godot/thirdparty/basis_universal/encoder/basisu_gpu_texture.h

// basisu_gpu_texture.h
// Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "../transcoder/basisu.h"
#include "basisu_etc.h"

namespace basisu
{
	// GPU texture "image"
	class gpu_image
	{ … };

	gpu_image_vec;

	// KTX file writing

	bool create_ktx_texture_file(uint8_vec &ktx_data, const basisu::vector<gpu_image_vec>& gpu_images, bool cubemap_flag);
		
	bool write_compressed_texture_file(const char *pFilename, const basisu::vector<gpu_image_vec>& g, bool cubemap_flag);
	
	inline bool write_compressed_texture_file(const char *pFilename, const gpu_image_vec &g)
	{ … }

	bool write_compressed_texture_file(const char *pFilename, const gpu_image &g);
	
	bool write_3dfx_out_file(const char* pFilename, const gpu_image& gi);

	// GPU texture block unpacking
	void unpack_etc2_eac(const void *pBlock_bits, color_rgba *pPixels);
	bool unpack_bc1(const void *pBlock_bits, color_rgba *pPixels, bool set_alpha);
	void unpack_bc4(const void *pBlock_bits, uint8_t *pPixels, uint32_t stride);
	bool unpack_bc3(const void *pBlock_bits, color_rgba *pPixels);
	void unpack_bc5(const void *pBlock_bits, color_rgba *pPixels);
	bool unpack_bc7_mode6(const void *pBlock_bits, color_rgba *pPixels);
	bool unpack_bc7(const void* pBlock_bits, color_rgba* pPixels);
	void unpack_atc(const void* pBlock_bits, color_rgba* pPixels);
	bool unpack_fxt1(const void* p, color_rgba* pPixels);
	bool unpack_pvrtc2(const void* p, color_rgba* pPixels);
	void unpack_etc2_eac_r(const void *p, color_rgba* pPixels, uint32_t c);
	void unpack_etc2_eac_rg(const void* p, color_rgba* pPixels);

	// unpack_block() is primarily intended to unpack texture data created by the transcoder.
	// For some texture formats (like ETC2 RGB, PVRTC2, FXT1) it's not a complete implementation.
	bool unpack_block(texture_format fmt, const void *pBlock, color_rgba *pPixels);
			
} // namespace basisu