[Mesa-dev] [PATCH 1/7] mesa: add ASTC 2D LDR decoder
Eric Engestrom
eric.engestrom at intel.com
Tue Jul 24 10:17:25 UTC 2018
On Monday, 2018-07-23 19:52:01 -0400, Marek Olšák wrote:
> From: Marek Olšák <marek.olsak at amd.com>
>
> ---
> src/mesa/Makefile.sources | 2 +
> src/mesa/main/formats.c | 42 +
> src/mesa/main/formats.h | 3 +
> src/mesa/main/texcompress_astc.cpp | 1871 ++++++++++++++++++++++++++++
> src/mesa/main/texcompress_astc.h | 47 +
> src/util/half_float.c | 59 +
> src/util/half_float.h | 5 +
> 7 files changed, 2029 insertions(+)
> create mode 100644 src/mesa/main/texcompress_astc.cpp
> create mode 100644 src/mesa/main/texcompress_astc.h
>
> diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources
> index 63f3734c322..ae8934e2830 100644
> --- a/src/mesa/Makefile.sources
> +++ b/src/mesa/Makefile.sources
> @@ -207,20 +207,22 @@ MAIN_FILES = \
> main/shader_query.cpp \
> main/shared.c \
> main/shared.h \
> main/state.c \
> main/state.h \
> main/stencil.c \
> main/stencil.h \
> main/syncobj.c \
> main/syncobj.h \
> main/texcompress.c \
> + main/texcompress_astc.cpp \
> + main/texcompress_astc.h \
> main/texcompress_bptc.c \
> main/texcompress_bptc.h \
> main/texcompress_bptc_tmp.h \
> main/texcompress_cpal.c \
> main/texcompress_cpal.h \
> main/texcompress_etc.c \
> main/texcompress_etc.h \
> main/texcompress_etc_tmp.h \
> main/texcompress_fxt1.c \
> main/texcompress_fxt1.h \
And to avoid breaking meson :)
----8<----
diff --git a/src/mesa/meson.build b/src/mesa/meson.build
index 8fb7db215c8f39212c07..29633691ee776089bc35 100644
--- a/src/mesa/meson.build
+++ b/src/mesa/meson.build
@@ -254,6 +254,8 @@ files_libmesa_common = files(
'main/syncobj.c',
'main/syncobj.h',
'main/texcompress.c',
+ 'main/texcompress_astc.cpp',
+ 'main/texcompress_astc.h',
'main/texcompress_bptc.c',
'main/texcompress_bptc.h',
'main/texcompress_cpal.c',
---->8----
> diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
> index fdb53afd570..d4cd5d2182c 100644
> --- a/src/mesa/main/formats.c
> +++ b/src/mesa/main/formats.c
> @@ -620,20 +620,62 @@ _mesa_is_format_etc2(mesa_format format)
> case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
> case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
> case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
> return GL_TRUE;
> default:
> return GL_FALSE;
> }
> }
>
>
> +/**
> + * Return TRUE if format is an ASTC 2D compressed format.
> + */
> +bool
> +_mesa_is_format_astc_2d(mesa_format format)
> +{
> + switch (format) {
> + case MESA_FORMAT_RGBA_ASTC_4x4:
> + case MESA_FORMAT_RGBA_ASTC_5x4:
> + case MESA_FORMAT_RGBA_ASTC_5x5:
> + case MESA_FORMAT_RGBA_ASTC_6x5:
> + case MESA_FORMAT_RGBA_ASTC_6x6:
> + case MESA_FORMAT_RGBA_ASTC_8x5:
> + case MESA_FORMAT_RGBA_ASTC_8x6:
> + case MESA_FORMAT_RGBA_ASTC_8x8:
> + case MESA_FORMAT_RGBA_ASTC_10x5:
> + case MESA_FORMAT_RGBA_ASTC_10x6:
> + case MESA_FORMAT_RGBA_ASTC_10x8:
> + case MESA_FORMAT_RGBA_ASTC_10x10:
> + case MESA_FORMAT_RGBA_ASTC_12x10:
> + case MESA_FORMAT_RGBA_ASTC_12x12:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
> + case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +
> /**
> * If the given format is a compressed format, return a corresponding
> * uncompressed format.
> */
> mesa_format
> _mesa_get_uncompressed_format(mesa_format format)
> {
> switch (format) {
> case MESA_FORMAT_RGB_FXT1:
> return MESA_FORMAT_BGR_UNORM8;
> diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
> index 2afa886782b..335e4de9955 100644
> --- a/src/mesa/main/formats.h
> +++ b/src/mesa/main/formats.h
> @@ -714,20 +714,23 @@ _mesa_is_format_unsigned(mesa_format format);
>
> extern GLboolean
> _mesa_is_format_signed(mesa_format format);
>
> extern GLboolean
> _mesa_is_format_integer(mesa_format format);
>
> extern bool
> _mesa_is_format_etc2(mesa_format format);
>
> +bool
> +_mesa_is_format_astc_2d(mesa_format format);
> +
> GLenum
> _mesa_is_format_color_format(mesa_format format);
>
> extern GLenum
> _mesa_get_format_color_encoding(mesa_format format);
>
> extern GLuint
> _mesa_format_image_size(mesa_format format, GLsizei width,
> GLsizei height, GLsizei depth);
>
> diff --git a/src/mesa/main/texcompress_astc.cpp b/src/mesa/main/texcompress_astc.cpp
> new file mode 100644
> index 00000000000..996e8ea28d6
> --- /dev/null
> +++ b/src/mesa/main/texcompress_astc.cpp
> @@ -0,0 +1,1871 @@
> +/*
> + * Copyright 2015 Philip Taylor <philip at zaynar.co.uk>
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + */
> +
> +/**
> + * \file texcompress_astc.c
> + *
> + * Decompression code for GL_KHR_texture_compression_astc_ldr, which is just
> + * ASTC 2D LDR.
> + *
> + * The ASTC 2D LDR decoder (without the sRGB part) was copied from the OASTC
> + * library written by Philip Taylor. I added sRGB support and adjusted it for
> + * Mesa. - Marek
> + */
> +
> +#include "texcompress_astc.h"
> +#include "macros.h"
> +#include "util/half_float.h"
> +#include <stdio.h>
> +
> +static bool VERBOSE_DECODE = false;
> +static bool VERBOSE_WRITE = false;
> +
> +static inline uint8_t
> +uint16_div_64k_to_half_to_unorm8(uint16_t v)
> +{
> + return _mesa_half_to_unorm8(_mesa_uint16_div_64k_to_half(v));
> +}
> +
> +class decode_error
> +{
> +public:
> + enum type {
> + ok,
> + unsupported_hdr_void_extent,
> + reserved_block_mode_1,
> + reserved_block_mode_2,
> + dual_plane_and_too_many_partitions,
> + invalid_range_in_void_extent,
> + weight_grid_exceeds_block_size,
> + invalid_colour_endpoints_size,
> + invalid_colour_endpoints_count,
> + invalid_weight_bits,
> + invalid_num_weights,
> + };
> +};
> +
> +
> +struct cem_range {
> + uint8_t max;
> + uint8_t t, q, b;
> +};
> +
> +/* Based on the Color Unquantization Parameters table,
> + * plus the bit-only representations, sorted by increasing size
> + */
> +static cem_range cem_ranges[] = {
> + { 5, 1, 0, 1 },
> + { 7, 0, 0, 3 },
> + { 9, 0, 1, 1 },
> + { 11, 1, 0, 2 },
> + { 15, 0, 0, 4 },
> + { 19, 0, 1, 2 },
> + { 23, 1, 0, 3 },
> + { 31, 0, 0, 5 },
> + { 39, 0, 1, 3 },
> + { 47, 1, 0, 4 },
> + { 63, 0, 0, 6 },
> + { 79, 0, 1, 4 },
> + { 95, 1, 0, 5 },
> + { 127, 0, 0, 7 },
> + { 159, 0, 1, 5 },
> + { 191, 1, 0, 6 },
> + { 255, 0, 0, 8 },
> +};
> +
> +#define CAT_BITS_2(a, b) ( ((a) << 1) | (b) )
> +#define CAT_BITS_3(a, b, c) ( ((a) << 2) | ((b) << 1) | (c) )
> +#define CAT_BITS_4(a, b, c, d) ( ((a) << 3) | ((b) << 2) | ((c) << 1) | (d) )
> +#define CAT_BITS_5(a, b, c, d, e) ( ((a) << 4) | ((b) << 3) | ((c) << 2) | ((d) << 1) | (e) )
> +
> +/**
> + * Unpack 5n+8 bits from 'in' into 5 output values.
> + * If n <= 4 then T should be uint32_t, else it must be uint64_t.
