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Added suppor for copying mipmaps of compressed textures

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This commit is contained in:
Robert Osfield
2004-07-05 21:09:30 +00:00
parent 4c5f33d397
commit cce00c475b
3 changed files with 137 additions and 31 deletions
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134
src/osg/Image.cpp
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@@ -403,50 +403,136 @@ void Image::readPixels(int x,int y,int width,int height,
}
void Image::readImageFromCurrentTexture(unsigned int contextID)
void Image::readImageFromCurrentTexture(unsigned int contextID, bool copyMipMapsIfAvailable)
{
const osg::Texture::Extensions* extensions = osg::Texture::getExtensions(contextID,true);
GLint internalformat;
GLint width;
GLint height;
GLint depth;
GLint numMipMaps = 0;
if (copyMipMapsIfAvailable)
{
for(;numMipMaps<20;++numMipMaps)
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, numMipMaps, GL_TEXTURE_DEPTH, &depth);
if (width==0 || height==0 || depth==0) break;
}
}
else
{
numMipMaps = 1;
}
GLint compressed = 0;
if (extensions->isCompressedTexImage2DSupported())
{
GLint compressed;
GLint compressed_size;
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB,&compressed);
}
/* if the compression has been successful */
if (compressed == GL_TRUE)
{
/* if the compression has been successful */
if (compressed == GL_TRUE)
MipmapDataType mipMapData;
unsigned int total_size = 0;
GLint i;
for(i=0;i<numMipMaps;++i)
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &compressed_size);
allocateImage(width,height,1,internalformat,internalformat);
if (i>0) mipMapData.push_back(total_size);
extensions->glGetCompressedTexImage(GL_TEXTURE_2D, 0, _data);
GLint compressed_size;
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &compressed_size);
_internalTextureFormat = internalformat;
return;
total_size += compressed_size;
}
osg::notify(osg::WARN)<<"********** reading from compressed texture -------------------."<<std::endl;
unsigned char* data = new unsigned char[total_size];
if (!data)
{
osg::notify(osg::WARN)<<"Warning: Image::readImageFromCurrentTexture(..) out of memory, now image read."<<std::endl;
return;
}
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_DEPTH, &depth);
_data = data;
_s = width;
_t = height;
_r = depth;
_pixelFormat = internalformat;
_dataType = internalformat;
_internalTextureFormat = internalformat;
_mipmapData = mipMapData;
for(i=0;i<numMipMaps;++i)
{
extensions->glGetCompressedTexImage(GL_TEXTURE_2D, i, getMipmapData(i));
}
}
else
{
MipmapDataType mipMapData;
// non compressed texture implemention.
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
unsigned int total_size = 0;
GLint i;
for(i=0;i<numMipMaps;++i)
{
if (i>0) mipMapData.push_back(total_size);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_DEPTH, &depth);
unsigned int level_size = computeRowWidthInBytes(width,_pixelFormat,GL_UNSIGNED_BYTE,_packing)*height*depth;
allocateImage(width,height,1,internalformat,GL_UNSIGNED_BYTE);
total_size += level_size;
}
unsigned char* data = new unsigned char[total_size];
if (!data)
{
osg::notify(osg::WARN)<<"Warning: Image::readImageFromCurrentTexture(..) out of memory, now image read."<<std::endl;
return;
}
_internalTextureFormat = internalformat;
glGetTexImage(GL_TEXTURE_2D,0,_pixelFormat,_dataType,_data);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_DEPTH, &depth);
_data = data;
_s = width;
_t = height;
_r = depth;
_pixelFormat = internalformat;
_dataType = GL_UNSIGNED_BYTE;
_internalTextureFormat = internalformat;
_mipmapData = mipMapData;
for(i=0;i<numMipMaps;++i)
{
glGetTexImage(GL_TEXTURE_2D,i,_pixelFormat,_dataType,getMipmapData(i));
}
}
}