source/backends/vulkan/structurebuilder.cpp

   1 #include "error.h"
   2 #include "structurebuilder.h"
   3
   4 using namespace std;
   5
   6 namespace Msp {
   7 namespace GL {
   8
   9 StructureBuilder::StructureBuilder(vector<char> &s, unsigned max_parts):
  10         storage(s)
  11 {
  12         storage.clear();
  13         parts.reserve(max_parts);
  14 }
  15
  16 void *&StructureBuilder::add(std::size_t size, std::size_t align)
  17 {
  18         if(parts.size()>=parts.capacity())
  19                 throw invalid_operation("StructureBuilder::add");
  20
  21         parts.emplace_back();
  22         Part &part = parts.back();
  23         part.offset = storage.size()+align-1;
  24         part.offset -= part.offset%align;
  25
  26         storage.resize(part.offset+size);
  27         for(Part &p: parts)
  28                 p.pointer = storage.data()+p.offset;
  29
  30         return parts.back().pointer;
  31 }
  32
  33 } // namespace GL
  34 } // namespace Msp