#include "astc.h"
#include <math.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "color.h"
#include "fp16.h"
static const int BitReverseTable[] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, 0x08, 0x88, 0x48,
0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4,
0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C,
0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2,
0x32, 0xB2, 0x72, 0xF2, 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A,
0xFA, 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, 0x0E, 0x8E,
0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, 0x01, 0x81, 0x41, 0xC1, 0x21,
0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55,
0xD5, 0x35, 0xB5, 0x75, 0xF5, 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD,
0x7D, 0xFD, 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, 0x0B,
0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, 0x07, 0x87, 0x47, 0xC7,
0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F,
0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF};
static const int WeightPrecTableA[] = {0, 0, 0, 3, 0, 5, 3, 0, 0, 0, 5, 3, 0, 5, 3, 0};
static const int WeightPrecTableB[] = {0, 0, 1, 0, 2, 0, 1, 3, 0, 0, 1, 2, 4, 2, 3, 5};
static const int CemTableA[] = {0, 3, 5, 0, 3, 5, 0, 3, 5, 0, 3, 5, 0, 3, 5, 0, 3, 0, 0};
static const int CemTableB[] = {8, 6, 5, 7, 5, 4, 6, 4, 3, 5, 3, 2, 4, 2, 1, 3, 1, 2, 1};
static inline uint_fast8_t bit_reverse_u8(const uint_fast8_t c, const int bits) {
return BitReverseTable[c] >> (8 - bits);
}
static inline uint_fast64_t bit_reverse_u64(const uint_fast64_t d, const int bits) {
uint_fast64_t ret = (uint_fast64_t)BitReverseTable[d & 0xff] << 56 |
(uint_fast64_t)BitReverseTable[d >> 8 & 0xff] << 48 | (uint_fast64_t)BitReverseTable[d >> 16 & 0xff] << 40 |
(uint_fast64_t)BitReverseTable[d >> 24 & 0xff] << 32 | (uint_fast32_t)BitReverseTable[d >> 32 & 0xff] << 24 |
(uint_fast32_t)BitReverseTable[d >> 40 & 0xff] << 16 | (uint_fast16_t)BitReverseTable[d >> 48 & 0xff] << 8 |
BitReverseTable[d >> 56 & 0xff];
return ret >> (64 - bits);
}
static inline int getbits(const uint8_t *buf, const int bit, const int len) {
return (*(int *)(buf + bit / 8) >> (bit % 8)) & ((1 << len) - 1);
}
static inline uint_fast64_t getbits64(const uint8_t *buf, const int bit, const int len) {
uint_fast64_t mask = len == 64 ? 0xffffffffffffffff : (1ull << len) - 1;
if (len < 1)
return 0;
else if (bit >= 64)
return (*(uint_fast64_t *)(buf + 8)) >> (bit - 64) & mask;
else if (bit <= 0)
return (*(uint_fast64_t *)buf) << -bit & mask;
else if (bit + len <= 64)
return (*(uint_fast64_t *)buf) >> bit & mask;
else
return ((*(uint_fast64_t *)buf) >> bit | *(uint_fast64_t *)(buf + 8) << (64 - bit)) & mask;
}
static inline uint16_t u8ptr_to_u16(const uint8_t *ptr) {
return lton16(*(uint16_t *)ptr);
}
static inline uint_fast8_t clamp(const int n) {
return n < 0 ? 0 : n > 255 ? 255 : n;
}
static inline void bit_transfer_signed(int *a, int *b) {
*b = (*b >> 1) | (*a & 0x80);
*a = (*a >> 1) & 0x3f;
if (*a & 0x20)
*a -= 0x40;
}
static inline void set_endpoint(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2, int a2) {
endpoint[0] = r1;
endpoint[1] = g1;
endpoint[2] = b1;
endpoint[3] = a1;
endpoint[4] = r2;
endpoint[5] = g2;
endpoint[6] = b2;
endpoint[7] = a2;
}
static inline void set_endpoint_clamp(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2, int a2) {
endpoint[0] = clamp(r1);
endpoint[1] = clamp(g1);
endpoint[2] = clamp(b1);
endpoint[3] = clamp(a1);
endpoint[4] = clamp(r2);
endpoint[5] = clamp(g2);
endpoint[6] = clamp(b2);
endpoint[7] = clamp(a2);
}
static inline void set_endpoint_blue(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2, int a2) {
endpoint[0] = (r1 + b1) >> 1;
endpoint[1] = (g1 + b1) >> 1;
endpoint[2] = b1;
endpoint[3] = a1;
endpoint[4] = (r2 + b2) >> 1;
endpoint[5] = (g2 + b2) >> 1;
endpoint[6] = b2;
endpoint[7] = a2;
}
static inline void set_endpoint_blue_clamp(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2,
int a2) {
endpoint[0] = clamp((r1 + b1) >> 1);
endpoint[1] = clamp((g1 + b1) >> 1);
endpoint[2] = clamp(b1);
endpoint[3] = clamp(a1);
endpoint[4] = clamp((r2 + b2) >> 1);
endpoint[5] = clamp((g2 + b2) >> 1);
endpoint[6] = clamp(b2);
