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annotate semicongine/vulkan/descriptor.nim @ 981:c81541f55d9c

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add: check for uniform buffer layout, seem not be available on some older devices
author sam <sam@basx.dev>
date Sat, 06 Apr 2024 16:41:26 +0700
parents c104dbf5bbb8
children a4aa9f374d44
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1 import std/enumerate
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2 import std/tables
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3
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4 import ../core
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5 import ./device
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6 import ./buffer
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7 import ./image
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8
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9 type
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10 DescriptorType* = enum
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11 Uniform, ImageSampler
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12 Descriptor* = object # "fields" of a DescriptorSetLayout
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13 name*: string
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14 count*: uint32
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15 stages*: seq[VkShaderStageFlagBits]
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16 case thetype*: DescriptorType
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17 of Uniform:
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18 buffer*: Buffer
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19 offset*: uint64
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20 size*: uint64
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21 of ImageSampler:
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22 imageviews*: seq[ImageView]
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23 samplers*: seq[VulkanSampler]
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24 DescriptorSet* = object # "instance" of a DescriptorSetLayout
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25 vk*: VkDescriptorSet
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26 layout*: DescriptorSetLayout
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27 DescriptorSetLayout* = object # "type-description" of a DescriptorSet
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28 device: Device
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29 vk*: VkDescriptorSetLayout
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30 descriptors*: seq[Descriptor]
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31 DescriptorPool* = object # required for allocation of DescriptorSet
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32 device: Device
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33 vk*: VkDescriptorPool
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34 maxSets*: int # maximum number of allocatable descriptor sets
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35 counts*: seq[(VkDescriptorType, uint32)] # maximum number for each descriptor type to allocate
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36
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37 const DESCRIPTOR_TYPE_MAP = {
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38 Uniform: VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
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39 ImageSampler: VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
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40 }.toTable
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41
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42 func vkType(descriptor: Descriptor): VkDescriptorType =
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43 DESCRIPTOR_TYPE_MAP[descriptor.thetype]
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44
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45 proc createDescriptorSetLayout*(device: Device, descriptors: seq[Descriptor]): DescriptorSetLayout =
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46 assert device.vk.valid
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47
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48 result.device = device
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49 result.descriptors = descriptors
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50
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51 var layoutbindings: seq[VkDescriptorSetLayoutBinding]
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52 for i, descriptor in enumerate(descriptors):
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53 layoutbindings.add VkDescriptorSetLayoutBinding(
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54 binding: uint32(i),
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55 descriptorType: descriptor.vkType,
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56 descriptorCount: descriptor.count,
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57 stageFlags: toBits descriptor.stages,
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58 pImmutableSamplers: nil,
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59 )
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60 var layoutCreateInfo = VkDescriptorSetLayoutCreateInfo(
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61 sType: VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
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62 bindingCount: uint32(layoutbindings.len),
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63 pBindings: layoutbindings.toCPointer
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64 )
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65 checkVkResult vkCreateDescriptorSetLayout(device.vk, addr(layoutCreateInfo), nil, addr(result.vk))
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66
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67 proc destroy*(descriptorSetLayout: var DescriptorSetLayout) =
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68 assert descriptorSetLayout.device.vk.valid
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69 assert descriptorSetLayout.vk.valid
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70 descriptorSetLayout.device.vk.vkDestroyDescriptorSetLayout(descriptorSetLayout.vk, nil)
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71 descriptorSetLayout.vk.reset
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72
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73 proc createDescriptorSetPool*(device: Device, counts: seq[(VkDescriptorType, uint32)], maxSets = 1000): DescriptorPool =
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74 assert device.vk.valid
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75
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76 result.device = device
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77 result.maxSets = maxSets
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78 result.counts = counts
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79
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80 var poolSizes: seq[VkDescriptorPoolSize]
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81 for (thetype, count) in result.counts:
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82 poolSizes.add VkDescriptorPoolSize(thetype: thetype, descriptorCount: count)
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83 var poolInfo = VkDescriptorPoolCreateInfo(
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84 sType: VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
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85 poolSizeCount: uint32(poolSizes.len),
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86 pPoolSizes: poolSizes.toCPointer,
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87 maxSets: uint32(result.maxSets),