> + */
> +template <typename T>
> +static void unpack_trit_block(int n, T in, uint8_t *out)
> +{
> + assert(n <= 6); /* else output will overflow uint8_t */
> +
> + uint8_t T0 = (in >> (n)) & 0b1;
> + uint8_t T1 = (in >> (n+1)) & 0b1;
> + uint8_t T2 = (in >> (2*n+2)) & 0b1;
> + uint8_t T3 = (in >> (2*n+3)) & 0b1;
> + uint8_t T4 = (in >> (3*n+4)) & 0b1;
> + uint8_t T5 = (in >> (4*n+5)) & 0b1;
> + uint8_t T6 = (in >> (4*n+6)) & 0b1;
> + uint8_t T7 = (in >> (5*n+7)) & 0b1;
> + uint8_t mmask = (1 << n) - 1;
> + uint8_t m0 = (in >> (0)) & mmask;
> + uint8_t m1 = (in >> (n+2)) & mmask;
> + uint8_t m2 = (in >> (2*n+4)) & mmask;
> + uint8_t m3 = (in >> (3*n+5)) & mmask;
> + uint8_t m4 = (in >> (4*n+7)) & mmask;
> +
> + uint8_t C;
> + uint8_t t4, t3, t2, t1, t0;
> + if (CAT_BITS_3(T4, T3, T2) == 0b111) {
> + C = CAT_BITS_5(T7, T6, T5, T1, T0);
> + t4 = t3 = 2;
> + } else {
> + C = CAT_BITS_5(T4, T3, T2, T1, T0);
> + if (CAT_BITS_2(T6, T5) == 0b11) {
> + t4 = 2;
> + t3 = T7;
> + } else {
> + t4 = T7;
> + t3 = CAT_BITS_2(T6, T5);
> + }
> + }
> +
> + if ((C & 0b11) == 0b11) {
> + t2 = 2;
> + t1 = (C >> 4) & 0b1;
> + uint8_t C3 = (C >> 3) & 0b1;
> + uint8_t C2 = (C >> 2) & 0b1;
> + t0 = (C3 << 1) | (C2 & ~C3);
> + } else if (((C >> 2) & 0b11) == 0b11) {
> + t2 = 2;
> + t1 = 2;
> + t0 = C & 0b11;
> + } else {
> + t2 = (C >> 4) & 0b1;
> + t1 = (C >> 2) & 0b11;
> + uint8_t C1 = (C >> 1) & 0b1;
> + uint8_t C0 = (C >> 0) & 0b1;
> + t0 = (C1 << 1) | (C0 & ~C1);
> + }
> +
> + out[0] = (t0 << n) | m0;
> + out[1] = (t1 << n) | m1;
> + out[2] = (t2 << n) | m2;
> + out[3] = (t3 << n) | m3;
> + out[4] = (t4 << n) | m4;
> +}
> +
> +/**
> + * Unpack 3n+7 bits from 'in' into 3 output values
> + */
> +static void unpack_quint_block(int n, uint32_t in, uint8_t *out)
> +{
> + assert(n <= 5); /* else output will overflow uint8_t */
> +
> + uint8_t Q0 = (in >> (n)) & 0b1;
> + uint8_t Q1 = (in >> (n+1)) & 0b1;
> + uint8_t Q2 = (in >> (n+2)) & 0b1;
> + uint8_t Q3 = (in >> (2*n+3)) & 0b1;
> + uint8_t Q4 = (in >> (2*n+4)) & 0b1;
> + uint8_t Q5 = (in >> (3*n+5)) & 0b1;
> + uint8_t Q6 = (in >> (3*n+6)) & 0b1;
> + uint8_t mmask = (1 << n) - 1;
> + uint8_t m0 = (in >> (0)) & mmask;
> + uint8_t m1 = (in >> (n+3)) & mmask;
> + uint8_t m2 = (in >> (2*n+5)) & mmask;
> +
> + uint8_t C;
> + uint8_t q2, q1, q0;
> + if (CAT_BITS_4(Q6, Q5, Q2, Q1) == 0b0011) {
> + q2 = CAT_BITS_3(Q0, Q4 & ~Q0, Q3 & ~Q0);
> + q1 = 4;
> + q0 = 4;
> + } else {
> + if (CAT_BITS_2(Q2, Q1) == 0b11) {
> + q2 = 4;
> + C = CAT_BITS_5(Q4, Q3, 0b1 & ~Q6, 0b1 & ~Q5, Q0);
> + } else {
> + q2 = CAT_BITS_2(Q6, Q5);
> + C = CAT_BITS_5(Q4, Q3, Q2, Q1, Q0);
> + }
> + if ((C & 0b111) == 0b101) {
> + q1 = 4;
> + q0 = (C >> 3) & 0b11;
> + } else {
> + q1 = (C >> 3) & 0b11;
> + q0 = C & 0b111;
> + }
> + }
> + out[0] = (q0 << n) | m0;
> + out[1] = (q1 << n) | m1;
> + out[2] = (q2 << n) | m2;
> +}
> +
> +
> +struct uint8x4_t
> +{
> + uint8_t v[4];
> +
> + uint8x4_t() { }
> +
> + uint8x4_t(int a, int b, int c, int d)
> + {
> + assert(0 <= a && a <= 255);
> + assert(0 <= b && b <= 255);
> + assert(0 <= c && c <= 255);
> + assert(0 <= d && d <= 255);
> + v[0] = a;
> + v[1] = b;
> + v[2] = c;
> + v[3] = d;
> + }
> +
> + static uint8x4_t clamped(int a, int b, int c, int d)
> + {
> + uint8x4_t r;
> + r.v[0] = MAX2(0, MIN2(255, a));
> + r.v[1] = MAX2(0, MIN2(255, b));
> + r.v[2] = MAX2(0, MIN2(255, c));
> + r.v[3] = MAX2(0, MIN2(255, d));
> + return r;
> + }
> +};
> +
> +static uint8x4_t blue_contract(int r, int g, int b, int a)
> +{
> + return uint8x4_t((r+b) >> 1, (g+b) >> 1, b, a);
> +}
> +
> +static uint8x4_t blue_contract_clamped(int r, int g, int b, int a)
> +{
> + return uint8x4_t::clamped((r+b) >> 1, (g+b) >> 1, b, a);
> +}
> +
> +static void bit_transfer_signed(int &a, int &b)
> +{
> + b >>= 1;
> + b |= a & 0x80;
> + a >>= 1;
> + a &= 0x3f;
> + if (a & 0x20)
> + a -= 0x40;
> +}
> +
> +static uint32_t hash52(uint32_t p)
> +{
> + p ^= p >> 15;
> + p -= p << 17;
> + p += p << 7;
> + p += p << 4;
> + p ^= p >> 5;
> + p += p << 16;
> + p ^= p >> 7;
> + p ^= p >> 3;
> + p ^= p << 6;
> + p ^= p >> 17;
> + return p;
> +}
> +
> +static int select_partition(int seed, int x, int y, int z, int partitioncount,
> + int small_block)
> +{
> + if (small_block) {
> + x <<= 1;
> + y <<= 1;
> + z <<= 1;
> + }
> + seed += (partitioncount - 1) * 1024;
> + uint32_t rnum = hash52(seed);
> + uint8_t seed1 = rnum & 0xF;
> + uint8_t seed2 = (rnum >> 4) & 0xF;
> + uint8_t seed3 = (rnum >> 8) & 0xF;
> + uint8_t seed4 = (rnum >> 12) & 0xF;
> + uint8_t seed5 = (rnum >> 16) & 0xF;
> + uint8_t seed6 = (rnum >> 20) & 0xF;
> + uint8_t seed7 = (rnum >> 24) & 0xF;
> + uint8_t seed8 = (rnum >> 28) & 0xF;
> + uint8_t seed9 = (rnum >> 18) & 0xF;
> + uint8_t seed10 = (rnum >> 22) & 0xF;
> + uint8_t seed11 = (rnum >> 26) & 0xF;
> + uint8_t seed12 = ((rnum >> 30) | (rnum << 2)) & 0xF;
> +
> + seed1 *= seed1;
> + seed2 *= seed2;
> + seed3 *= seed3;
> + seed4 *= seed4;
> + seed5 *= seed5;
> + seed6 *= seed6;
> + seed7 *= seed7;
> + seed8 *= seed8;
> + seed9 *= seed9;
> + seed10 *= seed10;
> + seed11 *= seed11;
> + seed12 *= seed12;
> +
> + int sh1, sh2, sh3;
> + if (seed & 1) {
> + sh1 = (seed & 2 ? 4 : 5);
> + sh2 = (partitioncount == 3 ? 6 : 5);
> + } else {
> + sh1 = (partitioncount == 3 ? 6 : 5);
> + sh2 = (seed & 2 ? 4 : 5);
> + }
> + sh3 = (seed & 0x10) ? sh1 : sh2;
> +
> + seed1 >>= sh1;
> + seed2 >>= sh2;
> + seed3 >>= sh1;
> + seed4 >>= sh2;
> + seed5 >>= sh1;
> + seed6 >>= sh2;
> + seed7 >>= sh1;
> + seed8 >>= sh2;
> + seed9 >>= sh3;
> + seed10 >>= sh3;
> + seed11 >>= sh3;
> + seed12 >>= sh3;
> +
> + int a = seed1 * x + seed2 * y + seed11 * z + (rnum >> 14);
> + int b = seed3 * x + seed4 * y + seed12 * z + (rnum >> 10);
> + int c = seed5 * x + seed6 * y + seed9 * z + (rnum >> 6);
> + int d = seed7 * x + seed8 * y + seed10 * z + (rnum >> 2);
> +
> + a &= 0x3F;
> + b &= 0x3F;
> + c &= 0x3F;
> + d &= 0x3F;
> +
> + if (partitioncount < 4)
> + d = 0;
> + if (partitioncount < 3)
> + c = 0;
> +
> + if (a >= b && a >= c && a >= d)
> + return 0;
> + else if (b >= c && b >= d)
> + return 1;
> + else if (c >= d)
> + return 2;
> + else
> + return 3;
> +}
> +
> +
> +struct InputBitVector
> +{
> + uint32_t data[4];
> +
> + void printf_bits(int offset, int count, const char *fmt = "", ...)
