source/pixelformat.cpp

   1 #include <msp/gl/extensions/arb_texture_float.h>
   2 #include <msp/gl/extensions/ext_bgra.h>
   3 #include <msp/strings/format.h>
   4 #include "pixelformat.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 void operator>>(const LexicalConverter &conv, PixelFormat &fmt)
  12 {
  13         if(conv.get()=="STENCIL_INDEX")
  14                 fmt = STENCIL_INDEX;
  15         else if(conv.get()=="DEPTH_COMPONENT")
  16                 fmt = DEPTH_COMPONENT;
  17         else if(conv.get()=="RGB")
  18                 fmt = RGB;
  19         else if(conv.get()=="RGBA")
  20                 fmt = RGBA;
  21         else if(conv.get()=="BGR")
  22                 fmt = BGR;
  23         else if(conv.get()=="BGRA")
  24                 fmt = BGRA;
  25         else if(conv.get()=="SRGB")
  26                 fmt = SRGB;
  27         else if(conv.get()=="SRGB_ALPHA")
  28                 fmt = SRGB_ALPHA;
  29         else if(conv.get()=="LUMINANCE")
  30                 fmt = LUMINANCE;
  31         else if(conv.get()=="LUMINANCE_ALPHA")
  32                 fmt = LUMINANCE_ALPHA;
  33         else if(conv.get()=="SLUMINANCE")
  34                 fmt = SLUMINANCE;
  35         else if(conv.get()=="SLUMINANCE_ALPHA")
  36                 fmt = SLUMINANCE_ALPHA;
  37         else
  38                 throw lexical_error(format("conversion of '%s' to PixelFormat", conv.get()));
  39 }
  40
  41 PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
  42 {
  43         switch(pf)
  44         {
  45         case Graphics::LUMINANCE: return LUMINANCE;
  46         case Graphics::LUMINANCE_ALPHA: return LUMINANCE_ALPHA;
  47         case Graphics::RGB: return RGB;
  48         case Graphics::RGBX:
  49         case Graphics::RGBA: return RGBA;
  50         case Graphics::BGR: return BGR;
  51         case Graphics::BGRX:
  52         case Graphics::BGRA: return BGRA;
  53         default: throw invalid_argument("pixelformat_from_graphics");
  54         }
  55 }
  56
  57 PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf, bool srgb)
  58 {
  59         PixelFormat result;
  60         switch(pf)
  61         {
  62         case Graphics::RGBX:
  63         case Graphics::BGR:
  64         case Graphics::BGRX: result = RGB; break;
  65         case Graphics::BGRA: result = RGBA; break;
  66         default: result = pixelformat_from_graphics(pf);
  67         }
  68
  69         if(srgb)
  70                 return get_srgb_pixelformat(result);
  71         else
  72                 return result;
  73 }
  74
  75 PixelFormat get_base_pixelformat(PixelFormat pf)
  76 {
  77         switch(pf)
  78         {
  79         case RGB8:
  80         case RGB16F:
  81         case RGB32F:
  82         case SRGB:
  83         case SRGB8: return RGB;
  84         case RGBA8:
  85         case RGBA16F:
  86         case RGBA32F:
  87         case SRGB_ALPHA:
  88         case SRGB8_ALPHA8: return RGBA;
  89         case LUMINANCE8:
  90         case LUMINANCE16F:
  91         case LUMINANCE32F:
  92         case SLUMINANCE:
  93         case SLUMINANCE8: return LUMINANCE;
  94         case LUMINANCE_ALPHA8:
  95         case LUMINANCE_ALPHA16F:
  96         case LUMINANCE_ALPHA32F:
  97         case SLUMINANCE_ALPHA:
  98         case SLUMINANCE8_ALPHA8: return LUMINANCE_ALPHA;
  99         default: return pf;
 100         }
 101 }
 102
 103 PixelFormat get_srgb_pixelformat(PixelFormat pf)
 104 {
 105         switch(pf)
 106         {
 107         case RGB: return SRGB;
 108         case RGBA: return SRGB_ALPHA;
 109         case RGB8: return SRGB8;
 110         case RGBA8: return SRGB8_ALPHA8;
 111         case LUMINANCE: return SLUMINANCE;
 112         case LUMINANCE8: return SLUMINANCE8;
 113         case LUMINANCE_ALPHA: return SLUMINANCE_ALPHA;
 114         case LUMINANCE_ALPHA8: return SLUMINANCE8_ALPHA8;
 115         default: return pf;
 116         }
 117 }
 118
 119 unsigned get_component_count(PixelFormat pf)
 120 {
 121         switch(get_base_pixelformat(pf))
 122         {
 123         case STENCIL_INDEX:
 124         case DEPTH_COMPONENT:
 125         case LUMINANCE:
 126         case SLUMINANCE:
 127                 return 1;
 128         case LUMINANCE_ALPHA:
 129         case SLUMINANCE_ALPHA:
 130                 return 2;
 131         case RGB:
 132         case BGR:
 133                 return 3;
 134         case RGBA:
 135         case BGRA:
 136                 return 4;
 137         default:
 138                 throw invalid_argument("get_component_count");
 139         }
 140 }
 141
 142 unsigned get_component_size(PixelFormat pf)
 143 {
 144         switch(pf)
 145         {
 146         case RGB16F:
 147         case RGBA16F:
 148         case LUMINANCE16F:
 149         case LUMINANCE_ALPHA16F:
 150                 return 2;
 151         case RGB32F:
 152         case RGBA32F:
 153         case LUMINANCE32F:
 154         case LUMINANCE_ALPHA32F:
 155                 return 4;
 156         default:
 157                 return 1;
 158         }
 159 }
 160
 161 unsigned get_pixel_size(PixelFormat pf)
 162 {
 163         return get_component_count(pf)*get_component_size(pf);
 164 }
 165
 166 void require_pixelformat(PixelFormat pf)
 167 {
 168         switch(pf)
 169         {
 170         case RGB16F:
 171         case RGB32F:
 172         case RGBA16F:
 173         case RGBA32F:
 174         case LUMINANCE16F:
 175         case LUMINANCE32F:
 176         case LUMINANCE_ALPHA16F:
 177         case LUMINANCE_ALPHA32F:
 178                 { static Require _req(ARB_texture_float); }
 179                 break;
 180         case SRGB:
 181         case SRGB8:
 182         case SRGB_ALPHA:
 183         case SRGB8_ALPHA8:
 184         case SLUMINANCE:
 185         case SLUMINANCE8:
 186         case SLUMINANCE_ALPHA:
 187         case SLUMINANCE8_ALPHA8:
 188                 { static Require _req(EXT_texture_sRGB); }
 189                 break;
 190         case BGR:
 191         case BGRA:
 192                 { static Require _req(EXT_bgra); }
 193                 break;
 194         default:
 195                 break;
 196         }
 197 }
 198
 199 } // namespace GL
 200 } // namespace Msp