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