> + {
> + char out[129];
> + memset(out, '.', 128);
> + out[128] = '\0';
> + int idx = offset;
> + for (int i = 0; i < count; ++i) {
> + out[127 - idx] = ((data[idx >> 5] >> (idx & 31)) & 1) ? '1' : '0';
> + ++idx;
> + }
> + printf("%s ", out);
> + va_list ap;
> + va_start(ap, fmt);
> + vprintf(fmt, ap);
> + va_end(ap);
> + printf("\n");
> + }
> +
> + uint32_t get_bits(int offset, int count)
> + {
> + assert(count >= 0 && count < 32);
> +
> + uint32_t out = 0;
> + if (offset < 32)
> + out |= data[0] >> offset;
> +
> + if (0 < offset && offset <= 32)
> + out |= data[1] << (32 - offset);
> + if (32 < offset && offset < 64)
> + out |= data[1] >> (offset - 32);
> +
> + if (32 < offset && offset <= 64)
> + out |= data[2] << (64 - offset);
> + if (64 < offset && offset < 96)
> + out |= data[2] >> (offset - 64);
> +
> + if (64 < offset && offset <= 96)
> + out |= data[3] << (96 - offset);
> + if (96 < offset && offset < 128)
> + out |= data[3] >> (offset - 96);
> +
> + out &= (1 << count) - 1;
> + return out;
> + }
> +
> + uint64_t get_bits64(int offset, int count)
> + {
> + assert(count >= 0 && count < 64);
> +
> + uint64_t out = 0;
> + if (offset < 32)
> + out |= data[0] >> offset;
> +
> + if (offset <= 32)
> + out |= (uint64_t)data[1] << (32 - offset);
> + if (32 < offset && offset < 64)
> + out |= data[1] >> (offset - 32);
> +
> + if (0 < offset && offset <= 64)
> + out |= (uint64_t)data[2] << (64 - offset);
> + if (64 < offset && offset < 96)
> + out |= data[2] >> (offset - 64);
> +
> + if (32 < offset && offset <= 96)
> + out |= (uint64_t)data[3] << (96 - offset);
> + if (96 < offset && offset < 128)
> + out |= data[3] >> (offset - 96);
> +
> + out &= ((uint64_t)1 << count) - 1;
> + return out;
> + }
> +
> + uint32_t get_bits_rev(int offset, int count)
> + {
> + assert(offset >= count);
> + uint32_t tmp = get_bits(offset - count, count);
> + uint32_t out = 0;
> + for (int i = 0; i < count; ++i)
> + out |= ((tmp >> i) & 1) << (count - 1 - i);
> + return out;
> + }
> +};
> +
> +struct OutputBitVector
> +{
> + uint32_t data[4];
> + int offset;
> +
> + OutputBitVector()
> + : offset(0)
> + {
> + memset(data, 0, sizeof(data));
> + }
> +
> + void append(uint32_t value, int size)
> + {
> + if (VERBOSE_WRITE)
> + printf("append offset=%d size=%d values=0x%x\n", offset, size, value);
> +
> + assert(offset + size <= 128);
> +
> + assert(size <= 32);
> + if (size < 32)
> + assert((value >> size) == 0);
> +
> + while (size) {
> + int c = MIN2(size, 32 - (offset & 31));
> + data[offset >> 5] |= (value << (offset & 31));
> + offset += c;
> + size -= c;
> + value >>= c;
> + }
> + }
> +
> + void append64(uint64_t value, int size)
> + {
> + if (VERBOSE_WRITE)
> + printf("append offset=%d size=%d values=0x%llx\n", offset, size, (unsigned long long)value);
> +
> + assert(offset + size <= 128);
> +
> + assert(size <= 64);
> + if (size < 64)
> + assert((value >> size) == 0);
> +
> + while (size) {
> + int c = MIN2(size, 32 - (offset & 31));
> + data[offset >> 5] |= (value << (offset & 31));
> + offset += c;
> + size -= c;
> + value >>= c;
> + }
> + }
> +
> + void append(OutputBitVector &v, int size)
> + {
> + if (VERBOSE_WRITE)
> + printf("append vector offset=%d size=%d\n", offset, size);
> +
> + assert(offset + size <= 128);
> + int i = 0;
> + while (size >= 32) {
> + append(v.data[i++], 32);
> + size -= 32;
> + }
> + if (size > 0)
> + append(v.data[i] & ((1 << size) - 1), size);
> + }
> +
> + void append_end(OutputBitVector &v, int size)
> + {
> + for (int i = 0; i < size; ++i)
> + data[(127 - i) >> 5] |= ((v.data[i >> 5] >> (i & 31)) & 1) << ((127 - i) & 31);
> + }
> +
> + /* Insert the given number of '1' bits. (We could use 0s instead, but 1s are
> + * more likely to flush out bugs where we accidentally read undefined bits.)
> + */
> + void skip(int size)
> + {
> + if (VERBOSE_WRITE)
> + printf("skip offset=%d size=%d\n", offset, size);
> +
> + assert(offset + size <= 128);
> + while (size >= 32) {
> + append(0xffffffff, 32);
> + size -= 32;
> + }
> + if (size > 0)
> + append(0xffffffff >> (32 - size), size);
> + }
> +};
> +
> +
> +class Decoder
> +{
> +public:
> + Decoder(int block_w, int block_h, int block_d, bool srgb, bool output_unorm8)
> + : block_w(block_w), block_h(block_h), block_d(block_d), srgb(srgb),
> + output_unorm8(output_unorm8) {}
> +
> + decode_error::type decode(const uint8_t *in, uint16_t *output) const;
> +
> + int block_w, block_h, block_d;
> + bool srgb, output_unorm8;
> +};
> +
> +struct Block
> +{
> + bool is_error;
> + bool bogus_colour_endpoints;
> + bool bogus_weights;
> +
> + int high_prec;
> + int dual_plane;
> + int colour_component_selector;
> + int wt_range;
> + int wt_w, wt_h, wt_d;
> + int num_parts;
> + int partition_index;
> +
> + bool is_void_extent;
> + int void_extent_d;
> + int void_extent_min_s;
> + int void_extent_max_s;
> + int void_extent_min_t;
> + int void_extent_max_t;
> + uint16_t void_extent_colour_r;
> + uint16_t void_extent_colour_g;
> + uint16_t void_extent_colour_b;
> + uint16_t void_extent_colour_a;
> +
> + bool is_multi_cem;
> + int num_extra_cem_bits;
> + int colour_endpoint_data_offset;
> + int extra_cem_bits;
> + int cem_base_class;
> + int cems[4];
> +
> + int num_cem_values;
> +
> + /* Calculated by unpack_weights(): */
> + uint8_t weights_quant[64 + 4]; /* max 64 values, plus padding for overflows in trit parsing */
> +
> + /* Calculated by unquantise_weights(): */
> + uint8_t weights[64 + 18]; /* max 64 values, plus padding for the infill interpolation */
> +
> + /* Calculated by unpack_colour_endpoints(): */
> + uint8_t colour_endpoints_quant[18 + 4]; /* max 18 values, plus padding for overflows in trit parsing */
> +
> + /* Calculated by unquantise_colour_endpoints(): */
> + uint8_t colour_endpoints[18];
> +
> + /* Calculated by calculate_from_weights(): */
> + int wt_trits;
> + int wt_quints;
> + int wt_bits;
> + int wt_max;
> + int num_weights;
> + int weight_bits;
> +
> + /* Calculated by calculate_remaining_bits(): */
> + int remaining_bits;
> +
> + /* Calculated by calculate_colour_endpoints_size(): */
> + int colour_endpoint_bits;
> + int ce_max;
> + int ce_trits;
> + int ce_quints;
> + int ce_bits;
> +
> + /* Calculated by compute_infill_weights(); */
> + uint8_t infill_weights[2][216]; /* large enough for 6x6x6 */
> +
> + /* Calculated by decode_colour_endpoints(); */
> + uint8x4_t endpoints_decoded[2][4];
> +
> + void calculate_from_weights();
> + void calculate_remaining_bits();
> + decode_error::type calculate_colour_endpoints_size();
> +
> + void unquantise_weights();
> + void unquantise_colour_endpoints();
> +
> + decode_error::type decode(const Decoder &decoder, InputBitVector in);
> +
> + decode_error::type decode_block_mode(InputBitVector in);
> + decode_error::type decode_void_extent(InputBitVector in);
> + void decode_cem(InputBitVector in);
> + void unpack_colour_endpoints(InputBitVector in);
> + void decode_colour_endpoints();
> + void unpack_weights(InputBitVector in);
> + void compute_infill_weights(int block_w, int block_h, int block_d);
> +
> + void write_decoded(const Decoder &decoder, uint16_t *output);
> +};
> +
> +
> +decode_error::type Decoder::decode(const uint8_t *in, uint16_t *output) const
> +{
> + Block blk;
> + InputBitVector in_vec;
> + memcpy(&in_vec.data, in, 16);
> + decode_error::type err = blk.decode(*this, in_vec);
> + if (err == decode_error::ok) {
> + blk.write_decoded(*this, output);
> + } else {
> + /* Fill output with the error colour */
> + for (int i = 0; i < block_w * block_h * block_d; ++i) {
> + if (output_unorm8) {
> + output[i*4+0] = 0xff;
> + output[i*4+1] = 0;
> + output[i*4+2] = 0xff;
> + output[i*4+3] = 0xff;
> + } else {
> + assert(!srgb); /* srgb must use unorm8 */
> +
> + output[i*4+0] = FP16_ONE;
> + output[i*4+1] = FP16_ZERO;
> + output[i*4+2] = FP16_ONE;
