/
etc2.go
665 lines (615 loc) Β· 31 KB
/
etc2.go
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// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package image
import (
"bytes"
"github.com/google/gapid/core/data/endian"
"github.com/google/gapid/core/math/sint"
"github.com/google/gapid/core/math/u64"
"github.com/google/gapid/core/os/device"
"github.com/google/gapid/core/stream"
)
var (
ETC2_RGB_U8_NORM = NewETC2_RGB_U8_NORM("ETC2_RGB_U8_NORM")
ETC2_RGBA_U8_NORM = NewETC2_RGBA_U8_NORM("ETC2_RGBA_U8_NORM")
ETC2_RGBA_U8U8U8U1_NORM = NewETC2_RGBA_U8U8U8U1_NORM("ETC2_RGBA_U8U8U8U1_NORM")
ETC2_SRGB_U8_NORM = NewETC2_SRGB_U8_NORM("ETC2_SRGB_U8_NORM")
ETC2_SRGBA_U8_NORM = NewETC2_SRGBA_U8_NORM("ETC2_SRGBA_U8_NORM")
ETC2_SRGBA_U8U8U8U1_NORM = NewETC2_SRGBA_U8U8U8U1_NORM("ETC2_SRGBA_U8U8U8U1_NORM")
ETC2_R_U11_NORM = NewETC2_R_U11_NORM("ETC2_R_U11_NORM")
ETC2_RG_U11_NORM = NewETC2_RG_U11_NORM("ETC2_RG_U11_NORM")
ETC2_R_S11_NORM = NewETC2_R_S11_NORM("ETC2_R_S11_NORM")
ETC2_RG_S11_NORM = NewETC2_RG_S11_NORM("ETC2_RG_S11_NORM")
)
// NewETC2_RGB_U8_NORM returns a format representing the COMPRESSED_RGB8_ETC2
// block texture compression format.
func NewETC2_RGB_U8_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbU8Norm{&FmtETC2_RGB_U8_NORM{}}}
}
// NewETC2_SRGB_U8_NORM returns a format representing the COMPRESSED_SRGB8_ETC2
// block texture compression format.
func NewETC2_SRGB_U8_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbU8Norm{&FmtETC2_RGB_U8_NORM{Srgb: true}}}
}
func (f *FmtETC2_RGB_U8_NORM) key() interface{} {
return "ETC2_RGB_U8_NORM"
}
func (*FmtETC2_RGB_U8_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4)) / 2
}
func (f *FmtETC2_RGB_U8_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_RGB_U8_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red, stream.Channel_Green, stream.Channel_Blue}
}
// NewETC2_RGBA_U8_NORM returns a format representing the
// COMPRESSED_RGBA8_ETC2_EAC block texture compression format.
func NewETC2_RGBA_U8_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbaU8Norm{&FmtETC2_RGBA_U8_NORM{}}}
}
// NewETC2_SRGBA_U8_NORM returns a format representing the
// COMPRESSED_SRGBA8_ETC2_EAC block texture compression format.
func NewETC2_SRGBA_U8_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbaU8Norm{&FmtETC2_RGBA_U8_NORM{Srgb: true}}}
}
func (f *FmtETC2_RGBA_U8_NORM) key() interface{} {
return "ETC2_RGBA_U8_NORM"
}
func (*FmtETC2_RGBA_U8_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4))
}
func (f *FmtETC2_RGBA_U8_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_RGBA_U8_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red, stream.Channel_Green, stream.Channel_Blue, stream.Channel_Alpha}
}
// NewETC2_RGBA_U8U8U8U1_NORM returns a format representing the
// COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 block texture compression format.
func NewETC2_RGBA_U8U8U8U1_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbaU8U8U8U1Norm{&FmtETC2_RGBA_U8U8U8U1_NORM{}}}
}
// NewETC2_SRGBA_U8U8U8U1_NORM returns a format representing the
// COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 block texture compression format.
