public void SetPerVertexData <T>(T[] data, params VertexAttrib[] vertexAttribs) where T : struct
{
GL.BindVertexArray(_vao);
GL.BindBuffer(BufferTarget.ArrayBuffer, _vbo1);
GL.BufferData(BufferTarget.ArrayBuffer, Unsafe.SizeOf <T>() * data.Length, data, BufferUsageHint.StaticDraw);
//calculate stride
int stride = 0;
foreach (VertexAttrib attrib in vertexAttribs)
{
stride += GetPointerTypeSize(attrib.PointerType) * attrib.Size;
}
int offset = 0;
for (int i = 0; i < vertexAttribs.Length; i++)
{
VertexAttrib attrib = vertexAttribs[i];
GL.VertexAttribPointer(i + 1, attrib.Size, attrib.PointerType, attrib.Normalized, stride, offset);
GL.EnableVertexAttribArray(i + 1);
offset += GetPointerTypeSize(attrib.PointerType) * attrib.Size;
}
GL.BindVertexArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.ObjectLabel(ObjectLabelIdentifier.Buffer, _vbo1, Name.Length + 5, Name + "-VBO1");
_vertexAttribs = vertexAttribs;
}
public void SetPerVertexData <T>(T[] data) where T : struct
{
//vertex attribs
FieldInfo[] fields = typeof(T).GetFields();
VertexAttrib[] vertexAttribs = new VertexAttrib[fields.Length];
for (int i = 0; i < fields.Length; i++)
{
var attribs = fields[i].GetCustomAttributes(typeof(VertexAttribAttribute));
VertexAttribAttribute attrib = attribs.Count() > 0 ? (VertexAttribAttribute)attribs.First() : throw new ArgumentNullException();
vertexAttribs[i] = new VertexAttrib(attrib.PointerType, attrib.Size, attrib.Normalized);
}
SetPerVertexData(data, vertexAttribs);
}
public override GameAsset ReadFromStream(BinaryReader reader)
{
string name = reader.ReadString();
//vertex buffer
int verticesCount = reader.ReadInt32();
int vertexBufferSize = Vector3.SizeInBytes * verticesCount;
byte[] vertexBytesBuffer = reader.ReadBytes(vertexBufferSize);
Vector3[] vertices = Helper.ByteArrayToStructArray <Vector3>(vertexBytesBuffer);
//index buffer
int indicesCount = reader.ReadInt32();
int indexBufferSize = sizeof(uint) * indicesCount;
byte[] indexBytesBuffer = reader.ReadBytes(indexBufferSize);
uint[] indices = Helper.ByteArrayToStructArray <uint>(indexBytesBuffer);
//per vertex buffer
int perVertexBufferSize = reader.ReadInt32();
byte[] perVertexBytesBuffer = reader.ReadBytes(perVertexBufferSize);
//vertex attribs
int attribsCount = reader.ReadInt32();
VertexAttrib[] attribs = new VertexAttrib[attribsCount];
for (int i = 0; i < attribsCount; i++)
{
VertexAttribPointerType pointerType = (VertexAttribPointerType)reader.ReadInt32();
int size = reader.ReadInt32();
bool normalized = reader.ReadBoolean();
attribs[i] = new VertexAttrib(pointerType, size, normalized);
}
//init mesh
Mesh mesh = new Mesh(name);
mesh.LoadMesh(vertices, indices);
mesh.SetPerVertexData(perVertexBytesBuffer, attribs);
return(mesh);
}
public override void WriteToStream(BinaryWriter writer, GameAsset asset)
{
Mesh mesh = (Mesh)asset;
//get arrays
Vector3[] vertices = mesh.Vertices.ToArray();
uint[] indices = mesh.Indices.ToArray();
//get per vertex data
GL.BindBuffer(BufferTarget.ArrayBuffer, mesh.VBO1);
GL.GetBufferParameter(BufferTarget.ArrayBuffer, BufferParameterName.BufferSize, out int perVertexBufferSize);
byte[] perVertexBuffer = new byte[perVertexBufferSize];
GL.GetBufferSubData(BufferTarget.ArrayBuffer, IntPtr.Zero, perVertexBufferSize, perVertexBuffer);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
//write to stream
writer.Write(mesh.Name); //name
writer.Write(vertices.Length); //vertices count
byte[] vertexBytesBuffer = Helper.StructArrayToByteArray(vertices);
writer.Write(vertexBytesBuffer); //vertices
writer.Write(indices.Length); //indices count
byte[] indexBytesBuffer = Helper.StructArrayToByteArray(indices);
writer.Write(indexBytesBuffer); //indices
writer.Write(perVertexBufferSize); //per vertex buffer size
writer.Write(perVertexBuffer); //per vertex buffer
//vertex attribs
VertexAttrib[] attribs = mesh.VertexAttribs.ToArray();
writer.Write(attribs.Length); //attribs count
for (int i = 0; i < attribs.Length; i++)
{
VertexAttrib attrib = attribs[i];
writer.Write((int)attrib.PointerType); //pointer type
writer.Write(attrib.Size); //size
writer.Write(attrib.Normalized); //normalized
}
}
