bool ktx_texture::check_header() const
{
if (((get_num_faces() != 1) && (get_num_faces() != 6)) || (!m_header.m_pixelWidth))
return false;
if ((!m_header.m_pixelHeight) && (m_header.m_pixelDepth))
return false;
if ((get_num_faces() == 6) && ((m_header.m_pixelDepth) || (!m_header.m_pixelHeight)))
return false;
#if 0
if (m_header.m_numberOfMipmapLevels)
{
const uint32_t max_mipmap_dimension = 1U << (m_header.m_numberOfMipmapLevels - 1U);
if (max_mipmap_dimension > (VOGL_MAX(VOGL_MAX(m_header.m_pixelWidth, m_header.m_pixelHeight), m_header.m_pixelDepth)))
return false;
}
#endif
return true;
}
bool file_utils::remove_extension(dynamic_string &filename)
{
int sep = -1;
#if defined(PLATFORM_WINDOWS)
int rightmost_backslash = filename.find_right('\\');
int rightmost_forwardslash = filename.find_right('/');
sep = VOGL_MAX(rightmost_backslash,
rightmost_forwardslash);
#endif
if (sep < 0)
sep = filename.find_right('/');
int dot = filename.find_right('.');
if (dot < sep)
return false;
filename.left(dot);
return true;
}
bool ktx_texture::read_from_stream(data_stream_serializer &serializer)
{
clear();
// Read header
if (serializer.read(&m_header, 1, sizeof(m_header)) != sizeof(ktx_header))
return false;
// Check header
if (memcmp(s_ktx_file_id, m_header.m_identifier, sizeof(m_header.m_identifier)))
return false;
if ((m_header.m_endianness != KTX_OPPOSITE_ENDIAN) && (m_header.m_endianness != KTX_ENDIAN))
return false;
m_opposite_endianness = (m_header.m_endianness == KTX_OPPOSITE_ENDIAN);
if (m_opposite_endianness)
{
m_header.endian_swap();
if ((m_header.m_glTypeSize != sizeof(uint8_t)) && (m_header.m_glTypeSize != sizeof(uint16_t)) && (m_header.m_glTypeSize != sizeof(uint32_t)))
return false;
}
if (!check_header())
return false;
if (!compute_pixel_info())
{
#if VOGL_KTX_PVRTEX_WORKAROUNDS
// rg [9/10/13] - moved this check into here, instead of in compute_pixel_info(), but need to retest it.
if ((!m_header.m_glInternalFormat) && (!m_header.m_glType) && (!m_header.m_glTypeSize) && (!m_header.m_glBaseInternalFormat))
{
// PVRTexTool writes bogus headers when outputting ETC1.
console::warning("ktx_texture::compute_pixel_info: Header doesn't specify any format, assuming ETC1 and hoping for the best\n");
m_header.m_glBaseInternalFormat = KTX_RGB;
m_header.m_glInternalFormat = KTX_ETC1_RGB8_OES;
m_header.m_glTypeSize = 1;
m_block_dim = 4;
m_bytes_per_block = 8;
}
else
#endif
return false;
}
uint8_t pad_bytes[3];
// Read the key value entries
uint32_t num_key_value_bytes_remaining = m_header.m_bytesOfKeyValueData;
while (num_key_value_bytes_remaining)
{
if (num_key_value_bytes_remaining < sizeof(uint32_t))
return false;
uint32_t key_value_byte_size;
if (serializer.read(&key_value_byte_size, 1, sizeof(uint32_t)) != sizeof(uint32_t))
return false;
num_key_value_bytes_remaining -= sizeof(uint32_t);
if (m_opposite_endianness)
key_value_byte_size = utils::swap32(key_value_byte_size);
if (key_value_byte_size > num_key_value_bytes_remaining)
return false;
uint8_vec key_value_data;
if (key_value_byte_size)
{
key_value_data.resize(key_value_byte_size);
if (serializer.read(&key_value_data[0], 1, key_value_byte_size) != key_value_byte_size)
return false;
}
m_key_values.push_back(key_value_data);
uint32_t padding = 3 - ((key_value_byte_size + 3) % 4);
if (padding)
{
if (serializer.read(pad_bytes, 1, padding) != padding)
return false;
}
num_key_value_bytes_remaining -= key_value_byte_size;
if (num_key_value_bytes_remaining < padding)
return false;
num_key_value_bytes_remaining -= padding;
}
// Now read the mip levels
uint32_t total_faces = get_num_mips() * get_array_size() * get_num_faces() * get_depth();
if ((!total_faces) || (total_faces > 65535))
return false;
// See Section 2.8 of KTX file format: No rounding to block sizes should be applied for block compressed textures.
// OK, I'm going to break that rule otherwise KTX can only store a subset of textures that DDS can handle for no good reason.
#if 0
const uint32_t mip0_row_blocks = m_header.m_pixelWidth / m_block_dim;
const uint32_t mip0_col_blocks = VOGL_MAX(1, m_header.m_pixelHeight) / m_block_dim;
#else
const uint32_t mip0_row_blocks = (m_header.m_pixelWidth + m_block_dim - 1) / m_block_dim;
const uint32_t mip0_col_blocks = (VOGL_MAX(1, m_header.m_pixelHeight) + m_block_dim - 1) / m_block_dim;
#endif
if ((!mip0_row_blocks) || (!mip0_col_blocks))
return false;
const uint32_t mip0_depth = VOGL_MAX(1, m_header.m_pixelDepth);
VOGL_NOTE_UNUSED(mip0_depth);
bool has_valid_image_size_fields = true;
bool disable_mip_and_cubemap_padding = false;
#if VOGL_KTX_PVRTEX_WORKAROUNDS
{
// PVRTexTool has a bogus KTX writer that doesn't write any imageSize fields. Nice.
