care
// about is the RENDERABLE_TYPE.
EGLint config_attribs[] = {EGL_RENDERABLE_TYPE, renderableType, EGL_NONE};
EGLint num_config;
EGLConfig config;
DAWN_TRY(CheckEGL(egl, egl.ChooseConfig(display, config_attribs, &config, 1, &num_config),
"eglChooseConfig"));
DAWN_INVALID_IF(num_config == 0, "eglChooseConfig returned zero configs");
DAWN_TRY(CheckEGL(egl, egl.BindAPI(api), "eglBindAPI"));
if (api == EGL_OPENGL_ES_API) {
major = 3;
minor = 1;
} else {
major = 4;
minor = 4;
}
const char* extensions = egl.QueryString(display, EGL_EXTENSIONS);
if (strstr(extensions, "EGL_EXT_create_context_robustness") == nullptr) {
return DAWN_INTERNAL_ERROR("EGL_EXT_create_context_robustness must be supported");
}
EGLint attrib_list[] = {
EGL_CONTEXT_MAJOR_VERSION,
major,
EGL_CONTEXT_MINOR_VERSION,
minor,
EGL_CONTEXT_OPENGL_ROBUST_ACCESS, // Core in EGL 1.5
EGL_TRUE,
EGL_NONE,
};
EGLContext context = egl.CreateContext(display, config, EGL_NO_CONTEXT, attrib_list);
DAWN_TRY(CheckEGL(egl, context != EGL_NO_CONTEXT, "eglCreateContext"));
return std::unique_ptr<ContextEGL>(new ContextEGL(egl, display, context));
}
void ContextEGL::MakeCurrent() {
egl.MakeCurrent(mDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, mContext);
}
ContextEGL::~ContextEGL() {
egl.DestroyContext(mDisplay, mContext);
}
} // namespace dawn::native::opengl