/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/

#include "src/gpu/vk/GrVkDescriptorPool.h"

#include "include/private/SkTemplates.h"
#include "src/gpu/vk/GrVkGpu.h"


GrVkDescriptorPool* GrVkDescriptorPool::Create(GrVkGpu* gpu, VkDescriptorType type,
                                               uint32_t count) {
    VkDescriptorPoolSize poolSize;
    memset(&poolSize, 0, sizeof(VkDescriptorPoolSize));
    poolSize.descriptorCount = count;
    poolSize.type = type;

    VkDescriptorPoolCreateInfo createInfo;
    memset(&createInfo, 0, sizeof(VkDescriptorPoolCreateInfo));
    createInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
    createInfo.pNext = nullptr;
    createInfo.flags = 0;
    // This is an over/conservative estimate since each set may contain more than count descriptors.
    createInfo.maxSets = count;
    createInfo.poolSizeCount = 1;
    createInfo.pPoolSizes = &poolSize;

    VkDescriptorPool pool;
    VkResult result;
    GR_VK_CALL_RESULT(gpu, result, CreateDescriptorPool(gpu->device(), &createInfo, nullptr,
                                                        &pool));
    if (result != VK_SUCCESS) {
        return nullptr;
    }
    return new GrVkDescriptorPool(pool, type, count);
}

GrVkDescriptorPool::GrVkDescriptorPool(VkDescriptorPool pool, VkDescriptorType type, uint32_t count)
        : INHERITED(), fType(type), fCount(count), fDescPool(pool) {}

bool GrVkDescriptorPool::isCompatible(VkDescriptorType type, uint32_t count) const {
    return fType == type && count <= fCount;
}

void GrVkDescriptorPool::freeGPUData(GrVkGpu* gpu) const {
    // Destroying the VkDescriptorPool will automatically free and delete any VkDescriptorSets
    // allocated from the pool.
    GR_VK_CALL(gpu->vkInterface(), DestroyDescriptorPool(gpu->device(), fDescPool, nullptr));
}
