host/gl/OpenGLESDispatch/OpenGLDispatchLoader.cpp

// Copyright (C) 2017 The Android Open Source Project
//
// 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 "OpenGLESDispatch/OpenGLDispatchLoader.h"

#include "OpenGLESDispatch/DispatchTables.h"

namespace gfxstream {
namespace gl {

GLESv1Dispatch s_gles1;
GLESv2Dispatch s_gles2;

// Must be declared outside of LazyLoaded*Dispatch scope due to the use of
// sizeof(T) within the template definition.
static LazyLoadedGLESv1Dispatch* sGLESv1Dispatch() {
    static LazyLoadedGLESv1Dispatch* l = new LazyLoadedGLESv1Dispatch;
    return l;
}
static LazyLoadedGLESv2Dispatch* sGLESv2Dispatch() {
    static LazyLoadedGLESv2Dispatch* l = new LazyLoadedGLESv2Dispatch;
    return l;
}
static LazyLoadedEGLDispatch* sEGLDispatch() {
    static LazyLoadedEGLDispatch* l = new LazyLoadedEGLDispatch;
    return l;
}

// static
const GLESv1Dispatch* LazyLoadedGLESv1Dispatch::get() {
    LazyLoadedGLESv1Dispatch* instance = sGLESv1Dispatch();
    if (instance->mValid) {
        return &s_gles1;
    } else {
        return nullptr;
    }
}

LazyLoadedGLESv1Dispatch::LazyLoadedGLESv1Dispatch() {
    LazyLoadedEGLDispatch::get();
    mValid = gles1_dispatch_init(&s_gles1);
}

// static
const GLESv2Dispatch* LazyLoadedGLESv2Dispatch::get() {
    LazyLoadedGLESv2Dispatch* instance = sGLESv2Dispatch();
    if (instance->mValid) {
        return &s_gles2;
    } else {
        return nullptr;
    }
}

LazyLoadedGLESv2Dispatch::LazyLoadedGLESv2Dispatch() {
    LazyLoadedEGLDispatch::get();
    mValid = gles2_dispatch_init(&s_gles2);
}

// static
const EGLDispatch* LazyLoadedEGLDispatch::get() {
    LazyLoadedEGLDispatch* instance = sEGLDispatch();
    if (instance->mValid) {
        return &s_egl;
    } else {
        return nullptr;
    }
}

LazyLoadedEGLDispatch::LazyLoadedEGLDispatch() { mValid = init_egl_dispatch(); }

}  // namespace gl
}  // namespace gfxstream