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/**************************************************************************/
/* texture_loader_pkm.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "texture_loader_pkm.h"
#include "core/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, bool p_no_subresource_cache) {
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_FAIL_COND_V_MSG(err != OK, RES(), "Unable to open PKM texture file '" + p_path + "'.");
// big endian
f->set_endian_swap(true);
ETC1Header h;
f->get_buffer((uint8_t *)&h.tag, sizeof(h.tag));
ERR_FAIL_COND_V_MSG(strncmp(h.tag, "PKM 10", sizeof(h.tag)), RES(), "Invalid or unsupported PKM texture file '" + p_path + "'.");
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.release();
int mipmaps = h.format;
int width = h.origWidth;
int height = h.origHeight;
Ref<Image> img = memnew(Image(width, height, mipmaps, Image::FORMAT_ETC, src_data));
Ref<ImageTexture> texture = memnew(ImageTexture);
texture->create_from_image(img);
if (r_error) {
*r_error = OK;
}
f->close();
memdelete(f);
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.get_extension().to_lower() == "pkm") {
return "ImageTexture";
}
return "";
}
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