mirror of https://github.com/axmolengine/axmol.git
624 lines
18 KiB
C++
624 lines
18 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2023 Arm Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// ----------------------------------------------------------------------------
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/**
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* @brief Functions to decompress a symbolic block.
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*/
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#include "astcenc_internal.h"
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#include <stdio.h>
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#include <assert.h>
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/**
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* @brief Compute the integer linear interpolation of two color endpoints.
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*
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* @param decode_mode The ASTC profile (linear or sRGB)
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* @param color0 The endpoint0 color.
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* @param color1 The endpoint1 color.
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* @param weights The interpolation weight (between 0 and 64).
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*
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* @return The interpolated color.
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*/
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static vint4 lerp_color_int(
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astcenc_profile decode_mode,
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vint4 color0,
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vint4 color1,
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vint4 weights
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) {
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vint4 weight1 = weights;
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vint4 weight0 = vint4(64) - weight1;
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if (decode_mode == ASTCENC_PRF_LDR_SRGB)
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{
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color0 = asr<8>(color0);
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color1 = asr<8>(color1);
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}
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vint4 color = (color0 * weight0) + (color1 * weight1) + vint4(32);
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color = asr<6>(color);
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if (decode_mode == ASTCENC_PRF_LDR_SRGB)
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{
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color = color * vint4(257);
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}
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return color;
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}
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/**
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* @brief Convert integer color value into a float value for the decoder.
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*
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* @param data The integer color value post-interpolation.
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* @param lns_mask If set treat lane as HDR (LNS) else LDR (unorm16).
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*
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* @return The float color value.
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*/
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static inline vfloat4 decode_texel(
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vint4 data,
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vmask4 lns_mask
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) {
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vint4 color_lns = vint4::zero();
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vint4 color_unorm = vint4::zero();
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if (any(lns_mask))
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{
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color_lns = lns_to_sf16(data);
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}
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if (!all(lns_mask))
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{
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color_unorm = unorm16_to_sf16(data);
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}
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// Pick components and then convert to FP16
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vint4 datai = select(color_unorm, color_lns, lns_mask);
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return float16_to_float(datai);
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}
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/* See header for documentation. */
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void unpack_weights(
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const block_size_descriptor& bsd,
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const symbolic_compressed_block& scb,
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const decimation_info& di,
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bool is_dual_plane,
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int weights_plane1[BLOCK_MAX_TEXELS],
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int weights_plane2[BLOCK_MAX_TEXELS]
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) {
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// Safe to overshoot as all arrays are allocated to full size
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if (!is_dual_plane)
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{
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// Build full 64-entry weight lookup table
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vint4 tab0 = vint4::load(scb.weights + 0);
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vint4 tab1 = vint4::load(scb.weights + 16);
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vint4 tab2 = vint4::load(scb.weights + 32);
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vint4 tab3 = vint4::load(scb.weights + 48);
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vint tab0p, tab1p, tab2p, tab3p;
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vtable_prepare(tab0, tab1, tab2, tab3, tab0p, tab1p, tab2p, tab3p);
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for (unsigned int i = 0; i < bsd.texel_count; i += ASTCENC_SIMD_WIDTH)
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{
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vint summed_value(8);
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vint weight_count(di.texel_weight_count + i);
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int max_weight_count = hmax(weight_count).lane<0>();
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promise(max_weight_count > 0);
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for (int j = 0; j < max_weight_count; j++)
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{
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vint texel_weights(di.texel_weights_tr[j] + i);
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vint texel_weights_int(di.texel_weight_contribs_int_tr[j] + i);
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summed_value += vtable_8bt_32bi(tab0p, tab1p, tab2p, tab3p, texel_weights) * texel_weights_int;
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}
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store(lsr<4>(summed_value), weights_plane1 + i);
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}
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}
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else
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{
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// Build a 32-entry weight lookup table per plane
