astcenc_decompress_symbolic.cpp | Explore in Territory

// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2011-2024 Arm Limited
//
// 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.
// ----------------------------------------------------------------------------

/**
 * @brief Functions to decompress a symbolic block.
 */

#include "astcenc_internal.h"

#include <stdio.h>
#include <assert.h>

/**
 * @brief Compute the integer linear interpolation of two color endpoints.
 *
 * @param u8_mask       The mask for lanes using decode_unorm8 rather than decode_f16.
 * @param color0        The endpoint0 color.
 * @param color1        The endpoint1 color.
 * @param weights       The interpolation weight (between 0 and 64).
 *
 * @return The interpolated color.
 */
static vint4 lerp_color_int(
	vmask4 u8_mask,
	vint4 color0,
	vint4 color1,
	vint4 weights
) { … }

/**
 * @brief Convert integer color value into a float value for the decoder.
 *
 * @param data       The integer color value post-interpolation.
 * @param lns_mask   If set treat lane as HDR (LNS) else LDR (unorm16).
 *
 * @return The float color value.
 */
static inline vfloat4 decode_texel(
	vint4 data,
	vmask4 lns_mask
) { … }

/* See header for documentation. */
void unpack_weights(
	const block_size_descriptor& bsd,
	const symbolic_compressed_block& scb,
	const decimation_info& di,
	bool is_dual_plane,
	int weights_plane1[BLOCK_MAX_TEXELS],
	int weights_plane2[BLOCK_MAX_TEXELS]
) { … }

/**
 * @brief Return an FP32 NaN value for use in error colors.
 *
 * This NaN encoding will turn into 0xFFFF when converted to an FP16 NaN.
 *
 * @return The float color value.
 */
static float error_color_nan()
{ … }

/* See header for documentation. */
void decompress_symbolic_block(
	astcenc_profile decode_mode,
	const block_size_descriptor& bsd,
	int xpos,
	int ypos,
	int zpos,
	const symbolic_compressed_block& scb,
	image_block& blk
) { … }

#if !defined(ASTCENC_DECOMPRESS_ONLY)

/* See header for documentation. */
float compute_symbolic_block_difference_2plane(
	const astcenc_config& config,
	const block_size_descriptor& bsd,
	const symbolic_compressed_block& scb,
	const image_block& blk
) { … }

/* See header for documentation. */
float compute_symbolic_block_difference_1plane(
	const astcenc_config& config,
	const block_size_descriptor& bsd,
	const symbolic_compressed_block& scb,
	const image_block& blk
) { … }

/* See header for documentation. */
float compute_symbolic_block_difference_1plane_1partition(
	const astcenc_config& config,
	const block_size_descriptor& bsd,
	const symbolic_compressed_block& scb,
	const image_block& blk
) { … }

#endif
godot/thirdparty/astcenc/astcenc_decompress_symbolic.cpp