func NewETC2_SRGBA_U8U8U8U1_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgbaU8U8U8U1Norm{&FmtETC2_RGBA_U8U8U8U1_NORM{Srgb: true}}}
}
func (f *FmtETC2_RGBA_U8U8U8U1_NORM) key() interface{} {
return "ETC2_RGBA_U8U8U8U1_NORM"
}
func (*FmtETC2_RGBA_U8U8U8U1_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4)) / 2
}
func (f *FmtETC2_RGBA_U8U8U8U1_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_RGBA_U8U8U8U1_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red, stream.Channel_Green, stream.Channel_Blue, stream.Channel_Alpha}
}
// NewETC2_R_U11_NORM returns a format representing the COMPRESSED_R11_EAC
// block texture compression format.
func NewETC2_R_U11_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RU11Norm{&FmtETC2_R_U11_NORM{}}}
}
func (f *FmtETC2_R_U11_NORM) key() interface{} {
return "ETC2_R_U11_NORM"
}
func (*FmtETC2_R_U11_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4)) / 2
}
func (f *FmtETC2_R_U11_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_R_U11_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red}
}
// NewETC2_RG_U11_NORM returns a format representing the COMPRESSED_RG11_EAC
// block texture compression format.
func NewETC2_RG_U11_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgU11Norm{&FmtETC2_RG_U11_NORM{}}}
}
func (f *FmtETC2_RG_U11_NORM) key() interface{} {
return "ETC2_RG_U11_NORM"
}
func (*FmtETC2_RG_U11_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4))
}
func (f *FmtETC2_RG_U11_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_RG_U11_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red, stream.Channel_Green}
}
// NewETC2_R_S11_NORM returns a format representing the
// COMPRESSED_SIGNED_R11_EAC block texture compression format.
func NewETC2_R_S11_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RS11Norm{&FmtETC2_R_S11_NORM{}}}
}
func (f *FmtETC2_R_S11_NORM) key() interface{} {
return "ETC2_R_S11_NORM"
}
func (*FmtETC2_R_S11_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4)) / 2
}
func (f *FmtETC2_R_S11_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_R_S11_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red}
}
// NewETC2_RG_S11_NORM returns a format representing the COMPRESSED_RG11_EAC
// block texture compression format.
func NewETC2_RG_S11_NORM(name string) *Format {
return &Format{Name: name, Format: &Format_Etc2RgS11Norm{&FmtETC2_RG_S11_NORM{}}}
}
func (f *FmtETC2_RG_S11_NORM) key() interface{} {
return "ETC2_RG_S11_NORM"
}
func (*FmtETC2_RG_S11_NORM) size(w, h, d int) int {
return d * (sint.Max(sint.AlignUp(w, 4), 4) * sint.Max(sint.AlignUp(h, 4), 4))
}
func (f *FmtETC2_RG_S11_NORM) check(data []byte, w, h, d int) error {
return checkSize(data, f, w, h, d)
}
func (*FmtETC2_RG_S11_NORM) channels() stream.Channels {
return stream.Channels{stream.Channel_Red, stream.Channel_Green}
}
func init() {
