source/framebuffer.cpp

   1 #include <msp/gl/extensions/arb_draw_buffers.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/ext_framebuffer_blit.h>
   4 #include <msp/gl/extensions/ext_framebuffer_object.h>
   5 #include <msp/gl/extensions/ext_texture_array.h>
   6 #include <msp/gl/extensions/ext_texture3d.h>
   7 #include <msp/gl/extensions/msp_buffer_control.h>
   8 #include "error.h"
   9 #include "framebuffer.h"
  10 #include "misc.h"
  11 #include "renderbuffer.h"
  12 #include "texture2d.h"
  13 #include "texture3d.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 void operator<<(LexicalConverter &conv, FramebufferStatus status)
  21 {
  22         switch(status)
  23         {
  24         case FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
  25                 conv.result("incomplete attachment");
  26                 break;
  27         case FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
  28                 conv.result("missing attachment");
  29                 break;
  30         case FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
  31                 conv.result("mismatched attachment dimensions");
  32                 break;
  33         case FRAMEBUFFER_INCOMPLETE_FORMATS:
  34                 conv.result("mismatched attachment formats");
  35                 break;
  36         case FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
  37                 conv.result("missing draw buffer attachment");
  38                 break;
  39         case FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
  40                 conv.result("missing read buffer attachment");
  41                 break;
  42         case FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
  43                 conv.result("mismatched attachment sample counts");
  44                 break;
  45         case FRAMEBUFFER_INCOMPLETE_LAYER_COUNT:
  46                 conv.result("mismatched attachment layer counts");
  47                 break;
  48         case FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
  49                 conv.result("mismatched attachment layering");
  50                 break;
  51         case FRAMEBUFFER_UNSUPPORTED:
  52                 conv.result("unsupported");
  53                 break;
  54         default:
  55                 conv.result(lexical_cast<string, unsigned>(status, "%#x"));
  56                 break;
  57         }
  58 }
  59
  60 framebuffer_incomplete::framebuffer_incomplete(FramebufferStatus status):
  61         runtime_error(lexical_cast<string>(status))
  62 { }
  63
  64
  65 Framebuffer::Framebuffer(unsigned i):
  66         id(i),
  67         dirty(0)
  68 {
  69         if(id)
  70                 throw invalid_argument("System framebuffer must have id 0");
  71
  72         glGetIntegerv(GL_VIEWPORT, &view.left);
  73         width = view.width;
  74         height = view.height;
  75 }
  76
  77 Framebuffer::Framebuffer():
  78         width(0),
  79         height(0),
  80         dirty(0)
  81 {
  82         static Require _req(EXT_framebuffer_object);
  83
  84         if(ARB_direct_state_access)
  85                 glCreateFramebuffers(1, &id);
  86         else
  87                 glGenFramebuffers(1, &id);
  88 }
  89
  90 Framebuffer::~Framebuffer()
  91 {
  92         if(id)
  93                 glDeleteFramebuffers(1, &id);
  94         if(current()==this)
  95                 unbind();
  96 }
  97
  98 void Framebuffer::update_attachment(unsigned mask) const
  99 {
 100         if(!ARB_direct_state_access && current()!=this)
 101         {
 102                 dirty |= mask;
 103                 return;
 104         }
 105
 106         std::vector<GLenum> color_bufs;
 107         color_bufs.reserve(attachments.size());
 108         for(unsigned i=0; i<attachments.size(); ++i)
 109         {
 110                 const Attachment &attch = attachments[i];
 111                 if(mask&(1<<i))
 112                 {
 113                         if(attch.type==GL_RENDERBUFFER)
 114                         {
 115                                 if(ARB_direct_state_access)
 116                                         glNamedFramebufferRenderbuffer(id, attch.attachment, GL_RENDERBUFFER, attch.rbuf->get_id());
 117                                 else
 118                                         glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, GL_RENDERBUFFER, attch.rbuf->get_id());
 119                         }
 120                         else if(attch.type==GL_TEXTURE_2D)
 121                         {
 122                                 static_cast<Texture2D *>(attch.tex)->allocate(attch.level);
 123                                 if(ARB_direct_state_access)
 124                                         glNamedFramebufferTexture(id, attch.attachment, attch.tex->get_id(), attch.level);
 125                                 else
 126                                         glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level);
 127                         }
 128                         else if(attch.type==GL_TEXTURE_3D || attch.type==GL_TEXTURE_2D_ARRAY)
 129                         {
 130                                 static_cast<Texture3D *>(attch.tex)->allocate(attch.level);
 131                                 if(ARB_direct_state_access)
 132                                         glNamedFramebufferTextureLayer(id, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
