private void WriteVariableHeader(EndianWriter writer, VariableHeader header)
{
//name offset
writer.Write(header.NameOffset);
//startOffset
writer.Write(header.StartOffset);
//Size
writer.Write(header.Variable.Length);
//flags
writer.Write((uint)ShaderVariableFlags.Used); //Unity only packs used variables as far as I can tell
uint typeOffset = m_typeLookup[header.Variable.ShaderType];
//type offset
writer.Write(typeOffset);
//default value offset
writer.Write((uint)0); //Not used
if (majorVersion >= 5)
{
//StartTexture
writer.Write((uint)0);
//TextureSize
writer.Write((uint)0);
//StartSampler
writer.Write((uint)0);
//SamplerSize
writer.Write((uint)0);
}
}
private void BuildVariableHeaders(uint variableOffset)
{
const int memberSize = 12;
uint variableSize = majorVersion >= 5 ? (uint)40 : (uint)24;
uint variableCount = (uint)m_variables.Length;
uint dataOffset = variableOffset + variableCount * variableSize;
foreach (Variable variable in m_variables)
{
m_variableNameLookup[variable.Name] = dataOffset;
VariableHeader header = new VariableHeader();
header.NameOffset = dataOffset;
dataOffset += (uint)variable.Name.Length + 1;
header.StartOffset = (uint)variable.Index;
header.Variable = variable;
m_typeLookup[variable.ShaderType] = dataOffset;
dataOffset += variable.ShaderType.Size();
variable.ShaderType.MemberOffset = variable.ShaderType.Members.Length > 0 ? dataOffset : 0;
dataOffset += (uint)variable.ShaderType.Members.Length * memberSize;
foreach (ShaderTypeMember member in variable.ShaderType.Members)
{
m_variableNameLookup[member.Name] = dataOffset;
dataOffset += (uint)member.Name.Length + 1;
m_typeLookup[member.ShaderType] = dataOffset;
dataOffset += member.ShaderType.Size();
}
m_variableHeaders.Add(header);
}
Size = dataOffset - variableOffset;
}
public VariableChunk(ConstantBuffer constantBuffer, int constantBufferIndex, uint variableOffset, ShaderGpuProgramType programType)
{
const int memberSize = 12;
m_constantBufferIndex = constantBufferIndex;
m_programType = programType;
m_variables = BuildVariables(constantBuffer);
majorVersion = programType.GetMajorDXVersion();
uint variableSize = majorVersion >= 5 ? (uint)40 : (uint)24;
uint variableCount = (uint)m_variables.Count;
uint dataOffset = variableOffset + variableCount * variableSize;
foreach (Variable variable in m_variables)
{
m_variableNameLookup[variable.Name] = dataOffset;
VariableHeader header = new VariableHeader();
header.NameOffset = dataOffset;
dataOffset += (uint)variable.Name.Length + 1;
header.StartOffset = (uint)variable.Index;
header.Variable = variable;
m_typeLookup[variable.ShaderType] = dataOffset;
dataOffset += variable.ShaderType.Size();
variable.ShaderType.MemberOffset = variable.ShaderType.Members.Count > 0 ? dataOffset : 0;
dataOffset += (uint)variable.ShaderType.Members.Count * memberSize;
foreach (ShaderTypeMember member in variable.ShaderType.Members)
{
m_variableNameLookup[member.Name] = dataOffset;
dataOffset += (uint)member.Name.Length + 1;
m_typeLookup[member.ShaderType] = dataOffset;
dataOffset += member.ShaderType.Size();
}
m_variableHeaders.Add(header);
}
Size = dataOffset - variableOffset;
}