bifrost.h revision b8e80941 
1/*
2 * Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
3 * Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
4 * Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26#ifndef __bifrost_h__
27#define __bifrost_h__
28
29#include <stdint.h>
30#include <stdbool.h>
31
32struct bifrost_header {
33        unsigned unk0 : 7;
34        // If true, convert any infinite result of any floating-point operation to
35        // the biggest representable number.
36        unsigned suppress_inf: 1;
37        // Convert any NaN results to 0.
38        unsigned suppress_nan : 1;
39        unsigned unk1 : 2;
40        // true if the execution mask of the next clause is the same as the mask of
41        // the current clause.
42        unsigned back_to_back : 1;
43        unsigned no_end_of_shader: 1;
44        unsigned unk2 : 2;
45        // Set to true for fragment shaders, to implement this bit of spec text
46        // from section 7.1.5 of the GLSL ES spec:
47        //
48        // "Stores to image and buffer variables performed by helper invocations
49        // have no effect on the underlying image or buffer memory."
50        //
51        // Helper invocations are threads (invocations) corresponding to pixels in
52        // a quad that aren't actually part of the triangle, but are included to
53        // make derivatives work correctly. They're usually turned on, but they
54        // need to be masked off for GLSL-level stores. This bit seems to be the
55        // only bit that's actually different between fragment shaders and other
56        // shaders, so this is probably what it's doing.
57        unsigned elide_writes : 1;
58        // If backToBack is off:
59        // - true for conditional branches and fallthrough
60        // - false for unconditional branches
61        // The blob seems to always set it to true if back-to-back is on.
62        unsigned branch_cond : 1;
63        // This bit is set when the next clause writes to the data register of some
64        // previous clause.
65        unsigned datareg_writebarrier: 1;
66        unsigned datareg : 6;
67        unsigned scoreboard_deps: 8;
68        unsigned scoreboard_index: 3;
69        unsigned clause_type: 4;
70        unsigned unk3 : 1; // part of clauseType?
71        unsigned next_clause_type: 4;
72        unsigned unk4 : 1; // part of nextClauseType?
73};
74
75struct bifrost_fma_inst {
76        unsigned src0 : 3;
77        unsigned op   : 20;
78};
79
80struct bifrost_add_inst {
81        unsigned src0 : 3;
82        unsigned op   : 17;
83};
84
85#endif
86