Support sRGB pixelformats through GL_EXT_texture_sRGB

[libs/gl.git] / source / pixelformat.cpp

diff --git a/source/pixelformat.cpp b/source/pixelformat.cpp
index 27a814e21e1c30b946c24cf2fad6287dc073a664..027ae88c7fe1bb7c5e11290ef5133e3c143b8d05 100644 (file)
--- a/source/pixelformat.cpp
+++ b/source/pixelformat.cpp
@@ -1,11 +1,6 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "except.h"
+#include <msp/gl/extensions/arb_texture_float.h>
+#include <msp/gl/extensions/ext_bgra.h>
+#include <msp/strings/format.h>
 #include "pixelformat.h"
 
 using namespace std;
@@ -13,41 +8,44 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
-istream &operator>>(istream &in, PixelFormat &fmt)
+void operator>>(const LexicalConverter &conv, PixelFormat &fmt)
 {
-       string word;
-
-       in>>word;
-       if(word=="COLOR_INDEX")
+       if(conv.get()=="COLOR_INDEX")
                fmt = COLOR_INDEX;
-       else if(word=="STENCIL_INDEX")
+       else if(conv.get()=="STENCIL_INDEX")
                fmt = STENCIL_INDEX;
-       else if(word=="DEPTH_COMPONENT")
+       else if(conv.get()=="DEPTH_COMPONENT")
                fmt = DEPTH_COMPONENT;
-       else if(word=="RED")
+       else if(conv.get()=="RED")
                fmt = RED;
-       else if(word=="GREEN")
+       else if(conv.get()=="GREEN")
                fmt = GREEN;
-       else if(word=="BLUE")
+       else if(conv.get()=="BLUE")
                fmt = BLUE;
-       else if(word=="ALPHA")
+       else if(conv.get()=="ALPHA")
                fmt = ALPHA;
-       else if(word=="RGB")
+       else if(conv.get()=="RGB")
                fmt = RGB;
-       else if(word=="RGBA")
+       else if(conv.get()=="RGBA")
                fmt = RGBA;
-       else if(word=="BGR")
+       else if(conv.get()=="BGR")
                fmt = BGR;
-       else if(word=="BGRA")
+       else if(conv.get()=="BGRA")
                fmt = BGRA;
-       else if(word=="LUMINANCE")
+       else if(conv.get()=="SRGB")
+               fmt = SRGB;
+       else if(conv.get()=="SRGB_ALPHA")
+               fmt = SRGB_ALPHA;
+       else if(conv.get()=="LUMINANCE")
                fmt = LUMINANCE;
-       else if(word=="LUMINANCE_ALPHA")
+       else if(conv.get()=="LUMINANCE_ALPHA")
                fmt = LUMINANCE_ALPHA;
+       else if(conv.get()=="SLUMINANCE")
+               fmt = SLUMINANCE;
+       else if(conv.get()=="SLUMINANCE_ALPHA")
+               fmt = SLUMINANCE_ALPHA;
        else
-               in.setstate(ios_base::failbit);
-
-       return in;
+               throw lexical_error(format("conversion of '%s' to PixelFormat", conv.get()));
 }
 
 PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
@@ -58,10 +56,112 @@ PixelFormat pixelformat_from_graphics(Graphics::PixelFormat pf)
        case Graphics::LUMINANCE: return LUMINANCE;
        case Graphics::LUMINANCE_ALPHA: return LUMINANCE_ALPHA;
        case Graphics::RGB: return RGB;
+       case Graphics::RGBX:
        case Graphics::RGBA: return RGBA;
        case Graphics::BGR: return BGR;
+       case Graphics::BGRX:
        case Graphics::BGRA: return BGRA;
-       default: throw InvalidParameterValue("Unknown Graphics::PixelFormat");
+       default: throw invalid_argument("pixelformat_from_graphics");
+       }
+}
+
+PixelFormat storage_pixelformat_from_graphics(Graphics::PixelFormat pf)
+{
+       switch(pf)
+       {
+       case Graphics::RGBX:
+       case Graphics::BGR:
+       case Graphics::BGRX: return RGB;
+       case Graphics::BGRA: return RGBA;
+       default: return pixelformat_from_graphics(pf);
+       }
+}
+
+PixelFormat get_base_pixelformat(PixelFormat pf)
+{
+       switch(pf)
+       {
+       case RGB8:
+       case RGB16F:
+       case RGB32F:
+       case SRGB:
+       case SRGB8: return RGB;
+       case RGBA8:
+       case RGBA16F:
+       case RGBA32F:
+       case SRGB_ALPHA:
+       case SRGB8_ALPHA8: return RGBA;
+       case LUMINANCE8:
+       case LUMINANCE16F:
+       case LUMINANCE32F:
+       case SLUMINANCE:
+       case SLUMINANCE8: return LUMINANCE;
+       case LUMINANCE_ALPHA8:
+       case LUMINANCE_ALPHA16F:
+       case LUMINANCE_ALPHA32F:
+       case SLUMINANCE_ALPHA:
+       case SLUMINANCE8_ALPHA8: return LUMINANCE_ALPHA;
+       default: return pf;
+       }
+}
+
+unsigned get_component_count(PixelFormat pf)
+{
+       switch(get_base_pixelformat(pf))
+       {
+       case COLOR_INDEX:
+       case STENCIL_INDEX:
+       case DEPTH_COMPONENT:
+       case RED:
+       case GREEN:
+       case BLUE:
+       case LUMINANCE:
+       case SLUMINANCE:
+               return 1;
+       case LUMINANCE_ALPHA:
+       case SLUMINANCE_ALPHA:
+               return 2;
+       case RGB:
+       case BGR:
+               return 3;
+       case RGBA:
+       case BGRA:
+               return 4;
+       default:
+               throw invalid_argument("get_pixelformat_component_count");
+       }
+}
+
+void require_pixelformat(PixelFormat pf)
+{
+       switch(pf)
+       {
+       case RGB16F:
+       case RGB32F:
+       case RGBA16F:
+       case RGBA32F:
+       case LUMINANCE16F:
+       case LUMINANCE32F:
+       case LUMINANCE_ALPHA16F:
+       case LUMINANCE_ALPHA32F:
+               { static Require _req(ARB_texture_float); }
+               break;
+       case SRGB:
+       case SRGB8:
+       case SRGB_ALPHA:
+       case SRGB8_ALPHA8:
+       case SLUMINANCE:
+       case SLUMINANCE8:
+       case SLUMINANCE_ALPHA:
+       case SLUMINANCE8_ALPHA8:
+               { static Require _req(EXT_texture_sRGB); }
+               break;
+       case BGR:
+       case BGRA:
+               { static Require _req(EXT_bgra); }
+               break;
+       default:
+               break;
        }
 }