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// Plane 1
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vint4 tab0_plane1 = vint4::load(scb.weights + 0);
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vint4 tab1_plane1 = vint4::load(scb.weights + 16);
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vint tab0_plane1p, tab1_plane1p;
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vtable_prepare(tab0_plane1, tab1_plane1, tab0_plane1p, tab1_plane1p);
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// Plane 2
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vint4 tab0_plane2 = vint4::load(scb.weights + 32);
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vint4 tab1_plane2 = vint4::load(scb.weights + 48);
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vint tab0_plane2p, tab1_plane2p;
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vtable_prepare(tab0_plane2, tab1_plane2, tab0_plane2p, tab1_plane2p);
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for (unsigned int i = 0; i < bsd.texel_count; i += ASTCENC_SIMD_WIDTH)
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{
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vint sum_plane1(8);
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vint sum_plane2(8);
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vint weight_count(di.texel_weight_count + i);
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int max_weight_count = hmax(weight_count).lane<0>();
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promise(max_weight_count > 0);
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for (int j = 0; j < max_weight_count; j++)
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{
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vint texel_weights(di.texel_weights_tr[j] + i);
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vint texel_weights_int(di.texel_weight_contribs_int_tr[j] + i);
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sum_plane1 += vtable_8bt_32bi(tab0_plane1p, tab1_plane1p, texel_weights) * texel_weights_int;
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sum_plane2 += vtable_8bt_32bi(tab0_plane2p, tab1_plane2p, texel_weights) * texel_weights_int;
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}
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store(lsr<4>(sum_plane1), weights_plane1 + i);
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store(lsr<4>(sum_plane2), weights_plane2 + i);
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}
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}
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}
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/**
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* @brief Return an FP32 NaN value for use in error colors.
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*
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* This NaN encoding will turn into 0xFFFF when converted to an FP16 NaN.
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*
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* @return The float color value.
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*/
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static float error_color_nan()
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{
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if32 v;
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v.u = 0xFFFFE000U;
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return v.f;
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}
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/* See header for documentation. */
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void decompress_symbolic_block(
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astcenc_profile decode_mode,
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const block_size_descriptor& bsd,
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int xpos,
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int ypos,
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int zpos,
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const symbolic_compressed_block& scb,
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image_block& blk
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) {
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blk.xpos = xpos;
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blk.ypos = ypos;
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blk.zpos = zpos;
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blk.data_min = vfloat4::zero();
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blk.data_mean = vfloat4::zero();
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blk.data_max = vfloat4::zero();
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blk.grayscale = false;
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// If we detected an error-block, blow up immediately.
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if (scb.block_type == SYM_BTYPE_ERROR)
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{
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for (unsigned int i = 0; i < bsd.texel_count; i++)
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{
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blk.data_r[i] = error_color_nan();
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blk.data_g[i] = error_color_nan();
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blk.data_b[i] = error_color_nan();
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blk.data_a[i] = error_color_nan();
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blk.rgb_lns[i] = 0;
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blk.alpha_lns[i] = 0;
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}
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return;
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}
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if ((scb.block_type == SYM_BTYPE_CONST_F16) ||
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(scb.block_type == SYM_BTYPE_CONST_U16))
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{
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vfloat4 color;
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uint8_t use_lns = 0;
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// UNORM16 constant color block
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if (scb.block_type == SYM_BTYPE_CONST_U16)
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{
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vint4 colori(scb.constant_color);
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// For sRGB decoding a real decoder would just use the top 8 bits for color conversion.
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// We don't color convert, so rescale the top 8 bits into the full 16 bit dynamic range.
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if (decode_mode == ASTCENC_PRF_LDR_SRGB)
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{
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colori = asr<8>(colori) * 257;
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}
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vint4 colorf16 = unorm16_to_sf16(colori);
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color = float16_to_float(colorf16);
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}
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// FLOAT16 constant color block
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else
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{
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switch (decode_mode)
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{
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case ASTCENC_PRF_LDR_SRGB:
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case ASTCENC_PRF_LDR:
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color = vfloat4(error_color_nan());
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break;
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case ASTCENC_PRF_HDR_RGB_LDR_A:
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case ASTCENC_PRF_HDR:
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// Constant-color block; unpack from FP16 to FP32.
