/*
* 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 "GrVkDescriptorPool.h"

#include "GrVkGpu.h"
#include "SkTemplates.h"


GrVkDescriptorPool::GrVkDescriptorPool(const GrVkGpu* gpu, VkDescriptorType type, uint32_t count)
    : INHERITED()
    , fType (type) 
    , fCount(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;

    GR_VK_CALL_ERRCHECK(gpu->vkInterface(), CreateDescriptorPool(gpu->device(),
                                                                 &createInfo,
                                                                 nullptr,
                                                                 &fDescPool));
}

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

void GrVkDescriptorPool::reset(const GrVkGpu* gpu) {
    GR_VK_CALL_ERRCHECK(gpu->vkInterface(), ResetDescriptorPool(gpu->device(), fDescPool, 0));
}

void GrVkDescriptorPool::freeGPUData(const 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));
}