1// Copyright 2019 The Android Open Source Project
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#version 450
16#include "Etc2ShaderLib.comp"
17
18layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
19
20layout(push_constant) uniform ImageFormatBlock {
21    uint compFormat;
22    uint baseLayer;
23}
24u_pushConstant;
25
26layout(binding = 0, rgba16ui) readonly uniform WITH_TYPE(uimage) u_image0;
27layout(binding = 1, rgba8ui) writeonly uniform WITH_TYPE(uimage) u_image1;
28
29void main(void) {
30    ivec3 pos = ivec3(gl_GlobalInvocationID.xyz);
31    pos.z += int(u_pushConstant.baseLayer);
32    ivec4 srcBlock = ivec4(imageLoad(u_image0, WITH_TYPE(getPos)(pos)));
33
34    bool isPunchthroughAlpha = (u_pushConstant.compFormat == VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK ||
35                                u_pushConstant.compFormat == VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK);
36
37    ivec4[16] decompressed =
38        etc2_decode_rgb_block(constructUint32(srcBlock[0], srcBlock[1]),
39                              constructUint32(srcBlock[2], srcBlock[3]), isPunchthroughAlpha);
40
41    for (int y = 0; y < WITH_TYPE(BLOCK_Y_SIZE_); y++) {
42        for (int x = 0; x < 4; x++) {
43            imageStore(u_image1, WITH_TYPE(getPos)(ivec3(pos.xy * 4 + ivec2(x, y), pos.z)),
44                       decompressed[y * 4 + x]);
45        }
46    }
47}
48