GLTexture* TexturesMap::capture (const LoadImageCallback& loader, const std::string& name)
{
g_debug("textures capture: '%s'\n", name.c_str());
return m_qtextures.capture(TextureKey(loader, name)).get();
}
void TexturesMap::release (GLTexture* texture)
{
g_debug("textures release: '%s'\n", texture->getName().c_str());
m_qtextures.release(TextureKey(texture->load, texture->getName()));
}
void TextureManager::CheckUpdate()
{
// The images or their lenses have changed.
// Find what size we should have the textures.
// Note that one image changing does affect the rest, if an image suddenly
// takes up more space, the others should take up less.
unsigned int num_images = m_pano->getNrOfImages();
if (num_images == 0)
{
textures.clear();
return;
}
// if we are doing photometric correction, and someone changed the output
// exposure, all of our images are at the wrong exposure.
if (photometric_correct && view_state->RequireRecalculatePhotometric())
{
textures.clear();
}
HuginBase::PanoramaOptions *dest_img = view_state->GetOptions();
// Recalculuate the ideal image density if required
// TODO tidy up once it works.
DEBUG_INFO("Updating texture sizes.");
// find the total of fields of view of the images, in degrees squared
// we assume each image has the same density across all it's pixels
double total_fov = 0.0;
for (unsigned int image_index = 0; image_index < num_images; image_index++)
{
HuginBase::SrcPanoImage *src = view_state->GetSrcImage(image_index);
double aspect = double(src->getSize().height())
/ double(src->getSize().width());
total_fov += src->getHFOV() * aspect;
};
// now find the ideal density
texel_density = double(GetMaxTotalTexels()) / total_fov;
// now recalculate the best image sizes
// The actual texture size is the biggest one possible withouth scaling the
// image up in any direction. We only specifiy mipmap levels we can fit in
// a given amount of texture memory, while respecting the image's FOV.
int texels_used = 0;
double ideal_texels_used = 0.0;
for (unsigned int image_index = 0; image_index < num_images; image_index++)
{
// find this texture
// if it has not been created before, it will be created now.
std::map<TextureKey, TextureInfo>::iterator it;
HuginBase::SrcPanoImage *img_p = view_state->GetSrcImage(image_index);
TextureKey key(img_p, &photometric_correct);
it = textures.find(key);
TextureInfo *texinfo;
/* This section would allow us to reuse textures generated when we want
* to change the size. It is not used as it causes segmentation faults
* under Ubuntu 8.04's "ati" graphics driver.
*/
#if 0
if (it == textures.end())
{
// We haven't seen this image before.
// Find a size for it and make its texture.
// store the power that 2 is raised to, not the actual size
unsigned int max_tex_width_p = int(log2(img_p->getSize().width())),
max_tex_height_p = int(log2(img_p->getSize().height()));
// check this is hardware supported.
{
unsigned int biggest = GetMaxTextureSizePower();
if (biggest < max_tex_width_p) max_tex_width_p = biggest;
if (biggest < max_tex_height_p) max_tex_height_p = biggest;
}
std::cout << "Texture size for image " << image_index << " is "
<< (1 << max_tex_width_p) << " by "
<< (1 << max_tex_height_p) << "\n";
// create a new texinfo and store the texture details.
std::cout << "About to create new TextureInfo for "
<< img_p->getFilename()
<< ".\n";
std::pair<std::map<TextureKey, TextureInfo>::iterator, bool> ins;
ins = textures.insert(std::pair<TextureKey, TextureInfo>
(TextureKey(img_p, &photometric_correct),
// the key is used to identify the image with (or without)
// photometric correction parameters.
TextureInfo(max_tex_width_p, max_tex_height_p)
));
texinfo = &((ins.first)->second);
}
else
{
texinfo = &(it->second);
}
// find the highest mipmap we want to use.
double hfov = img_p->getHFOV(),
aspect = double (texinfo->height) / double (texinfo->width),
ideal_texels = texel_density * hfov * aspect,
// we would like a mipmap with this size:
ideal_tex_width = sqrt(ideal_texels / aspect),
ideal_tex_height = aspect * ideal_tex_width;
// Ideally this mipmap would bring us up to this many texels
ideal_texels_used += ideal_texels;
std::cout << "Ideal mip size: " << ideal_tex_width << " by "
<< ideal_tex_height << "\n";
// Find the smallest mipmap level that is at least this size.
int max_mip_level = (texinfo->width_p > texinfo->height_p)
? texinfo->width_p : texinfo->height_p;
int mip_level = max_mip_level - ceil((ideal_tex_width > ideal_tex_height)
? log2(ideal_tex_width) : log2(ideal_tex_height));
// move to the next mipmap level if we are over budget.