endpoint[7] = clamp(a2);
}
static inline uint_fast16_t clamp_hdr(const int n) {
return n < 0 ? 0 : n > 0xfff ? 0xfff : n;
}
static inline void set_endpoint_hdr(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2, int a2) {
endpoint[0] = r1;
endpoint[1] = g1;
endpoint[2] = b1;
endpoint[3] = a1;
endpoint[4] = r2;
endpoint[5] = g2;
endpoint[6] = b2;
endpoint[7] = a2;
}
static inline void set_endpoint_hdr_clamp(int endpoint[8], int r1, int g1, int b1, int a1, int r2, int g2, int b2,
int a2) {
endpoint[0] = clamp_hdr(r1);
endpoint[1] = clamp_hdr(g1);
endpoint[2] = clamp_hdr(b1);
endpoint[3] = clamp_hdr(a1);
endpoint[4] = clamp_hdr(r2);
endpoint[5] = clamp_hdr(g2);
endpoint[6] = clamp_hdr(b2);
endpoint[7] = clamp_hdr(a2);
}
typedef uint_fast8_t (*t_select_folor_func_ptr)(int, int, int);
static uint_fast8_t select_color(int v0, int v1, int weight) {
return ((((v0 << 8 | v0) * (64 - weight) + (v1 << 8 | v1) * weight + 32) >> 6) * 255 + 32768) / 65536;
}
static uint_fast8_t select_color_hdr(int v0, int v1, int weight) {
uint16_t c = ((v0 << 4) * (64 - weight) + (v1 << 4) * weight + 32) >> 6;
uint16_t m = c & 0x7ff;
if (m < 512)
m *= 3;
else if (m < 1536)
m = 4 * m - 512;
else
m = 5 * m - 2048;
float f = fp16_ieee_to_fp32_value((c >> 1 & 0x7c00) | m >> 3);
return isfinite(f) ? clamp(roundf(f * 255)) : 255;
}
static inline uint8_t f32_to_u8(const float f) {
float c = roundf(f * 255);
if (c < 0)
return 0;
else if (c > 255)
return 255;
else
return c;
}
static inline uint8_t f16ptr_to_u8(const uint8_t *ptr) {
return f32_to_u8(fp16_ieee_to_fp32_value(lton16(*(uint16_t *)ptr)));
}
typedef struct {
int bw;
int bh;
int width;
int height;
int part_num;
int dual_plane;
int plane_selector;
int weight_range;
int weight_num;
int cem[4];
int cem_range;
int endpoint_value_num;
int endpoints[4][8];
int weights[144][2];
int partition[144];
} BlockData;
typedef struct {
int bits;
int nonbits;
} IntSeqData;
void decode_intseq(const uint8_t *buf, int offset, const int a, const int b, const int count, const int reverse,
IntSeqData *out) {
static int mt[] = {0, 2, 4, 5, 7};
static int mq[] = {0, 3, 5};
static int TritsTable[5][256] = {
{0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 0, 0,
1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 1, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1,
2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2,
2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0,
0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0,
1, 2, 2, 0, 1, 2, 1, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1,
2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 0, 0, 1, 2, 1, 0, 1, 2, 2, 0, 1, 2, 2},
{0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2,
2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 0, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2,
0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 0, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1,
1, 1, 1, 1, 2, 2, 2, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2,
2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 2,
2, 1, 0, 0, 0, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 2, 2, 1},
{0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0,
0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0,
0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2,
2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2,
1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1,
1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1,
1, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2}};
static int QuintsTable[3][128] = {
{0, 1, 2, 3, 4, 0, 4, 4, 0, 1, 2, 3, 4, 1, 4, 4, 0, 1, 2, 3, 4, 2, 4, 4, 0, 1, 2, 3, 4, 3, 4, 4,
0, 1, 2, 3, 4, 0, 4, 0, 0, 1, 2, 3, 4, 1, 4, 1, 0, 1, 2, 3, 4, 2, 4, 2, 0, 1, 2, 3, 4, 3, 4, 3,
0, 1, 2, 3, 4, 0, 2, 3, 0, 1, 2, 3, 4, 1, 2, 3, 0, 1, 2, 3, 4, 2, 2, 3, 0, 1, 2, 3, 4, 3, 2, 3,
0, 1, 2, 3, 4, 0, 0, 1, 0, 1, 2, 3, 4, 1, 0, 1, 0, 1, 2, 3, 4, 2, 0, 1, 0, 1, 2, 3, 4, 3, 0, 1},
{0, 0, 0, 0, 0, 4, 4, 4, 1, 1, 1, 1, 1, 4, 4, 4, 2, 2, 2, 2, 2, 4, 4, 4, 3, 3, 3, 3, 3, 4, 4, 4,
0, 0, 0, 0, 0, 4, 0, 4, 1, 1, 1, 1, 1, 4, 1, 4, 2, 2, 2, 2, 2, 4, 2, 4, 3, 3, 3, 3, 3, 4, 3, 4,