size_t expected_bytes_remaining = 0;
for (uint32_t mip_level = 0; mip_level < get_num_mips(); mip_level++)
{
uint32_t mip_width, mip_height, mip_depth;
get_mip_dim(mip_level, mip_width, mip_height, mip_depth);
const uint32_t mip_row_blocks = (mip_width + m_block_dim - 1) / m_block_dim;
const uint32_t mip_col_blocks = (mip_height + m_block_dim - 1) / m_block_dim;
if ((!mip_row_blocks) || (!mip_col_blocks))
return false;
expected_bytes_remaining += sizeof(uint32_t);
if ((!m_header.m_numberOfArrayElements) && (get_num_faces() == 6))
{
for (uint32_t face = 0; face < get_num_faces(); face++)
{
uint32_t slice_size = mip_row_blocks * mip_col_blocks * m_bytes_per_block;
expected_bytes_remaining += slice_size;
uint32_t num_cube_pad_bytes = 3 - ((slice_size + 3) % 4);
expected_bytes_remaining += num_cube_pad_bytes;
}
}
else
{
uint32_t total_mip_size = 0;
for (uint32_t array_element = 0; array_element < get_array_size(); array_element++)
{
for (uint32_t face = 0; face < get_num_faces(); face++)
{
for (uint32_t zslice = 0; zslice < mip_depth; zslice++)
{
uint32_t slice_size = mip_row_blocks * mip_col_blocks * m_bytes_per_block;
total_mip_size += slice_size;
}
}
}
expected_bytes_remaining += total_mip_size;
uint32_t num_mip_pad_bytes = 3 - ((total_mip_size + 3) % 4);
expected_bytes_remaining += num_mip_pad_bytes;
}
}
if (serializer.get_stream()->get_remaining() < expected_bytes_remaining)
{
has_valid_image_size_fields = false;
disable_mip_and_cubemap_padding = true;
console::warning("ktx_texture::read_from_stream: KTX file size is smaller than expected - trying to read anyway without imageSize fields\n");
}
}
#endif
for (uint32_t mip_level = 0; mip_level < get_num_mips(); mip_level++)
{
uint32_t mip_width, mip_height, mip_depth;
get_mip_dim(mip_level, mip_width, mip_height, mip_depth);
const uint32_t mip_row_blocks = (mip_width + m_block_dim - 1) / m_block_dim;
const uint32_t mip_col_blocks = (mip_height + m_block_dim - 1) / m_block_dim;
if ((!mip_row_blocks) || (!mip_col_blocks))
return false;
uint32_t image_size = 0;
if (!has_valid_image_size_fields)
{
if ((!m_header.m_numberOfArrayElements) && (get_num_faces() == 6))
{
// The KTX file format has an exception for plain cubemap textures, argh.
image_size = mip_row_blocks * mip_col_blocks * m_bytes_per_block;
}
else
{
image_size = mip_depth * mip_row_blocks * mip_col_blocks * m_bytes_per_block * get_array_size() * get_num_faces();
}
}
else
{
if (serializer.read(&image_size, 1, sizeof(image_size)) != sizeof(image_size))
return false;
if (m_opposite_endianness)
image_size = utils::swap32(image_size);
}
if (!image_size)
return false;
uint32_t total_mip_size = 0;
// The KTX file format has an exception for plain cubemap textures, argh.
if ((!m_header.m_numberOfArrayElements) && (get_num_faces() == 6))
{
// plain non-array cubemap
for (uint32_t face = 0; face < get_num_faces(); face++)
{
VOGL_ASSERT(m_image_data.size() == get_image_index(mip_level, 0, face, 0));
m_image_data.push_back(uint8_vec());
uint8_vec &image_data = m_image_data.back();
image_data.resize(image_size);
if (serializer.read(&image_data[0], 1, image_size) != image_size)
return false;
if (m_opposite_endianness)
utils::endian_swap_mem(&image_data[0], image_size, m_header.m_glTypeSize);
uint32_t num_cube_pad_bytes = disable_mip_and_cubemap_padding ? 0 : (3 - ((image_size + 3) % 4));
if (serializer.read(pad_bytes, 1, num_cube_pad_bytes) != num_cube_pad_bytes)
return false;
total_mip_size += image_size + num_cube_pad_bytes;
}
}
else
{
uint32_t num_image_bytes_remaining = image_size;
// 1D, 2D, 3D (normal or array texture), or array cubemap
for (uint32_t array_element = 0; array_element < get_array_size(); array_element++)
{
for (uint32_t face = 0; face < get_num_faces(); face++)
{
for (uint32_t zslice = 0; zslice < mip_depth; zslice++)
{
uint32_t slice_size = mip_row_blocks * mip_col_blocks * m_bytes_per_block;
if ((!slice_size) || (slice_size > num_image_bytes_remaining))
return false;
uint32_t image_index = get_image_index(mip_level, array_element, face, zslice);
m_image_data.ensure_element_is_valid(image_index);
uint8_vec &image_data = m_image_data[image_index];
image_data.resize(slice_size);
if (serializer.read(&image_data[0], 1, slice_size) != slice_size)
return false;
if (m_opposite_endianness)
utils::endian_swap_mem(&image_data[0], slice_size, m_header.m_glTypeSize);
num_image_bytes_remaining -= slice_size;
total_mip_size += slice_size;
}
}
}
if (num_image_bytes_remaining)
{
VOGL_ASSERT_ALWAYS;
return false;
}
}
uint32_t num_mip_pad_bytes = disable_mip_and_cubemap_padding ? 0 : (3 - ((total_mip_size + 3) % 4));
if (serializer.read(pad_bytes, 1, num_mip_pad_bytes) != num_mip_pad_bytes)
return false;
}
return true;
}
