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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();
PoolVector<uint8_t> src_data;
uint32_t size = h.texWidth * h.texHeight / 2;
src_data.resize(size);
PoolVector<uint8_t>::Write wb = src_data.write();
f->get_buffer(wb.ptr(),size);
wb=PoolVector<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 ClassDB::is_parent_class(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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