0, 0, 0, 0, 0, 4, 0, 0, 1, 1, 1, 1, 1, 4, 1, 1, 2, 2, 2, 2, 2, 4, 2, 2, 3, 3, 3, 3, 3, 4, 3, 3,
0, 0, 0, 0, 0, 4, 0, 0, 1, 1, 1, 1, 1, 4, 1, 1, 2, 2, 2, 2, 2, 4, 2, 2, 3, 3, 3, 3, 3, 4, 3, 3},
{0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 1, 4, 0, 0, 0, 0, 0, 0, 2, 4, 0, 0, 0, 0, 0, 0, 3, 4,
1, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 1, 1, 4, 4,
2, 2, 2, 2, 2, 2, 4, 4, 2, 2, 2, 2, 2, 2, 4, 4, 2, 2, 2, 2, 2, 2, 4, 4, 2, 2, 2, 2, 2, 2, 4, 4,
3, 3, 3, 3, 3, 3, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4}};
if (count <= 0)
return;
int n = 0;
if (a == 3) {
int mask = (1 << b) - 1;
int block_count = (count + 4) / 5;
int last_block_count = (count + 4) % 5 + 1;
int block_size = 8 + 5 * b;
int last_block_size = (block_size * last_block_count + 4) / 5;
if (reverse) {
for (int i = 0, p = offset; i < block_count; i++, p -= block_size) {
int now_size = (i < block_count - 1) ? block_size : last_block_size;
uint_fast64_t d = bit_reverse_u64(getbits64(buf, p - now_size, now_size), now_size);
int x =
(d >> b & 3) | (d >> b * 2 & 0xc) | (d >> b * 3 & 0x10) | (d >> b * 4 & 0x60) | (d >> b * 5 & 0x80);
for (int j = 0; j < 5 && n < count; j++, n++)
out[n] = { static_cast<int>(d >> (mt[j] + b * j) & mask), TritsTable[j][x]};
}
} else {
for (int i = 0, p = offset; i < block_count; i++, p += block_size) {
uint_fast64_t d = getbits64(buf, p, (i < block_count - 1) ? block_size : last_block_size);
int x =
(d >> b & 3) | (d >> b * 2 & 0xc) | (d >> b * 3 & 0x10) | (d >> b * 4 & 0x60) | (d >> b * 5 & 0x80);
for (int j = 0; j < 5 && n < count; j++, n++)
out[n] = { static_cast<int>(d >> (mt[j] + b * j) & mask), TritsTable[j][x]};
}
}
} else if (a == 5) {
int mask = (1 << b) - 1;
int block_count = (count + 2) / 3;
int last_block_count = (count + 2) % 3 + 1;
int block_size = 7 + 3 * b;
int last_block_size = (block_size * last_block_count + 2) / 3;
if (reverse) {
for (int i = 0, p = offset; i < block_count; i++, p -= block_size) {
int now_size = (i < block_count - 1) ? block_size : last_block_size;
uint_fast64_t d = bit_reverse_u64(getbits64(buf, p - now_size, now_size), now_size);
int x = (d >> b & 7) | (d >> b * 2 & 0x18) | (d >> b * 3 & 0x60);
for (int j = 0; j < 3 && n < count; j++, n++)
out[n] = { static_cast<int>(d >> (mq[j] + b * j) & mask), QuintsTable[j][x]};
}
} else {
for (int i = 0, p = offset; i < block_count; i++, p += block_size) {
uint_fast64_t d = getbits64(buf, p, (i < block_count - 1) ? block_size : last_block_size);
int x = (d >> b & 7) | (d >> b * 2 & 0x18) | (d >> b * 3 & 0x60);
for (int j = 0; j < 3 && n < count; j++, n++)
out[n] = { static_cast<int>(d >> (mq[j] + b * j) & mask), QuintsTable[j][x]};
}
}
} else {
if (reverse)
for (int p = offset - b; n < count; n++, p -= b)
out[n] = {bit_reverse_u8(getbits(buf, p, b), b), 0};
else
for (int p = offset; n < count; n++, p += b)
out[n] = {getbits(buf, p, b), 0};
}
}
void decode_block_params(const uint8_t *buf, BlockData *block_data) {
block_data->dual_plane = !!(buf[1] & 4);
block_data->weight_range = (buf[0] >> 4 & 1) | (buf[1] << 2 & 8);
if (buf[0] & 3) {
block_data->weight_range |= buf[0] << 1 & 6;
switch (buf[0] & 0xc) {
case 0:
block_data->width = (u8ptr_to_u16(buf) >> 7 & 3) + 4;
block_data->height = (buf[0] >> 5 & 3) + 2;
break;
case 4:
block_data->width = (u8ptr_to_u16(buf) >> 7 & 3) + 8;
block_data->height = (buf[0] >> 5 & 3) + 2;
break;
case 8:
block_data->width = (buf[0] >> 5 & 3) + 2;
block_data->height = (u8ptr_to_u16(buf) >> 7 & 3) + 8;
break;
case 12:
if (buf[1] & 1) {
block_data->width = (buf[0] >> 7 & 1) + 2;
block_data->height = (buf[0] >> 5 & 3) + 2;
} else {
block_data->width = (buf[0] >> 5 & 3) + 2;
block_data->height = (buf[0] >> 7 & 1) + 6;
}
break;
}
} else {
block_data->weight_range |= buf[0] >> 1 & 6;
switch (u8ptr_to_u16(buf) & 0x180) {
case 0:
block_data->width = 12;
block_data->height = (buf[0] >> 5 & 3) + 2;
break;
case 0x80:
block_data->width = (buf[0] >> 5 & 3) + 2;
block_data->height = 12;
break;
case 0x100:
block_data->width = (buf[0] >> 5 & 3) + 6;
block_data->height = (buf[1] >> 1 & 3) + 6;
block_data->dual_plane = 0;
block_data->weight_range &= 7;
break;
case 0x180:
block_data->width = (buf[0] & 0x20) ? 10 : 6;
block_data->height = (buf[0] & 0x20) ? 6 : 10;
break;
}
