/*
 * Copyright (C) 2019 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 "TransformFeedbackData.h"

#include "GLcommon/GLEScontext.h"
#include "GLcommon/GLSnapshotSerializers.h"

TransformFeedbackData::TransformFeedbackData(android::base::Stream* stream)
    : ObjectData(stream) {
    if (stream) {
        loadContainer(stream, m_indexedTransformFeedbackBuffers);
    }
}

void TransformFeedbackData::setMaxSize(int maxSize) {
    m_indexedTransformFeedbackBuffers.resize(maxSize);
}

void TransformFeedbackData::onSave(android::base::Stream* stream,
                                   unsigned int globalName) const {
    ObjectData::onSave(stream, globalName);
    saveContainer(stream, m_indexedTransformFeedbackBuffers);
}

void TransformFeedbackData::restore(ObjectLocalName localName,
                                    const getGlobalName_t& getGlobalName) {
    ObjectData::restore(localName, getGlobalName);
    int globalName =
            getGlobalName(NamedObjectType::TRANSFORM_FEEDBACK, localName);
    GLDispatch& dispatcher = GLEScontext::dispatcher();
    dispatcher.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, globalName);
    for (unsigned int i = 0; i < m_indexedTransformFeedbackBuffers.size();
         i++) {
        auto& bufferBinding = m_indexedTransformFeedbackBuffers[i];
        if (!bufferBinding.buffer)
            continue;
        auto bufferName = getGlobalName(NamedObjectType::VERTEXBUFFER,
                                        bufferBinding.buffer);
        if (bufferBinding.isBindBase) {
            dispatcher.glBindBufferBase(GL_TRANSFORM_FEEDBACK, i, bufferName);
        } else {
            dispatcher.glBindBufferRange(GL_TRANSFORM_FEEDBACK, i, bufferName,
                                         bufferBinding.offset,
                                         bufferBinding.size);
        }
    }
}

void TransformFeedbackData::bindIndexedBuffer(GLuint index,
                                              GLuint buffer,
                                              GLintptr offset,
                                              GLsizeiptr size,
                                              GLintptr stride,
                                              bool isBindBase) {
    if (index >= m_indexedTransformFeedbackBuffers.size()) {
        return;
    }
    auto& bufferBinding = m_indexedTransformFeedbackBuffers[index];
    bufferBinding.buffer = buffer;
    bufferBinding.offset = offset;
    bufferBinding.size = size;
    bufferBinding.stride = stride;
    bufferBinding.isBindBase = isBindBase;
}

void TransformFeedbackData::unbindBuffer(GLuint buffer) {
    for (auto& bufferBinding : m_indexedTransformFeedbackBuffers) {
        if (bufferBinding.buffer == buffer) {
            bufferBinding = {};
        }
    }
}

GLuint TransformFeedbackData::getIndexedBuffer(GLuint index) {
    return m_indexedTransformFeedbackBuffers[index].buffer;
}