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88 )
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89 checkVkResult vkCreateDescriptorPool(result.device.vk, addr(poolInfo), nil, addr(result.vk))
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90
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91 proc reset*(pool: DescriptorPool) =
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92 assert pool.device.vk.valid
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93 assert pool.vk.valid
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94 checkVkResult vkResetDescriptorPool(pool.device.vk, pool.vk, VkDescriptorPoolResetFlags(0))
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95
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96 proc destroy*(pool: var DescriptorPool) =
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97 assert pool.device.vk.valid
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98 assert pool.vk.valid
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99 pool.device.vk.vkDestroyDescriptorPool(pool.vk, nil)
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100 pool.vk.reset
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101
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102 proc allocateDescriptorSet*(pool: DescriptorPool, layout: DescriptorSetLayout, nframes: int): seq[DescriptorSet] =
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103 assert pool.device.vk.valid
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104 assert pool.vk.valid
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105 assert layout.device.vk.valid
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106 assert layout.vk.valid
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107
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108 var layouts: seq[VkDescriptorSetLayout]
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109 var descriptorSets = newSeq[VkDescriptorSet](nframes)
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110 for i in 0 ..< nframes:
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111 layouts.add layout.vk
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112 var allocInfo = VkDescriptorSetAllocateInfo(
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113 sType: VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
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114 descriptorPool: pool.vk,
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115 descriptorSetCount: uint32(layouts.len),
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116 pSetLayouts: layouts.toCPointer,
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117 )
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118
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119 checkVkResult vkAllocateDescriptorSets(pool.device.vk, addr(allocInfo), descriptorSets.toCPointer)
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120 for descriptorSet in descriptorSets:
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121 result.add DescriptorSet(vk: descriptorSet, layout: layout)
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122
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123 proc writeDescriptorSet*(descriptorSet: DescriptorSet, bindingBase = 0'u32) =
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124 # assumes descriptors of the descriptorSet are arranged interleaved in buffer
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125 assert descriptorSet.layout.device.vk.valid
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126 assert descriptorSet.layout.vk.valid
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127 assert descriptorSet.vk.valid
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128
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129 var descriptorSetWrites: seq[VkWriteDescriptorSet]
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130 var bufferInfos: seq[VkDescriptorBufferInfo]
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131
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132 var i = bindingBase
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133 # need to keep this sequence out of the loop, otherwise it will be
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134 # gc-ed before the final update call and pointers are invalid :(
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135 var imgInfos: seq[seq[VkDescriptorImageInfo]]
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136 for descriptor in descriptorSet.layout.descriptors:
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137 if descriptor.thetype == Uniform:
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138 assert descriptor.buffer.vk.valid
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139 bufferInfos.add VkDescriptorBufferInfo(
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140 buffer: descriptor.buffer.vk,
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141 offset: descriptor.offset,
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142 range: descriptor.size,
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143 )
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144 descriptorSetWrites.add VkWriteDescriptorSet(
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145 sType: VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
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146 dstSet: descriptorSet.vk,
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147 dstBinding: i,
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148 dstArrayElement: 0,
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149 descriptorType: descriptor.vkType,
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150 descriptorCount: uint32(descriptor.count),
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151 pBufferInfo: addr bufferInfos[^1],
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152 )
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153 elif descriptor.thetype == ImageSampler:
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154 var imgInfo: seq[VkDescriptorImageInfo]
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155 for img_i in 0 ..< descriptor.count:
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156 assert descriptor.imageviews[img_i].vk.valid
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157 assert descriptor.samplers[img_i].vk.valid
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158 imgInfo.add VkDescriptorImageInfo(
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159 imageLayout: VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,
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160 imageView: descriptor.imageviews[img_i].vk,
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161 sampler: descriptor.samplers[img_i].vk,
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162 )
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163 imgInfos.add imgInfo
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164 descriptorSetWrites.add VkWriteDescriptorSet(
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165 sType: VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
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166 dstSet: descriptorSet.vk,
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167 dstBinding: i,
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168 dstArrayElement: 0,
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169 descriptorType: descriptor.vkType,
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170 descriptorCount: uint32(descriptor.count),
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171 pImageInfo: imgInfos[^1].toCPointer,
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172 )
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173 inc i
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174 descriptorSet.layout.device.vk.vkUpdateDescriptorSets(uint32(descriptorSetWrites.len), descriptorSetWrites.toCPointer, 0, nil)