if ((texels_used + (1 << (texinfo->width_p + texinfo->height_p
- mip_level * 2)))
> ideal_texels_used)
{
// scale down
mip_level ++;
}
// don't allow any mipmaps smaller than the 1 by 1 pixel one.
if (mip_level > max_mip_level) mip_level = max_mip_level;
// don't allow any mipmaps with a negative level of detail (scales up)
if (mip_level < 0) mip_level = 0;
// find the size of this level
int mip_width_p = texinfo->width_p - mip_level,
mip_height_p = texinfo->height_p - mip_level;
// check if we have scaled down to a single line, and make sure we
// limit the line's width to 1 pixel.
if (mip_width_p < 0) mip_width_p = 0;
if (mip_height_p < 0) mip_height_p = 0;
// now count these texels as used- we are ignoring the smaller mip
// levels, they add 1/3 on to the size.
texels_used += 1 << (mip_width_p + mip_height_p);
std::cout << "biggest mipmap of image " << image_index << " is "
<< (1 << mip_width_p) << " by " << (1 << mip_height_p)
<< " (level " << mip_level <<").\n";
std::cout << "Ideal texels used " << int(ideal_texels_used)
<< ", actually used " << texels_used << ".\n\n";
if (texinfo->min_lod != mip_level)
{
// maximum level required changed.
if (texinfo->min_lod > mip_level)
{
// generate more levels
texinfo->DefineLevels(mip_level,
(texinfo->min_lod > max_mip_level) ?
max_mip_level : texinfo->min_lod - 1,
photometric_correct, dest_img,
view_state->GetSrcImage(image_index));
}
texinfo->SetMaxLevel(mip_level);
texinfo->min_lod = mip_level;
}
}
#endif
/* Instead of the above section, replace the whole texture when appropriate:
*/
// Find a size for it
double hfov = img_p->getHFOV(),
aspect = double (img_p->getSize().height())
/ double (img_p->getSize().width()),
ideal_texels = texel_density * hfov * aspect,
// we would like a texture this size:
ideal_tex_width = sqrt(ideal_texels / aspect),
ideal_tex_height = aspect * ideal_tex_width;
// shrink if bigger than the original, avoids scaling up excessively.
if (ideal_tex_width > img_p->getSize().width())
ideal_tex_width = img_p->getSize().width();
if (ideal_tex_height > img_p->getSize().height())
ideal_tex_height = img_p->getSize().height();
// we will need to round up/down to a power of two
// round up first, then shrink if over budget.
// store the power that 2 is raised to, not the actual size
unsigned int tex_width_p = int(log2(ideal_tex_width)) + 1,
tex_height_p = int(log2(ideal_tex_height)) + 1;
// check this is hardware supported.
{
unsigned int biggest = GetMaxTextureSizePower();
if (biggest < tex_width_p) tex_width_p = biggest;
if (biggest < tex_height_p) tex_height_p = biggest;
}
// check if this is over budget.
ideal_texels_used += ideal_texels;
// while the texture is over budget, shrink it
while ( (texels_used + (1 << (tex_width_p + tex_height_p)))
> ideal_texels_used)
{
// smaller aspect means the texture is wider.
if ((double) (1 << tex_height_p) / (double) (1 << tex_width_p)
< aspect)
{
tex_width_p--;
} else {
tex_height_p--;
}
}
// we have a nice size
texels_used += 1 << (tex_width_p + tex_height_p);
if ( it == textures.end()
|| (it->second).width_p != tex_width_p
|| (it->second).height_p != tex_height_p)
{
// Either: 1. We haven't seen this image before
// or: 2. Our texture for this is image is the wrong size
// ...therefore we make a new one the right size:
//
// remove duplicate key if exists
TextureKey checkKey (img_p, &photometric_correct);
if (textures.find(checkKey) != textures.end()) {
// Already exists in map, remove it first before adding a new one
textures.erase(checkKey);
}
std::pair<std::map<TextureKey, TextureInfo>::iterator, bool> ins;
ins = textures.insert(std::pair<TextureKey, TextureInfo>
(TextureKey(img_p, &photometric_correct),
// the key is used to identify the image with (or without)
// photometric correction parameters.
TextureInfo(view_state, tex_width_p, tex_height_p)
));
// create and upload the texture image
texinfo = &((ins.first)->second);
texinfo->DefineLevels(0, // minimum mip level
// maximum mip level
tex_width_p > tex_height_p ? tex_width_p : tex_height_p,
photometric_correct,
*dest_img,
*view_state->GetSrcImage(image_index));
texinfo->DefineMaskTexture(*view_state->GetSrcImage(image_index));
}
else
{
if(view_state->RequireRecalculateMasks(image_index))
{
//mask for this image has changed, also update only mask
(*it).second.UpdateMask(*view_state->GetSrcImage(image_index));
};
}
}
