descriptor set stuff from old engine

engine/src/descriptors/descriptor_writer.cpp

@@ -0,0 +1,72 @@
+#include "descriptor_writer.hpp"
+
+#include <cassert>
+#include <stdexcept>
+
+namespace sophia {
+
+DescriptorWriter::DescriptorWriter(DescriptorSetLayout& setLayout,
+                                   DescriptorPool& pool)
+    : setLayout{setLayout}, pool{pool} {}
+
+DescriptorWriter& DescriptorWriter::writeBuffer(
+    u32 binding, vk::DescriptorBufferInfo* bufferInfo) {
+  assert(this->setLayout.bindings.count(binding) == 1 &&
+         "setLayout does not contain specified binding");
+
+  auto& bindingDescription = this->setLayout.bindings[binding];
+
+  assert(bindingDescription.descriptorCount == 1 &&
+         "binding single descriptor info, but binding expects multiple");
+
+  vk::WriteDescriptorSet write{};
+  write.descriptorType = bindingDescription.descriptorType;
+  write.dstBinding = binding;
+  write.pBufferInfo = bufferInfo;
+  write.descriptorCount = 1;
+
+  writes.push_back(write);
+  return *this;
+}
+
+DescriptorWriter& DescriptorWriter::writeImage(
+    u32 binding, vk::DescriptorImageInfo* imageInfo) {
+  assert(this->setLayout.bindings.count(binding) == 1 &&
+         "setLayout does not contain specified binding");
+
+  auto& bindingDescription = this->setLayout.bindings[binding];
+
+  assert(bindingDescription.descriptorCount == 1 &&
+         "binding single descriptor info, but binding expects multiple");
+
+  vk::WriteDescriptorSet write{};
+  write.descriptorType = bindingDescription.descriptorType;
+  write.dstBinding = binding;
+  write.pImageInfo = imageInfo;
+  write.descriptorCount = 1;
+
+  writes.push_back(write);
+  return *this;
+}
+
+bool DescriptorWriter::build(vk::DescriptorSet& set) {
+  bool success =
+      this->pool.allocateDescriptorSet(setLayout.getDescriptorSetLayout(), set);
+
+  if (!success) {
+    return false;
+  }
+  overwrite(set);
+  return true;
+}
+
+void DescriptorWriter::overwrite(vk::DescriptorSet& set) {
+  for (auto& write : writes) {
+    write.dstSet = set;
+  }
+
+  this->pool.device.get()->updateDescriptorSets(writes.size(), writes.data(), 0,
+                                                nullptr);
+}
+
+}  // namespace sophia