colorcube.rs revision 025b5f82971c431eb22df3c9d0f00b3cbe426bdb 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "ip.rsh"
18#pragma rs_fp_relaxed
19
20
21static rs_allocation gCube;
22static int4 gDims;
23static int4 gCoordMul;
24
25
26void setCube(rs_allocation c) {
27    gCube = c;
28    gDims.x = rsAllocationGetDimX(gCube);
29    gDims.y = rsAllocationGetDimY(gCube);
30    gDims.z = rsAllocationGetDimZ(gCube);
31    gDims.w = 0;
32
33    float4 m = (float4)(1.f / 255.f) * convert_float4(gDims - 1);
34    gCoordMul = convert_int4(m * (float4)0x10000);
35}
36
37uchar4 RS_KERNEL root(uchar4 in) {
38    int4 baseCoord = convert_int4(in) * gCoordMul;
39    int4 coord1 = baseCoord >> (int4)16;
40    int4 coord2 = min(coord1 + 1, gDims - 1);
41
42    int4 weight2 = baseCoord & 0xffff;
43    int4 weight1 = (int4)0x10000 - weight2;
44
45    uint4 v000 = convert_uint4(rsGetElementAt_uchar4(gCube, coord1.x, coord1.y, coord1.z));
46    uint4 v100 = convert_uint4(rsGetElementAt_uchar4(gCube, coord2.x, coord1.y, coord1.z));
47    uint4 v010 = convert_uint4(rsGetElementAt_uchar4(gCube, coord1.x, coord2.y, coord1.z));
48    uint4 v110 = convert_uint4(rsGetElementAt_uchar4(gCube, coord2.x, coord2.y, coord1.z));
49    uint4 v001 = convert_uint4(rsGetElementAt_uchar4(gCube, coord1.x, coord1.y, coord2.z));
50    uint4 v101 = convert_uint4(rsGetElementAt_uchar4(gCube, coord2.x, coord1.y, coord2.z));
51    uint4 v011 = convert_uint4(rsGetElementAt_uchar4(gCube, coord1.x, coord2.y, coord2.z));
52    uint4 v111 = convert_uint4(rsGetElementAt_uchar4(gCube, coord2.x, coord2.y, coord2.z));
53
54    uint4 yz00 = ((v000 * weight1.x) + (v100 * weight2.x)) >> (uint4)8;
55    uint4 yz10 = ((v010 * weight1.x) + (v110 * weight2.x)) >> (uint4)8;
56    uint4 yz01 = ((v001 * weight1.x) + (v101 * weight2.x)) >> (uint4)8;
57    uint4 yz11 = ((v011 * weight1.x) + (v111 * weight2.x)) >> (uint4)8;
58
59    uint4 z0 = ((yz00 * weight1.y) + (yz10 * weight2.y)) >> (uint4)16;
60    uint4 z1 = ((yz01 * weight1.y) + (yz11 * weight2.y)) >> (uint4)16;
61
62    uint4 v = ((z0 * weight1.z) + (z1 * weight2.z)) >> (uint4)16;
63    uint4 v2 = (v + 0x7f) >> (uint4)8;
64
65    uchar4 o = convert_uchar4(v2);
66    o.a = 0xff;
67    return o;
68}
69
70