> + output[i*4+3] = FP16_ONE;
> + }
> + }
> + }
> + return err;
> +}
> +
> +
> +decode_error::type Block::decode_void_extent(InputBitVector block)
> +{
> + /* TODO: 3D */
> +
> + is_void_extent = true;
> + void_extent_d = block.get_bits(9, 1);
> + void_extent_min_s = block.get_bits(12, 13);
> + void_extent_max_s = block.get_bits(25, 13);
> + void_extent_min_t = block.get_bits(38, 13);
> + void_extent_max_t = block.get_bits(51, 13);
> + void_extent_colour_r = block.get_bits(64, 16);
> + void_extent_colour_g = block.get_bits(80, 16);
> + void_extent_colour_b = block.get_bits(96, 16);
> + void_extent_colour_a = block.get_bits(112, 16);
> +
> + /* TODO: maybe we should do something useful with the extent coordinates? */
> +
> + if (void_extent_d) {
> + return decode_error::unsupported_hdr_void_extent;
> + }
> +
> + if (void_extent_min_s == 0x1fff && void_extent_max_s == 0x1fff
> + && void_extent_min_t == 0x1fff && void_extent_max_t == 0x1fff) {
> +
> + /* No extents */
> +
> + } else {
> +
> + /* Check for illegal encoding */
> + if (void_extent_min_s >= void_extent_max_s || void_extent_min_t >= void_extent_max_t) {
> + return decode_error::invalid_range_in_void_extent;
> + }
> + }
> +
> + return decode_error::ok;
> +}
> +
> +decode_error::type Block::decode_block_mode(InputBitVector in)
> +{
> + dual_plane = in.get_bits(10, 1);
> + high_prec = in.get_bits(9, 1);
> +
> + if (in.get_bits(0, 2) != 0x0) {
> + wt_range = (in.get_bits(0, 2) << 1) | in.get_bits(4, 1);
> + int a = in.get_bits(5, 2);
> + int b = in.get_bits(7, 2);
> + switch (in.get_bits(2, 2)) {
> + case 0x0:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DHBBAAR00RR");
> + wt_w = b + 4;
> + wt_h = a + 2;
> + break;
> + case 0x1:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DHBBAAR01RR");
> + wt_w = b + 8;
> + wt_h = a + 2;
> + break;
> + case 0x2:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DHBBAAR10RR");
> + wt_w = a + 2;
> + wt_h = b + 8;
> + break;
> + case 0x3:
> + if ((b & 0x2) == 0) {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH0BAAR11RR");
> + wt_w = a + 2;
> + wt_h = b + 6;
> + } else {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH1BAAR11RR");
> + wt_w = (b & 0x1) + 2;
> + wt_h = a + 2;
> + }
> + break;
> + }
> + } else {
> + if (in.get_bits(6, 3) == 0x7) {
> + if (in.get_bits(0, 9) == 0x1fc) {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "xx111111100 (void extent)");
> + return decode_void_extent(in);
> + } else {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "xx111xxxx00");
> + return decode_error::reserved_block_mode_1;
> + }
> + }
> + if (in.get_bits(0, 4) == 0x0) {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "xxxxxxx0000");
> + return decode_error::reserved_block_mode_2;
> + }
> +
> + wt_range = in.get_bits(1, 3) | in.get_bits(4, 1);
> + int a = in.get_bits(5, 2);
> + int b;
> +
> + switch (in.get_bits(7, 2)) {
> + case 0b00:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH00AARRR00");
> + wt_w = 12;
> + wt_h = a + 2;
> + break;
> + case 0b01:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH01AARRR00");
> + wt_w = a + 2;
> + wt_h = 12;
> + break;
> + case 0b11:
> + if (in.get_bits(5, 1) == 0) {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH1100RRR00");
> + wt_w = 6;
> + wt_h = 10;
> + } else {
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "DH1101RRR00");
> + wt_w = 10;
> + wt_h = 6;
> + }
> + break;
> + case 0b10:
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 11, "BB10AARRR00");
> + b = in.get_bits(9, 2);
> + wt_w = a + 6;
> + wt_h = b + 6;
> + dual_plane = 0;
> + high_prec = 0;
> + break;
> + }
> + }
> + return decode_error::ok;
> +}
> +
> +void Block::decode_cem(InputBitVector in)
> +{
> + cems[0] = cems[1] = cems[2] = cems[3] = -1;
> +
> + num_extra_cem_bits = 0;
> + extra_cem_bits = 0;
> +
> + if (num_parts > 1) {
> +
> + partition_index = in.get_bits(13, 10);
> + if (VERBOSE_DECODE)
> + in.printf_bits(13, 10, "partition ID (%d)", partition_index);
> +
> + uint32_t cem = in.get_bits(23, 6);
> +
> + if ((cem & 0b11) == 0b00) {
> + cem >>= 2;
> + cem_base_class = cem >> 2;
> + is_multi_cem = false;
> +
> + for (int i = 0; i < num_parts; ++i)
> + cems[i] = cem;
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(23, 6, "CEM (single, %d)", cem);
> + } else {
> +
> + cem_base_class = (cem & 0b11) - 1;
> + is_multi_cem = true;
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(23, 6, "CEM (multi, base class %d)", cem_base_class);
> +
> + int offset = 128 - weight_bits;
> +
> + if (num_parts == 2) {
> + if (VERBOSE_DECODE) {
> + in.printf_bits(25, 4, "M0M0 C1 C0");
> + in.printf_bits(offset - 2, 2, "M1M1");
> + }
> +
> + uint32_t c0 = in.get_bits(25, 1);
> + uint32_t c1 = in.get_bits(26, 1);
> +
> + extra_cem_bits = c0 + c1;
> +
> + num_extra_cem_bits = 2;
> +
> + uint32_t m0 = in.get_bits(27, 2);
> + uint32_t m1 = in.get_bits(offset - 2, 2);
> +
> + cems[0] = ((cem_base_class + c0) << 2) | m0;
> + cems[1] = ((cem_base_class + c1) << 2) | m1;
> +
> + } else if (num_parts == 3) {
> + if (VERBOSE_DECODE) {
> + in.printf_bits(25, 4, "M0 C2 C1 C0");
> + in.printf_bits(offset - 5, 5, "M2M2 M1M1 M0");
> + }
> +
> + uint32_t c0 = in.get_bits(25, 1);
> + uint32_t c1 = in.get_bits(26, 1);
> + uint32_t c2 = in.get_bits(27, 1);
> +
> + extra_cem_bits = c0 + c1 + c2;
> +
> + num_extra_cem_bits = 5;
> +
> + uint32_t m0 = in.get_bits(28, 1) | (in.get_bits(128 - weight_bits - 5, 1) << 1);
> + uint32_t m1 = in.get_bits(offset - 4, 2);
> + uint32_t m2 = in.get_bits(offset - 2, 2);
> +
> + cems[0] = ((cem_base_class + c0) << 2) | m0;
> + cems[1] = ((cem_base_class + c1) << 2) | m1;
> + cems[2] = ((cem_base_class + c2) << 2) | m2;
> +
> + } else if (num_parts == 4) {
> + if (VERBOSE_DECODE) {
> + in.printf_bits(25, 4, "C3 C2 C1 C0");
> + in.printf_bits(offset - 8, 8, "M3M3 M2M2 M1M1 M0M0");
> + }
> +
> + uint32_t c0 = in.get_bits(25, 1);
> + uint32_t c1 = in.get_bits(26, 1);
> + uint32_t c2 = in.get_bits(27, 1);
> + uint32_t c3 = in.get_bits(28, 1);
> +
> + extra_cem_bits = c0 + c1 + c2 + c3;
> +
> + num_extra_cem_bits = 8;
> +
> + uint32_t m0 = in.get_bits(offset - 8, 2);
> + uint32_t m1 = in.get_bits(offset - 6, 2);
> + uint32_t m2 = in.get_bits(offset - 4, 2);
> + uint32_t m3 = in.get_bits(offset - 2, 2);
> +
> + cems[0] = ((cem_base_class + c0) << 2) | m0;
> + cems[1] = ((cem_base_class + c1) << 2) | m1;
> + cems[2] = ((cem_base_class + c2) << 2) | m2;
> + cems[3] = ((cem_base_class + c3) << 2) | m3;
> + } else {
> + unreachable("");
> + }
> + }
> +
> + colour_endpoint_data_offset = 29;
> +
> + } else {
> + uint32_t cem = in.get_bits(13, 4);
> +
> + cem_base_class = cem >> 2;
> + is_multi_cem = false;
> +
> + cems[0] = cem;
> +
> + partition_index = -1;
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(13, 4, "CEM = %d (class %d)", cem, cem_base_class);
> +
> + colour_endpoint_data_offset = 17;
> + }
> +}
> +
> +void Block::unpack_colour_endpoints(InputBitVector in)
> +{
> + if (ce_trits) {
> + int offset = colour_endpoint_data_offset;
> + int bits_left = colour_endpoint_bits;
> + for (int i = 0; i < num_cem_values; i += 5) {
> + int bits_to_read = MIN2(bits_left, 8 + ce_bits * 5);
> + /* If ce_trits then ce_bits <= 6, so bits_to_read <= 38 and we have to use uint64_t */
> + uint64_t raw = in.get_bits64(offset, bits_to_read);
> + unpack_trit_block(ce_bits, raw, &colour_endpoints_quant[i]);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset, bits_to_read,
> + "trits [%d,%d,%d,%d,%d]",
> + colour_endpoints_quant[i+0], colour_endpoints_quant[i+1],
> + colour_endpoints_quant[i+2], colour_endpoints_quant[i+3],
> + colour_endpoints_quant[i+4]);
> +
> + offset += 8 + ce_bits * 5;
> + bits_left -= 8 + ce_bits * 5;
> + }
> + } else if (ce_quints) {
> + int offset = colour_endpoint_data_offset;
> + int bits_left = colour_endpoint_bits;
