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#pragma once
#include "VkEngine.h"
namespace vke {
struct BindingSlot {
uint layoutIdx;
uint descriptorIdx;
Resource* pResource;
};
//should be thread safe with dedicate desc and cmd pools
class ShadingContext
{
vke::VulkanDevice* device;
VkDescriptorPool descriptorPool;
VkCommandPool cmdPool;//?
std::vector<std::vector<VkDescriptorSetLayoutBinding>> descriptorSetLayoutBindings;
uint32_t maxSets;
public:
std::vector<VkDescriptorSetLayout> layouts;
ShadingContext(vke::VulkanDevice* _device, uint32_t maxDescriptorSet = 1) {
device = _device;
maxSets = maxDescriptorSet;
}
virtual ~ShadingContext() {
for(uint i=0; i<layouts.size(); i++)
vkDestroyDescriptorSetLayout(device->dev, layouts[i], VK_NULL_HANDLE);
vkDestroyDescriptorPool(device->dev, descriptorPool, VK_NULL_HANDLE);
}
uint32_t addDescriptorSetLayout (const std::vector<VkDescriptorSetLayoutBinding>& descriptorSetLayoutBinding) {
uint32_t idx = descriptorSetLayoutBindings.size();
descriptorSetLayoutBindings.push_back (descriptorSetLayoutBinding);
return idx;
}
void prepare () {
uint32_t descTypeCount[VK_DESCRIPTOR_TYPE_END_RANGE+1] = {};
//count descriptor types to init desc pool
for(uint i=0; i<descriptorSetLayoutBindings.size(); i++)
for(uint j=0; j<descriptorSetLayoutBindings[i].size(); j++)
descTypeCount[descriptorSetLayoutBindings[i][j].descriptorType] += descriptorSetLayoutBindings[i][j].descriptorCount;
std::vector<VkDescriptorPoolSize> poolSizes;
for(int i=VK_DESCRIPTOR_TYPE_BEGIN_RANGE; i<VK_DESCRIPTOR_TYPE_END_RANGE; i++) {
if (descTypeCount[i]>0)
poolSizes.push_back ({(VkDescriptorType)i, descTypeCount[i]});
}
VkDescriptorPoolCreateInfo poolInfo= {VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO};
poolInfo.poolSizeCount = (uint32_t)poolSizes.size();
poolInfo.pPoolSizes = poolSizes.data();
poolInfo.maxSets = maxSets;
VK_CHECK_RESULT(vkCreateDescriptorPool(device->dev, &poolInfo, nullptr, &descriptorPool));
layouts.resize(descriptorSetLayoutBindings.size());
for(uint i=0; i<descriptorSetLayoutBindings.size(); i++) {
VkDescriptorSetLayoutCreateInfo layoutInfos = {VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO};
layoutInfos.bindingCount= (uint32_t)descriptorSetLayoutBindings[i].size();
layoutInfos.pBindings = descriptorSetLayoutBindings[i].data();
VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device->dev, &layoutInfos, nullptr, &layouts[i]));
}
}
VkDescriptorSet allocateDescriptorSet (uint32_t layoutIndex) {
VkDescriptorSet ds = VK_NULL_HANDLE;
VkDescriptorSetAllocateInfo dsInfo = {VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO};
dsInfo.descriptorPool = descriptorPool;
dsInfo.pSetLayouts = &layouts[layoutIndex];
dsInfo.descriptorSetCount = 1;
VK_CHECK_RESULT(vkAllocateDescriptorSets(device->dev, &dsInfo, &ds));
return ds;
}
void updateDescriptorSet (VkDescriptorSet ds, const std::vector<BindingSlot>& slots) {
std::vector<VkWriteDescriptorSet> writeDescriptorSets;
for (uint i=0; i<slots.size(); i++) {
VkDescriptorSetLayoutBinding dslb = descriptorSetLayoutBindings[slots[i].layoutIdx][slots[i].descriptorIdx];
writeDescriptorSets.push_back (
slots[i].pResource->getWriteDescriptorSet (ds, dslb.binding, dslb.descriptorType));
}
vkUpdateDescriptorSets(device->dev,(uint32_t) writeDescriptorSets.size(), writeDescriptorSets.data(), 0, NULL);
}
};
}
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