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Fixes to osg::Image's handling of compressed formats.

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This commit is contained in:
Robert Osfield 2005-01-27 20:18:49 +00:00
parent 384e647f56
commit 9a93d7ae06
1 changed files with 38 additions and 22 deletions
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58
src/osg/Image.cpp
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@ -173,23 +173,36 @@ unsigned int Image::computeNumComponents(GLenum pixelFormat)
unsigned int Image::computePixelSizeInBits(GLenum format,GLenum type)
{
if(format & 0x80F0) /* DXT* compressed formats */
switch(format)
{
switch(format)
{
case(GL_COMPRESSED_RGB_S3TC_DXT1_EXT): return 4;
case(GL_COMPRESSED_RGB_S3TC_DXT1_EXT): return 4;
case(GL_COMPRESSED_RGBA_S3TC_DXT1_EXT): return 4;
case(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT): return 8;
case(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT): return 8;
default: break;
}
case(GL_COMPRESSED_RGBA_S3TC_DXT1_EXT): return 4;
case(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT): return 8;
case(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT): return 8;
default:
{
notify(WARN)<<"error format = "<<format<<std::endl;
return 0;
}
}
// note, haven't yet added proper handling of the ARB GL_COMPRESSRED_* pathways
// yet, no clear size for these since its probably implementation dependent
// which raises the question of how to actually querry for these sizes...
// will need to revisit this issue, for now just report an error.
// this is possible a bit of mute point though as since the ARB compressed formats
// arn't yet used for storing images to disk, so its likely that users wont have
// osg::Image's for pixel formats set the ARB compressed formats, just using these
// compressed formats as internal texture modes. This is very much speculation though
// if get the below error then its time to revist this issue :-)
// Robert Osfield, Jan 2005.
switch(format)
{
case(GL_COMPRESSED_ALPHA):
case(GL_COMPRESSED_LUMINANCE):
case(GL_COMPRESSED_LUMINANCE_ALPHA):
case(GL_COMPRESSED_INTENSITY):
case(GL_COMPRESSED_RGB):
case(GL_COMPRESSED_RGBA):
notify(WARN)<<"Image::computePixelSizeInBits(format,type) : cannot compute correct size of compressed format ("<<format<<") returning 0."<<std::endl;
return 0;
default: break;
}
switch(type)
@ -281,14 +294,17 @@ unsigned int Image::getTotalSizeInBytesIncludingMipmaps() const
if (t==0) t=1;
if (r==0) r=1;
unsigned int sizeOfLastMipMap;
if(_pixelFormat & 0x80F0)
unsigned int sizeOfLastMipMap = computeRowWidthInBytes(s,_pixelFormat,_dataType,_packing)* r*t;
switch(_pixelFormat)
{
unsigned int blockSize = (_pixelFormat == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) ? 8 : 16;
sizeOfLastMipMap = maximum(computeRowWidthInBytes(s,_pixelFormat,_dataType,_packing)* r*t, blockSize);
case(GL_COMPRESSED_RGB_S3TC_DXT1_EXT):
case(GL_COMPRESSED_RGBA_S3TC_DXT1_EXT):
sizeOfLastMipMap = maximum(sizeOfLastMipMap, 8u); // block size of 8
case(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT):
case(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT):
sizeOfLastMipMap = maximum(sizeOfLastMipMap, 16u); // block size of 16
default: break;
}
else
sizeOfLastMipMap = computeRowWidthInBytes(s,_pixelFormat,_dataType,_packing)* r*t;
// notify(INFO)<<"sizeOfLastMipMap="<<sizeOfLastMipMap<<"\ts="<<s<<"\tt="<<t<<"\tr"<<r<<std::endl;