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color = float16_to_float(vint4(scb.constant_color));
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use_lns = 1;
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break;
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}
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}
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for (unsigned int i = 0; i < bsd.texel_count; i++)
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{
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blk.data_r[i] = color.lane<0>();
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blk.data_g[i] = color.lane<1>();
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blk.data_b[i] = color.lane<2>();
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blk.data_a[i] = color.lane<3>();
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blk.rgb_lns[i] = use_lns;
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blk.alpha_lns[i] = use_lns;
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}
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return;
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}
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// Get the appropriate partition-table entry
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int partition_count = scb.partition_count;
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const auto& pi = bsd.get_partition_info(partition_count, scb.partition_index);
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// Get the appropriate block descriptors
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const auto& bm = bsd.get_block_mode(scb.block_mode);
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const auto& di = bsd.get_decimation_info(bm.decimation_mode);
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bool is_dual_plane = static_cast<bool>(bm.is_dual_plane);
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// Unquantize and undecimate the weights
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int plane1_weights[BLOCK_MAX_TEXELS];
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int plane2_weights[BLOCK_MAX_TEXELS];
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unpack_weights(bsd, scb, di, is_dual_plane, plane1_weights, plane2_weights);
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// Now that we have endpoint colors and weights, we can unpack texel colors
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int plane2_component = scb.plane2_component;
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vmask4 plane2_mask = vint4::lane_id() == vint4(plane2_component);
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for (int i = 0; i < partition_count; i++)
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{
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// Decode the color endpoints for this partition
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vint4 ep0;
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vint4 ep1;
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bool rgb_lns;
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bool a_lns;
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unpack_color_endpoints(decode_mode,
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scb.color_formats[i],
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scb.color_values[i],
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rgb_lns, a_lns,
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ep0, ep1);
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vmask4 lns_mask(rgb_lns, rgb_lns, rgb_lns, a_lns);
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int texel_count = pi.partition_texel_count[i];
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for (int j = 0; j < texel_count; j++)
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{
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int tix = pi.texels_of_partition[i][j];
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vint4 weight = select(vint4(plane1_weights[tix]), vint4(plane2_weights[tix]), plane2_mask);
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vint4 color = lerp_color_int(decode_mode, ep0, ep1, weight);
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vfloat4 colorf = decode_texel(color, lns_mask);
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blk.data_r[tix] = colorf.lane<0>();
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blk.data_g[tix] = colorf.lane<1>();
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blk.data_b[tix] = colorf.lane<2>();
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blk.data_a[tix] = colorf.lane<3>();
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}
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}
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}
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#if !defined(ASTCENC_DECOMPRESS_ONLY)
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/* See header for documentation. */
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float compute_symbolic_block_difference_2plane(
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const astcenc_config& config,
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const block_size_descriptor& bsd,
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const symbolic_compressed_block& scb,
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const image_block& blk
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) {
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// If we detected an error-block, blow up immediately.