> + for (int i = 0; i < num_cem_values; i += 3) {
> + int bits_to_read = MIN2(bits_left, 7 + ce_bits * 3);
> + /* If ce_quints then ce_bits <= 5, so bits_to_read <= 22 and we can use uint32_t */
> + uint32_t raw = in.get_bits(offset, bits_to_read);
> + unpack_quint_block(ce_bits, raw, &colour_endpoints_quant[i]);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset, bits_to_read,
> + "quints [%d,%d,%d]",
> + colour_endpoints_quant[i], colour_endpoints_quant[i+1], colour_endpoints_quant[i+2]);
> +
> + offset += 7 + ce_bits * 3;
> + bits_left -= 7 + ce_bits * 3;
> + }
> + } else {
> + assert((colour_endpoint_bits % ce_bits) == 0);
> + int offset = colour_endpoint_data_offset;
> + for (int i = 0; i < num_cem_values; i++) {
> + colour_endpoints_quant[i] = in.get_bits(offset, ce_bits);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset, ce_bits, "bits [%d]", colour_endpoints_quant[i]);
> +
> + offset += ce_bits;
> + }
> + }
> +}
> +
> +void Block::decode_colour_endpoints()
> +{
> + int cem_values_idx = 0;
> + for (int part = 0; part < num_parts; ++part) {
> + uint8_t *v = &colour_endpoints[cem_values_idx];
> + int v0 = v[0];
> + int v1 = v[1];
> + int v2 = v[2];
> + int v3 = v[3];
> + int v4 = v[4];
> + int v5 = v[5];
> + int v6 = v[6];
> + int v7 = v[7];
> + cem_values_idx += ((cems[part] >> 2) + 1) * 2;
> +
> + uint8x4_t e0, e1;
> + int s0, s1, L0, L1;
> +
> + switch (cems[part])
> + {
> + case 0:
> + e0 = uint8x4_t(v0, v0, v0, 0xff);
> + e1 = uint8x4_t(v1, v1, v1, 0xff);
> + break;
> + case 1:
> + L0 = (v0 >> 2) | (v1 & 0xc0);
> + L1 = L0 + (v1 & 0x3f);
> + if (L1 > 0xff)
> + L1 = 0xff;
> + e0 = uint8x4_t(L0, L0, L0, 0xff);
> + e1 = uint8x4_t(L1, L1, L1, 0xff);
> + break;
> + case 4:
> + e0 = uint8x4_t(v0, v0, v0, v2);
> + e1 = uint8x4_t(v1, v1, v1, v3);
> + break;
> + case 5:
> + bit_transfer_signed(v1, v0);
> + bit_transfer_signed(v3, v2);
> + e0 = uint8x4_t(v0, v0, v0, v2);
> + e1 = uint8x4_t::clamped(v0+v1, v0+v1, v0+v1, v2+v3);
> + break;
> + case 6:
> + e0 = uint8x4_t(v0*v3 >> 8, v1*v3 >> 8, v2*v3 >> 8, 0xff);
> + e1 = uint8x4_t(v0, v1, v2, 0xff);
> + break;
> + case 8:
> + s0 = v0 + v2 + v4;
> + s1 = v1 + v3 + v5;
> + if (s1 >= s0) {
> + e0 = uint8x4_t(v0, v2, v4, 0xff);
> + e1 = uint8x4_t(v1, v3, v5, 0xff);
> + } else {
> + e0 = blue_contract(v1, v3, v5, 0xff);
> + e1 = blue_contract(v0, v2, v4, 0xff);
> + }
> + break;
> + case 9:
> + bit_transfer_signed(v1, v0);
> + bit_transfer_signed(v3, v2);
> + bit_transfer_signed(v5, v4);
> + if (v1 + v3 + v5 >= 0) {
> + e0 = uint8x4_t(v0, v2, v4, 0xff);
> + e1 = uint8x4_t::clamped(v0+v1, v2+v3, v4+v5, 0xff);
> + } else {
> + e0 = blue_contract_clamped(v0+v1, v2+v3, v4+v5, 0xff);
> + e1 = blue_contract(v0, v2, v4, 0xff);
> + }
> + break;
> + case 10:
> + e0 = uint8x4_t(v0*v3 >> 8, v1*v3 >> 8, v2*v3 >> 8, v4);
> + e1 = uint8x4_t(v0, v1, v2, v5);
> + break;
> + case 12:
> + s0 = v0 + v2 + v4;
> + s1 = v1 + v3 + v5;
> + if (s1 >= s0) {
> + e0 = uint8x4_t(v0, v2, v4, v6);
> + e1 = uint8x4_t(v1, v3, v5, v7);
> + } else {
> + e0 = blue_contract(v1, v3, v5, v7);
> + e1 = blue_contract(v0, v2, v4, v6);
> + }
> + break;
> + case 13:
> + bit_transfer_signed(v1, v0);
> + bit_transfer_signed(v3, v2);
> + bit_transfer_signed(v5, v4);
> + bit_transfer_signed(v7, v6);
> + if (v1 + v3 + v5 >= 0) {
> + e0 = uint8x4_t(v0, v2, v4, v6);
> + e1 = uint8x4_t::clamped(v0+v1, v2+v3, v4+v5, v6+v7);
> + } else {
> + e0 = blue_contract_clamped(v0+v1, v2+v3, v4+v5, v6+v7);
> + e1 = blue_contract(v0, v2, v4, v6);
> + }
> + break;
> + default:
> + /* HDR endpoints not supported; return error colour */
> + e0 = uint8x4_t(255, 0, 255, 255);
> + e1 = uint8x4_t(255, 0, 255, 255);
> + break;
> + }
> +
> + endpoints_decoded[0][part] = e0;
> + endpoints_decoded[1][part] = e1;
> +
> + if (VERBOSE_DECODE) {
> + printf("cems[%d]=%d v=[", part, cems[part]);
> + for (int i = 0; i < (cems[part] >> 2) + 1; ++i) {
> + if (i)
> + printf(", ");
> + printf("%3d", v[i]);
> + }
> + printf("] e0=[%3d,%4d,%4d,%4d] e1=[%3d,%4d,%4d,%4d]\n",
> + e0.v[0], e0.v[1], e0.v[2], e0.v[3],
> + e1.v[0], e1.v[1], e1.v[2], e1.v[3]);
> + }
> + }
> +}
> +
> +void Block::unpack_weights(InputBitVector in)
> +{
> + if (wt_trits) {
> + int offset = 128;
> + int bits_left = weight_bits;
> + for (int i = 0; i < num_weights; i += 5) {
> + int bits_to_read = MIN2(bits_left, 8 + 5*wt_bits);
> + /* If wt_trits then wt_bits <= 3, so bits_to_read <= 23 and we can use uint32_t */
> + uint32_t raw = in.get_bits_rev(offset, bits_to_read);
> + unpack_trit_block(wt_bits, raw, &weights_quant[i]);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset - bits_to_read, bits_to_read, "weight trits [%d,%d,%d,%d,%d]",
> + weights_quant[i+0], weights_quant[i+1],
> + weights_quant[i+2], weights_quant[i+3],
> + weights_quant[i+4]);
> +
> + offset -= 8 + wt_bits * 5;
> + bits_left -= 8 + wt_bits * 5;
> + }
> +
> + } else if (wt_quints) {
> +
> + int offset = 128;
> + int bits_left = weight_bits;
> + for (int i = 0; i < num_weights; i += 3) {
> + int bits_to_read = MIN2(bits_left, 7 + 3*wt_bits);
> + /* If wt_quints then wt_bits <= 2, so bits_to_read <= 13 and we can use uint32_t */
> + uint32_t raw = in.get_bits_rev(offset, bits_to_read);
> + unpack_quint_block(wt_bits, raw, &weights_quant[i]);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset - bits_to_read, bits_to_read, "weight quints [%d,%d,%d]",
> + weights_quant[i], weights_quant[i+1], weights_quant[i+2]);
> +
> + offset -= 7 + wt_bits * 3;
> + bits_left -= 7 + wt_bits * 3;
> + }
> +
> + } else {
> + int offset = 128;
> + assert((weight_bits % wt_bits) == 0);
> + for (int i = 0; i < num_weights; ++i) {
> + weights_quant[i] = in.get_bits_rev(offset, wt_bits);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(offset - wt_bits, wt_bits, "weight bits [%d]", weights_quant[i]);
> +
> + offset -= wt_bits;
> + }
> + }
> +}
> +
> +void Block::unquantise_weights()
> +{
> + assert(num_weights <= (int)ARRAY_SIZE(weights_quant));
> + assert(num_weights <= (int)ARRAY_SIZE(weights));
> +
> + memset(weights, 0, sizeof(weights));
> +
> + for (int i = 0; i < num_weights; ++i) {
> +
> + uint8_t v = weights_quant[i];
> + uint8_t w;
> +
> + if (wt_trits) {
> +
> + if (wt_bits == 0) {
> + w = v * 32;
> + } else {
> + uint8_t A, B, C, D;
> + A = (v & 0b1) ? 0b1111111 : 0b0000000;
> + switch (wt_bits) {
> + case 1:
> + B = 0;
> + C = 50;
> + D = v >> 1;
> + break;
> + case 2:
> + B = (v & 0b10) ? 0b1000101 : 0b0000000;
> + C = 23;
> + D = v >> 2;
> + break;
> + case 3:
> + B = ((v & 0b110) >> 1) | ((v & 0b110) << 4);
> + C = 11;
> + D = v >> 3;
> + break;
> + default:
> + unreachable("");
> + }
> + uint16_t T = D * C + B;
> + T = T ^ A;
> + T = (A & 0x20) | (T >> 2);
> + assert(T < 64);
> + if (T > 32)
> + T++;
> + w = T;
> + }
> +
> + } else if (wt_quints) {
> +
> + if (wt_bits == 0) {
> + w = v * 16;
> + } else {
> + uint8_t A, B, C, D;
> + A = (v & 0b1) ? 0b1111111 : 0b0000000;
> + switch (wt_bits) {
> + case 1:
> + B = 0;
> + C = 28;
> + D = v >> 1;
> + break;
> + case 2:
> + B = (v & 0b10) ? 0b1000010 : 0b0000000;
> + C = 13;
> + D = v >> 2;
> + break;
> + default:
> + unreachable("");
> + }
> + uint16_t T = D * C + B;
> + T = T ^ A;
> + T = (A & 0x20) | (T >> 2);
> + assert(T < 64);
> + if (T > 32)
> + T++;
> + w = T;
> + }
> + weights[i] = w;
> +
> + } else {
> +
> + switch (wt_bits) {
> + case 1: w = v ? 0b111111 : 0b000000; break;
> + case 2: w = v | (v << 2) | (v << 4); break;
> + case 3: w = v | (v << 3); break;
> + case 4: w = (v >> 2) | (v << 2); break;
> + case 5: w = (v >> 4) | (v << 1); break;
> + default: unreachable("");
> + }
> + assert(w < 64);
> + if (w > 32)
> + w++;
> + }
> + weights[i] = w;
> + }
> +}
> +
> +void Block::compute_infill_weights(int block_w, int block_h, int block_d)
> +{
> + int Ds = block_w <= 1 ? 0 : (1024 + block_w / 2) / (block_w - 1);