}
block_data->part_num = (buf[1] >> 3 & 3) + 1;
block_data->weight_num = block_data->width * block_data->height;
if (block_data->dual_plane)
block_data->weight_num *= 2;
int weight_bits, config_bits, cem_base = 0;
switch (WeightPrecTableA[block_data->weight_range]) {
case 3:
weight_bits =
block_data->weight_num * WeightPrecTableB[block_data->weight_range] + (block_data->weight_num * 8 + 4) / 5;
break;
case 5:
weight_bits =
block_data->weight_num * WeightPrecTableB[block_data->weight_range] + (block_data->weight_num * 7 + 2) / 3;
break;
default:
weight_bits = block_data->weight_num * WeightPrecTableB[block_data->weight_range];
}
if (block_data->part_num == 1) {
block_data->cem[0] = u8ptr_to_u16(buf + 1) >> 5 & 0xf;
config_bits = 17;
} else {
cem_base = u8ptr_to_u16(buf + 2) >> 7 & 3;
if (cem_base == 0) {
int cem = buf[3] >> 1 & 0xf;
for (int i = 0; i < block_data->part_num; i++)
block_data->cem[i] = cem;
config_bits = 29;
} else {
for (int i = 0; i < block_data->part_num; i++)
block_data->cem[i] = ((buf[3] >> (i + 1) & 1) + cem_base - 1) << 2;
switch (block_data->part_num) {
case 2:
block_data->cem[0] |= buf[3] >> 3 & 3;
block_data->cem[1] |= getbits(buf, 126 - weight_bits, 2);
break;
case 3:
block_data->cem[0] |= buf[3] >> 4 & 1;
block_data->cem[0] |= getbits(buf, 122 - weight_bits, 2) & 2;
block_data->cem[1] |= getbits(buf, 124 - weight_bits, 2);
block_data->cem[2] |= getbits(buf, 126 - weight_bits, 2);
break;
case 4:
for (int i = 0; i < 4; i++)
block_data->cem[i] |= getbits(buf, 120 + i * 2 - weight_bits, 2);
break;
}
config_bits = 25 + block_data->part_num * 3;
}
}
if (block_data->dual_plane) {
config_bits += 2;
block_data->plane_selector =
getbits(buf, cem_base ? 130 - weight_bits - block_data->part_num * 3 : 126 - weight_bits, 2);
}
int remain_bits = 128 - config_bits - weight_bits;
block_data->endpoint_value_num = 0;
for (int i = 0; i < block_data->part_num; i++)
block_data->endpoint_value_num += (block_data->cem[i] >> 1 & 6) + 2;
for (int i = 0, endpoint_bits; i < (int)(sizeof(CemTableA) / sizeof(int)); i++) {
switch (CemTableA[i]) {
case 3:
endpoint_bits =
block_data->endpoint_value_num * CemTableB[i] + (block_data->endpoint_value_num * 8 + 4) / 5;
break;
case 5:
endpoint_bits =
block_data->endpoint_value_num * CemTableB[i] + (block_data->endpoint_value_num * 7 + 2) / 3;
break;
default:
endpoint_bits = block_data->endpoint_value_num * CemTableB[i];
}
if (endpoint_bits <= remain_bits) {
block_data->cem_range = i;
break;
}
}
}
void decode_endpoints_hdr7(int *endpoints, int *v) {
int modeval = (v[2] >> 4 & 0x8) | (v[1] >> 5 & 0x4) | (v[0] >> 6);
int major_component, mode;
if ((modeval & 0xc) != 0xc) {
major_component = modeval >> 2;
mode = modeval & 3;
} else if (modeval != 0xf) {
major_component = modeval & 3;
mode = 4;
} else {
major_component = 0;
mode = 5;
}
int c[] = {v[0] & 0x3f, v[1] & 0x1f, v[2] & 0x1f, v[3] & 0x1f};
switch (mode) {
case 0:
c[3] |= v[3] & 0x60;
c[0] |= v[3] >> 1 & 0x40;
c[0] |= v[2] << 1 & 0x80;
c[0] |= v[1] << 3 & 0x300;
c[0] |= v[2] << 5 & 0x400;
c[0] <<= 1;
c[1] <<= 1;
c[2] <<= 1;
c[3] <<= 1;
break;
case 1:
c[1] |= v[1] & 0x20;
c[2] |= v[2] & 0x20;
c[0] |= v[3] >> 1 & 0x40;
c[0] |= v[2] << 1 & 0x80;
c[0] |= v[1] << 2 & 0x100;
c[0] |= v[3] << 4 & 0x600;
c[0] <<= 1;
c[1] <<= 1;
c[2] <<= 1;
c[3] <<= 1;
break;
case 2:
c[3] |= v[3] & 0xe0;
c[0] |= v[2] << 1 & 0xc0;
c[0] |= v[1] << 3 & 0x300;
c[0] <<= 2;
c[1] <<= 2;
c[2] <<= 2;
c[3] <<= 2;
break;
case 3:
c[1] |= v[1] & 0x20;
c[2] |= v[2] & 0x20;
c[3] |= v[3] & 0x60;
c[0] |= v[3] >> 1 & 0x40;
c[0] |= v[2] << 1 & 0x80;
c[0] |= v[1] << 2 & 0x100;
c[0] <<= 3;
c[1] <<= 3;
c[2] <<= 3;
c[3] <<= 3;
break;
case 4:
c[1] |= v[1] & 0x60;
c[2] |= v[2] & 0x60;
c[3] |= v[3] & 0x20;
c[0] |= v[3] >> 1 & 0x40;
c[0] |= v[3] << 1 & 0x80;
c[0] <<= 4;
c[1] <<= 4;
c[2] <<= 4;
c[3] <<= 4;
break;
case 5:
c[1] |= v[1] & 0x60;
c[2] |= v[2] & 0x60;
c[3] |= v[3] & 0x60;
c[0] |= v[3] >> 1 & 0x40;
c[0] <<= 5;
c[1] <<= 5;
c[2] <<= 5;
c[3] <<= 5;
break;
}
if (mode != 5) {
c[1] = c[0] - c[1];
c[2] = c[0] - c[2];
}
if (major_component == 1)
set_endpoint_hdr_clamp(endpoints, c[1] - c[3], c[0] - c[3], c[2] - c[3], 0x780, c[1], c[0], c[2], 0x780);
else if (major_component == 2)
