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
var typeOffset = 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);
}
}
public VariableChunk(ConstantBuffer constantBuffer, int constantBufferIndex, uint variableOffset, ShaderGpuProgramType programType)
{
const int memberSize = 12;
this.constantBuffer = constantBuffer;
this.constantBufferIndex = constantBufferIndex;
this.programType = programType;
this.variables = BuildVariables(constantBuffer);
majorVersion = DXShaderObjectExporter.GetMajorVersion(programType);
uint variableSize = majorVersion >= 5 ? (uint)40 : (uint)24;
uint variableCount = (uint)variables.Count;
uint dataOffset = variableOffset + variableCount * variableSize;
foreach (var variable in variables)
{
variableNameLookup[variable.Name] = dataOffset;
var header = new VariableHeader();
header.nameOffset = dataOffset;
dataOffset += (uint)variable.Name.Length + 1;
header.startOffset = (uint)variable.Index;
header.variable = variable;
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 (var member in variable.ShaderType.members)
{
variableNameLookup[member.Name] = dataOffset;
dataOffset += (uint)member.Name.Length + 1;
typeLookup[member.ShaderType] = dataOffset;
dataOffset += member.ShaderType.Size();
}
variableHeaders.Add(header);
}
size = dataOffset - variableOffset;
}