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#include "texture_loader_pkm.h"
#include "os/file_access.h"
#include <string.h>
struct ETC1Header {
char tag[6]; // "PKM 10"
uint16_t format; // Format == number of mips (== zero)
uint16_t texWidth; // Texture dimensions, multiple of 4 (big-endian)
uint16_t texHeight;
uint16_t origWidth; // Original dimensions (big-endian)
uint16_t origHeight;
};
RES ResourceFormatPKM::load(const String &p_path, const String &p_original_path, Error *r_error) {
if (r_error)
*r_error = ERR_CANT_OPEN;
Error err;
FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);
if (!f)
return RES();
FileAccessRef fref(f);
if (r_error)
*r_error = ERR_FILE_CORRUPT;
ERR_EXPLAIN("Unable to open PKM texture file: " + p_path);
ERR_FAIL_COND_V(err != OK, RES());
// big endian
f->set_endian_swap(true);
ETC1Header h;
ERR_EXPLAIN("Invalid or Unsupported PKM texture file: " + p_path);
f->get_buffer((uint8_t *)&h.tag, sizeof(h.tag));
if (strncmp(h.tag, "PKM 10", sizeof(h.tag)))
ERR_FAIL_V(RES());
h.format = f->get_16();
h.texWidth = f->get_16();
h.texHeight = f->get_16();
h.origWidth = f->get_16();
h.origHeight = f->get_16();
DVector<uint8_t> src_data;
uint32_t size = h.texWidth * h.texHeight / 2;
src_data.resize(size);
DVector<uint8_t>::Write wb = src_data.write();
f->get_buffer(wb.ptr(), size);
wb = DVector<uint8_t>::Write();
int mipmaps = h.format;
int width = h.origWidth;
int height = h.origHeight;
Image img(width, height, mipmaps, Image::FORMAT_ETC, src_data);
Ref<ImageTexture> texture = memnew(ImageTexture);
texture->create_from_image(img);
if (r_error)
*r_error = OK;
return texture;
}
void ResourceFormatPKM::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("pkm");
}
bool ResourceFormatPKM::handles_type(const String &p_type) const {
return ObjectTypeDB::is_type(p_type, "Texture");
}
String ResourceFormatPKM::get_resource_type(const String &p_path) const {
if (p_path.extension().to_lower() == "pkm")
return "ImageTexture";
return "";
}
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