set_endpoint_hdr_clamp(endpoints, c[2] - c[3], c[1] - c[3], c[0] - c[3], 0x780, c[2], c[1], c[0], 0x780);
else
set_endpoint_hdr_clamp(endpoints, c[0] - c[3], c[1] - c[3], c[2] - c[3], 0x780, c[0], c[1], c[2], 0x780);
}
void decode_endpoints_hdr11(int *endpoints, int *v, int alpha1, int alpha2) {
int major_component = (v[4] >> 7) | (v[5] >> 6 & 2);
if (major_component == 3) {
set_endpoint_hdr(endpoints, v[0] << 4, v[2] << 4, v[4] << 5 & 0xfe0, alpha1, v[1] << 4, v[3] << 4,
v[5] << 5 & 0xfe0, alpha2);
return;
}
int mode = (v[1] >> 7) | (v[2] >> 6 & 2) | (v[3] >> 5 & 4);
int va = v[0] | (v[1] << 2 & 0x100);
int vb0 = v[2] & 0x3f, vb1 = v[3] & 0x3f;
int vc = v[1] & 0x3f;
int16_t vd0, vd1;
switch (mode) {
case 0:
case 2:
vd0 = v[4] & 0x7f;
if (vd0 & 0x40)
vd0 |= 0xff80;
vd1 = v[5] & 0x7f;
if (vd1 & 0x40)
vd1 |= 0xff80;
break;
case 1:
case 3:
case 5:
case 7:
vd0 = v[4] & 0x3f;
if (vd0 & 0x20)
vd0 |= 0xffc0;
vd1 = v[5] & 0x3f;
if (vd1 & 0x20)
vd1 |= 0xffc0;
break;
default:
vd0 = v[4] & 0x1f;
if (vd0 & 0x10)
vd0 |= 0xffe0;
vd1 = v[5] & 0x1f;
if (vd1 & 0x10)
vd1 |= 0xffe0;
break;
}
switch (mode) {
case 0:
vb0 |= v[2] & 0x40;
vb1 |= v[3] & 0x40;
break;
case 1:
vb0 |= v[2] & 0x40;
vb1 |= v[3] & 0x40;
vb0 |= v[4] << 1 & 0x80;
vb1 |= v[5] << 1 & 0x80;
break;
case 2:
va |= v[2] << 3 & 0x200;
vc |= v[3] & 0x40;
break;
case 3:
va |= v[4] << 3 & 0x200;
vc |= v[5] & 0x40;
vb0 |= v[2] & 0x40;
vb1 |= v[3] & 0x40;
break;
case 4:
va |= v[4] << 4 & 0x200;
va |= v[5] << 5 & 0x400;
vb0 |= v[2] & 0x40;
vb1 |= v[3] & 0x40;
vb0 |= v[4] << 1 & 0x80;
vb1 |= v[5] << 1 & 0x80;
break;
case 5:
va |= v[2] << 3 & 0x200;
va |= v[3] << 4 & 0x400;
vc |= v[5] & 0x40;
vc |= v[4] << 1 & 0x80;
break;
case 6:
va |= v[4] << 4 & 0x200;
va |= v[5] << 5 & 0x400;
va |= v[4] << 5 & 0x800;
vc |= v[5] & 0x40;
vb0 |= v[2] & 0x40;
vb1 |= v[3] & 0x40;
break;
case 7:
va |= v[2] << 3 & 0x200;
va |= v[3] << 4 & 0x400;
va |= v[4] << 5 & 0x800;
vc |= v[5] & 0x40;
break;
}
int shamt = (mode >> 1) ^ 3;
va <<= shamt;
vb0 <<= shamt;
vb1 <<= shamt;
vc <<= shamt;
int mult = 1 << shamt;
vd0 *= mult;
vd1 *= mult;
if (major_component == 1)
set_endpoint_hdr_clamp(endpoints, va - vb0 - vc - vd0, va - vc, va - vb1 - vc - vd1, alpha1, va - vb0, va,
va - vb1, alpha2);
else if (major_component == 2)
set_endpoint_hdr_clamp(endpoints, va - vb1 - vc - vd1, va - vb0 - vc - vd0, va - vc, alpha1, va - vb1, va - vb0,
va, alpha2);
else
set_endpoint_hdr_clamp(endpoints, va - vc, va - vb0 - vc - vd0, va - vb1 - vc - vd1, alpha1, va, va - vb0,
va - vb1, alpha2);
}
void decode_endpoints(const uint8_t *buf, BlockData *data) {
static const int TritsTable[] = {0, 204, 93, 44, 22, 11, 5};
static const int QuintsTable[] = {0, 113, 54, 26, 13, 6};
IntSeqData seq[32];
int ev[32];
decode_intseq(buf, data->part_num == 1 ? 17 : 29, CemTableA[data->cem_range], CemTableB[data->cem_range],
data->endpoint_value_num, 0, seq);
switch (CemTableA[data->cem_range]) {
case 3:
for (int i = 0, b, c = TritsTable[CemTableB[data->cem_range]]; i < data->endpoint_value_num; i++) {
int a = (seq[i].bits & 1) * 0x1ff;
int x = seq[i].bits >> 1;
switch (CemTableB[data->cem_range]) {
case 1:
b = 0;
break;
case 2:
b = 0b100010110 * x;
break;
case 3:
b = x << 7 | x << 2 | x;
break;
case 4:
b = x << 6 | x;
break;
case 5:
b = x << 5 | x >> 2;
break;
case 6:
b = x << 4 | x >> 4;
break;
}
ev[i] = (a & 0x80) | ((seq[i].nonbits * c + b) ^ a) >> 2;
}
break;
case 5:
for (int i = 0, b, c = QuintsTable[CemTableB[data->cem_range]]; i < data->endpoint_value_num; i++) {
int a = (seq[i].bits & 1) * 0x1ff;
int x = seq[i].bits >> 1;
switch (CemTableB[data->cem_range]) {
case 1:
b = 0;
break;
case 2:
b = 0b100001100 * x;
break;
case 3:
b = x << 7 | x << 1 | x >> 1;
break;
case 4:
b = x << 6 | x >> 1;
break;
case 5:
b = x << 5 | x >> 3;
break;
}
ev[i] = (a & 0x80) | ((seq[i].nonbits * c + b) ^ a) >> 2;
}
break;
default:
switch (CemTableB[data->cem_range]) {
case 1:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits * 0xff;
break;
case 2:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits * 0x55;
break;
case 3:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits << 5 | seq[i].bits << 2 | seq[i].bits >> 1;
break;
case 4:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits << 4 | seq[i].bits;
