source/framebuffer.cpp

   1 #include <msp/gl/extensions/arb_draw_buffers.h>
   2 #include <msp/gl/extensions/ext_framebuffer_blit.h>
   3 #include <msp/gl/extensions/ext_framebuffer_object.h>
   4 #include "error.h"
   5 #include "framebuffer.h"
   6 #include "misc.h"
   7 #include "renderbuffer.h"
   8 #include "texture2d.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GL {
  14
  15 void operator<<(LexicalConverter &conv, FramebufferStatus status)
  16 {
  17         switch(status)
  18         {
  19         case FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
  20                 conv.result("incomplete attachment");
  21                 break;
  22         case FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
  23                 conv.result("missing attachment");
  24                 break;
  25         case FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
  26                 conv.result("mismatched attachment dimensions");
  27                 break;
  28         case FRAMEBUFFER_INCOMPLETE_FORMATS:
  29                 conv.result("mismatched attachment formats");
  30                 break;
  31         case FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
  32                 conv.result("missing draw buffer attachment");
  33                 break;
  34         case FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
  35                 conv.result("missing read buffer attachment");
  36                 break;
  37         case FRAMEBUFFER_UNSUPPORTED:
  38                 conv.result("unsupported");
  39                 break;
  40         default:
  41                 conv.result(lexical_cast<string, unsigned>(status, "%#x"));
  42                 break;
  43         }
  44 }
  45
  46 framebuffer_incomplete::framebuffer_incomplete(FramebufferStatus status):
  47         runtime_error(lexical_cast<string>(status))
  48 { }
  49
  50
  51 Framebuffer::Framebuffer(unsigned i):
  52         id(i),
  53         dirty(0)
  54 {
  55         if(id)
  56                 throw invalid_argument("System framebuffer must have id 0");
  57
  58         glGetIntegerv(GL_VIEWPORT, &view.left);
  59         width = view.width;
  60         height = view.height;
  61 }
  62
  63 Framebuffer::Framebuffer():
  64         width(0),
  65         height(0),
  66         dirty(0)
  67 {
  68         static Require _req(EXT_framebuffer_object);
  69
  70         glGenFramebuffers(1, &id);
  71 }
  72
  73 Framebuffer::~Framebuffer()
  74 {
  75         if(id)
  76                 glDeleteFramebuffers(1, &id);
  77         if(current()==this)
  78                 unbind();
  79 }
  80
  81 void Framebuffer::update_attachment(unsigned mask) const
  82 {
  83         if(current()==this)
  84         {
  85                 std::vector<GLenum> color_bufs;
  86                 color_bufs.reserve(attachments.size());
  87                 for(unsigned i=0; i<attachments.size(); ++i)
  88                 {
  89                         const Attachment &attch = attachments[i];
  90                         if(mask&(1<<i))
  91                         {
  92                                 if(attch.type==GL_RENDERBUFFER)
  93                                         glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, GL_RENDERBUFFER, attch.rbuf->get_id());
  94                                 else if(attch.type==GL_TEXTURE_2D)
  95                                 {
  96                                         static_cast<Texture2D *>(attch.tex)->allocate(attch.level);
  97                                         glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level);
  98                                 }
  99                                 else if(attch.type==GL_TEXTURE_CUBE_MAP)
 100                                 {
 101                                         static_cast<TextureCube *>(attch.tex)->allocate(attch.level);
 102                                         glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.cube_face, attch.tex->get_id(), attch.level);
 103                                 }
 104                                 else
 105                                         glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, 0, 0);
 106                         }
 107
 108                         if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
 109                                 color_bufs.push_back(attch.attachment);
 110                 }
 111
 112                 if(color_bufs.size()>1)
 113                         static Require _req(ARB_draw_buffers);
 114
 115                 GLenum first_buffer = (color_bufs.empty() ? GL_NONE : color_bufs.front());
 116                 if(ARB_draw_buffers)
 117                         glDrawBuffers(color_bufs.size(), &color_bufs[0]);
 118                 else
 119                         glDrawBuffer(first_buffer);
 120
 121                 glReadBuffer(first_buffer);
 122         }
 123         else
 124                 dirty |= mask;
 125 }
 126
 127 void Framebuffer::check_size()
 128 {
 129         bool full_viewport = (view.left==0 && view.bottom==0 && view.width==width && view.height==height);
 130         for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
 131                 if(i->type)
 132                 {
 133                         if(i->type==GL_RENDERBUFFER)
 134                         {
 135                                 width = i->rbuf->get_width();
 136                                 height = i->rbuf->get_height();
 137                         }
 138                         else if(i->type==GL_TEXTURE_2D)
 139                         {
 140                                 Texture2D *tex = static_cast<Texture2D *>(i->tex);
 141                                 width = tex->get_width();
 142                                 height = tex->get_height();
 143                         }
 144                         else if(i->type==GL_TEXTURE_CUBE_MAP)
 145                         {
 146                                 width = static_cast<TextureCube *>(i->tex)->get_size();