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if (scb.block_type == SYM_BTYPE_ERROR)
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{
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return ERROR_CALC_DEFAULT;
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}
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assert(scb.block_mode >= 0);
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assert(scb.partition_count == 1);
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assert(bsd.get_block_mode(scb.block_mode).is_dual_plane == 1);
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// Get the appropriate block descriptor
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const block_mode& bm = bsd.get_block_mode(scb.block_mode);
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const decimation_info& di = bsd.get_decimation_info(bm.decimation_mode);
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// Unquantize and undecimate the weights
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int plane1_weights[BLOCK_MAX_TEXELS];
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int plane2_weights[BLOCK_MAX_TEXELS];
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unpack_weights(bsd, scb, di, true, plane1_weights, plane2_weights);
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vmask4 plane2_mask = vint4::lane_id() == vint4(scb.plane2_component);
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vfloat4 summa = vfloat4::zero();
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// Decode the color endpoints for this partition
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vint4 ep0;
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vint4 ep1;
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bool rgb_lns;
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bool a_lns;
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unpack_color_endpoints(config.profile,
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scb.color_formats[0],
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scb.color_values[0],
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rgb_lns, a_lns,
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ep0, ep1);
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// Unpack and compute error for each texel in the partition
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unsigned int texel_count = bsd.texel_count;
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for (unsigned int i = 0; i < texel_count; i++)
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{
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vint4 weight = select(vint4(plane1_weights[i]), vint4(plane2_weights[i]), plane2_mask);
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vint4 colori = lerp_color_int(config.profile, ep0, ep1, weight);
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vfloat4 color = int_to_float(colori);
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vfloat4 oldColor = blk.texel(i);
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// Compare error using a perceptual decode metric for RGBM textures
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if (config.flags & ASTCENC_FLG_MAP_RGBM)
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{
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// Fail encodings that result in zero weight M pixels. Note that this can cause
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// "interesting" artifacts if we reject all useful encodings - we typically get max
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// brightness encodings instead which look just as bad. We recommend users apply a
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// bias to their stored M value, limiting the lower value to 16 or 32 to avoid
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// getting small M values post-quantization, but we can't prove it would never
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// happen, especially at low bit rates ...
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if (color.lane<3>() == 0.0f)
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{
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return -ERROR_CALC_DEFAULT;
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}
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// Compute error based on decoded RGBM color
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color = vfloat4(
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color.lane<0>() * color.lane<3>() * config.rgbm_m_scale,
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color.lane<1>() * color.lane<3>() * config.rgbm_m_scale,
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color.lane<2>() * color.lane<3>() * config.rgbm_m_scale,
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1.0f
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);
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oldColor = vfloat4(
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oldColor.lane<0>() * oldColor.lane<3>() * config.rgbm_m_scale,
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oldColor.lane<1>() * oldColor.lane<3>() * config.rgbm_m_scale,
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oldColor.lane<2>() * oldColor.lane<3>() * config.rgbm_m_scale,
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1.0f
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);
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}
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vfloat4 error = oldColor - color;
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error = min(abs(error), 1e15f);
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error = error * error;
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summa += min(dot(error, blk.channel_weight), ERROR_CALC_DEFAULT);
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}
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return summa.lane<0>();
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}
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/* See header for documentation. */
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float compute_symbolic_block_difference_1plane(
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const astcenc_config& config,
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const block_size_descriptor& bsd,
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const symbolic_compressed_block& scb,
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const image_block& blk
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) {
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assert(bsd.get_block_mode(scb.block_mode).is_dual_plane == 0);
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// If we detected an error-block, blow up immediately.
