34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
#include "crunch.h"
|
|
#include <stdint.h>
|
|
#include <algorithm>
|
|
#include "crunch/crn_decomp.h"
|
|
|
|
bool crunch_unpack_level(const uint8_t* data, uint32_t data_size, uint32_t level_index, void** ret, uint32_t* ret_size) {
|
|
crnd::crn_texture_info tex_info;
|
|
if (!crnd::crnd_get_texture_info(data, data_size, &tex_info))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
crnd::crnd_unpack_context pContext = crnd::crnd_unpack_begin(data, data_size);
|
|
if (!pContext)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
const crn_uint32 width = std::max(1U, tex_info.m_width >> level_index);
|
|
const crn_uint32 height = std::max(1U, tex_info.m_height >> level_index);
|
|
const crn_uint32 blocks_x = std::max(1U, (width + 3) >> 2);
|
|
const crn_uint32 blocks_y = std::max(1U, (height + 3) >> 2);
|
|
const crn_uint32 row_pitch = blocks_x * crnd::crnd_get_bytes_per_dxt_block(tex_info.m_format);
|
|
const crn_uint32 total_face_size = row_pitch * blocks_y;
|
|
*ret = new uint8_t[total_face_size];
|
|
*ret_size = total_face_size;
|
|
if (!crnd::crnd_unpack_level(pContext, ret, total_face_size, row_pitch, level_index))
|
|
{
|
|
crnd::crnd_unpack_end(pContext);
|
|
return false;
|
|
}
|
|
crnd::crnd_unpack_end(pContext);
|
|
return true;
|
|
} |