[Vulkan] BufferDeviceAddress를 사용하여 데이터 접근을 쉽게 하기를 원합니다.

GLSL 준비

#version 460
#extension GL_EXT_ray_tracing : enable
#extension GL_EXT_scalar_block_layout : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int64 : require
#extension GL_EXT_buffer_reference2 : require

struct MeshAddress
{
    uint64_t vertices;
    uint64_t indices;
};

struct Vertex
{
    vec3 pos;
};

layout(buffer_reference, scalar) buffer Vertices { Vertex v[]; };
layout(buffer_reference, scalar) buffer Indices { uvec3 i[]; };
layout(binding = 3) buffer Addresses { MeshAddress address[]; } addresses;

볼칸 준비.

vk::PhysicalDeviceFeatures deviceFeatures;
deviceFeatures.shaderInt64 = true;

vk::PhysicalDeviceBufferDeviceAddressFeatures addressFeatures;
addressFeatures.bufferDeviceAddress = true;

struct BufferAddress
{
    vk::DeviceAddress vertices;
    vk::DeviceAddress indices;
};

std::vector<BufferAddress> addresses;
for(auto&& mesh: meshes){
  BufferAddress address;
  address.vertices = mesh.vertexBuffer.deviceAddress;
  address.indices = mesh.indexBuffer.deviceAddress;
  addresses.push_back(address);
}

Buffer addressBuffer{
  sizeof(BufferAddress) * addresses.size(), 
  vk::BufferUsageFlagBits::eStorageBuffer |
  vk::BufferUsageFlagBits::eShaderDeviceAddress };

descSet.update("Addresses", addressBuffer);

GLSL에서 사용

MeshAddress address = addresses.address[gl_InstanceID];
Vertices vertices = Vertices(address.vertices);
Indices indices = Indices(address.indices);

uvec3 index = indices.i[gl_PrimitiveID];
Vertex v0 = vertices.v[index.x];
Vertex v1 = vertices.v[index.y];
Vertex v2 = vertices.v[index.z];