RegisterConverter(ETC2_RGB_U8_NORM, RGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlphaNone)
})
RegisterConverter(ETC2_RGBA_U8_NORM, RGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlpha8Bit)
})
RegisterConverter(ETC2_RGBA_U8U8U8U1_NORM, RGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlpha1Bit)
})
RegisterConverter(ETC2_SRGB_U8_NORM, SRGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlphaNone)
})
RegisterConverter(ETC2_SRGBA_U8_NORM, SRGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlpha8Bit)
})
RegisterConverter(ETC2_SRGBA_U8U8U8U1_NORM, SRGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETC(src, w, h, d, etcAlpha1Bit)
})
RegisterConverter(ETC2_R_U11_NORM, R_U16_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETCU11(src, w, h, d, 1)
})
RegisterConverter(ETC2_RG_U11_NORM, RG_U16_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETCU11(src, w, h, d, 2)
})
RegisterConverter(ETC2_R_S11_NORM, R_S16_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETCS11(src, w, h, d, 1)
})
RegisterConverter(ETC2_RG_S11_NORM, RG_S16_NORM, func(src []byte, w, h, d int) ([]byte, error) {
return decodeETCS11(src, w, h, d, 2)
})
for _, conv := range []struct {
src, dst *Format
}{
{ETC2_RGB_U8_NORM, RGB_U8_NORM},
{ETC2_RGBA_U8_NORM, RGBA_U8_NORM},
{ETC2_RGBA_U8U8U8U1_NORM, RGBA_U8_NORM},
{ETC2_SRGB_U8_NORM, SRGBA_U8_NORM},
{ETC2_SRGBA_U8_NORM, SRGBA_U8_NORM},
{ETC2_SRGBA_U8U8U8U1_NORM, SRGBA_U8_NORM},
{ETC2_R_U11_NORM, R_U16_NORM},
{ETC2_RG_U11_NORM, RG_U16_NORM},
{ETC2_R_S11_NORM, R_S16_NORM},
{ETC2_RG_S11_NORM, RG_S16_NORM},
} {
conv := conv
if !registered(conv.src, RGB_U8_NORM) {
RegisterConverter(conv.src, RGB_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
rgb, err := Convert(src, w, h, d, conv.src, conv.dst)
if err != nil {
return nil, err
}
return Convert(rgb, w, h, d, conv.dst, RGB_U8_NORM)
})
}
if !registered(conv.src, RGBA_U8_NORM) {
RegisterConverter(conv.src, RGBA_U8_NORM, func(src []byte, w, h, d int) ([]byte, error) {
rgba, err := Convert(src, w, h, d, conv.src, conv.dst)
if err != nil {
return nil, err
}
return Convert(rgba, w, h, d, conv.dst, RGBA_U8_NORM)
})
}
}
}
func decodeETCBaseMulModTbl(v uint64) (base, mul int, modTbl [8]int) {
alphaModTbl := [16][8]int{
{-3, -6, -9, -15, 2, 5, 8, 14},
{-3, -7, -10, -13, 2, 6, 9, 12},
{-2, -5, -8, -13, 1, 4, 7, 12},
{-2, -4, -6, -13, 1, 3, 5, 12},
{-3, -6, -8, -12, 2, 5, 7, 11},
{-3, -7, -9, -11, 2, 6, 8, 10},
{-4, -7, -8, -11, 3, 6, 7, 10},
{-3, -5, -8, -11, 2, 4, 7, 10},
{-2, -6, -8, -10, 1, 5, 7, 9},
{-2, -5, -8, -10, 1, 4, 7, 9},
{-2, -4, -8, -10, 1, 3, 7, 9},
{-2, -5, -7, -10, 1, 4, 6, 9},
{-3, -4, -7, -10, 2, 3, 6, 9},
{-1, -2, -3, -10, 0, 1, 2, 9},
{-4, -6, -8, -9, 3, 5, 7, 8},
{-3, -5, -7, -9, 2, 4, 6, 8},
}
// βββββββββββββββββββββββββ³ββββββββββββ³ββββββββββββ
// β Base βMultiplier βTable Indexβ
