source/core/frameformat.cpp

   1 #include "error.h"
   2 #include "frameformat.h"
   3
   4 using namespace std;
   5
   6 namespace Msp {
   7 namespace GL {
   8
   9 FrameFormat::FrameFormat(FrameAttachment fa):
  10         count(1),
  11         samples(1)
  12 {
  13         attachments[0] = fa;
  14 }
  15
  16 FrameFormat FrameFormat::operator,(FrameAttachment fa) const
  17 {
  18         if(count>=MAX_ATTACHMENTS)
  19                 throw invalid_operation("FrameFormat::operator,");
  20
  21         FrameFormat result = *this;
  22         result.attachments[result.count++] = fa;
  23
  24         return result;
  25 }
  26
  27 FrameFormat FrameFormat::operator,(PixelFormat pf) const
  28 {
  29         if(!count)
  30                 throw invalid_operation("FrameFormat::operator,");
  31
  32         FrameFormat r = *this;
  33         FrameAttachment &fa = r.attachments[r.count-1];
  34         fa = make_typed_attachment(fa, pf);
  35
  36         return r;
  37 }
  38
  39 FrameFormat FrameFormat::operator,(unsigned index) const
  40 {
  41         if(!count)
  42                 throw invalid_operation("FrameFormat::operator,");
  43
  44         FrameFormat r = *this;
  45         FrameAttachment &fa = r.attachments[r.count-1];
  46         fa = make_indexed_attachment(fa, index);
  47
  48         return r;
  49 }
  50
  51 FrameFormat &FrameFormat::set_samples(unsigned s)
  52 {
  53         samples = s;
  54         return *this;
  55 }
  56
  57 int FrameFormat::index(FrameAttachment fa) const
  58 {
  59         for(unsigned i=0; i<count; ++i)
  60                 if(get_attach_point(attachments[i])==get_attach_point(fa))
  61                         return i;
  62         return -1;
  63 }
  64
  65
  66 FrameAttachment make_typed_attachment(FrameAttachment fa, PixelFormat pf)
  67 {
  68         PixelComponents comp = get_components(pf);
  69         if(get_attach_point(fa)==get_attach_point(DEPTH_ATTACHMENT))
  70         {
  71                 if(comp!=DEPTH_COMPONENT)
  72                         throw invalid_argument("make_typed_attachment");
  73         }
  74         else if(get_attach_point(fa)==get_attach_point(STENCIL_ATTACHMENT))
  75         {
  76                 if(comp!=STENCIL_INDEX)
  77                         throw invalid_argument("make_typed_attachment");
  78         }
  79         else
  80         {
  81                 if(comp!=RED && comp!=RG && comp!=RGB && comp!=RGBA)
  82                         throw invalid_argument("make_typed_attachment");
  83         }
  84
  85         DataType type = get_component_type(pf);
  86         return static_cast<FrameAttachment>((fa&0xFC00) | (is_float(type)*0x100) | get_type_size(type)<<4 | get_component_count(comp));
  87 }
  88
  89 FrameAttachment make_indexed_attachment(FrameAttachment fa, unsigned i)
  90 {
  91         if(get_attach_point(fa)==get_attach_point(COLOR_ATTACHMENT))
  92         {
  93                 if(i>61)
  94                         throw out_of_range("make_indexed_attachment");
  95                 return static_cast<FrameAttachment>(fa+(i<<10));
  96         }
  97         else
  98                 throw invalid_argument("make_indexed_attachment");
  99 }
 100
 101 PixelFormat get_attachment_pixelformat(FrameAttachment fa)
 102 {
 103         PixelComponents comp;
 104         if(get_attach_point(fa)==get_attach_point(DEPTH_ATTACHMENT))
 105                 comp = DEPTH_COMPONENT;
 106         else if(get_attach_point(fa)==get_attach_point(STENCIL_ATTACHMENT))
 107                 comp = STENCIL_INDEX;
 108         else
 109                 comp = static_cast<PixelComponents>(fa&7);
 110
 111         DataType type;
 112         if(fa&0x100)
 113                 type = static_cast<DataType>((fa&0x70)>>4 | 0x300);
 114         else
 115                 type = static_cast<DataType>((fa&0x70)>>4);
 116
 117         return make_pixelformat(comp, type);
 118 }
 119
 120 } // namespace GL
 121 } // namespace Msp