break;
case 5:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits << 3 | seq[i].bits >> 2;
break;
case 6:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits << 2 | seq[i].bits >> 4;
break;
case 7:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits << 1 | seq[i].bits >> 6;
break;
case 8:
for (int i = 0; i < data->endpoint_value_num; i++)
ev[i] = seq[i].bits;
break;
}
}
int *v = ev;
for (int cem = 0; cem < data->part_num; v += (data->cem[cem] / 4 + 1) * 2, cem++) {
switch (data->cem[cem]) {
case 0:
set_endpoint(data->endpoints[cem], v[0], v[0], v[0], 255, v[1], v[1], v[1], 255);
break;
case 1: {
int l0 = (v[0] >> 2) | (v[1] & 0xc0);
int l1 = clamp(l0 + (v[1] & 0x3f));
set_endpoint(data->endpoints[cem], l0, l0, l0, 255, l1, l1, l1, 255);
} break;
case 2: {
int y0, y1;
if (v[0] <= v[1]) {
y0 = v[0] << 4;
y1 = v[1] << 4;
} else {
y0 = (v[1] << 4) + 8;
y1 = (v[0] << 4) - 8;
}
set_endpoint_hdr(data->endpoints[cem], y0, y0, y0, 0x780, y1, y1, y1, 0x780);
} break;
case 3: {
int y0, d;
if (v[0] & 0x80) {
y0 = (v[1] & 0xe0) << 4 | (v[0] & 0x7f) << 2;
d = (v[1] & 0x1f) << 2;
} else {
y0 = (v[1] & 0xf0) << 4 | (v[0] & 0x7f) << 1;
d = (v[1] & 0x0f) << 1;
}
int y1 = clamp_hdr(y0 + d);
set_endpoint_hdr(data->endpoints[cem], y0, y0, y0, 0x780, y1, y1, y1, 0x780);
} break;
case 4:
set_endpoint(data->endpoints[cem], v[0], v[0], v[0], v[2], v[1], v[1], v[1], v[3]);
break;
case 5:
bit_transfer_signed(&v[1], &v[0]);
bit_transfer_signed(&v[3], &v[2]);
v[1] += v[0];
set_endpoint_clamp(data->endpoints[cem], v[0], v[0], v[0], v[2], v[1], v[1], v[1], v[2] + v[3]);
break;
case 6:
set_endpoint(data->endpoints[cem], v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8, 255, v[0], v[1],
v[2], 255);
break;
case 7:
decode_endpoints_hdr7(data->endpoints[cem], v);
break;
case 8:
if (v[0] + v[2] + v[4] <= v[1] + v[3] + v[5])
set_endpoint(data->endpoints[cem], v[0], v[2], v[4], 255, v[1], v[3], v[5], 255);
else
set_endpoint_blue(data->endpoints[cem], v[1], v[3], v[5], 255, v[0], v[2], v[4], 255);
break;
case 9:
bit_transfer_signed(&v[1], &v[0]);
bit_transfer_signed(&v[3], &v[2]);
bit_transfer_signed(&v[5], &v[4]);
if (v[1] + v[3] + v[5] >= 0)
set_endpoint_clamp(data->endpoints[cem], v[0], v[2], v[4], 255, v[0] + v[1], v[2] + v[3], v[4] + v[5],
255);
else
set_endpoint_blue_clamp(data->endpoints[cem], v[0] + v[1], v[2] + v[3], v[4] + v[5], 255, v[0], v[2],
v[4], 255);
break;
case 10:
set_endpoint(data->endpoints[cem], v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8, v[4], v[0], v[1],
v[2], v[5]);
break;
case 11:
decode_endpoints_hdr11(data->endpoints[cem], v, 0x780, 0x780);
break;
case 12:
if (v[0] + v[2] + v[4] <= v[1] + v[3] + v[5])
set_endpoint(data->endpoints[cem], v[0], v[2], v[4], v[6], v[1], v[3], v[5], v[7]);
else
set_endpoint_blue(data->endpoints[cem], v[1], v[3], v[5], v[7], v[0], v[2], v[4], v[6]);
break;
case 13:
bit_transfer_signed(&v[1], &v[0]);
bit_transfer_signed(&v[3], &v[2]);
bit_transfer_signed(&v[5], &v[4]);
bit_transfer_signed(&v[7], &v[6]);
if (v[1] + v[3] + v[5] >= 0)
set_endpoint_clamp(data->endpoints[cem], v[0], v[2], v[4], v[6], v[0] + v[1], v[2] + v[3], v[4] + v[5],
v[6] + v[7]);
else
set_endpoint_blue_clamp(data->endpoints[cem], v[0] + v[1], v[2] + v[3], v[4] + v[5], v[6] + v[7], v[0],
v[2], v[4], v[6]);
break;
case 14:
decode_endpoints_hdr11(data->endpoints[cem], v, v[6], v[7]);
break;
case 15: {
int mode = ((v[6] >> 7) & 1) | ((v[7] >> 6) & 2);
v[6] &= 0x7f;
v[7] &= 0x7f;
if (mode == 3) {
decode_endpoints_hdr11(data->endpoints[cem], v, v[6] << 5, v[7] << 5);
} else {
v[6] |= (v[7] << (mode + 1)) & 0x780;
v[7] = ((v[7] & (0x3f >> mode)) ^ (0x20 >> mode)) - (0x20 >> mode);
v[6] <<= 4 - mode;
v[7] <<= 4 - mode;
decode_endpoints_hdr11(data->endpoints[cem], v, v[6], clamp_hdr(v[6] + v[7]));
}
} break;
//default:
// rb_raise(rb_eStandardError, "Unsupported ASTC format");
}
}
}
void decode_weights(const uint8_t *buf, BlockData *data) {
IntSeqData seq[128];
int wv[128] = {};
decode_intseq(buf, 128, WeightPrecTableA[data->weight_range], WeightPrecTableB[data->weight_range],
data->weight_num, 1, seq);
if (WeightPrecTableA[data->weight_range] == 0) {
switch (WeightPrecTableB[data->weight_range]) {