// β£βββ―βββ―βββ―βββ―βββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―βββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββ
// ββββ΄βββ΄βββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ
return int(v >> 56),
int((v >> 52) & 15),
alphaModTbl[(v>>48)&15]
}
type etcAlphaMode int
const (
etcAlphaNone = etcAlphaMode(iota)
etcAlpha8Bit
etcAlpha1Bit
)
func decodeETC(src []byte, width, height, depth int, alphaMode etcAlphaMode) ([]byte, error) {
dst := make([]byte, width*height*depth*4)
blockWidth := sint.Max((width+3)/4, 1)
blockHeight := sint.Max((height+3)/4, 1)
const (
R = 0
G = 1
B = 2
)
c := [4][3]int{}
codes := [2][4]int{}
modTbl0 := [2][8][4]int{ // differential mode
{ // when opaque == 0:
{0, 8, 0, -8},
{0, 17, 0, -17},
{0, 29, 0, -29},
{0, 42, 0, -42},
{0, 60, 0, -60},
{0, 80, 0, -80},
{0, 106, 0, -106},
{0, 183, 0, -183},
}, { // when opaque == 1:
{2, 8, -2, -8},
{5, 17, -5, -17},
{9, 29, -9, -29},
{13, 42, -13, -42},
{18, 60, -18, -60},
{24, 80, -24, -80},
{33, 106, -33, -106},
{47, 183, -47, -183},
},
}
modTbl1 := [8]int{3, 6, 11, 16, 23, 32, 41, 64}
diffTbl := [8]int{0, 1, 2, 3, -4, -3, -2, -1}
flipTbl := [2][16]int{
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1},
{0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1},
}
alpha := [16]byte{
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
}
r := endian.Reader(bytes.NewReader(src), device.BigEndian)
for z := 0; z < depth; z++ {
dst := dst[z*width*height*4:]
for by := 0; by < blockHeight; by++ {
for bx := 0; bx < blockWidth; bx++ {
if alphaMode == etcAlpha8Bit {
v64 := r.Uint64()
base, mul, modTbl := decodeETCBaseMulModTbl(v64)
for i := uint8(0); i < 16; i++ {
mod := modTbl[(v64>>(i*3))&7]
alpha[15-i] = sint.Byte(base + mod*mul)
}
}
v64 := r.Uint64()
flip := (v64 >> 32) & 1
diff := (v64 >> 33) & 1
opaque := 1
if alphaMode == etcAlpha1Bit {
opaque = int(diff)
}
mode := uint(0)
for i := uint(0); i < 3; i++ {
if alphaMode != etcAlpha1Bit && diff == 0 {
// βββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³βββββββββ³βββββββββ³βββ³βββ
// β Rβ β Rβ β Gβ β Gβ β Bβ β Bβ β Cβ β Cβ βdfβfpβ
// β£βββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―ββββββ―βββ―βββββββββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββ
// ββββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββΈβββΈβββ
a := (v64 >> (60 - i*8)) & 15
b := (v64 >> (56 - i*8)) & 15
c[0][i] = int((a << 4) | a)
c[1][i] = int((b << 4) | b)
} else {
// ββββββββββββββββ³βββββββββ³βββββββββββββββ³βββββββββ³βββββββββββββββ³βββββββββ³βββββββββ³βββββββββ³βββ³βββ
// β Rβ βDelta Rββ Gβ βDelta Gββ Bβ βDelta Bββ Cβ β Cβ βdfβfpβ
// β£βββ―βββ―βββ―βββ―ββββββ―βββ―ββββββ―βββ―βββ―βββ―ββββββ―βββ―ββββββ―βββ―βββ―βββ―ββββββ―βββ―ββββββ―βββ―ββββββ―βββ―βββββββββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββ
// ββββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββΈβββΈβββ
a := (v64 >> (59 - i*8)) & 31