> + int Dt = block_h <= 1 ? 0 : (1024 + block_h / 2) / (block_h - 1);
> + int Dr = block_d <= 1 ? 0 : (1024 + block_d / 2) / (block_d - 1);
> + for (int r = 0; r < block_d; ++r) {
> + for (int t = 0; t < block_h; ++t) {
> + for (int s = 0; s < block_w; ++s) {
> + int cs = Ds * s;
> + int ct = Dt * t;
> + int cr = Dr * r;
> + int gs = (cs * (wt_w - 1) + 32) >> 6;
> + int gt = (ct * (wt_h - 1) + 32) >> 6;
> + int gr = (cr * (wt_d - 1) + 32) >> 6;
> + assert(gs >= 0 && gs <= 176);
> + assert(gt >= 0 && gt <= 176);
> + assert(gr >= 0 && gr <= 176);
> + int js = gs >> 4;
> + int fs = gs & 0xf;
> + int jt = gt >> 4;
> + int ft = gt & 0xf;
> + int jr = gr >> 4;
> + int fr = gr & 0xf;
> +
> + /* TODO: 3D */
> + (void)jr;
> + (void)fr;
> +
> + int w11 = (fs * ft + 8) >> 4;
> + int w10 = ft - w11;
> + int w01 = fs - w11;
> + int w00 = 16 - fs - ft + w11;
> +
> + if (dual_plane) {
> + int p00, p01, p10, p11, i0, i1;
> + int v0 = js + jt * wt_w;
> + p00 = weights[(v0) * 2];
> + p01 = weights[(v0 + 1) * 2];
> + p10 = weights[(v0 + wt_w) * 2];
> + p11 = weights[(v0 + wt_w + 1) * 2];
> + i0 = (p00*w00 + p01*w01 + p10*w10 + p11*w11 + 8) >> 4;
> + p00 = weights[(v0) * 2 + 1];
> + p01 = weights[(v0 + 1) * 2 + 1];
> + p10 = weights[(v0 + wt_w) * 2 + 1];
> + p11 = weights[(v0 + wt_w + 1) * 2 + 1];
> + assert((v0 + wt_w + 1) * 2 + 1 < (int)ARRAY_SIZE(weights));
> + i1 = (p00*w00 + p01*w01 + p10*w10 + p11*w11 + 8) >> 4;
> + assert(0 <= i0 && i0 <= 64);
> + infill_weights[0][s + t*block_w + r*block_w*block_h] = i0;
> + infill_weights[1][s + t*block_w + r*block_w*block_h] = i1;
> + } else {
> + int p00, p01, p10, p11, i;
> + int v0 = js + jt * wt_w;
> + p00 = weights[v0];
> + p01 = weights[v0 + 1];
> + p10 = weights[v0 + wt_w];
> + p11 = weights[v0 + wt_w + 1];
> + assert(v0 + wt_w + 1 < (int)ARRAY_SIZE(weights));
> + i = (p00*w00 + p01*w01 + p10*w10 + p11*w11 + 8) >> 4;
> + assert(0 <= i && i <= 64);
> + infill_weights[0][s + t*block_w + r*block_w*block_h] = i;
> + }
> + }
> + }
> + }
> +}
> +
> +void Block::unquantise_colour_endpoints()
> +{
> + assert(num_cem_values <= (int)ARRAY_SIZE(colour_endpoints_quant));
> + assert(num_cem_values <= (int)ARRAY_SIZE(colour_endpoints));
> +
> + for (int i = 0; i < num_cem_values; ++i) {
> + uint8_t v = colour_endpoints_quant[i];
> +
> + if (ce_trits) {
> + uint16_t A, B, C, D;
> + uint16_t t;
> + A = (v & 0b1) ? 0b111111111 : 0b000000000;
> + switch (ce_bits) {
> + case 1:
> + B = 0;
> + C = 204;
> + D = v >> 1;
> + break;
> + case 2:
> + B = (v & 0b10) ? 0b100010110 : 0b000000000;
> + C = 93;
> + D = v >> 2;
> + break;
> + case 3:
> + t = ((v >> 1) & 0b11);
> + B = t | (t << 2) | (t << 7);
> + C = 44;
> + D = v >> 3;
> + break;
> + case 4:
> + t = ((v >> 1) & 0b111);
> + B = t | (t << 6);
> + C = 22;
> + D = v >> 4;
> + break;
> + case 5:
> + t = ((v >> 1) & 0b1111);
> + B = (t >> 2) | (t << 5);
> + C = 11;
> + D = v >> 5;
> + break;
> + case 6:
> + B = ((v & 0b111110) << 3) | ((v >> 5) & 0b1);
> + C = 5;
> + D = v >> 6;
> + break;
> + default:
> + unreachable("");
> + }
> + uint16_t T = D * C + B;
> + T = T ^ A;
> + T = (A & 0x80) | (T >> 2);
> + assert(T < 256);
> + colour_endpoints[i] = T;
> + } else if (ce_quints) {
> + uint16_t A, B, C, D;
> + uint16_t t;
> + A = (v & 0b1) ? 0b111111111 : 0b000000000;
> + switch (ce_bits) {
> + case 1:
> + B = 0;
> + C = 113;
> + D = v >> 1;
> + break;
> + case 2:
> + B = (v & 0b10) ? 0b100001100 : 0b000000000;
> + C = 54;
> + D = v >> 2;
> + break;
> + case 3:
> + t = ((v >> 1) & 0b11);
> + B = (t >> 1) | (t << 1) | (t << 7);
> + C = 26;
> + D = v >> 3;
> + break;
> + case 4:
> + t = ((v >> 1) & 0b111);
> + B = (t >> 1) | (t << 6);
> + C = 13;
> + D = v >> 4;
> + break;
> + case 5:
> + t = ((v >> 1) & 0b1111);
> + B = (t >> 4) | (t << 5);
> + C = 6;
> + D = v >> 5;
> + break;
> + default:
> + unreachable("");
> + }
> + uint16_t T = D * C + B;
> + T = T ^ A;
> + T = (A & 0x80) | (T >> 2);
> + assert(T < 256);
> + colour_endpoints[i] = T;
> + } else {
> + switch (ce_bits) {
> + case 1: v = v ? 0b11111111 : 0b00000000; break;
> + case 2: v = (v << 6) | (v << 4) | (v << 2) | v; break;
> + case 3: v = (v << 5) | (v << 2) | (v >> 1); break;
> + case 4: v = (v << 4) | v; break;
> + case 5: v = (v << 3) | (v >> 2); break;
> + case 6: v = (v << 2) | (v >> 4); break;
> + case 7: v = (v << 1) | (v >> 6); break;
> + case 8: break;
> + default: unreachable("");
> + }
> + colour_endpoints[i] = v;
> + }
> + }
> +}
> +
> +decode_error::type Block::decode(const Decoder &decoder, InputBitVector in)
> +{
> + decode_error::type err;
> +
> + is_error = false;
> + bogus_colour_endpoints = false;
> + bogus_weights = false;
> + is_void_extent = false;
> +
> + wt_d = 1;
> + /* TODO: 3D */
> +
> + /* TODO: test for all the illegal encodings */
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(0, 128);
> +
> + err = decode_block_mode(in);
> + if (err != decode_error::ok)
> + return err;
> +
> + if (is_void_extent)
> + return decode_error::ok;
> +
> + /* TODO: 3D */
> +
> + calculate_from_weights();
> +
> + if (VERBOSE_DECODE)
> + printf("weights_grid=%dx%dx%d dual_plane=%d num_weights=%d high_prec=%d r=%d range=0..%d (%dt %dq %db) weight_bits=%d\n",
> + wt_w, wt_h, wt_d, dual_plane, num_weights, high_prec, wt_range, wt_max, wt_trits, wt_quints, wt_bits, weight_bits);
> +
> + if (wt_w > decoder.block_w || wt_h > decoder.block_h || wt_d > decoder.block_d)
> + return decode_error::weight_grid_exceeds_block_size;
> +
> + num_parts = in.get_bits(11, 2) + 1;
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(11, 2, "partitions = %d", num_parts);
> +
> + if (dual_plane && num_parts > 3)
> + return decode_error::dual_plane_and_too_many_partitions;
> +
> + decode_cem(in);
> +
> + if (VERBOSE_DECODE)
> + printf("cem=[%d,%d,%d,%d] base_cem_class=%d\n", cems[0], cems[1], cems[2], cems[3], cem_base_class);
> +
> + int num_cem_pairs = (cem_base_class + 1) * num_parts + extra_cem_bits;
> + num_cem_values = num_cem_pairs * 2;
> +
> + calculate_remaining_bits();
> + err = calculate_colour_endpoints_size();
> + if (err != decode_error::ok)
> + return err;
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(colour_endpoint_data_offset, colour_endpoint_bits,
> + "endpoint data (%d bits, %d vals, %dt %dq %db)",
> + colour_endpoint_bits, num_cem_values, ce_trits, ce_quints, ce_bits);
> +
> + unpack_colour_endpoints(in);
> +
> + if (VERBOSE_DECODE) {
> + printf("cem values raw =[");
> + for (int i = 0; i < num_cem_values; i++) {
> + if (i)
> + printf(", ");
> + printf("%3d", colour_endpoints_quant[i]);
> + }
> + printf("]\n");
> + }
> +
> + if (num_cem_values > 18)
> + return decode_error::invalid_colour_endpoints_count;
> +
> + unquantise_colour_endpoints();
> +
> + if (VERBOSE_DECODE) {
> + printf("cem values norm=[");
> + for (int i = 0; i < num_cem_values; i++) {
> + if (i)
> + printf(", ");
> + printf("%3d", colour_endpoints[i]);
> + }
> + printf("]\n");
> + }
> +
> + decode_colour_endpoints();
> +
> + if (dual_plane) {
> + int ccs_offset = 128 - weight_bits - num_extra_cem_bits - 2;
> + colour_component_selector = in.get_bits(ccs_offset, 2);
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(ccs_offset, 2, "colour component selector = %d", colour_component_selector);
> + } else {
> + colour_component_selector = 0;
> + }
> +
> +
> + if (VERBOSE_DECODE)
> + in.printf_bits(128 - weight_bits, weight_bits, "weights (%d bits)", weight_bits);
> +
> + if (num_weights > 64)
> + return decode_error::invalid_num_weights;
> +
> + if (weight_bits < 24 || weight_bits > 96)
> + return decode_error::invalid_weight_bits;
> +
> + unpack_weights(in);
> +
> + unquantise_weights();
> +
> + if (VERBOSE_DECODE) {
> + printf("weights=[");
> + for (int i = 0; i < num_weights; ++i) {
> + if (i)
> + printf(", ");
> + printf("%d", weights[i]);
