src/panfrost/bifrost/bifrost.h

   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
  32 struct 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
  75 struct bifrost_fma_inst {
  76         unsigned src0 : 3;
  77         unsigned op   : 20;
  78 };
  79
  80 struct bifrost_add_inst {
  81         unsigned src0 : 3;
  82         unsigned op   : 17;
  83 };
  84
  85 #endif