d := (v64 >> (56 - i*8)) & 7
b := int(a) + diffTbl[d]
if b < 0 || b > 31 {
mode = i + 1
break
}
c[0][i] = int((a << 3) | (a >> 2))
c[1][i] = int((b << 3) | (b >> 2))
}
}
switch mode {
case 0: // individual & differential mode (ETC1)
codes[0] = modTbl0[opaque][(v64>>37)&7]
codes[1] = modTbl0[opaque][(v64>>34)&7]
blockTbl := flipTbl[flip]
i := uint(0)
for x := bx * 4; x < (bx+1)*4; x++ {
for y := by * 4; y < (by+1)*4; y++ {
if x < width && y < height {
block := blockTbl[i]
k := 4 * (y*width + x)
idx := ((v64 >> i) & 1) | ((v64 >> (15 + i)) & 2)
if opaque == 0 && idx == 2 {
dst[k+2] = 0
dst[k+1] = 0
dst[k+0] = 0
dst[k+3] = 0
} else {
base := c[block]
shift := codes[block][idx]
dst[k+2] = sint.Byte(base[2] + shift)
dst[k+1] = sint.Byte(base[1] + shift)
dst[k+0] = sint.Byte(base[0] + shift)
dst[k+3] = alpha[i]
}
}
i++
}
}
case 1: // T-mode
// ββββββββββ³βββββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ
// β β Rβ ββββ β Gβ β Bβ β Rβ β Gβ β Bβ β ββββ β
// β£βββ―βββ―ββββββ―βββββββββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββββββββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββ
// ββββ΄βββ΄βββΈβββ΄βββΈβββΈβββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββΈβββΈβββ
// Load colors
c[0][R] = int(u64.Expand4to8(((v64 >> 57) & 12) | (v64>>56)&3))
c[0][G] = int(u64.Expand4to8(v64 >> 52))
c[0][B] = int(u64.Expand4to8(v64 >> 48))
c[2][R] = int(u64.Expand4to8(v64 >> 44))
c[2][G] = int(u64.Expand4to8(v64 >> 40))
c[2][B] = int(u64.Expand4to8(v64 >> 36))
// Load intensity modifier
modIdx := ((v64 >> 33) & 6) | ((v64 >> 32) & 1)
mod := modTbl1[modIdx]
// Calculate Cβ and cβ
for i := 0; i < 3; i++ {
c[1][i] = c[2][i] + mod
c[3][i] = c[2][i] - mod
}
// βββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ
// β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β
// β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β
// β£βββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―βββ«
// βββββββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββββββββ ββ ββ ββ ββ β
β ββ ββ ββ ββ ββ
// ββββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββ
// Use 2-bit indices to lookup texel colors
i := uint(0)
for x := bx * 4; x < (bx+1)*4; x++ {
for y := by * 4; y < (by+1)*4; y++ {
if x < width && y < height {
k := 4 * (y*width + x)
idx := ((v64 >> i) & 1) | ((v64 >> (15 + i)) & 2)
if opaque == 0 && idx == 2 {
dst[k+0] = 0
dst[k+1] = 0
dst[k+2] = 0
dst[k+3] = 0
} else {
dst[k+0] = sint.Byte(c[idx][0])
dst[k+1] = sint.Byte(c[idx][1])
dst[k+2] = sint.Byte(c[idx][2])
dst[k+3] = alpha[i]
}
}
i++
}
}
case 2: // H-mode
// ββββ³ββββββββββββ³βββββββββββββββββββββ³βββββββββββββββ³ββββββββββββ³ββββββββββββ³ββββββββββββ³βββββββββ
// β β Rβ β Gβ ββββββββββ β ββββ Bβ β Rβ β Gβ β Bβ βmdββββ β
// β£ββββββ―βββ―βββ―ββββββ―βββ―ββββββ―βββ―βββββββββββββββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββ―βββ―βββ―ββββββββββββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββ
// ββββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββΈβββ΄βββ΄βββΈβββΈβββΈβββΈβββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββΈβββΈβββΈβββ
// Load colors
c[0][R] = int(u64.Expand4to8(v64 >> 59))
c[0][G] = int(u64.Expand4to8(((v64 >> 55) & 14) | ((v64 >> 52) & 1)))
c[0][B] = int(u64.Expand4to8(((v64 >> 48) & 8) | ((v64 >> 47) & 7)))
c[2][R] = int(u64.Expand4to8(v64 >> 43))
c[2][G] = int(u64.Expand4to8(v64 >> 39))
c[2][B] = int(u64.Expand4to8(v64 >> 35))
// Load intensity modifier
modIdx := ((v64 >> 32) & 4) | ((v64 >> 31) & 2)
// LSB of modIdx is 1 if:
if (c[0][R]<<16)+(c[0][G]<<8)+c[0][B] >= (c[2][R]<<16)+(c[2][G]<<8)+c[2][B] {
modIdx++
}
mod := modTbl1[modIdx]
// Calculate Cβ and cβ
for i := 0; i < 3; i++ {
c[0][i], c[1][i] = c[0][i]+mod, c[0][i]-mod
c[2][i], c[3][i] = c[2][i]+mod, c[2][i]-mod
}
// βββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ³ββββββ
// β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β xβ β
// β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β yβ β
// β£βββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―ββββββ―βββ«
// βββββββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββββββββ ββ ββ ββ ββ β
β ββ ββ ββ ββ ββ
// ββββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββΈβββ΄βββ
// Use 2-bit indices to lookup texel colors
i := uint(0)
for x := bx * 4; x < (bx+1)*4; x++ {
for y := by * 4; y < (by+1)*4; y++ {
if x < width && y < height {
k := 4 * (y*width + x)
idx := ((v64 >> i) & 1) | ((v64 >> (15 + i)) & 2)
if opaque == 0 && idx == 2 {
dst[k+0] = 0
dst[k+1] = 0
dst[k+2] = 0
dst[k+3] = 0
} else {
dst[k+0] = sint.Byte(c[idx][0])
dst[k+1] = sint.Byte(c[idx][1])
dst[k+2] = sint.Byte(c[idx][2])
dst[k+3] = alpha[i]
}
}
i++
}
}
case 3: // planar-mode
// ββββ³ββββββββββββββββββ³ββββββββββββββββββββββββ³ββββββββββββββββββββββββββββββ³βββββββββββββββββββββ
// β β Rβ β ββββ Gβ β ββββββββββ Bβ ββββ β Rβ ββββ β
// β£ββββββ―βββ―βββ―βββ―βββ―ββββββββββββ―βββ―βββ―βββ―βββ―βββββββββ―βββ―ββββββ―βββββββββ―βββ―ββββββ―βββ―βββ―βββ―βββββββββ«
// ββββββββββββββ
βββ
βββ
βββ
βββ
β
ββ
βββ
βββ
βββ
βββ
ββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββ
// ββββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββΈβββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββΈβββ΄βββ΄βββΈβββ΄βββΈβββΈβββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββΈβββΈβββ
//
// ββββββββββββββββββββββ³ββββββββββββββββββ³ββββββββββββββββββ³βββββββββββββββββββββ³ββββββββββββββββββ
// β Gβ β Bβ β Rβ β Gβ β Bβ β
// β£βββ―βββ―βββ―βββ―βββ―βββ―ββββββ―βββ―βββ―βββ―βββ―ββββββ―βββ―βββ―βββ―βββ―ββββββ―βββ―βββ―βββ―βββ―βββ―ββββββ―βββ―βββ―βββ―βββ―βββ«
// βββββββββββββββββββββ
ββββββββββββββββββββββββββββββ
ββββββββββββββββ ββ ββ ββ ββ β
β ββ ββ ββ ββ ββ
// ββββ΄βββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββ΄βββΈβββ΄βββ΄βββ΄βββ΄βββ΄βββ