case 1:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].bits ? 63 : 0;
break;
case 2:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].bits << 4 | seq[i].bits << 2 | seq[i].bits;
break;
case 3:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].bits << 3 | seq[i].bits;
break;
case 4:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].bits << 2 | seq[i].bits >> 2;
break;
case 5:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].bits << 1 | seq[i].bits >> 4;
break;
}
for (int i = 0; i < data->weight_num; i++)
if (wv[i] > 32)
++wv[i];
} else if (WeightPrecTableB[data->weight_range] == 0) {
int s = WeightPrecTableA[data->weight_range] == 3 ? 32 : 16;
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].nonbits * s;
} else {
if (WeightPrecTableA[data->weight_range] == 3) {
switch (WeightPrecTableB[data->weight_range]) {
case 1:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].nonbits * 50;
break;
case 2:
for (int i = 0; i < data->weight_num; i++) {
wv[i] = seq[i].nonbits * 23;
if (seq[i].bits & 2)
wv[i] += 0b1000101;
}
break;
case 3:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].nonbits * 11 + ((seq[i].bits << 4 | seq[i].bits >> 1) & 0b1100011);
break;
}
} else if (WeightPrecTableA[data->weight_range] == 5) {
switch (WeightPrecTableB[data->weight_range]) {
case 1:
for (int i = 0; i < data->weight_num; i++)
wv[i] = seq[i].nonbits * 28;
break;
case 2:
for (int i = 0; i < data->weight_num; i++) {
wv[i] = seq[i].nonbits * 13;
if (seq[i].bits & 2)
wv[i] += 0b1000010;
}
break;
}
}
for (int i = 0; i < data->weight_num; i++) {
int a = (seq[i].bits & 1) * 0x7f;
wv[i] = (a & 0x20) | ((wv[i] ^ a) >> 2);
if (wv[i] > 32)
++wv[i];
}
}
int ds = (1024 + data->bw / 2) / (data->bw - 1);
int dt = (1024 + data->bh / 2) / (data->bh - 1);
int pn = data->dual_plane ? 2 : 1;
for (int t = 0, i = 0; t < data->bh; t++) {
for (int s = 0; s < data->bw; s++, i++) {
int gs = (ds * s * (data->width - 1) + 32) >> 6;
int gt = (dt * t * (data->height - 1) + 32) >> 6;
int fs = gs & 0xf;
int ft = gt & 0xf;
int v = (gs >> 4) + (gt >> 4) * data->width;
int w11 = (fs * ft + 8) >> 4;
int w10 = ft - w11;
int w01 = fs - w11;
int w00 = 16 - fs - ft + w11;
for (int p = 0; p < pn; p++) {
int p00 = wv[v * pn + p];
int p01 = wv[(v + 1) * pn + p];
int p10 = wv[(v + data->width) * pn + p];
int p11 = wv[(v + data->width + 1) * pn + p];
data->weights[i][p] = (p00 * w00 + p01 * w01 + p10 * w10 + p11 * w11 + 8) >> 4;
}
}
}
}
void select_partition(const uint8_t *buf, BlockData *data) {
int small_block = data->bw * data->bh < 31;
int seed = (*(int *)buf >> 13 & 0x3ff) | (data->part_num - 1) << 10;
uint32_t rnum = seed;
rnum ^= rnum >> 15;
rnum -= rnum << 17;
rnum += rnum << 7;
rnum += rnum << 4;
rnum ^= rnum >> 5;
rnum += rnum << 16;
rnum ^= rnum >> 7;
rnum ^= rnum >> 3;
rnum ^= rnum << 6;
rnum ^= rnum >> 17;
int seeds[8];
for (int i = 0; i < 8; i++) {
seeds[i] = (rnum >> (i * 4)) & 0xF;
seeds[i] *= seeds[i];
}
int sh[2] = {seed & 2 ? 4 : 5, data->part_num == 3 ? 6 : 5};
if (seed & 1)
for (int i = 0; i < 8; i++)
seeds[i] >>= sh[i % 2];
else
for (int i = 0; i < 8; i++)
seeds[i] >>= sh[1 - i % 2];
if (small_block) {
for (int t = 0, i = 0; t < data->bh; t++) {
for (int s = 0; s < data->bw; s++, i++) {
int x = s << 1;
int y = t << 1;
int a = (seeds[0] * x + seeds[1] * y + (rnum >> 14)) & 0x3f;
int b = (seeds[2] * x + seeds[3] * y + (rnum >> 10)) & 0x3f;
int c = data->part_num < 3 ? 0 : (seeds[4] * x + seeds[5] * y + (rnum >> 6)) & 0x3f;
int d = data->part_num < 4 ? 0 : (seeds[6] * x + seeds[7] * y + (rnum >> 2)) & 0x3f;
data->partition[i] = (a >= b && a >= c && a >= d) ? 0 : (b >= c && b >= d) ? 1 : (c >= d) ? 2 : 3;
}
}
} else {
for (int y = 0, i = 0; y < data->bh; y++) {
for (int x = 0; x < data->bw; x++, i++) {
int a = (seeds[0] * x + seeds[1] * y + (rnum >> 14)) & 0x3f;
int b = (seeds[2] * x + seeds[3] * y + (rnum >> 10)) & 0x3f;
int c = data->part_num < 3 ? 0 : (seeds[4] * x + seeds[5] * y + (rnum >> 6)) & 0x3f;
int d = data->part_num < 4 ? 0 : (seeds[6] * x + seeds[7] * y + (rnum >> 2)) & 0x3f;
data->partition[i] = (a >= b && a >= c && a >= d) ? 0 : (b >= c && b >= d) ? 1 : (c >= d) ? 2 : 3;
}
}
}
}
void applicate_color(const BlockData *data, uint32_t *outbuf) {