> + }
> + printf("]\n");
> +
> + for (int plane = 0; plane <= dual_plane; ++plane) {
> + printf("weights (plane %d):\n", plane);
> + int i = 0;
> + (void)i;
> +
> + for (int r = 0; r < wt_d; ++r) {
> + for (int t = 0; t < wt_h; ++t) {
> + for (int s = 0; s < wt_w; ++s) {
> + printf("%3d", weights[i++ * (1 + dual_plane) + plane]);
> + }
> + printf("\n");
> + }
> + if (r < wt_d - 1)
> + printf("\n");
> + }
> + }
> + }
> +
> + compute_infill_weights(decoder.block_w, decoder.block_h, decoder.block_d);
> +
> + if (VERBOSE_DECODE) {
> + for (int plane = 0; plane <= dual_plane; ++plane) {
> + printf("infilled weights (plane %d):\n", plane);
> + int i = 0;
> + (void)i;
> +
> + for (int r = 0; r < decoder.block_d; ++r) {
> + for (int t = 0; t < decoder.block_h; ++t) {
> + for (int s = 0; s < decoder.block_w; ++s) {
> + printf("%3d", infill_weights[plane][i++]);
> + }
> + printf("\n");
> + }
> + if (r < decoder.block_d - 1)
> + printf("\n");
> + }
> + }
> + }
> + if (VERBOSE_DECODE)
> + printf("\n");
> +
> + return decode_error::ok;
> +}
> +
> +void Block::write_decoded(const Decoder &decoder, uint16_t *output)
> +{
> + /* sRGB can only be stored as unorm8. */
> + assert(!decoder.srgb || decoder.output_unorm8);
> +
> + if (is_void_extent) {
> + for (int idx = 0; idx < decoder.block_w*decoder.block_h*decoder.block_d; ++idx) {
> + if (decoder.output_unorm8) {
> + if (decoder.srgb) {
> + output[idx*4+0] = void_extent_colour_r >> 8;
> + output[idx*4+1] = void_extent_colour_g >> 8;
> + output[idx*4+2] = void_extent_colour_b >> 8;
> + } else {
> + output[idx*4+0] = uint16_div_64k_to_half_to_unorm8(void_extent_colour_r);
> + output[idx*4+1] = uint16_div_64k_to_half_to_unorm8(void_extent_colour_g);
> + output[idx*4+2] = uint16_div_64k_to_half_to_unorm8(void_extent_colour_b);
> + }
> + output[idx*4+3] = uint16_div_64k_to_half_to_unorm8(void_extent_colour_a);
> + } else {
> + /* Store the color as FP16. */
> + output[idx*4+0] = _mesa_uint16_div_64k_to_half(void_extent_colour_r);
> + output[idx*4+1] = _mesa_uint16_div_64k_to_half(void_extent_colour_g);
> + output[idx*4+2] = _mesa_uint16_div_64k_to_half(void_extent_colour_b);
> + output[idx*4+3] = _mesa_uint16_div_64k_to_half(void_extent_colour_a);
> + }
> + }
> + return;
> + }
> +
> + int small_block = (decoder.block_w * decoder.block_h * decoder.block_d) < 31;
> +
> + int idx = 0;
> + for (int z = 0; z < decoder.block_d; ++z) {
> + for (int y = 0; y < decoder.block_h; ++y) {
> + for (int x = 0; x < decoder.block_w; ++x) {
> +
> + int partition;
> + if (num_parts > 1) {
> + partition = select_partition(partition_index, x, y, z, num_parts, small_block);
> + assert(partition < num_parts);
> + } else {
> + partition = 0;
> + }
> +
> + /* TODO: HDR */
> +
> + uint8x4_t e0 = endpoints_decoded[0][partition];
> + uint8x4_t e1 = endpoints_decoded[1][partition];
> + uint16_t c0[4], c1[4];
> +
> + /* Expand to 16 bits. */
> + if (decoder.srgb) {
> + c0[0] = (uint16_t)((e0.v[0] << 8) | 0x80);
> + c0[1] = (uint16_t)((e0.v[1] << 8) | 0x80);
> + c0[2] = (uint16_t)((e0.v[2] << 8) | 0x80);
> + c0[3] = (uint16_t)((e0.v[3] << 8) | 0x80);
> +
> + c1[0] = (uint16_t)((e1.v[0] << 8) | 0x80);
> + c1[1] = (uint16_t)((e1.v[1] << 8) | 0x80);
> + c1[2] = (uint16_t)((e1.v[2] << 8) | 0x80);
> + c1[3] = (uint16_t)((e1.v[3] << 8) | 0x80);
> + } else {
> + c0[0] = (uint16_t)((e0.v[0] << 8) | e0.v[0]);
> + c0[1] = (uint16_t)((e0.v[1] << 8) | e0.v[1]);
> + c0[2] = (uint16_t)((e0.v[2] << 8) | e0.v[2]);
> + c0[3] = (uint16_t)((e0.v[3] << 8) | e0.v[3]);
> +
> + c1[0] = (uint16_t)((e1.v[0] << 8) | e1.v[0]);
> + c1[1] = (uint16_t)((e1.v[1] << 8) | e1.v[1]);
> + c1[2] = (uint16_t)((e1.v[2] << 8) | e1.v[2]);
> + c1[3] = (uint16_t)((e1.v[3] << 8) | e1.v[3]);
> + }
> +
> + int w[4];
> + if (dual_plane) {
> + int w0 = infill_weights[0][idx];
> + int w1 = infill_weights[1][idx];
> + w[0] = w[1] = w[2] = w[3] = w0;
> + w[colour_component_selector] = w1;
> + } else {
> + int w0 = infill_weights[0][idx];
> + w[0] = w[1] = w[2] = w[3] = w0;
> + }
> +
> + /* Interpolate to produce UNORM16, applying weights. */
> + uint16_t c[4] = {
> + (uint16_t)((c0[0] * (64 - w[0]) + c1[0] * w[0] + 32) >> 6),
> + (uint16_t)((c0[1] * (64 - w[1]) + c1[1] * w[1] + 32) >> 6),
> + (uint16_t)((c0[2] * (64 - w[2]) + c1[2] * w[2] + 32) >> 6),
> + (uint16_t)((c0[3] * (64 - w[3]) + c1[3] * w[3] + 32) >> 6),
> + };
> +
> + if (decoder.output_unorm8) {
> + if (decoder.srgb) {
> + output[idx*4+0] = c[0] >> 8;
> + output[idx*4+1] = c[1] >> 8;
> + output[idx*4+2] = c[2] >> 8;
> + } else {
> + output[idx*4+0] = c[0] == 65535 ? 0xff : uint16_div_64k_to_half_to_unorm8(c[0]);
> + output[idx*4+1] = c[1] == 65535 ? 0xff : uint16_div_64k_to_half_to_unorm8(c[1]);
> + output[idx*4+2] = c[2] == 65535 ? 0xff : uint16_div_64k_to_half_to_unorm8(c[2]);
> + }
> + output[idx*4+3] = c[3] == 65535 ? 0xff : uint16_div_64k_to_half_to_unorm8(c[3]);
> + } else {
> + /* Store the color as FP16. */
> + output[idx*4+0] = c[0] == 65535 ? FP16_ONE : _mesa_uint16_div_64k_to_half(c[0]);
> + output[idx*4+1] = c[1] == 65535 ? FP16_ONE : _mesa_uint16_div_64k_to_half(c[1]);
> + output[idx*4+2] = c[2] == 65535 ? FP16_ONE : _mesa_uint16_div_64k_to_half(c[2]);
> + output[idx*4+3] = c[3] == 65535 ? FP16_ONE : _mesa_uint16_div_64k_to_half(c[3]);
> + }
> +
> + idx++;
> + }
> + }
> + }
> +}
> +
> +void Block::calculate_from_weights()
> +{
> + wt_trits = 0;
> + wt_quints = 0;
> + wt_bits = 0;
> + switch (high_prec) {
> + case 0:
> + switch (wt_range) {
> + case 0x2: wt_max = 1; wt_bits = 1; break;
> + case 0x3: wt_max = 2; wt_trits = 1; break;
> + case 0x4: wt_max = 3; wt_bits = 2; break;
> + case 0x5: wt_max = 4; wt_quints = 1; break;
> + case 0x6: wt_max = 5; wt_trits = 1; wt_bits = 1; break;
> + case 0x7: wt_max = 7; wt_bits = 3; break;
> + default: abort();
> + }
> + break;
> + case 1:
> + switch (wt_range) {
> + case 0x2: wt_max = 9; wt_quints = 1; wt_bits = 1; break;
> + case 0x3: wt_max = 11; wt_trits = 1; wt_bits = 2; break;
> + case 0x4: wt_max = 15; wt_bits = 4; break;
> + case 0x5: wt_max = 19; wt_quints = 1; wt_bits = 2; break;
> + case 0x6: wt_max = 23; wt_trits = 1; wt_bits = 3; break;
> + case 0x7: wt_max = 31; wt_bits = 5; break;
> + default: abort();
> + }
> + break;
> + }
> +
> + assert(wt_trits || wt_quints || wt_bits);
> +
> + num_weights = wt_w * wt_h * wt_d;
> +
> + if (dual_plane)
> + num_weights *= 2;
> +
> + weight_bits =
> + (num_weights * 8 * wt_trits + 4) / 5
> + + (num_weights * 7 * wt_quints + 2) / 3
> + + num_weights * wt_bits;
> +}
> +
> +void Block::calculate_remaining_bits()
> +{
> + int config_bits;
> + if (num_parts > 1) {
> + if (!is_multi_cem)
> + config_bits = 29;
> + else
> + config_bits = 25 + 3 * num_parts;
> + } else {
> + config_bits = 17;
> + }
> +
> + if (dual_plane)
> + config_bits += 2;
> +
> + remaining_bits = 128 - config_bits - weight_bits;
> +}
> +
> +decode_error::type Block::calculate_colour_endpoints_size()
> +{
> + /* Specified as illegal */
> + if (remaining_bits < (13 * num_cem_values + 4) / 5) {
> + colour_endpoint_bits = ce_max = ce_trits = ce_quints = ce_bits = 0;
> + return decode_error::invalid_colour_endpoints_size;
> + }
> +
> + /* Find the largest cem_ranges that fits within remaining_bits */
> + for (int i = ARRAY_SIZE(cem_ranges)-1; i >= 0; --i) {
> + int cem_bits;
> + cem_bits = (num_cem_values * 8 * cem_ranges[i].t + 4) / 5
> + + (num_cem_values * 7 * cem_ranges[i].q + 2) / 3
> + + num_cem_values * cem_ranges[i].b;
> +
> + if (cem_bits <= remaining_bits)
> + {
> + colour_endpoint_bits = cem_bits;
> + ce_max = cem_ranges[i].max;
> + ce_trits = cem_ranges[i].t;
> + ce_quints = cem_ranges[i].q;
> + ce_bits = cem_ranges[i].b;
> + return decode_error::ok;
> + }
> + }
> +
> + assert(0);
> + return decode_error::invalid_colour_endpoints_size;
> +}
> +
> +/**
> + * Decode ASTC 2D LDR texture data.
