basisu_comp.h | Explore in Territory

// basisu_comp.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 "basisu_frontend.h"
#include "basisu_backend.h"
#include "basisu_basis_file.h"
#include "../transcoder/basisu_transcoder.h"
#include "basisu_uastc_enc.h"

#define BASISU_LIB_VERSION …
#define BASISU_LIB_VERSION_STRING …

#ifndef BASISD_SUPPORT_KTX2
	#error BASISD_SUPPORT_KTX2 is undefined
#endif
#ifndef BASISD_SUPPORT_KTX2_ZSTD
	#error BASISD_SUPPORT_KTX2_ZSTD is undefined
#endif

#if !BASISD_SUPPORT_KTX2
	#error BASISD_SUPPORT_KTX2 must be enabled when building the encoder. To reduce code size if KTX2 support is not needed, set BASISD_SUPPORT_KTX2_ZSTD to 0
#endif

namespace basisu
{
	struct opencl_context;
	opencl_context_ptr;

	const uint32_t BASISU_MAX_SUPPORTED_TEXTURE_DIMENSION = …;

	// Allow block's color distance to increase by 1.5 while searching for an alternative nearby endpoint.
	const float BASISU_DEFAULT_ENDPOINT_RDO_THRESH = …; 
	
	// Allow block's color distance to increase by 1.25 while searching the selector history buffer for a close enough match.
	const float BASISU_DEFAULT_SELECTOR_RDO_THRESH = …; 

	const int BASISU_DEFAULT_QUALITY = …;
	const float BASISU_DEFAULT_HYBRID_SEL_CB_QUALITY_THRESH = …;

	const uint32_t BASISU_MAX_IMAGE_DIMENSION = …;
	const uint32_t BASISU_QUALITY_MIN = …;
	const uint32_t BASISU_QUALITY_MAX = …;
	const uint32_t BASISU_MAX_ENDPOINT_CLUSTERS = …;
	const uint32_t BASISU_MAX_SELECTOR_CLUSTERS = …;

	const uint32_t BASISU_MAX_SLICES = …;

	const int BASISU_RDO_UASTC_DICT_SIZE_DEFAULT = …; // 32768;
	const int BASISU_RDO_UASTC_DICT_SIZE_MIN = …;
	const int BASISU_RDO_UASTC_DICT_SIZE_MAX = …;

	struct image_stats
	{ … };

	template<bool def>
	struct bool_param
	{ … };

	template<typename T>
	struct param
	{ … };

	struct basis_compressor_params
	{ … };

	// Important: basisu_encoder_init() MUST be called first before using this class.
	class basis_compressor
	{ … };
				
	// Alternative simple C-style wrapper API around the basis_compressor class. 
	// This doesn't expose every encoder feature, but it's enough to get going.
	// Important: basisu_encoder_init() MUST be called first before calling these functions.
	//
	// Input parameters:
	//   source_images: Array of "image" objects, one per mipmap level, largest mipmap level first.
	// OR
	//   pImageRGBA: pointer to a 32-bpp RGBx or RGBA raster image, R first in memory, A last. Top scanline first in memory.
	//   width/height/pitch_in_pixels: dimensions of pImageRGBA
	//   
	// flags_and_quality: Combination of the above flags logically OR'd with the ETC1S or UASTC level, i.e. "cFlagSRGB | cFlagGenMipsClamp | cFlagThreaded | 128" or "cFlagSRGB | cFlagGenMipsClamp | cFlagUASTC | cFlagThreaded | cPackUASTCLevelDefault".
	//	  In ETC1S mode, the lower 8-bits are the ETC1S quality level which ranges from [1,255] (higher=better quality/larger files)
	//	  In UASTC mode, the lower 8-bits are the UASTC pack level (see cPackUASTCLevelFastest, etc.). Fastest/lowest quality is 0, so be sure to set it correctly. 
	// 
	// uastc_rdo_quality: Float UASTC RDO quality level (0=no change, higher values lower quality but increase compressibility, initially try .5-1.5)
	// 
	// pSize: Returns the output data's compressed size in bytes
	// 
	// Return value is the compressed .basis or .ktx2 file data, or nullptr on failure. Must call basis_free() to free it.
	enum
	{ … };

	// This function accepts an array of source images. 
	// If more than one image is provided, it's assumed the images form a mipmap pyramid and automatic mipmap generation is disabled.
	// Returns a pointer to the compressed .basis or .ktx2 file data. *pSize is the size of the compressed data. The returned block must be freed using basis_free_data().
	// basisu_encoder_init() MUST be called first!
	void* basis_compress(
		const basisu::vector<image> &source_images,
		uint32_t flags_and_quality, float uastc_rdo_quality,
		size_t* pSize,
		image_stats* pStats = nullptr);

	// This function only accepts a single source image.
	void* basis_compress(
		const uint8_t* pImageRGBA, uint32_t width, uint32_t height, uint32_t pitch_in_pixels,
		uint32_t flags_and_quality, float uastc_rdo_quality,
		size_t* pSize,
		image_stats* pStats = nullptr);

	// Frees the dynamically allocated file data returned by basis_compress().
	void basis_free_data(void* p);

	// Runs a short benchmark using synthetic image data to time OpenCL encoding vs. CPU encoding, with multithreading enabled.
	// Returns true if opencl is worth using on this system, otherwise false.
	// If pOpenCL_failed is not null, it will be set to true if OpenCL encoding failed *on this particular machine/driver/BasisU version* and the encoder falled back to CPU encoding.
	// basisu_encoder_init() MUST be called first. If OpenCL support wasn't enabled this always returns false.
	bool basis_benchmark_etc1s_opencl(bool *pOpenCL_failed = nullptr);

	// Parallel compression API
	struct parallel_results
	{ … };
		
	// Compresses an array of input textures across total_threads threads using the basis_compressor class.
	// Compressing multiple textures at a time is substantially more efficient than just compressing one at a time.
	// total_threads must be >= 1.
	bool basis_parallel_compress(
		uint32_t total_threads,
		const basisu::vector<basis_compressor_params> &params_vec,
		basisu::vector< parallel_results > &results_vec);
		
} // namespace basisu
godot/thirdparty/basis_universal/encoder/basisu_comp.h
