source/core/frameformat.cpp

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