| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // 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 "android.googlesource.com/platform/tools/gpu/binary" |
| |
| type fmtATC_RGB_AMD struct{} |
| |
| func (fmtATC_RGB_AMD) String() string { return "ATC_RGB_AMD" } |
| func (fmtATC_RGB_AMD) Check(d []byte, w, h int) error { |
| return checkSize(d, max(w, 4), max(h, 4), 4) |
| } |
| |
| type fmtATC_RGBA_EXPLICIT_ALPHA_AMD struct{} |
| |
| func (fmtATC_RGBA_EXPLICIT_ALPHA_AMD) String() string { return "ATC_RGBA_EXPLICIT_ALPHA_AMD" } |
| func (fmtATC_RGBA_EXPLICIT_ALPHA_AMD) Check(d []byte, w, h int) error { |
| return checkSize(d, max(w, 4), max(h, 4), 8) |
| } |
| |
| // ATC_RGB_AMD returns a format representing the texture compression format with |
| // the same name. |
| func ATC_RGB_AMD() Format { return fmtATC_RGB_AMD{} } |
| |
| // ATC_RGBA_EXPLICIT_ALPHA_AMD returns a format representing the texture |
| // compression format with the same name. |
| func ATC_RGBA_EXPLICIT_ALPHA_AMD() Format { return fmtATC_RGBA_EXPLICIT_ALPHA_AMD{} } |
| |
| func init() { |
| RegisterConverter(ATC_RGB_AMD(), RGBA(), |
| func(src []byte, width, height int) ([]byte, error) { |
| dst, j := make([]byte, width*height*4), 0 |
| |
| block_width := max(width/4, 1) |
| block_height := max(height/4, 1) |
| |
| bs := binary.BitStream{Data: src} |
| |
| c := [4][3]uint32{ |
| {0, 0, 0}, |
| {0, 0, 0}, |
| {0, 0, 0}, |
| {0, 0, 0}, |
| } |
| |
| for by := 0; by < block_height; by++ { |
| for bx := 0; bx < block_width; bx++ { |
| c[0][2] = bs.Read(5) << 3 |
| c[0][1] = bs.Read(5) << 3 |
| c[0][0] = bs.Read(5) << 3 |
| alt := bs.ReadBit() != 0 |
| c[3][2] = bs.Read(5) << 3 |
| c[3][1] = bs.Read(6) << 2 |
| c[3][0] = bs.Read(5) << 3 |
| for i := 0; i < 3; i++ { |
| if alt { |
| c[2][i] = c[0][i] |
| c[1][i] = c[0][i] - c[3][i]/4 |
| c[0][i] = 0 |
| } else { |
| c[1][i] = (c[0][i]*2 + c[3][i]*1) / 3 |
| c[2][i] = (c[0][i]*1 + c[3][i]*2) / 3 |
| } |
| } |
| for y := by * 4; y < (by+1)*4; y++ { |
| for x := bx * 4; x < (bx+1)*4; x++ { |
| idx := bs.Read(2) |
| if x < width && y < height { |
| j = 4 * (y*width + x) |
| dst[j+0] = uint8(c[idx][0]) |
| dst[j+1] = uint8(c[idx][1]) |
| dst[j+2] = uint8(c[idx][2]) |
| dst[j+3] = 255 |
| } |
| } |
| } |
| } |
| } |
| |
| return dst, nil |
| }) |
| |
| RegisterConverter(ATC_RGBA_EXPLICIT_ALPHA_AMD(), RGBA(), |
| func(src []byte, width, height int) ([]byte, error) { |
| dst, j := make([]byte, width*height*4), 0 |
| |
| block_width := max(width/4, 1) |
| block_height := max(height/4, 1) |
| |
| bs := binary.BitStream{Data: src} |
| |
| a := [16]uint8{ |
| 0, 0, 0, 0, |
| 0, 0, 0, 0, |
| 0, 0, 0, 0, |
| 0, 0, 0, 0, |
| } |
| |
| c := [4][3]uint32{ |
| {0, 0, 0}, |
| {0, 0, 0}, |
| {0, 0, 0}, |
| {0, 0, 0}, |
| } |
| |
| for by := 0; by < block_height; by++ { |
| for bx := 0; bx < block_width; bx++ { |
| for i := 0; i < 16; i++ { |
| a[i] = uint8(bs.Read(4) << 4) |
| } |
| c[0][2] = bs.Read(5) << 3 |
| c[0][1] = bs.Read(5) << 3 |
| c[0][0] = bs.Read(5) << 3 |
| bs.ReadBit() |
| c[3][2] = bs.Read(5) << 3 |
| c[3][1] = bs.Read(6) << 2 |
| c[3][0] = bs.Read(5) << 3 |
| for i := 0; i < 3; i++ { |
| c[1][i] = (c[0][i]*2 + c[3][i]*1) / 3 |
| c[2][i] = (c[0][i]*1 + c[3][i]*2) / 3 |
| } |
| p := 0 |
| for y := by * 4; y < (by+1)*4; y++ { |
| for x := bx * 4; x < (bx+1)*4; x++ { |
| idx := bs.Read(2) |
| if x < width && y < height { |
| j = 4 * (y*width + x) |
| dst[j+0] = uint8(c[idx][0]) |
| dst[j+1] = uint8(c[idx][1]) |
| dst[j+2] = uint8(c[idx][2]) |
| dst[j+3] = a[p] |
| p++ |
| } |
| } |
| } |
| } |
| } |
| |
| return dst, nil |
| }) |
| } |