// 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
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef INCLUDE_SPIRV_TOOLS_INSTRUMENT_HPP_
#define INCLUDE_SPIRV_TOOLS_INSTRUMENT_HPP_

// Shader Instrumentation Interface
//
// This file provides an external interface for applications that wish to
// communicate with shaders instrumented by passes created by:
//
//   CreateInstBindlessCheckPass
//   CreateInstBuffAddrCheckPass
//   CreateInstDebugPrintfPass
//
// More detailed documentation of these routines can be found in optimizer.hpp

namespace spvtools {

// Stream Output Buffer Offsets
//
// The following values provide offsets into the output buffer struct
// generated by InstrumentPass::GenDebugStreamWrite. This method is utilized
// by InstBindlessCheckPass, InstBuffAddrCheckPass, and InstDebugPrintfPass.
//
// The 1st member of the debug output buffer contains a set of flags
// controlling the behavior of instrumentation code.
static const int kDebugOutputFlagsOffset = 0;

// Values stored at kDebugOutputFlagsOffset
enum kInstFlags : unsigned int {
  kInstBufferOOBEnable = 0x1,
};

// The 2nd member 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 = 1;

// The 3rd member 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 = 2;

// 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 set of words of the
// record used to identify which instantiation of the shader generated the
// validation error.
//
// Vertex Shader Output Record Offsets
static const int kInstVertOutVertexIndex = kInstCommonOutCnt;
static const int kInstVertOutInstanceIndex = kInstCommonOutCnt + 1;
static const int kInstVertOutUnused = kInstCommonOutCnt + 2;

// Frag Shader Output Record Offsets
static const int kInstFragOutFragCoordX = kInstCommonOutCnt;
static const int kInstFragOutFragCoordY = kInstCommonOutCnt + 1;
static const int kInstFragOutUnused = kInstCommonOutCnt + 2;

// Compute Shader Output Record Offsets
static const int kInstCompOutGlobalInvocationIdX = kInstCommonOutCnt;
static const int kInstCompOutGlobalInvocationIdY = kInstCommonOutCnt + 1;
static const int kInstCompOutGlobalInvocationIdZ = kInstCommonOutCnt + 2;

// Tessellation Control Shader Output Record Offsets
static const int kInstTessCtlOutInvocationId = kInstCommonOutCnt;
static const int kInstTessCtlOutPrimitiveId = kInstCommonOutCnt + 1;
static const int kInstTessCtlOutUnused = kInstCommonOutCnt + 2;

// Tessellation Eval Shader Output Record Offsets
static const int kInstTessEvalOutPrimitiveId = kInstCommonOutCnt;
static const int kInstTessEvalOutTessCoordU = kInstCommonOutCnt + 1;
static const int kInstTessEvalOutTessCoordV = kInstCommonOutCnt + 2;

// Geometry Shader Output Record Offsets
static const int kInstGeomOutPrimitiveId = kInstCommonOutCnt;
static const int kInstGeomOutInvocationId = kInstCommonOutCnt + 1;
static const int kInstGeomOutUnused = kInstCommonOutCnt + 2;

// Ray Tracing Shader Output Record Offsets
static const int kInstRayTracingOutLaunchIdX = kInstCommonOutCnt;
static const int kInstRayTracingOutLaunchIdY = kInstCommonOutCnt + 1;
static const int kInstRayTracingOutLaunchIdZ = kInstCommonOutCnt + 2;

// Mesh Shader Output Record Offsets
static const int kInstMeshOutGlobalInvocationIdX = kInstCommonOutCnt;
static const int kInstMeshOutGlobalInvocationIdY = kInstCommonOutCnt + 1;
static const int kInstMeshOutGlobalInvocationIdZ = kInstCommonOutCnt + 2;

// Task Shader Output Record Offsets
static const int kInstTaskOutGlobalInvocationIdX = kInstCommonOutCnt;
static const int kInstTaskOutGlobalInvocationIdY = kInstCommonOutCnt + 1;
static const int kInstTaskOutGlobalInvocationIdZ = kInstCommonOutCnt + 2;

// Size of Common and Stage-specific Members
static const int kInstStageOutCnt = kInstCommonOutCnt + 3;

// 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,
// InstBuffAddrCheckPass, and possibly other future validations.
static const int kDebugOutputBindingStream = 0;

// The binding for the input buffer read by InstBindlessCheckPass.
static const int kDebugInputBindingBindless = 1;

// The binding for the input buffer read by InstBuffAddrCheckPass.
static const int kDebugInputBindingBuffAddr = 2;

// This is the output buffer written by InstDebugPrintfPass.
static const int kDebugOutputPrintfStream = 3;

}  // namespace spvtools

#endif  // INCLUDE_SPIRV_TOOLS_INSTRUMENT_HPP_