static const t_select_folor_func_ptr FuncTableC[] = {
select_color, select_color, select_color_hdr, select_color_hdr, select_color, select_color,
select_color, select_color_hdr, select_color, select_color, select_color, select_color_hdr,
select_color, select_color, select_color_hdr, select_color_hdr};
static const t_select_folor_func_ptr FuncTableA[] = {
select_color, select_color, select_color_hdr, select_color_hdr, select_color, select_color,
select_color, select_color_hdr, select_color, select_color, select_color, select_color_hdr,
select_color, select_color, select_color, select_color_hdr};
if (data->dual_plane) {
int ps[] = {0, 0, 0, 0};
ps[data->plane_selector] = 1;
if (data->part_num > 1) {
for (int i = 0; i < data->bw * data->bh; i++) {
int p = data->partition[i];
uint_fast8_t r =
FuncTableC[data->cem[p]](data->endpoints[p][0], data->endpoints[p][4], data->weights[i][ps[0]]);
uint_fast8_t g =
FuncTableC[data->cem[p]](data->endpoints[p][1], data->endpoints[p][5], data->weights[i][ps[1]]);
uint_fast8_t b =
FuncTableC[data->cem[p]](data->endpoints[p][2], data->endpoints[p][6], data->weights[i][ps[2]]);
uint_fast8_t a =
FuncTableA[data->cem[p]](data->endpoints[p][3], data->endpoints[p][7], data->weights[i][ps[3]]);
outbuf[i] = color(r, g, b, a);
}
} else {
for (int i = 0; i < data->bw * data->bh; i++) {
uint_fast8_t r =
FuncTableC[data->cem[0]](data->endpoints[0][0], data->endpoints[0][4], data->weights[i][ps[0]]);
uint_fast8_t g =
FuncTableC[data->cem[0]](data->endpoints[0][1], data->endpoints[0][5], data->weights[i][ps[1]]);
uint_fast8_t b =
FuncTableC[data->cem[0]](data->endpoints[0][2], data->endpoints[0][6], data->weights[i][ps[2]]);
uint_fast8_t a =
FuncTableA[data->cem[0]](data->endpoints[0][3], data->endpoints[0][7], data->weights[i][ps[3]]);
outbuf[i] = color(r, g, b, a);
}
}
} else if (data->part_num > 1) {
for (int i = 0; i < data->bw * data->bh; i++) {
int p = data->partition[i];
uint_fast8_t r =
FuncTableC[data->cem[p]](data->endpoints[p][0], data->endpoints[p][4], data->weights[i][0]);
uint_fast8_t g =
FuncTableC[data->cem[p]](data->endpoints[p][1], data->endpoints[p][5], data->weights[i][0]);
uint_fast8_t b =
FuncTableC[data->cem[p]](data->endpoints[p][2], data->endpoints[p][6], data->weights[i][0]);
uint_fast8_t a =
FuncTableA[data->cem[p]](data->endpoints[p][3], data->endpoints[p][7], data->weights[i][0]);
outbuf[i] = color(r, g, b, a);
}
} else {
for (int i = 0; i < data->bw * data->bh; i++) {
uint_fast8_t r =
FuncTableC[data->cem[0]](data->endpoints[0][0], data->endpoints[0][4], data->weights[i][0]);
uint_fast8_t g =
FuncTableC[data->cem[0]](data->endpoints[0][1], data->endpoints[0][5], data->weights[i][0]);
uint_fast8_t b =
FuncTableC[data->cem[0]](data->endpoints[0][2], data->endpoints[0][6], data->weights[i][0]);
uint_fast8_t a =
FuncTableA[data->cem[0]](data->endpoints[0][3], data->endpoints[0][7], data->weights[i][0]);
outbuf[i] = color(r, g, b, a);
}
}
}
void decode_block(const uint8_t *buf, const int bw, const int bh, uint32_t *outbuf) {
if (buf[0] == 0xfc && (buf[1] & 1) == 1) {
uint_fast32_t c;
if (buf[1] & 2)
c = color(f16ptr_to_u8(buf + 8), f16ptr_to_u8(buf + 10), f16ptr_to_u8(buf + 12), f16ptr_to_u8(buf + 14));
else
c = color(buf[9], buf[11], buf[13], buf[15]);
for (int i = 0; i < bw * bh; i++)
outbuf[i] = c;
} else if (((buf[0] & 0xc3) == 0xc0 && (buf[1] & 1) == 1) || (buf[0] & 0xf) == 0) {
uint_fast32_t c = color(255, 0, 255, 255);
for (int i = 0; i < bw * bh; i++)
outbuf[i] = c;
} else {
BlockData block_data;
block_data.bw = bw;
block_data.bh = bh;
decode_block_params(buf, &block_data);
decode_endpoints(buf, &block_data);
decode_weights(buf, &block_data);
if (block_data.part_num > 1)
select_partition(buf, &block_data);
applicate_color(&block_data, outbuf);
}
}
int decode_astc(const uint8_t *data, const long w, const long h, const int bw, const int bh, uint32_t *image) {
const long num_blocks_x = (w + bw - 1) / bw;
const long num_blocks_y = (h + bh - 1) / bh;
uint32_t buffer[144];
const uint8_t *d = data;
for (long by = 0; by < num_blocks_y; by++) {
for (long bx = 0; bx < num_blocks_x; bx++, d += 16) {
decode_block(d, bw, bh, buffer);
copy_block_buffer(bx, by, w, h, bw, bh, buffer, image);
}
}
return 1;
}