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if (scb.block_type == SYM_BTYPE_ERROR)
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{
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return ERROR_CALC_DEFAULT;
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}
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assert(scb.block_mode >= 0);
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// Get the appropriate partition-table entry
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unsigned int partition_count = scb.partition_count;
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const auto& pi = bsd.get_partition_info(partition_count, scb.partition_index);
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// Get the appropriate block descriptor
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const block_mode& bm = bsd.get_block_mode(scb.block_mode);
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const decimation_info& di = bsd.get_decimation_info(bm.decimation_mode);
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// Unquantize and undecimate the weights
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int plane1_weights[BLOCK_MAX_TEXELS];
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unpack_weights(bsd, scb, di, false, plane1_weights, nullptr);
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vfloat4 summa = vfloat4::zero();
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for (unsigned int i = 0; i < partition_count; i++)
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{
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// Decode the color endpoints for this partition
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vint4 ep0;
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vint4 ep1;
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bool rgb_lns;
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bool a_lns;
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unpack_color_endpoints(config.profile,
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scb.color_formats[i],
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scb.color_values[i],
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rgb_lns, a_lns,
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ep0, ep1);
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// Unpack and compute error for each texel in the partition
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unsigned int texel_count = pi.partition_texel_count[i];
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for (unsigned int j = 0; j < texel_count; j++)
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{
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unsigned int tix = pi.texels_of_partition[i][j];
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vint4 colori = lerp_color_int(config.profile, ep0, ep1,
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vint4(plane1_weights[tix]));
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vfloat4 color = int_to_float(colori);
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vfloat4 oldColor = blk.texel(tix);
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// Compare error using a perceptual decode metric for RGBM textures
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if (config.flags & ASTCENC_FLG_MAP_RGBM)
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{
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// Fail encodings that result in zero weight M pixels. Note that this can cause
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// "interesting" artifacts if we reject all useful encodings - we typically get max
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|
// brightness encodings instead which look just as bad. We recommend users apply a
|
|
// bias to their stored M value, limiting the lower value to 16 or 32 to avoid
|
|
// getting small M values post-quantization, but we can't prove it would never
|
|
// happen, especially at low bit rates ...
|
|
if (color.lane<3>() == 0.0f)
|
|
{
|
|
return -ERROR_CALC_DEFAULT;
|
|
}
|
|
|
|
// Compute error based on decoded RGBM color
|
|
color = vfloat4(
|
|
color.lane<0>() * color.lane<3>() * config.rgbm_m_scale,
|
|
color.lane<1>() * color.lane<3>() * config.rgbm_m_scale,
