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ShaderLang: Proof of concept (add support for a lot of things)

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This commit is contained in:
Jérôme Leclercq
2021-03-31 10:21:35 +02:00
parent 2a73005295
commit c1d1838336
37 changed files with 2259 additions and 908 deletions
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27
include/Nazara/Shader/ShaderLangParser.hpp
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@@ -19,6 +19,12 @@ namespace Nz::ShaderLang
public:
using exception::exception;
};
class DuplicateIdentifier : public std::exception
{
public:
using exception::exception;
};
class ReservedKeyword : public std::exception
{
@@ -56,17 +62,24 @@ namespace Nz::ShaderLang
// Flow control
const Token& Advance();
void Consume(std::size_t count = 1);
ShaderAst::ExpressionType DecodeType(const std::string& identifier);
void EnterScope();
const Token& Expect(const Token& token, TokenType type);
const Token& ExpectNot(const Token& token, TokenType type);
const Token& Expect(TokenType type);
void LeaveScope();
bool IsVariableInScope(const std::string_view& identifier) const;
void RegisterVariable(std::string identifier);
const Token& Peek(std::size_t advance = 0);
void HandleAttributes();
std::vector<ShaderAst::Attribute> ParseAttributes();
// Statements
ShaderAst::StatementPtr ParseExternalBlock(std::vector<ShaderAst::Attribute> attributes = {});
std::vector<ShaderAst::StatementPtr> ParseFunctionBody();
ShaderAst::StatementPtr ParseFunctionDeclaration(std::vector<ShaderAst::Attribute> attributes = {});
ShaderAst::DeclareFunctionStatement::Parameter ParseFunctionParameter();
ShaderAst::StatementPtr ParseStructDeclaration(std::vector<ShaderAst::Attribute> attributes = {});
ShaderAst::StatementPtr ParseReturnStatement();
ShaderAst::StatementPtr ParseStatement();
std::vector<ShaderAst::StatementPtr> ParseStatementList();
@@ -75,22 +88,28 @@ namespace Nz::ShaderLang
// Expressions
ShaderAst::ExpressionPtr ParseBinOpRhs(int exprPrecedence, ShaderAst::ExpressionPtr lhs);
ShaderAst::ExpressionPtr ParseExpression();
ShaderAst::ExpressionPtr ParseFloatingPointExpression(bool minus = false);
ShaderAst::ExpressionPtr ParseIdentifier();
ShaderAst::ExpressionPtr ParseIntegerExpression();
ShaderAst::ExpressionPtr ParseIntegerExpression(bool minus = false);
std::vector<ShaderAst::ExpressionPtr> ParseParameters();
ShaderAst::ExpressionPtr ParseParenthesisExpression();
ShaderAst::ExpressionPtr ParsePrimaryExpression();
ShaderAst::ExpressionPtr ParseVariableAssignation();
ShaderAst::AttributeType ParseIdentifierAsAttributeType();
const std::string& ParseIdentifierAsName();
ShaderAst::ShaderExpressionType ParseIdentifierAsType();
ShaderAst::PrimitiveType ParsePrimitiveType();
ShaderAst::ExpressionType ParseType();
static int GetTokenPrecedence(TokenType token);
struct Context
{
std::unique_ptr<ShaderAst::MultiStatement> root;
std::size_t tokenCount;
std::size_t tokenIndex = 0;
std::vector<std::size_t> scopeSizes;
std::vector<std::string> identifiersInScope;
std::unique_ptr<ShaderAst::MultiStatement> root;
const Token* tokens;
};