 133                                 else if(attch.type==GL_TEXTURE_2D_ARRAY)
 134                                         glFramebufferTextureLayer(GL_FRAMEBUFFER, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
 135                                 else
 136                                         glFramebufferTexture3D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level, attch.layer);
 137                         }
 138                         else if(attch.type==GL_TEXTURE_CUBE_MAP)
 139                         {
 140                                 static_cast<TextureCube *>(attch.tex)->allocate(attch.level);
 141                                 if(ARB_direct_state_access)
 142                                         glNamedFramebufferTextureLayer(id, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
 143                                 else
 144                                         glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, TextureCube::enumerate_faces(attch.layer), attch.tex->get_id(), attch.level);
 145                         }
 146                         else if(ARB_direct_state_access)
 147                                 glNamedFramebufferRenderbuffer(id, attch.attachment, 0, 0);
 148                         else
 149                                 glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, 0, 0);
 150                 }
 151
 152                 if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
 153                         color_bufs.push_back(attch.attachment);
 154         }
 155
 156         if(color_bufs.size()>1)
 157                 static Require _req(ARB_draw_buffers);
 158
 159         GLenum first_buffer = (color_bufs.empty() ? GL_NONE : color_bufs.front());
 160         if(ARB_direct_state_access)
 161         {
 162                 /* ARB_direct_state_access ties the availability of these functions to
 163                 framebuffers themselves, so no further checks are needed. */
 164                 glNamedFramebufferDrawBuffers(id, color_bufs.size(), &color_bufs[0]);
 165                 glNamedFramebufferReadBuffer(id, first_buffer);
 166         }
 167         else
 168         {
 169                 if(ARB_draw_buffers)
 170                         glDrawBuffers(color_bufs.size(), &color_bufs[0]);
 171                 else if(MSP_buffer_control)
 172                         glDrawBuffer(first_buffer);
 173
 174                 if(MSP_buffer_control)
 175                         glReadBuffer(first_buffer);
 176         }
 177 }
 178
 179 void Framebuffer::check_size()
 180 {
 181         bool full_viewport = (view.left==0 && view.bottom==0 && view.width==width && view.height==height);
 182         for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
 183                 if(i->type)
 184                 {
 185                         if(i->type==GL_RENDERBUFFER)
 186                         {
 187                                 width = i->rbuf->get_width();
 188                                 height = i->rbuf->get_height();
 189                         }
 190                         else if(i->type==GL_TEXTURE_2D)
 191                         {
 192                                 Texture2D *tex = static_cast<Texture2D *>(i->tex);
 193                                 width = max(tex->get_width()>>i->level, 1U);
 194                                 height = max(tex->get_height()>>i->level, 1U);
 195                         }
 196                         else if(i->type==GL_TEXTURE_3D || i->type==GL_TEXTURE_2D_ARRAY)
 197                         {
 198                                 Texture3D *tex = static_cast<Texture3D *>(i->tex);
 199                                 width = max(tex->get_width()>>i->level, 1U);
 200                                 height = max(tex->get_height()>>i->level, 1U);
 201                         }
 202                         else if(i->type==GL_TEXTURE_CUBE_MAP)
 203                         {
 204                                 width = max(static_cast<TextureCube *>(i->tex)->get_size()>>i->level, 1U);
 205                                 height = width;
 206                         }
 207                         if(full_viewport)
 208                                 reset_viewport();
 209                         break;
 210                 }
 211 }
 212
 213 unsigned Framebuffer::get_attachment_index(FramebufferAttachment attch)
 214 {
 215         for(unsigned i=0; i<attachments.size(); ++i)
 216                 if(attachments[i].attachment==attch)
 217                         return i;
 218         attachments.push_back(Attachment(attch));
 219         return attachments.size()-1;
 220 }
 221
 222 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
 223 {
 224         if(!id)
 225                 throw invalid_operation("Framebuffer::attach");
 226
 227         unsigned i = get_attachment_index(attch);
 228         attachments[i].set(rbuf);
 229         update_attachment(1<<i);
 230         check_size();
 231 }
 232
 233 void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, unsigned level)
 234 {
 235         if(!id)
 236                 throw invalid_operation("Framebuffer::attach");
 237
 238         unsigned i = get_attachment_index(attch);
 239         attachments[i].set(tex, level, 0);
 240         update_attachment(1<<i);
 241         check_size();
 242 }
 243
 244 void Framebuffer::attach(FramebufferAttachment attch, Texture3D &tex, unsigned layer, unsigned level)