// Load colors
c[0][R] = int(u64.Expand6to8(v64 >> 57))
c[0][G] = int(u64.Expand7to8(((v64 >> 50) & 64) | ((v64 >> 49) & 63)))
c[0][B] = int(u64.Expand6to8(((v64 >> 43) & 32) | ((v64 >> 40) & 24) | ((v64 >> 39) & 7)))
c[1][R] = int(u64.Expand6to8(((v64 >> 33) & 62) | ((v64 >> 32) & 1)))
c[1][G] = int(u64.Expand7to8(v64 >> 25))
c[1][B] = int(u64.Expand6to8(v64 >> 19))
c[2][R] = int(u64.Expand6to8(v64 >> 13))
c[2][G] = int(u64.Expand7to8(v64 >> 6))
c[2][B] = int(u64.Expand6to8(v64))
i := 0
for dx := 0; dx < 4; dx++ {
x := bx*4 + dx
for dy := 0; dy < 4; dy++ {
y := by*4 + dy
if x < width && y < height {
k := 4 * (y*width + x)
dst[k+0] = sint.Byte((dx*(c[1][R]-c[0][R]) + dy*(c[2][R]-c[0][R]) + 4*c[0][R] + 2) >> 2)
dst[k+1] = sint.Byte((dx*(c[1][G]-c[0][G]) + dy*(c[2][G]-c[0][G]) + 4*c[0][G] + 2) >> 2)
dst[k+2] = sint.Byte((dx*(c[1][B]-c[0][B]) + dy*(c[2][B]-c[0][B]) + 4*c[0][B] + 2) >> 2)
dst[k+3] = alpha[i]
}
i++
}
}
}
}
}
}
return dst, nil
}
func decodeETCU11(src []byte, width, height, depth int, channels int) ([]byte, error) {
dst := make([]byte, width*height*depth*channels*2)
blockWidth := sint.Max((width+3)/4, 1)
blockHeight := sint.Max((height+3)/4, 1)
r := endian.Reader(bytes.NewReader(src), device.BigEndian)
for z := 0; z < depth; z++ {
dst := dst[z*width*height*channels*2:]
for by := 0; by < blockHeight; by++ {
for bx := 0; bx < blockWidth; bx++ {
for c := 0; c < channels; c++ {
v64 := r.Uint64()
base, mul, modTbl := decodeETCBaseMulModTbl(v64)
if mul != 0 {
mul *= 8
} else {
mul = 1
}
i := uint(15)
for x := bx * 4; x < bx*4+4; x++ {
for y := by * 4; y < by*4+4; y++ {
if x < width && y < height {
mod := modTbl[(v64>>(i*3))&7]
u11 := uint(sint.Clamp(base*8+4+mod*mul, 0, 2047))
u16 := (u11 << 5) | (u11 >> 5)
k := 2*channels*(y*width+x) + c*2
dst[k+0] = byte(u16)
dst[k+1] = byte(u16 >> 8)
}
i--
}
}
}
}
}
}
return dst, nil
}
func decodeETCS11(src []byte, width, height, depth int, channels int) ([]byte, error) {
dst := make([]byte, width*height*depth*channels*2)
blockWidth := sint.Max((width+3)/4, 1)
blockHeight := sint.Max((height+3)/4, 1)
r := endian.Reader(bytes.NewReader(src), device.BigEndian)
for z := 0; z < depth; z++ {
dst := dst[z*width*height*channels*2:]
for by := 0; by < blockHeight; by++ {
for bx := 0; bx < blockWidth; bx++ {
for c := 0; c < channels; c++ {
v64 := r.Uint64()
base, mul, modTbl := decodeETCBaseMulModTbl(v64)
base = int(int8(base))
if mul != 0 {
mul *= 8
} else {
mul = 1
}
i := uint(15)
for x := bx * 4; x < bx*4+4; x++ {
for y := by * 4; y < by*4+4; y++ {
if x < width && y < height {
mod := modTbl[(v64>>(i*3))&7]
s11 := sint.Clamp(base*8+mod*mul, -1023, 1023)
var s16 int
if s11 >= 0 {
s16 = (s11 << 5) | (s11 >> 5)
} else {
s16 = -((-s11 << 5) | (-s11 >> 5))
}
k := 2*channels*(y*width+x) + c*2
dst[k+0] = byte(s16)
dst[k+1] = byte(s16 >> 8)
}
i--
}
}
}
}
}
}
return dst, nil
}