 147                                 height = width;
 148                         }
 149                         if(full_viewport)
 150                                 reset_viewport();
 151                         break;
 152                 }
 153 }
 154
 155 unsigned Framebuffer::get_attachment_index(FramebufferAttachment attch)
 156 {
 157         for(unsigned i=0; i<attachments.size(); ++i)
 158                 if(attachments[i].attachment==attch)
 159                         return i;
 160         attachments.push_back(Attachment(attch));
 161         return attachments.size()-1;
 162 }
 163
 164 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
 165 {
 166         if(!id)
 167                 throw invalid_operation("Framebuffer::attach");
 168
 169         unsigned i = get_attachment_index(attch);
 170         attachments[i].set(rbuf);
 171         update_attachment(1<<i);
 172         check_size();
 173 }
 174
 175 void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, unsigned level)
 176 {
 177         if(!id)
 178                 throw invalid_operation("Framebuffer::attach");
 179
 180         unsigned i = get_attachment_index(attch);
 181         attachments[i].set(tex, 0, level);
 182         update_attachment(1<<i);
 183         check_size();
 184 }
 185
 186 void Framebuffer::attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level)
 187 {
 188         if(!id)
 189                 throw invalid_operation("Framebuffer::attach");
 190
 191         unsigned i = get_attachment_index(attch);
 192         attachments[i].set(tex, face, level);
 193         update_attachment(1<<i);
 194         check_size();
 195 }
 196
 197 void Framebuffer::detach(FramebufferAttachment attch)
 198 {
 199         if(!id)
 200                 throw invalid_operation("Framebuffer::detach");
 201
 202         unsigned i = get_attachment_index(attch);
 203         attachments[i].clear();
 204         update_attachment(1<<i);
 205         check_size();
 206 }
 207
 208 FramebufferStatus Framebuffer::check_status() const
 209 {
 210         BindRestore _bind(this);
 211         return static_cast<FramebufferStatus>(glCheckFramebufferStatus(GL_FRAMEBUFFER));
 212 }
 213
 214 void Framebuffer::require_complete() const
 215 {
 216         FramebufferStatus status = check_status();
 217         if(status!=FRAMEBUFFER_COMPLETE)
 218                 throw framebuffer_incomplete(status);
 219 }
 220
 221 void Framebuffer::viewport(int l, int b, unsigned w, unsigned h)
 222 {
 223         view.left = l;
 224         view.bottom = b;
 225         view.width = w;
 226         view.height = h;
 227
 228         if(current()==this)
 229                 glViewport(view.left, view.bottom, view.width, view.height);
 230 }
 231
 232 void Framebuffer::reset_viewport()
 233 {
 234         viewport(0, 0, width, height);
 235 }
 236
 237 void Framebuffer::clear(BufferBits bits)
 238 {
 239         BindRestore _bind(this);
 240         glClear(bits);
 241 }
 242
 243 void Framebuffer::blit_from(const Framebuffer &other, int sx0, int sy0, int sx1, int sy1, int dx0, int dy0, int dx1, int dy1, BufferBits bits, bool filter)
 244 {
 245         static Require _req(EXT_framebuffer_blit);
 246
 247         const Framebuffer *old = current();
 248         if(set_current(this))
 249         {
 250                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, id);
 251                 if(dirty)
 252                 {
 253                         update_attachment(dirty);
 254                         dirty = 0;
 255                 }
 256         }
 257         if(old!=&other)
 258                 glBindFramebuffer(GL_READ_FRAMEBUFFER, other.id);
 259
 260         glBlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1, bits, (filter ? GL_LINEAR : GL_NEAREST));
 261
 262         set_current(old);
 263         glBindFramebuffer(GL_FRAMEBUFFER, (old ? old->id : 0));
 264 }
 265
 266 void Framebuffer::blit_from(const Framebuffer &other, int sx, int sy, unsigned wd, unsigned ht, int dx, int dy, BufferBits bits)
 267 {
 268         blit_from(other, sx, sy, sx+wd, sy+ht, dx, dy, dx+wd, dy+ht, bits, false);
 269 }
 270
 271 void Framebuffer::blit_from(const Framebuffer &other, BufferBits bits, bool filter)
 272 {
 273         blit_from(other, 0, 0, other.width, other.height, 0, 0, width, height, bits, filter);
 274 }
 275
 276 void Framebuffer::bind() const
 277 {
 278         if(set_current(this))
 279         {
 280                 glBindFramebuffer(GL_FRAMEBUFFER, id);
 281                 if(dirty)
 282                 {
 283                         update_attachment(dirty);
 284                         dirty = 0;
 285                 }
 286
 287                 if(width && height)
 288                         glViewport(view.left, view.bottom, view.width, view.height);
 289         }
 290 }
 291
 292 const Framebuffer *Framebuffer::current()
 293 {
 294         if(!cur_obj)
 295                 cur_obj = &system();
 296         return cur_obj;
 297 }
 298
 299 void Framebuffer::unbind()
 300 {
 301         system().bind();
 302 }
 303
 304 Framebuffer &Framebuffer::system()
 305 {
 306         static Framebuffer sys_framebuf(0);
 307         return sys_framebuf;
 308 }
 309
 310
 311 Framebuffer::Attachment::Attachment(FramebufferAttachment a):
 312         attachment(a),
 313         type(0),
 314         level(0)
 315 { }
 316
 317 void Framebuffer::Attachment::set(Renderbuffer &r)
 318 {
 319         type = GL_RENDERBUFFER;
 320         rbuf = &r;
 321         level = 0;
 322 }
 323
 324 void Framebuffer::Attachment::set(Texture &t, GLenum f, unsigned l)
 325 {
 326         type = t.get_target();
 327         tex = &t;
 328         cube_face = f;
 329         level = l;
 330 }
 331
 332 void Framebuffer::Attachment::clear()
 333 {
 334         type = 0;
 335 }
 336
 337
 338 Framebuffer::Viewport::Viewport():
 339         left(0),
 340         bottom(0),
 341         width(0),
 342         height(0)
 343 { }
 344
 345 } // namespace GL
 346 } // namespace Msp