added option to compile EXR loading in

include/ACGL/OpenGL/Data/TextureDataLoadStore.hh

@@ -53,6 +53,8 @@ SharedTextureData loadTextureDataFromQT(const std::string &_filename);
 
 SharedTextureData loadTextureDataFromRGBE(const std::string &_filename);
 
+SharedTextureData loadTextureDataFromEXR(const std::string &_filename);
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 //                                                                           library specific save
 ///////////////////////////////////////////////////////////////////////////////////////////////////

src/ACGL/OpenGL/Data/TextureDataLoadStore.cc

@@ -25,6 +25,18 @@
 #include <QImageWriter>
 #endif
 
+// EXR:
+#ifndef ACGL_BUILD_WITH_EXR
+#define ACGL_BUILD_WITH_EXR
+#endif
+
+#ifdef ACGL_BUILD_WITH_EXR
+//#include <ImfInputFile.h>
+#include <ImfRgbaFile.h>
+using namespace Imf;
+using namespace Imath;
+#endif
+
 using namespace ACGL;
 using namespace ACGL::OpenGL;
 using namespace ACGL::Utils;
@@ -45,6 +57,8 @@ SharedTextureData loadTextureData(const std::string &_filename)
         return loadTextureDataFromLodepng( _filename );
     } else if (fileEnding == "hdr") {
         return loadTextureDataFromRGBE( _filename );
+    } else if (fileEnding == "exr") {
+        return loadTextureDataFromEXR( _filename );
     }
 #ifdef ACGL_COMPILE_WITH_QT
     else if (   fileEnding == "bmp" || fileEnding == "jpg" || fileEnding == "jpeg"
@@ -233,6 +247,44 @@ SharedTextureData loadTextureDataFromRGBE(const std::string &_filename)
     return data;
 }
 
+SharedTextureData loadTextureDataFromEXR(const std::string &_filename)
+{
+#ifndef ACGL_BUILD_WITH_EXR
+    error() << "can't load EXR file " << _filename << " ACGL was not build with EXR support" << endl;
+    return SharedTextureData();
+#else
+    SharedTextureData data = SharedTextureData( new TextureData() );
+    try {
+        // see GPU gems 1:
+        Imf::RgbaInputFile in( _filename.c_str() );
+
+        Imath::Box2i window = in.dataWindow();
+
+        Imath::V2i dimension( window.max.x - window.min.x +1,
+                              window.max.y - window.min.y +1);
+
+        unsigned char *buffer = (unsigned char *) new Imf::Rgba[ dimension.x*dimension.y ];
+
+        int dx = window.min.x;
+        int dy = window.min.y;
+
+        in.setFrameBuffer( (Imf::Rgba*)buffer-dx-dy*dimension.x, 1, dimension.x );
+        in.readPixels( window.min.y, window.max.y );
+
+        data->setData(   buffer  );
+        data->setHeight( dimension.y );
+        data->setWidth(  dimension.x  );
+        data->setFormat( GL_RGBA );
+        data->setType(   GL_HALF_FLOAT  );
+    } catch(Iex::BaseExc &e) {
+        error() << "EXR loading failed: " << e.what() << std::endl;
+        return SharedTextureData();
+    }
+
+    return data;
+#endif
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 //                                                                           library specific save
 ///////////////////////////////////////////////////////////////////////////////////////////////////