1 /*
2 * Copyright (C) 2019 Collabora, Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include <stdio.h>
25 #include "pan_texture.h"
26
27 /* Translate a PIPE swizzle quad to a 12-bit Mali swizzle code. PIPE
28 * swizzles line up with Mali swizzles for the XYZW01, but PIPE swizzles have
29 * an additional "NONE" field that we have to mask out to zero. Additionally,
30 * PIPE swizzles are sparse but Mali swizzles are packed */
31
32 unsigned
panfrost_translate_swizzle_4(const unsigned char swizzle[4])33 panfrost_translate_swizzle_4(const unsigned char swizzle[4])
34 {
35 unsigned out = 0;
36
37 for (unsigned i = 0; i < 4; ++i) {
38 assert(swizzle[i] <= PIPE_SWIZZLE_1);
39 out |= (swizzle[i] << (3 * i));
40 }
41
42 return out;
43 }
44
45 void
panfrost_invert_swizzle(const unsigned char * in,unsigned char * out)46 panfrost_invert_swizzle(const unsigned char *in, unsigned char *out)
47 {
48 /* First, default to all zeroes to prevent uninitialized junk */
49
50 for (unsigned c = 0; c < 4; ++c)
51 out[c] = PIPE_SWIZZLE_0;
52
53 /* Now "do" what the swizzle says */
54
55 for (unsigned c = 0; c < 4; ++c) {
56 unsigned char i = in[c];
57
58 /* Who cares? */
59 assert(PIPE_SWIZZLE_X == 0);
60 if (i > PIPE_SWIZZLE_W)
61 continue;
62
63 /* Invert */
64 unsigned idx = i - PIPE_SWIZZLE_X;
65 out[idx] = PIPE_SWIZZLE_X + c;
66 }
67 }
68