public unsafe void AddGeometryAabb(
VulkanScene scene,
uint aabbOffset,
uint aabbCount,
bool isOpaque)
{
var geometry = new AccelerationStructureGeometryKHR();
geometry.SType = StructureType.AccelerationStructureGeometryKhr;
geometry.PNext = null;
geometry.GeometryType = GeometryTypeKHR.GeometryTypeAabbsKhr;
geometry.Geometry.Aabbs.SType = StructureType.AccelerationStructureGeometryAabbsDataKhr;
geometry.Geometry.Aabbs.PNext = null;
geometry.Geometry.Aabbs.Data.DeviceAddress = scene.AabbBuffer.GetDeviceAddress();
geometry.Geometry.Aabbs.Stride = (ulong)sizeof(AabbPositionsKHR);
geometry.Flags = isOpaque ? GeometryFlagsKHR.GeometryOpaqueBitKhr : 0;
var buildOffsetInfo = new AccelerationStructureBuildRangeInfoKHR();
buildOffsetInfo.FirstVertex = 0;
buildOffsetInfo.PrimitiveOffset = aabbOffset;
buildOffsetInfo.PrimitiveCount = aabbCount;
buildOffsetInfo.TransformOffset = 0;
_geometry.Add(geometry);
_buildOffsetInfo.Add(buildOffsetInfo);
}
public unsafe void AddGeometryTriangles(
VulkanScene scene,
uint vertexOffset, uint vertexCount,
uint indexOffset, uint indexCount,
bool isOpaque)
{
var geometry = new AccelerationStructureGeometryKHR();
geometry.SType = StructureType.AccelerationStructureGeometryKhr;
geometry.PNext = null;
geometry.GeometryType = GeometryTypeKHR.GeometryTypeTrianglesKhr;
geometry.Geometry.Triangles.SType = StructureType.AccelerationStructureGeometryTrianglesDataKhr;
geometry.Geometry.Triangles.PNext = null;
geometry.Geometry.Triangles.VertexData.DeviceAddress = scene.VertexBuffer.GetDeviceAddress();
geometry.Geometry.Triangles.VertexStride = (ulong)sizeof(Vertex);
geometry.Geometry.Triangles.MaxVertex = vertexCount;
geometry.Geometry.Triangles.VertexFormat = Format.R32G32B32Sfloat;
geometry.Geometry.Triangles.IndexData.DeviceAddress = scene.IndexBuffer.GetDeviceAddress();
geometry.Geometry.Triangles.IndexType = IndexType.Uint32;
geometry.Geometry.Triangles.TransformData = default;
geometry.Flags = isOpaque ? GeometryFlagsKHR.GeometryOpaqueBitKhr : 0;
var buildOffsetInfo = new AccelerationStructureBuildRangeInfoKHR();
buildOffsetInfo.FirstVertex = vertexOffset / (uint)sizeof(Vertex);
buildOffsetInfo.PrimitiveOffset = indexOffset;
buildOffsetInfo.PrimitiveCount = indexCount / 3;
buildOffsetInfo.TransformOffset = 0;
_geometry.Add(geometry);
_buildOffsetInfo.Add(buildOffsetInfo);
}
