105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// Copyright (c) Wojciech Figat. All rights reserved.
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#pragma once
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#include "ShaderFunctionReader.h"
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#include "Engine/Core/Math/Math.h"
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#if COMPILE_WITH_SHADER_COMPILER
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namespace ShaderProcessing
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{
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/// <summary>
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/// Hull Shaders reader
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/// </summary>
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class HullShaderFunctionReader : public ShaderFunctionReader<HullShaderMeta>
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{
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class PatchSizeReader : public ITokenReader
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{
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protected:
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HullShaderFunctionReader* _parent;
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Token _startToken;
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public:
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PatchSizeReader(HullShaderFunctionReader* parent)
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: _parent(parent)
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, _startToken("META_HS_PATCH")
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{
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}
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public:
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// [ITokenReader]
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bool CheckStartToken(const Token& token) override
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{
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return token == _startToken;
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}
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void Process(IShaderParser* parser, Reader& text) override
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{
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Token token;
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auto& current = _parent->_current;
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// Input control points count
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text.ReadToken(&token);
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token = parser->GetMacros().GetValue(token);
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int32 controlPointsCount;
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if (StringUtils::Parse(token.Start, token.Length, &controlPointsCount))
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{
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parser->OnError(TEXT("Cannot parse Hull shader input control points count."));
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return;
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}
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if (Math::IsNotInRange(controlPointsCount, 1, 32))
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{
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parser->OnError(TEXT("Invalid amount of control points. Valid range is [1-32]."));
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return;
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}
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current.ControlPointsCount = controlPointsCount;
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}
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};
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DECLARE_SHADER_META_READER_HEADER("META_HS", HS);
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HullShaderFunctionReader()
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{
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_childReaders.Add(New<PatchSizeReader>(this));
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_childReaders.Add(New<StripLineReader>("domain"));
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_childReaders.Add(New<StripLineReader>("partitioning"));
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_childReaders.Add(New<StripLineReader>("outputtopology"));
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_childReaders.Add(New<StripLineReader>("maxtessfactor"));
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_childReaders.Add(New<StripLineReader>("outputcontrolpoints"));
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_childReaders.Add(New<StripLineReader>("patchconstantfunc"));
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}
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~HullShaderFunctionReader()
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{
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}
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void OnParseBefore(IShaderParser* parser, Reader& text) override
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{
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// Clear current meta
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_current.ControlPointsCount = 0;
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// Base
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ShaderFunctionReader::OnParseBefore(parser, text);
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}
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void OnParseAfter(IShaderParser* parser, Reader& text) override
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{
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// Check if errors in parsed data
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if (_current.ControlPointsCount == 0)
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{
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parser->OnError(String::Format(TEXT("Hull Shader \'{0}\' has missing META_HS_PATCH macro that defines the amount of the input control points from the Input Assembler."), String(_current.Name)));
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return;
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}
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// Base
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ShaderFunctionReader::OnParseAfter(parser, text);
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}
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};
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}
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#endif
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