> + *
> + * \param src_width in pixels
> + * \param src_height in pixels
> + * \param dst_stride in bytes
> + */
> +extern "C" void
> +_mesa_unpack_astc_2d_ldr(uint8_t *dst_row,
> + unsigned dst_stride,
> + const uint8_t *src_row,
> + unsigned src_stride,
> + unsigned src_width,
> + unsigned src_height,
> + mesa_format format)
> +{
> + assert(_mesa_is_format_astc_2d(format));
> + bool srgb = _mesa_get_format_color_encoding(format) == GL_SRGB;
> +
> + unsigned blk_w, blk_h;
> + _mesa_get_format_block_size(format, &blk_w, &blk_h);
> +
> + const unsigned block_size = 16;
> + unsigned x_blocks = (src_width + blk_w - 1) / blk_w;
> + unsigned y_blocks = (src_height + blk_h - 1) / blk_h;
> +
> + Decoder dec(blk_w, blk_h, 1, srgb, true);
> +
> + for (unsigned y = 0; y < y_blocks; ++y) {
> + for (unsigned x = 0; x < x_blocks; ++x) {
> + /* Same size as the largest block. */
> + uint16_t block_out[12 * 12 * 4];
> +
> + dec.decode(src_row + x * block_size, block_out);
> +
> + /* This can be smaller with NPOT dimensions. */
> + unsigned dst_blk_w = MIN2(blk_w, src_width - x*blk_w);
> + unsigned dst_blk_h = MIN2(blk_h, src_height - y*blk_h);
> +
> + for (unsigned sub_y = 0; sub_y < dst_blk_h; ++sub_y) {
> + for (unsigned sub_x = 0; sub_x < dst_blk_w; ++sub_x) {
> + uint8_t *dst = dst_row + sub_y * dst_stride +
> + (x * blk_w + sub_x) * 4;
> + const uint16_t *src = &block_out[(sub_y * blk_w + sub_x) * 4];
> +
> + dst[0] = src[0];
> + dst[1] = src[1];
> + dst[2] = src[2];
> + dst[3] = src[3];
> + }
> + }
> + }
> + src_row += src_stride;
> + dst_row += dst_stride * blk_h;
> + }
> +}
> diff --git a/src/mesa/main/texcompress_astc.h b/src/mesa/main/texcompress_astc.h
> new file mode 100644
> index 00000000000..9f9c5281dda
> --- /dev/null
> +++ b/src/mesa/main/texcompress_astc.h
> @@ -0,0 +1,47 @@
> +/*
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + */
> +
> +#ifndef TEXCOMPRESS_ASTC_H
> +#define TEXCOMPRESS_ASTC_H
> +
> +#include <inttypes.h>
> +#include "texcompress.h"
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +void
> +_mesa_unpack_astc_2d_ldr(uint8_t *dst_row,
> + unsigned dst_stride,
> + const uint8_t *src_row,
> + unsigned src_stride,
> + unsigned src_width,
> + unsigned src_height,
> + mesa_format format);
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/src/util/half_float.c b/src/util/half_float.c
> index 4df64c2ccf9..588f050d924 100644
> --- a/src/util/half_float.c
> +++ b/src/util/half_float.c
> @@ -1,14 +1,16 @@
> /*
> * Mesa 3-D graphics library
> *
> * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
> + * Copyright 2015 Philip Taylor <philip at zaynar.co.uk>
> + * Copyright 2018 Advanced Micro Devices, Inc.
> *
> * Permission is hereby granted, free of charge, to any person obtaining a
> * copy of this software and associated documentation files (the "Software"),
> * to deal in the Software without restriction, including without limitation
> * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> * and/or sell copies of the Software, and to permit persons to whom the
> * Software is furnished to do so, subject to the following conditions:
> *
> * The above copyright notice and this permission notice shall be included
> * in all copies or substantial portions of the Software.
> @@ -168,10 +170,67 @@ _mesa_half_to_float(uint16_t val)
> else {
> /* regular */
> flt_e = e + 112;
> flt_m = m << 13;
> }
>
> fi.i = (flt_s << 31) | (flt_e << 23) | flt_m;
> result = fi.f;
> return result;
> }
> +
> +/**
> + * Convert 0.0 to 0x00, 1.0 to 0xff.
> + * Values outside the range [0.0, 1.0] will give undefined results.
> + */
> +uint8_t _mesa_half_to_unorm8(uint16_t val)
> +{
> + const int m = val & 0x3ff;
> + const int e = (val >> 10) & 0x1f;
> + const int s = (val >> 15) & 0x1;
> +
> + /* v = round_to_nearest(1.mmmmmmmmmm * 2^(e-15) * 255)
> + * = round_to_nearest((1.mmmmmmmmmm * 255) * 2^(e-15))
> + * = round_to_nearest((1mmmmmmmmmm * 255) * 2^(e-25))
> + * = round_to_zero((1mmmmmmmmmm * 255) * 2^(e-25) + 0.5)
> + * = round_to_zero(((1mmmmmmmmmm * 255) * 2^(e-24) + 1) / 2)
> + *
> + * This happens to give the correct answer for zero/subnormals too
> + */
> + assert(s == 0 && val <= FP16_ONE); /* check 0 <= this <= 1 */
> + /* (implies e <= 15, which means the bit-shifts below are safe) */
> +
> + uint32_t v = ((1 << 10) | m) * 255;
> + v = ((v >> (24 - e)) + 1) >> 1;
> + return v;
> +}
> +
> +/**
> + * Takes a uint16_t, divides by 65536, converts the infinite-precision
> + * result to fp16 with round-to-zero. Used by the ASTC decoder.
> + */
> +uint16_t _mesa_uint16_div_64k_to_half(uint16_t v)
> +{
> + /* Zero or subnormal. Set the mantissa to (v << 8) and return. */
> + if (v < 4)
> + return v << 8;
> +
> + /* Count the leading 0s in the uint16_t */
> + int n = __builtin_clz(v) - (sizeof(unsigned int) - sizeof(uint16_t)) * 8;
> +
> + /* Shift the mantissa up so bit 16 is the hidden 1 bit,
> + * mask it off, then shift back down to 10 bits
> + */
> + int m = ( ((uint32_t)v << (n + 1)) & 0xffff ) >> 6;
> +
> + /* (0{n} 1 X{15-n}) * 2^-16
> + * = 1.X * 2^(15-n-16)
> + * = 1.X * 2^(14-n - 15)
> + * which is the FP16 form with e = 14 - n
> + */
> + int e = 14 - n;
> +
> + assert(e >= 1 && e <= 30);
> + assert(m >= 0 && m < 0x400);
> +
> + return (e << 10) | m;
> +}
> diff --git a/src/util/half_float.h b/src/util/half_float.h
> index b3bc3f687ad..01557424735 100644
> --- a/src/util/half_float.h
> +++ b/src/util/half_float.h
> @@ -25,22 +25,27 @@
> #ifndef _HALF_FLOAT_H_
> #define _HALF_FLOAT_H_
>
> #include <stdbool.h>
> #include <stdint.h>
>
> #ifdef __cplusplus
> extern "C" {
> #endif
>
> +#define FP16_ONE 0x3C00
> +#define FP16_ZERO 0
> +
> uint16_t _mesa_float_to_half(float val);
> float _mesa_half_to_float(uint16_t val);
> +uint8_t _mesa_half_to_unorm8(uint16_t v);
> +uint16_t _mesa_uint16_div_64k_to_half(uint16_t v);
>
> static inline bool
> _mesa_half_is_negative(uint16_t h)
> {
> return !!(h & 0x8000);
> }
>
>
> #ifdef __cplusplus
> } /* extern C */
> --
> 2.17.1
>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
More information about the mesa-dev
mailing list