source/core/bufferable.cpp

   1 #include <stdexcept>
   2 #include "buffer.h"
   3 #include "bufferable.h"
   4 #include "error.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 Bufferable::~Bufferable()
  12 {
  13         unlink_from_buffer();
  14 }
  15
  16 void Bufferable::use_buffer(Buffer *buf, Bufferable *prev)
  17 {
  18         if(prev && buf!=prev->buffer)
  19                 throw invalid_argument("Bufferable::use_buffer");
  20
  21         if(buffer)
  22                 unlink_from_buffer();
  23
  24         buffer = buf;
  25         if(buffer)
  26         {
  27                 prev_in_buffer = prev;
  28                 if(prev_in_buffer)
  29                 {
  30                         next_in_buffer = prev_in_buffer->next_in_buffer;
  31                         prev_in_buffer->next_in_buffer = this;
  32                 }
  33         }
  34
  35         location_dirty = true;
  36         dirty = true;
  37         update_offset();
  38 }
  39
  40 void Bufferable::change_buffer(Buffer *buf)
  41 {
  42         for(Bufferable *b=this; b; b=b->next_in_buffer)
  43         {
  44                 b->buffer = buf;
  45                 b->location_dirty = true;
  46                 b->dirty = true;
  47         }
  48         for(Bufferable *b=prev_in_buffer; b; b=b->prev_in_buffer)
  49         {
  50                 b->buffer = buf;
  51                 b->location_dirty = true;
  52                 b->dirty = true;
  53         }
  54 }
  55
  56 size_t Bufferable::get_required_buffer_size() const
  57 {
  58         const Bufferable *last = this;
  59         for(; last->next_in_buffer; last=last->next_in_buffer) ;
  60         return last->offset+last->get_data_size();
  61 }
  62
  63 void Bufferable::unlink_from_buffer()
  64 {
  65         if(prev_in_buffer)
  66                 prev_in_buffer->next_in_buffer = next_in_buffer;
  67         if(next_in_buffer)
  68         {
  69                 next_in_buffer->prev_in_buffer = prev_in_buffer;
  70                 next_in_buffer->update_offset();
  71         }
  72         prev_in_buffer = 0;
  73         next_in_buffer = 0;
  74         buffer = 0;
  75         offset = 0;
  76 }
  77
  78 void Bufferable::update_offset()
  79 {
  80         size_t new_offset = 0;
  81         if(prev_in_buffer)
  82                 new_offset = prev_in_buffer->offset+prev_in_buffer->get_data_size();
  83
  84         size_t align = get_alignment();
  85         new_offset += align-1;
  86         new_offset -= new_offset%align;
  87         if(new_offset!=offset)
  88         {
  89                 offset = new_offset;
  90                 location_dirty = true;
  91                 dirty = true;
  92         }
  93
  94         if(next_in_buffer)
  95                 next_in_buffer->update_offset();
  96         else if(buffer && offset+get_data_size()>buffer->get_size())
  97         {
  98                 location_dirty = true;
  99                 dirty = true;
 100         }
 101 }
 102
 103 void Bufferable::upload_data(char *target) const
 104 {
 105         if(!buffer)
 106                 throw invalid_operation("Bufferable::upload_data");
 107
 108         size_t data_size = get_data_size();
 109         if(location_dirty)
 110         {
 111                 buffer->require_size(offset+data_size);
 112                 location_dirty = false;
 113         }
 114
 115         if(target)
 116         {
 117                 const char *source = reinterpret_cast<const char *>(get_data_pointer());
 118                 copy(source, source+data_size, target);
 119         }
 120         else
 121                 buffer->sub_data(offset, data_size, get_data_pointer());
 122         dirty = false;
 123 }
 124
 125
 126 Bufferable::AsyncUpdater::AsyncUpdater(const Bufferable &b):
 127         bufferable(b)
 128 {
 129         bufferable.buffer->require_size(bufferable.get_required_buffer_size());
 130         mapped_address = reinterpret_cast<char *>(bufferable.buffer->map());
 131 }
 132
 133 Bufferable::AsyncUpdater::~AsyncUpdater()
 134 {
 135         bufferable.buffer->unmap();
 136 }
 137
 138 void Bufferable::AsyncUpdater::upload_data()
 139 {
 140         bufferable.upload_data(mapped_address+bufferable.offset);
 141         // Update all bufferables in the same buffer at once
 142         for(const Bufferable *b=bufferable.prev_in_buffer; b; b=b->prev_in_buffer)
 143                 if(b->dirty)
 144                         b->upload_data(mapped_address+b->offset);
 145         for(const Bufferable *b=bufferable.next_in_buffer; b; b=b->next_in_buffer)
 146                 if(b->dirty)
 147                         b->upload_data(mapped_address+b->offset);
 148 }
 149
 150 } // namespace GL
 151 } // namespace Msp