 245 {
 246         if(!id)
 247                 throw invalid_operation("Framebuffer::attach");
 248
 249         unsigned i = get_attachment_index(attch);
 250         attachments[i].set(tex, level, layer);
 251         update_attachment(1<<i);
 252         check_size();
 253 }
 254
 255 void Framebuffer::attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level)
 256 {
 257         if(!id)
 258                 throw invalid_operation("Framebuffer::attach");
 259
 260         unsigned i = get_attachment_index(attch);
 261         attachments[i].set(tex, level, TextureCube::get_face_index(face));
 262         update_attachment(1<<i);
 263         check_size();
 264 }
 265
 266 void Framebuffer::detach(FramebufferAttachment attch)
 267 {
 268         if(!id)
 269                 throw invalid_operation("Framebuffer::detach");
 270
 271         unsigned i = get_attachment_index(attch);
 272         attachments[i].clear();
 273         update_attachment(1<<i);
 274         check_size();
 275 }
 276
 277 FramebufferStatus Framebuffer::check_status() const
 278 {
 279         if(ARB_direct_state_access)
 280                 return static_cast<FramebufferStatus>(glCheckNamedFramebufferStatus(id, GL_FRAMEBUFFER));
 281         else
 282         {
 283                 BindRestore _bind(this);
 284                 return static_cast<FramebufferStatus>(glCheckFramebufferStatus(GL_FRAMEBUFFER));
 285         }
 286 }
 287
 288 void Framebuffer::require_complete() const
 289 {
 290         FramebufferStatus status = check_status();
 291         if(status!=FRAMEBUFFER_COMPLETE)
 292                 throw framebuffer_incomplete(status);
 293 }
 294
 295 void Framebuffer::viewport(int l, int b, unsigned w, unsigned h)
 296 {
 297         view.left = l;
 298         view.bottom = b;
 299         view.width = w;
 300         view.height = h;
 301
 302         if(current()==this)
 303                 glViewport(view.left, view.bottom, view.width, view.height);
 304 }
 305
 306 void Framebuffer::reset_viewport()
 307 {
 308         viewport(0, 0, width, height);
 309 }
 310
 311 void Framebuffer::clear(BufferBits bits)
 312 {
 313         BindRestore _bind(this);
 314         glClear(bits);
 315 }
 316
 317 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)
 318 {
 319         static Require _req(EXT_framebuffer_blit);
 320
 321         if(ARB_direct_state_access)
 322         {
 323                 glBlitNamedFramebuffer(other.id, id, sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1, bits, (filter ? GL_LINEAR : GL_NEAREST));
 324                 return;
 325         }
 326
 327         const Framebuffer *old = current();
 328         if(set_current(this))
 329         {
 330                 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, id);
 331                 if(dirty)
 332                 {
 333                         update_attachment(dirty);
 334                         dirty = 0;
 335                 }
 336         }
 337         if(old!=&other)
 338                 glBindFramebuffer(GL_READ_FRAMEBUFFER, other.id);
 339
 340         glBlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1, bits, (filter ? GL_LINEAR : GL_NEAREST));
 341
 342         set_current(old);
 343         glBindFramebuffer(GL_FRAMEBUFFER, (old ? old->id : 0));
 344 }
 345
 346 void Framebuffer::blit_from(const Framebuffer &other, int sx, int sy, unsigned wd, unsigned ht, int dx, int dy, BufferBits bits)
 347 {
 348         blit_from(other, sx, sy, sx+wd, sy+ht, dx, dy, dx+wd, dy+ht, bits, false);
 349 }
 350
 351 void Framebuffer::blit_from(const Framebuffer &other, BufferBits bits, bool filter)
 352 {
 353         blit_from(other, 0, 0, other.width, other.height, 0, 0, width, height, bits, filter);
 354 }
 355
 356 void Framebuffer::bind() const
 357 {
 358         if(set_current(this))
 359         {
 360                 glBindFramebuffer(GL_FRAMEBUFFER, id);
 361                 if(dirty)
 362                 {
 363                         update_attachment(dirty);
 364                         dirty = 0;
 365                 }
 366
 367                 if(width && height)
 368                         glViewport(view.left, view.bottom, view.width, view.height);
 369         }
 370 }
 371
 372 const Framebuffer *Framebuffer::current()
 373 {
 374         if(!cur_obj)
 375                 cur_obj = &system();
 376         return cur_obj;
 377 }
 378
 379 void Framebuffer::unbind()
 380 {
 381         system().bind();
 382 }
 383
 384 Framebuffer &Framebuffer::system()
 385 {
 386         static Framebuffer sys_framebuf(0);
 387         return sys_framebuf;
 388 }
 389
 390
 391 Framebuffer::Attachment::Attachment(FramebufferAttachment a):
 392         attachment(a),
 393         type(0),
 394         level(0),
 395         layer(0)
 396 { }
 397
 398 void Framebuffer::Attachment::set(Renderbuffer &r)
 399 {
 400         type = GL_RENDERBUFFER;
 401         rbuf = &r;
 402         level = 0;
 403         layer = 0;
 404 }
 405
 406 void Framebuffer::Attachment::set(Texture &t, unsigned l, unsigned z)
 407 {
 408         type = t.get_target();
 409         tex = &t;
 410         level = l;
 411         layer = z;
 412 }
 413
 414 void Framebuffer::Attachment::clear()
 415 {
 416         type = 0;
 417 }
 418
 419
 420 Framebuffer::Viewport::Viewport():
 421         left(0),
 422         bottom(0),
 423         width(0),
 424         height(0)
 425 { }
 426
 427 } // namespace GL
 428 } // namespace Msp