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// Copyright 2020 The SwiftShader Authors. 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.
#include "ASTC_Decoder.hpp"
#include "System/Math.hpp"
#ifdef SWIFTSHADER_ENABLE_ASTC
# include "astc_codec_internals.h"
#endif
#include <memory>
#include <unordered_map>
namespace {
#ifdef SWIFTSHADER_ENABLE_ASTC
void write_imageblock(unsigned char *img,
// picture-block to initialize with image data. We assume that orig_data is valid
const imageblock *pb,
// output dimensions
int xsize, int ysize, int zsize,
// output format
int bytes, int destPitchB, int destSliceB, bool isUnsignedByte,
// block dimensions
int xdim, int ydim, int zdim,
// position to write the block to
int xpos, int ypos, int zpos)
{
const float *fptr = pb->orig_data;
const uint8_t *nptr = pb->nan_texel;
for(int z = 0; z < zdim; z++)
{
for(int y = 0; y < ydim; y++)
{
for(int x = 0; x < xdim; x++)
{
int xi = xpos + x;
int yi = ypos + y;
int zi = zpos + z;
if(xi >= 0 && yi >= 0 && zi >= 0 && xi < xsize && yi < ysize && zi < zsize)
{
unsigned char *pix = &img[zi * destSliceB + yi * destPitchB + xi * bytes];
if(isUnsignedByte)
{
if(*nptr)
{
// NaN-pixel, but we can't display it. Display purple instead.
pix[0] = 0xFF;
pix[1] = 0x00;
pix[2] = 0xFF;
pix[3] = 0xFF;
}
else
{
pix[0] = static_cast<unsigned char>(sw::clamp(fptr[0], 0.0f, 1.0f) * 255.0f + 0.5f);
pix[1] = static_cast<unsigned char>(sw::clamp(fptr[1], 0.0f, 1.0f) * 255.0f + 0.5f);
pix[2] = static_cast<unsigned char>(sw::clamp(fptr[2], 0.0f, 1.0f) * 255.0f + 0.5f);
pix[3] = static_cast<unsigned char>(sw::clamp(fptr[3], 0.0f, 1.0f) * 255.0f + 0.5f);
}
}
else
{
if(*nptr)
{
unsigned int *pixu = reinterpret_cast<unsigned int *>(pix);
pixu[0] = pixu[1] = pixu[2] = pixu[3] = 0x7FFFFFFF; // QNaN
}
else
{
float *pixf = reinterpret_cast<float *>(pix);
pixf[0] = fptr[0];
pixf[1] = fptr[1];
pixf[2] = fptr[2];
pixf[3] = fptr[3];
}
}
}
fptr += 4;
nptr++;
}
}
}
}
#endif
} // namespace
void ASTC_Decoder::Decode(const unsigned char *source, unsigned char *dest,
int destWidth, int destHeight, int destDepth,
int bytes, int destPitchB, int destSliceB,
int xBlockSize, int yBlockSize, int zBlockSize,
int xblocks, int yblocks, int zblocks, bool isUnsignedByte)
{
#ifdef SWIFTSHADER_ENABLE_ASTC
build_quantization_mode_table();
astc_decode_mode decode_mode = isUnsignedByte ? DECODE_LDR : DECODE_HDR;
std::unique_ptr<block_size_descriptor> bsd(new block_size_descriptor);
init_block_size_descriptor(xBlockSize, yBlockSize, zBlockSize, bsd.get());
std::unique_ptr<imageblock> ib(new imageblock);
std::unique_ptr<symbolic_compressed_block> scb(new symbolic_compressed_block);
for(int z = 0; z < zblocks; z++)
{
for(int y = 0; y < yblocks; y++)
{
for(int x = 0; x < xblocks; x++, source += 16)
{
physical_to_symbolic(bsd.get(), *(physical_compressed_block *)source, scb.get());
decompress_symbolic_block(decode_mode, bsd.get(), x * xBlockSize, y * yBlockSize, z * zBlockSize, scb.get(), ib.get());
write_imageblock(dest, ib.get(), destWidth, destHeight, destDepth, bytes, destPitchB, destSliceB, isUnsignedByte,
xBlockSize, yBlockSize, zBlockSize, x * xBlockSize, y * yBlockSize, z * zBlockSize);
}
}
}
term_block_size_descriptor(bsd.get());
#endif
}