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// Copyright (c) 2018 The Khronos Group Inc.
// Copyright (c) 2018 Valve Corporation
// Copyright (c) 2018 LunarG Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
// Shader Instrumentation Interface
// This file provides an external interface for applications that wish to
// communicate with shaders instrumented by passes created by:
// CreateInstBindlessCheckPass
// More detailed documentation of this routine can be found in optimizer.hpp
namespace spvtools {
// Stream Output Buffer Offsets
// The following values provide 32-bit word offsets into the output buffer
// generated by InstrumentPass::GenDebugStreamWrite. This method is utilized
// by InstBindlessCheckPass.
// The first word of the debug output buffer contains the next available word
// in the data stream to be written. Shaders will atomically read and update
// this value so as not to overwrite each others records. This value must be
// initialized to zero
static const int kDebugOutputSizeOffset = 0;
// The second word of the output buffer is the start of the stream of records
// written by the instrumented shaders. Each record represents a validation
// error. The format of the records is documented below.
static const int kDebugOutputDataOffset = 1;
// Common Stream Record Offsets
// The following are offsets to fields which are common to all records written
// to the output stream.
// Each record first contains the size of the record in 32-bit words, including
// the size word.
static const int kInstCommonOutSize = 0;
// This is the shader id passed by the layer when the instrumentation pass is
// created.
static const int kInstCommonOutShaderId = 1;
// This is the ordinal position of the instruction within the SPIR-V shader
// which generated the validation error.
static const int kInstCommonOutInstructionIdx = 2;
// This is the stage which generated the validation error. This word is used
// to determine the contents of the next two words in the record.
// 0:Vert, 1:TessCtrl, 2:TessEval, 3:Geom, 4:Frag, 5:Compute
static const int kInstCommonOutStageIdx = 3;
static const int kInstCommonOutCnt = 4;
// Stage-specific Stream Record Offsets
// Each stage will contain different values in the next two words of the record
// used to identify which instantiation of the shader generated the validation
// error.
// Vertex Shader Output Record Offsets
static const int kInstVertOutVertexId = kInstCommonOutCnt;
static const int kInstVertOutInstanceId = kInstCommonOutCnt + 1;
// Frag Shader Output Record Offsets
static const int kInstFragOutFragCoordX = kInstCommonOutCnt;
static const int kInstFragOutFragCoordY = kInstCommonOutCnt + 1;
// Compute Shader Output Record Offsets
static const int kInstCompOutGlobalInvocationId = kInstCommonOutCnt;
static const int kInstCompOutUnused = kInstCommonOutCnt + 1;
// Tessellation Shader Output Record Offsets
static const int kInstTessOutInvocationId = kInstCommonOutCnt;
static const int kInstTessOutUnused = kInstCommonOutCnt + 1;
// Geometry Shader Output Record Offsets
static const int kInstGeomOutPrimitiveId = kInstCommonOutCnt;
static const int kInstGeomOutInvocationId = kInstCommonOutCnt + 1;
// Size of Common and Stage-specific Members
static const int kInstStageOutCnt = kInstCommonOutCnt + 2;
// Validation Error Code
// This identifies the validation error. It also helps to identify
// how many words follow in the record and their meaning.
static const int kInstValidationOutError = kInstStageOutCnt;
// Validation-specific Output Record Offsets
// Each different validation will generate a potentially different
// number of words at the end of the record giving more specifics
// about the validation error.
// A bindless bounds error will output the index and the bound.
static const int kInstBindlessOutDescIndex = kInstStageOutCnt + 1;
static const int kInstBindlessOutDescBound = kInstStageOutCnt + 2;
static const int kInstBindlessOutCnt = kInstStageOutCnt + 3;
// Maximum Output Record Member Count
static const int kInstMaxOutCnt = kInstStageOutCnt + 3;
// Validation Error Codes
// These are the possible validation error codes.
static const int kInstErrorBindlessBounds = 0;
// Debug Buffer Bindings
// These are the bindings for the different buffers which are
// read or written by the instrumentation passes.
// This is the output buffer written by InstBindlessCheckPass.
static const int kDebugOutputBindingStream = 0;
} // namespace spvtools