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/*
* Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
* Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
* Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __bifrost_h__
#define __bifrost_h__
#include <stdint.h>
#include <stdbool.h>
struct bifrost_header {
unsigned unk0 : 7;
// If true, convert any infinite result of any floating-point operation to
// the biggest representable number.
unsigned suppress_inf: 1;
// Convert any NaN results to 0.
unsigned suppress_nan : 1;
unsigned unk1 : 2;
// true if the execution mask of the next clause is the same as the mask of
// the current clause.
unsigned back_to_back : 1;
unsigned no_end_of_shader: 1;
unsigned unk2 : 2;
// Set to true for fragment shaders, to implement this bit of spec text
// from section 7.1.5 of the GLSL ES spec:
//
// "Stores to image and buffer variables performed by helper invocations
// have no effect on the underlying image or buffer memory."
//
// Helper invocations are threads (invocations) corresponding to pixels in
// a quad that aren't actually part of the triangle, but are included to
// make derivatives work correctly. They're usually turned on, but they
// need to be masked off for GLSL-level stores. This bit seems to be the
// only bit that's actually different between fragment shaders and other
// shaders, so this is probably what it's doing.
unsigned elide_writes : 1;
// If backToBack is off:
// - true for conditional branches and fallthrough
// - false for unconditional branches
// The blob seems to always set it to true if back-to-back is on.
unsigned branch_cond : 1;
// This bit is set when the next clause writes to the data register of some
// previous clause.
unsigned datareg_writebarrier: 1;
unsigned datareg : 6;
unsigned scoreboard_deps: 8;
unsigned scoreboard_index: 3;
unsigned clause_type: 4;
unsigned unk3 : 1; // part of clauseType?
unsigned next_clause_type: 4;
unsigned unk4 : 1; // part of nextClauseType?
};
struct bifrost_fma_inst {
unsigned src0 : 3;
unsigned op : 20;
};
struct bifrost_add_inst {
unsigned src0 : 3;
unsigned op : 17;
};
enum bifrost_csel_cond {
BIFROST_FEQ_F = 0x0,
BIFROST_FGT_F = 0x1,
BIFROST_FGE_F = 0x2,
BIFROST_IEQ_F = 0x3,
BIFROST_IGT_I = 0x4,
BIFROST_IGE_I = 0x5,
BIFROST_UGT_I = 0x6,
BIFROST_UGE_I = 0x7
};
struct bifrost_csel4 {
unsigned src0 : 3;
unsigned src1 : 3;
unsigned src2 : 3;
unsigned src3 : 3;
enum bifrost_csel_cond cond : 3;
unsigned op : 8;
};
struct bifrost_shift_fma {
unsigned src0 : 3;
unsigned src1 : 3;
unsigned src2 : 3;
unsigned half : 3; /* 000 for i32, 100 for i8, 111 for v2i16 */
unsigned unk : 1; /* always set? */
unsigned invert_1 : 1; /* Inverts sources to combining op */
/* For XOR, switches RSHIFT to LSHIFT since only one invert needed */
unsigned invert_2 : 1;
unsigned op : 8;
};
#endif
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