|
|
color.lane<2>() * color.lane<3>() * config.rgbm_m_scale,
|
|
1.0f
|
|
);
|
|
|
|
oldColor = vfloat4(
|
|
oldColor.lane<0>() * oldColor.lane<3>() * config.rgbm_m_scale,
|
|
oldColor.lane<1>() * oldColor.lane<3>() * config.rgbm_m_scale,
|
|
oldColor.lane<2>() * oldColor.lane<3>() * config.rgbm_m_scale,
|
|
1.0f
|
|
);
|
|
}
|
|
|
|
vfloat4 error = oldColor - color;
|
|
error = min(abs(error), 1e15f);
|
|
error = error * error;
|
|
|
|
summa += min(dot(error, blk.channel_weight), ERROR_CALC_DEFAULT);
|
|
}
|
|
}
|
|
|
|
return summa.lane<0>();
|
|
}
|
|
|
|
/* 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
|
|
) {
|
|
// If we detected an error-block, blow up immediately.
|
|
if (scb.block_type == SYM_BTYPE_ERROR)
|
|
{
|
|
return ERROR_CALC_DEFAULT;
|
|
}
|
|
|
|
assert(scb.block_mode >= 0);
|
|
assert(bsd.get_partition_info(scb.partition_count, scb.partition_index).partition_count == 1);
|
|
|
|
// Get the appropriate block descriptor
|
|
const block_mode& bm = bsd.get_block_mode(scb.block_mode);
|
|
const decimation_info& di = bsd.get_decimation_info(bm.decimation_mode);
|
|
|
|
// Unquantize and undecimate the weights
|
|
alignas(ASTCENC_VECALIGN) int plane1_weights[BLOCK_MAX_TEXELS];
|
|
unpack_weights(bsd, scb, di, false, plane1_weights, nullptr);
|
|
|
|
// Decode the color endpoints for this partition
|
|
vint4 ep0;
|
|
vint4 ep1;
|
|
bool rgb_lns;
|
|
bool a_lns;
|
|
|
|
unpack_color_endpoints(config.profile,
|
|
scb.color_formats[0],
|
|
scb.color_values[0],
|
|
rgb_lns, a_lns,
|
|
ep0, ep1);
|
|
|
|
|
|
// Pre-shift sRGB so things round correctly
|
|
if (config.profile == ASTCENC_PRF_LDR_SRGB)
|
|
{
|
|
ep0 = asr<8>(ep0);
|
|
ep1 = asr<8>(ep1);
|
|
}
|
|
|
|
// Unpack and compute error for each texel in the partition
|
|
vfloatacc summav = vfloatacc::zero();
|
|
|
|
vint lane_id = vint::lane_id();
|
|
vint srgb_scale(config.profile == ASTCENC_PRF_LDR_SRGB ? 257 : 1);
|
|
|
|
unsigned int texel_count = bsd.texel_count;
|
|
for (unsigned int i = 0; i < texel_count; i += ASTCENC_SIMD_WIDTH)
|
|
{
|
|
// Compute EP1 contribution
|
|
vint weight1 = vint::loada(plane1_weights + i);
|
|
vint ep1_r = vint(ep1.lane<0>()) * weight1;
|
|
vint ep1_g = vint(ep1.lane<1>()) * weight1;
|
|
vint ep1_b = vint(ep1.lane<2>()) * weight1;
|
|
vint ep1_a = vint(ep1.lane<3>()) * weight1;
|
|
|
|
// Compute EP0 contribution
|
|
vint weight0 = vint(64) - weight1;
|
|
vint ep0_r = vint(ep0.lane<0>()) * weight0;
|
|
vint ep0_g = vint(ep0.lane<1>()) * weight0;
|
|
vint ep0_b = vint(ep0.lane<2>()) * weight0;
|
|
vint ep0_a = vint(ep0.lane<3>()) * weight0;
|
|
|
|
// Shift so things round correctly
|
|
vint colori_r = asr<6>(ep0_r + ep1_r + vint(32)) * srgb_scale;
|
|
vint colori_g = asr<6>(ep0_g + ep1_g + vint(32)) * srgb_scale;
|
|
vint colori_b = asr<6>(ep0_b + ep1_b + vint(32)) * srgb_scale;
|
|
vint colori_a = asr<6>(ep0_a + ep1_a + vint(32)) * srgb_scale;
|
|
|
|
// Compute color diff
|
|
vfloat color_r = int_to_float(colori_r);
|
|
vfloat color_g = int_to_float(colori_g);
|
|
vfloat color_b = int_to_float(colori_b);
|
|
vfloat color_a = int_to_float(colori_a);
|
|
|
|
vfloat color_orig_r = loada(blk.data_r + i);
|
|
vfloat color_orig_g = loada(blk.data_g + i);
|
|
vfloat color_orig_b = loada(blk.data_b + i);
|
|
vfloat color_orig_a = loada(blk.data_a + i);
|
|
|
|
vfloat color_error_r = min(abs(color_orig_r - color_r), vfloat(1e15f));
|
|
vfloat color_error_g = min(abs(color_orig_g - color_g), vfloat(1e15f));
|
|
vfloat color_error_b = min(abs(color_orig_b - color_b), vfloat(1e15f));
|
|
vfloat color_error_a = min(abs(color_orig_a - color_a), vfloat(1e15f));
|
|
|
|
// Compute squared error metric
|
|
color_error_r = color_error_r * color_error_r;
|
|
color_error_g = color_error_g * color_error_g;
|
|
color_error_b = color_error_b * color_error_b;
|
|
color_error_a = color_error_a * color_error_a;
|
|
|
|
vfloat metric = color_error_r * blk.channel_weight.lane<0>()
|
|
+ color_error_g * blk.channel_weight.lane<1>()
|
|
+ color_error_b * blk.channel_weight.lane<2>()
|
|
+ color_error_a * blk.channel_weight.lane<3>();
|
|
|
|
// Mask off bad lanes
|
|
vmask mask = lane_id < vint(texel_count);
|
|
lane_id += vint(ASTCENC_SIMD_WIDTH);
|
|
haccumulate(summav, metric, mask);
|
|
}
|
|
|
|
return hadd_s(summav);
|
|
}
|
|
|
|
#endif
|