/*
 * MIT License
 *
 * Copyright (c) 2020 Azercoco & Technici4n
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package aztech.modern_industrialization.client.thirdparty.fabricrendering;
/*
 * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
 * 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.
 */

import java.util.function.Consumer;

/**
 * Implementation of {@link Mesh}. The way we encode meshes makes it very simple.
 */
public class MeshImpl implements Mesh {
    /** Used to satisfy external calls to {@link #forEach(Consumer)}. */
    ThreadLocal<QuadViewImpl> POOL = ThreadLocal.withInitial(QuadViewImpl::new);

    final int[] data;

    MeshImpl(int[] data) {
        this.data = data;
    }

    public int[] data() {
        return data;
    }

    @Override
    public void forEach(Consumer<QuadView> consumer) {
        forEach(consumer, POOL.get());
    }

    /**
     * The renderer will call this with it's own cursor to avoid the performance hit of a thread-local lookup. Also
     * means renderer can hold final references to quad buffers.
     */
    void forEach(Consumer<QuadView> consumer, QuadViewImpl cursor) {
        final int limit = data.length;
        int index = 0;

        while (index < limit) {
            cursor.load(data, index);
            consumer.accept(cursor);
            index += EncodingFormat.TOTAL_STRIDE;
        }
    }

    @Override
    public void outputTo(QuadEmitter emitter) {
        MutableQuadViewImpl e = (MutableQuadViewImpl) emitter;
        final int[] data = this.data;
        final int limit = data.length;
        int index = 0;

        while (index < limit) {
            System.arraycopy(data, index, e.data, e.baseIndex, EncodingFormat.TOTAL_STRIDE);
            e.load();
            e.emitDirectly();
            index += EncodingFormat.TOTAL_STRIDE;
        }

        e.clear();
    }
}
