source/bufferable.cpp

   1 #include <stdexcept>
   2 #include <msp/core/raii.h>
   3 #include <msp/gl/extensions/arb_direct_state_access.h>
   4 #include "bindable.h"
   5 #include "buffer.h"
   6 #include "bufferable.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 Bufferable::Bufferable():
  14         buffer(0),
  15         offset(0),
  16         next_in_buffer(0),
  17         prev_in_buffer(0),
  18         location_dirty(false),
  19         dirty(false)
  20 { }
  21
  22 Bufferable::~Bufferable()
  23 {
  24         unlink_from_buffer();
  25 }
  26
  27 void Bufferable::use_buffer(Buffer *buf, Bufferable *prev)
  28 {
  29         if(prev && buf!=prev->buffer)
  30                 throw invalid_argument("Bufferable::use_buffer");
  31
  32         if(buffer)
  33                 unlink_from_buffer();
  34
  35         buffer = buf;
  36         if(buffer)
  37         {
  38                 prev_in_buffer = prev;
  39                 if(prev_in_buffer)
  40                 {
  41                         next_in_buffer = prev_in_buffer->next_in_buffer;
  42                         prev_in_buffer->next_in_buffer = this;
  43                 }
  44         }
  45
  46         location_dirty = true;
  47         dirty = true;
  48         update_offset();
  49 }
  50
  51 Bufferable::AsyncUpdater *Bufferable::refresh_async() const
  52 {
  53         return dirty ? new AsyncUpdater(*this) : 0;
  54 }
  55
  56 void Bufferable::unlink_from_buffer()
  57 {
  58         if(prev_in_buffer)
  59                 prev_in_buffer->next_in_buffer = next_in_buffer;
  60         if(next_in_buffer)
  61         {
  62                 next_in_buffer->prev_in_buffer = prev_in_buffer;
  63                 next_in_buffer->update_offset();
  64         }
  65         prev_in_buffer = 0;
  66         next_in_buffer = 0;
  67         buffer = 0;
  68 }
  69
  70 void Bufferable::update_offset()
  71 {
  72         unsigned new_offset = 0;
  73         if(prev_in_buffer)
  74                 new_offset = prev_in_buffer->offset+prev_in_buffer->get_data_size();
  75
  76         unsigned align = get_alignment();
  77         new_offset += align-1;
  78         new_offset -= new_offset%align;
  79         if(new_offset!=offset)
  80         {
  81                 offset = new_offset;
  82                 location_dirty = true;
  83                 dirty = true;
  84         }
  85
  86         if(next_in_buffer)
  87                 next_in_buffer->update_offset();
  88         else if(buffer && offset+get_data_size()>buffer->get_size())
  89         {
  90                 location_dirty = true;
  91                 dirty = true;
  92         }
  93 }
  94
  95 bool Bufferable::resize_buffer() const
  96 {
  97         if(offset+get_data_size()>=buffer->get_size())
  98         {
  99                 const Bufferable *last = this;
 100                 for(; last->next_in_buffer; last=last->next_in_buffer) ;
 101
 102                 unsigned total_size = last->offset+last->get_data_size();
 103
 104                 if(total_size>buffer->get_size())
 105                 {
 106                         buffer->data(total_size, 0);
 107                         return true;
 108                 }
 109         }
 110
 111         return false;
 112 }
 113
 114 void Bufferable::update_buffer_size() const
 115 {
 116         if(resize_buffer())
 117         {
 118                 Conditional<BindRestore> _bind(!ARB_direct_state_access, buffer, buffer->get_type());
 119
 120                 /* Resizing the buffer invalidates its contents.  Non-dirty data may
 121                 be in use, so reupload it. */
 122                 for(const Bufferable *b=prev_in_buffer; b; b=b->prev_in_buffer)
 123                         if(!b->dirty)
 124                                 b->upload_data(0);
 125                 for(const Bufferable *b=next_in_buffer; b; b=b->next_in_buffer)
 126                         if(!b->dirty)
 127                                 b->upload_data(0);
 128         }
 129 }
 130
 131 void Bufferable::upload_data(char *target) const
 132 {
 133         unsigned data_size = get_data_size();
 134         if(location_dirty)
 135         {
 136                 update_buffer_size();
 137                 location_changed(buffer, offset, data_size);
 138                 location_dirty = false;
 139         }
 140
 141         if(target)
 142         {
 143                 const char *source = reinterpret_cast<const char *>(get_data_pointer());
 144                 copy(source, source+data_size, target);
 145         }
 146         else
 147                 buffer->sub_data(offset, data_size, get_data_pointer());
 148         dirty = false;
 149 }
 150
 151
 152 Bufferable::AsyncUpdater::AsyncUpdater(const Bufferable &b):
 153         bufferable(b)
 154 {
 155         buffer_resized = bufferable.resize_buffer();
 156         mapped_address = reinterpret_cast<char *>(bufferable.buffer->map(WRITE_ONLY));
 157 }
 158
 159 Bufferable::AsyncUpdater::~AsyncUpdater()
 160 {
 161         bufferable.buffer->unmap();
 162 }
 163
 164 void Bufferable::AsyncUpdater::upload_data()
 165 {
 166         bufferable.upload_data(mapped_address+bufferable.offset);
 167         // Update all bufferables in the same buffer at once
 168         for(const Bufferable *b=bufferable.prev_in_buffer; b; b=b->prev_in_buffer)
 169                 if(b->dirty || buffer_resized)
 170                         b->upload_data(mapped_address+b->offset);
 171         for(const Bufferable *b=bufferable.next_in_buffer; b; b=b->next_in_buffer)
 172                 if(b->dirty || buffer_resized)
 173                         b->upload_data(mapped_address+b->offset);
 174 }
 175
 176 } // namespace GL
 177 } // namespace Msp