Class decimation_info

Source/astcenc_internal.h:347–413

* @brief The weight grid information for a single decimation pattern. * * ASTC can store one weight per texel, but is also capable of storing lower resolution weight grids * that are interpolated during decompression to assign a weight to a texel. Storing fewer weights * can free up a substantial amount of bits that we can then spend on more useful things, such as * more accurate endpoints an

 * for a single block size.
 */
struct decimation_info
{
	/** @brief The total number of texels in the block. */
	uint8_t texel_count;

	/** @brief The maximum number of stored weights that contribute to each texel, between 1 and 4. */
	uint8_t max_texel_weight_count;

	/** @brief The total number of weights stored. */
	uint8_t weight_count;

	/** @brief The number of stored weights in the X dimension. */
	uint8_t weight_x;

	/** @brief The number of stored weights in the Y dimension. */
	uint8_t weight_y;

	/** @brief The number of stored weights in the Z dimension. */
	uint8_t weight_z;

	/**
	 * @brief The number of weights that contribute to each texel.
	 * Value is between 1 and 4.
	 */
	ASTCENC_ALIGNAS uint8_t texel_weight_count[BLOCK_MAX_TEXELS];

	/**
	 * @brief The weight index of the N weights that are interpolated for each texel.
	 * Stored transposed to improve vectorization.
	 */
	ASTCENC_ALIGNAS uint8_t texel_weights_tr[4][BLOCK_MAX_TEXELS];

	/**
	 * @brief The bilinear contribution of the N weights that are interpolated for each texel.
	 * Value is between 0 and 16, stored transposed to improve vectorization.
	 */
	ASTCENC_ALIGNAS uint8_t texel_weight_contribs_int_tr[4][BLOCK_MAX_TEXELS];

#if !defined(ASTCENC_DECOMPRESS_ONLY)
	/**
	 * @brief The bilinear contribution of the N weights that are interpolated for each texel.
	 * Value is between 0 and 1, stored transposed to improve vectorization.
	 */
	ASTCENC_ALIGNAS float texel_weight_contribs_float_tr[4][BLOCK_MAX_TEXELS];

	/** @brief The number of texels that each stored weight contributes to. */
	ASTCENC_ALIGNAS uint8_t weight_texel_count[BLOCK_MAX_WEIGHTS];

	/**
	 * @brief The list of texels that use a specific weight index.
	 * Stored transposed to improve vectorization.
	 */
	ASTCENC_ALIGNAS uint8_t weight_texels_tr[BLOCK_MAX_TEXELS][BLOCK_MAX_WEIGHTS];

	/**
	 * @brief The bilinear contribution to the N texels that use each weight.
	 * Value is between 0 and 1, stored transposed to improve vectorization.
	 */