//---------------------------------------------------------------------
void LoadTexture( const std::string& _filename,
Texture2D& _texture,
bool _srgb,
bool _allocateMipmap,
bool _verbose)
{
try
{
ilInit();
ILuint imgH;
ilGenImages(1, &imgH);
ilBindImage(imgH);
if(!ilLoadImage((const ILstring)_filename.c_str()))
{
Error("Load image error : file does not exist (%s)",_filename.c_str());
}
if(_verbose)
{
Info("Load image : %s",_filename.c_str());
}
// Convert all to RGBA. TODO Need improvement ...
GLenum format;
bool convert = false;
ILenum target;
switch(ilGetInteger(IL_IMAGE_FORMAT))
{
case IL_RGB : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_RGBA : format = GL_RGBA; break;
case IL_BGR : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_BGRA : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_LUMINANCE : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_COLOUR_INDEX : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_ALPHA : format = GL_RGBA; convert=true; target = IL_RGBA; break;
case IL_LUMINANCE_ALPHA : format = GL_RGBA; convert=true; target = IL_RGBA; break;
default : Error("Load image error : unsupported format (%s)",_filename.c_str());
}
GLenum type;
switch(ilGetInteger(IL_IMAGE_TYPE))
{
case IL_UNSIGNED_BYTE : type = GL_UNSIGNED_BYTE; break;
case IL_FLOAT : type = GL_FLOAT; break;
//case IL_BYTE : type = GL_BYTE; break;
//case IL_SHORT : type = GL_SHORT; break;
//case IL_UNSIGNED_SHORT: type = GL_UNSIGNED_SHORT; break;
//case IL_INT : type = GL_INTEGER; break;
//case IL_UNSIGNED_INT : type = GL_UNSIGNED_INT; break;
//case IL_DOUBLE : Error("Load image error : double data are not supported (%s)",_filename.c_str()); break;
default : Error("Load image error : unsupported data (%s)",_filename.c_str());
}
if(convert)
ilConvertImage(target, ilGetInteger(IL_IMAGE_TYPE));
// Flip image
ILinfo ImageInfo;
iluGetImageInfo(&ImageInfo);
if( ImageInfo.Origin == IL_ORIGIN_UPPER_LEFT )
{
iluFlipImage();
if(_verbose) Info("Flip image");
}
switch(type)
{
case GL_UNSIGNED_BYTE :
{
if(_srgb)
{
_texture.Allocate( GL_SRGB8_ALPHA8, ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT),_allocateMipmap);
if(_verbose) Info("Allocate texture - format:GL_SRGB8_ALPHA8, w:%d, h:%d, mipmap:%s",ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT), (_allocateMipmap?"TRUE":"FALSE") );
}
else
{
_texture.Allocate( GL_RGBA8, ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT),_allocateMipmap);
if(_verbose) Info("Allocate texture - format:GL_RGBA8, w:%d, h:%d, mipmap:%s",ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT), (_allocateMipmap?"TRUE":"FALSE") );
}
}
break;
case GL_FLOAT :
{
if(_srgb)
Warning("Try to convert to SRGB, but texture format is not compatible");
_texture.Allocate( GL_RGBA32F, ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT),_allocateMipmap);
if(_verbose) Info("Allocate texture - format:GL_RGBA32F, w:%d, h:%d, mipmap:%s",ilGetInteger(IL_IMAGE_WIDTH),ilGetInteger(IL_IMAGE_HEIGHT), (_allocateMipmap?"TRUE":"FALSE") );
}
break;
default :
{
Error("Load image error : unsupported data (%s)",_filename.c_str());
}
}
_texture.Fill(format,type,ilGetData());
ilDeleteImages(1, &imgH);
ilShutDown();
}
catch (const std::exception &e)
{
Error("Unable to read image file \"%s\": %s",_filename.c_str(),e.what());
}
}
