source/core/framebuffer.cpp

   1 #include "error.h"
   2 #include "framebuffer.h"
   3 #include "texture2d.h"
   4 #include "texture2dmultisample.h"
   5 #include "texture3d.h"
   6 #include "windowview.h"
   7
   8 using namespace std;
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 framebuffer_incomplete::framebuffer_incomplete(const std::string &reason):
  14         runtime_error(reason)
  15 { }
  16
  17
  18 Framebuffer::Framebuffer(bool s):
  19         FramebufferBackend(s)
  20 { }
  21
  22 Framebuffer::Framebuffer():
  23         FramebufferBackend(false)
  24 { }
  25
  26 Framebuffer::Framebuffer(FrameAttachment fa):
  27         Framebuffer()
  28 {
  29         set_format(fa);
  30 }
  31
  32 Framebuffer::Framebuffer(const FrameFormat &f):
  33         Framebuffer()
  34 {
  35         set_format(f);
  36 }
  37
  38 void Framebuffer::set_format(const FrameFormat &fmt)
  39 {
  40         if(!format.empty())
  41                 throw invalid_operation("Framebuffer::set_format");
  42         if(fmt.empty() || !is_format_supported(fmt))
  43                 throw invalid_argument("Framebuffer::set_format");
  44
  45         format = fmt;
  46         attachments.resize(format.size());
  47 }
  48
  49 void Framebuffer::update() const
  50 {
  51         FramebufferBackend::update(dirty);
  52         dirty = 0;
  53 }
  54
  55 void Framebuffer::check_size()
  56 {
  57         bool first = true;
  58         for(Attachment &a: attachments)
  59                 if(a.tex)
  60                 {
  61                         unsigned w = 0;
  62                         unsigned h = 0;
  63                         if(const Texture2D *tex2d = dynamic_cast<const Texture2D *>(a.tex))
  64                         {
  65                                 w = max(tex2d->get_width()>>a.level, 1U);
  66                                 h = max(tex2d->get_height()>>a.level, 1U);
  67                         }
  68                         else if(const Texture2DMultisample *tex2d_ms = dynamic_cast<const Texture2DMultisample *>(a.tex))
  69                         {
  70                                 w = tex2d_ms->get_width();
  71                                 h = tex2d_ms->get_height();
  72                         }
  73                         else if(const Texture3D *tex3d = dynamic_cast<const Texture3D *>(a.tex))
  74                         {
  75                                 w = max(tex3d->get_width()>>a.level, 1U);
  76                                 h = max(tex3d->get_height()>>a.level, 1U);
  77                         }
  78                         else if(const TextureCube *tex_cube = dynamic_cast<const TextureCube *>(a.tex))
  79                         {
  80                                 w = max(tex_cube->get_size()>>a.level, 1U);
  81                                 h = w;
  82                         }
  83
  84                         if(first)
  85                         {
  86                                 width = w;
  87                                 height = h;
  88                                 first = false;
  89                         }
  90                         else
  91                         {
  92                                 width = min(width, w);
  93                                 height = min(height, h);
  94                         }
  95                 }
  96 }
  97
  98 void Framebuffer::set_attachment(FrameAttachment attch, Texture &tex, unsigned level, int layer, unsigned samples)
  99 {
 100         if(format.empty() || attachments.empty())
 101                 throw invalid_operation("Framebuffer::attach");
 102
 103         if((format.get_samples()>1 && samples!=format.get_samples()) || (format.get_samples()==1 && samples))
 104                 throw incompatible_data("Framebuffer::attach");
 105
 106         unsigned i = 0;
 107         for(FrameAttachment a: format)
 108         {
 109                 if(a==attch)
 110                 {
 111                         attachments[i].set(tex, level, layer);
 112                         dirty |= 1<<i;
 113                         check_size();
 114                         return;
 115                 }
 116                 ++i;
 117         }
 118
 119         throw incompatible_data("Framebuffer::attach");
 120 }
 121
 122 void Framebuffer::attach(FrameAttachment attch, Texture2D &tex, unsigned level)
 123 {
 124         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, level, 0, 0);
 125 }
 126
 127 void Framebuffer::attach(FrameAttachment attch, Texture2DMultisample &tex)
 128 {
 129         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, 0, 0, tex.get_samples());
 130 }
 131
 132 void Framebuffer::attach(FrameAttachment attch, Texture3D &tex, unsigned layer, unsigned level)
 133 {
 134         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, level, layer, 0);
 135 }
 136
 137 void Framebuffer::attach(FrameAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level)
 138 {
 139         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, level, face, 0);
 140 }
 141
 142 void Framebuffer::attach_layered(FrameAttachment attch, Texture3D &tex, unsigned level)
 143 {
 144         require_layered();
 145         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, level, -1, 0);
 146 }
 147
 148 void Framebuffer::attach_layered(FrameAttachment attch, TextureCube &tex, unsigned level)
 149 {
 150         require_layered();
 151         set_attachment(make_typed_attachment(attch, tex.get_format()), tex, level, -1, 0);
 152 }
 153
 154 void Framebuffer::detach(FrameAttachment attch)
 155 {
 156         if(attachments.empty())
 157                 throw invalid_operation("Framebuffer::detach");
 158
 159         int i = format.index(attch);
 160         if(i>=0)
 161         {
 162                 attachments[i].clear();
 163                 dirty |= 1<<i;
 164                 check_size();
 165         }
 166 }
 167
 168 void Framebuffer::require_complete() const
 169 {
 170         bool layered = (!attachments.empty() && attachments.front().layer<0);
 171         for(const Attachment &a: attachments)
 172         {
 173                 if(!a.tex)
 174                         throw framebuffer_incomplete("missing attachment");
 175                 if(layered!=(a.layer<0))
 176                         throw framebuffer_incomplete("inconsistent layering");
 177         }
 178
 179         FramebufferBackend::require_complete();
 180 }
 181
 182
 183 void Framebuffer::Attachment::set(Texture &t, unsigned l, int z)
 184 {
 185         tex = &t;
 186         level = l;
 187         layer = z;
 188 }
 189
 190 void Framebuffer::Attachment::clear()
 191 {
 192         tex = 0;
 193 }
 194
 195 } // namespace GL
 196 } // namespace Msp