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(Bufferable &&other):
  12         buffer(other.buffer),
  13         offset(other.offset),
  14         next_in_buffer(other.next_in_buffer),
  15         prev_in_buffer(other.prev_in_buffer),
  16         location_dirty(other.location_dirty),
  17         dirty(other.dirty)
  18 {
  19         other.buffer = 0;
  20         other.next_in_buffer = 0;
  21         other.prev_in_buffer = 0;
  22         if(next_in_buffer)
  23                 next_in_buffer->prev_in_buffer = this;
  24         if(prev_in_buffer)
  25                 prev_in_buffer->next_in_buffer = this;
  26 }
  27
  28 Bufferable::~Bufferable()
  29 {
  30         unlink_from_buffer();
  31 }
  32
  33 void Bufferable::use_buffer(Buffer *buf, Bufferable *prev)
  34 {
  35         if(prev && buf!=prev->buffer)
  36                 throw invalid_argument("Bufferable::use_buffer");
  37
  38         if(buffer)
  39                 unlink_from_buffer();
  40
  41         buffer = buf;
  42         if(buffer)
  43         {
  44                 prev_in_buffer = prev;
  45                 if(prev_in_buffer)
  46                 {
  47                         next_in_buffer = prev_in_buffer->next_in_buffer;
  48                         prev_in_buffer->next_in_buffer = this;
  49                 }
  50         }
  51
  52         location_dirty = true;
  53         mark_dirty();
  54         update_offset();
  55 }
  56
  57 void Bufferable::change_buffer(Buffer *buf)
  58 {
  59         for(Bufferable *b=this; b; b=b->next_in_buffer)
  60         {
  61                 b->buffer = buf;
  62                 b->location_dirty = true;
  63                 b->mark_dirty();
  64         }
  65         for(Bufferable *b=prev_in_buffer; b; b=b->prev_in_buffer)
  66         {
  67                 b->buffer = buf;
  68                 b->location_dirty = true;
  69                 b->mark_dirty();
  70         }
  71 }
  72
  73 size_t Bufferable::get_required_buffer_size(bool align) const
  74 {
  75         const Bufferable *last = this;
  76         for(; last->next_in_buffer; last=last->next_in_buffer) ;
  77         size_t size = last->offset+last->get_data_size();
  78         if(align)
  79         {
  80                 const Bufferable *first = this;
  81                 for(; first->prev_in_buffer; first=first->prev_in_buffer) ;
  82                 size_t alignment = first->get_alignment();
  83                 size += alignment-1;
  84                 size -= size%alignment;
  85         }
  86         return size;
  87 }
  88
  89 void Bufferable::unlink_from_buffer()
  90 {
  91         if(prev_in_buffer)
  92                 prev_in_buffer->next_in_buffer = next_in_buffer;
  93         if(next_in_buffer)
  94         {
  95                 next_in_buffer->prev_in_buffer = prev_in_buffer;
  96                 next_in_buffer->update_offset();
  97         }
  98         prev_in_buffer = 0;
  99         next_in_buffer = 0;
 100         buffer = 0;
 101         offset = 0;
 102 }
 103
 104 void Bufferable::update_offset()
 105 {
 106         size_t new_offset = 0;
 107         if(prev_in_buffer)
 108                 new_offset = prev_in_buffer->offset+prev_in_buffer->get_data_size();
 109
 110         size_t align = get_alignment();
 111         new_offset += align-1;
 112         new_offset -= new_offset%align;
 113         if(new_offset!=offset)
 114         {
 115                 offset = new_offset;
 116                 location_dirty = true;
 117                 mark_dirty();
 118         }
 119
 120         if(next_in_buffer)
 121                 next_in_buffer->update_offset();
 122         else if(buffer && offset+get_data_size()>buffer->get_size())
 123         {
 124                 location_dirty = true;
 125                 mark_dirty();
 126         }
 127 }
 128
 129 void Bufferable::mark_dirty()
 130 {
 131         dirty = true;
 132 }
 133
 134 void Bufferable::upload_data(char *target) const
 135 {
 136         if(!buffer)
 137                 throw invalid_operation("Bufferable::upload_data");
 138
 139         size_t data_size = get_data_size();
 140         if(location_dirty)
 141         {
 142                 buffer->require_size(offset+data_size);
 143                 location_dirty = false;
 144         }
 145
 146         if(target)
 147         {
 148                 const char *source = reinterpret_cast<const char *>(get_data_pointer());
 149                 copy(source, source+data_size, target);
 150         }
 151         else
 152                 buffer->sub_data(offset, data_size, get_data_pointer());
 153         dirty = false;
 154 }
 155
 156
 157 Bufferable::AsyncUpdater::AsyncUpdater(const Bufferable &b):
 158         bufferable(b)
 159 {
 160         bufferable.buffer->require_size(bufferable.get_required_buffer_size());
 161         mapped_address = reinterpret_cast<char *>(bufferable.buffer->map());
 162 }
 163
 164 Bufferable::AsyncUpdater::~AsyncUpdater()
 165 {
 166         bufferable.buffer->unmap();
 167 }
 168
 169 void Bufferable::AsyncUpdater::upload_data()
 170 {
 171         bufferable.upload_data(mapped_address+bufferable.offset);
 172         // Update all bufferables in the same buffer at once
 173         for(const Bufferable *b=bufferable.prev_in_buffer; b; b=b->prev_in_buffer)
 174                 if(b->dirty)
 175                         b->upload_data(mapped_address+b->offset);
 176         for(const Bufferable *b=bufferable.next_in_buffer; b; b=b->next_in_buffer)
 177                 if(b->dirty)
 178                         b->upload_data(mapped_address+b->offset);
 179 }
 180
 181 } // namespace GL
 182 } // namespace Msp