430 lines
10 KiB
C++
430 lines
10 KiB
C++
/*************************************************************************/
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/* shader_language.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef SHADER_LANGUAGE_H
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#define SHADER_LANGUAGE_H
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#include "typedefs.h"
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#include "ustring.h"
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#include "list.h"
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#include "string_db.h"
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#include "map.h"
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#include "variant.h"
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class ShaderLanguage {
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public:
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enum TokenType {
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TK_EMPTY,
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TK_INDENTIFIER,
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TK_TRUE,
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TK_FALSE,
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TK_REAL_CONSTANT,
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TK_TYPE_VOID,
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TK_TYPE_BOOL,
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TK_TYPE_FLOAT,
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TK_TYPE_VEC2,
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TK_TYPE_VEC3,
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TK_TYPE_VEC4,
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TK_TYPE_MAT2,
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TK_TYPE_MAT3,
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TK_TYPE_MAT4,
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TK_TYPE_TEXTURE,
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TK_TYPE_CUBEMAP,
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TK_TYPE_COLOR,
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TK_OP_EQUAL,
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TK_OP_NOT_EQUAL,
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TK_OP_LESS,
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TK_OP_LESS_EQUAL,
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TK_OP_GREATER,
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TK_OP_GREATER_EQUAL,
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TK_OP_AND,
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TK_OP_OR,
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TK_OP_NOT,
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TK_OP_ADD,
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TK_OP_SUB,
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TK_OP_MUL,
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TK_OP_DIV,
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TK_OP_NEG,
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TK_OP_ASSIGN,
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TK_OP_ASSIGN_ADD,
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TK_OP_ASSIGN_SUB,
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TK_OP_ASSIGN_MUL,
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TK_OP_ASSIGN_DIV,
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TK_CF_IF,
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TK_CF_ELSE,
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TK_CF_RETURN,
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TK_BRACKET_OPEN,
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TK_BRACKET_CLOSE,
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TK_CURLY_BRACKET_OPEN,
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TK_CURLY_BRACKET_CLOSE,
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TK_PARENTHESIS_OPEN,
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TK_PARENTHESIS_CLOSE,
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TK_COMMA,
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TK_SEMICOLON,
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TK_PERIOD,
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TK_UNIFORM,
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TK_ERROR,
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TK_MAX
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};
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/* COMPILER */
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enum ShaderType {
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SHADER_MATERIAL_VERTEX,
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SHADER_MATERIAL_FRAGMENT,
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SHADER_MATERIAL_LIGHT,
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SHADER_CANVAS_ITEM_VERTEX,
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SHADER_CANVAS_ITEM_FRAGMENT,
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SHADER_CANVAS_ITEM_LIGHT,
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SHADER_POST_PROCESS,
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};
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enum DataType {
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TYPE_VOID,
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TYPE_BOOL,
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TYPE_FLOAT,
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TYPE_VEC2,
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TYPE_VEC3,
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TYPE_VEC4,
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TYPE_MAT2,
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TYPE_MAT3,
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TYPE_MAT4,
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TYPE_TEXTURE,
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TYPE_CUBEMAP,
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};
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enum Operator {
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OP_ASSIGN,
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OP_ADD,
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OP_SUB,
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OP_MUL,
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OP_DIV,
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OP_ASSIGN_ADD,
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OP_ASSIGN_SUB,
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OP_ASSIGN_MUL,
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OP_ASSIGN_DIV,
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OP_NEG,
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OP_NOT,
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OP_CMP_EQ,
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OP_CMP_NEQ,
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OP_CMP_LEQ,
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OP_CMP_GEQ,
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OP_CMP_LESS,
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OP_CMP_GREATER,
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OP_CMP_OR,
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OP_CMP_AND,
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OP_CALL,
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OP_CONSTRUCT,
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OP_MAX
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};
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enum FlowOperation {
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FLOW_OP_IF,
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FLOW_OP_RETURN,
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//FLOW_OP_FOR,
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//FLOW_OP_WHILE,
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//FLOW_OP_DO,
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//FLOW_OP_BREAK,
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//FLOW_OP_CONTINUE,
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};
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struct Node {
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enum Type {
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TYPE_PROGRAM,
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TYPE_FUNCTION,
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TYPE_BLOCK,
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TYPE_VARIABLE,
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TYPE_CONSTANT,
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TYPE_OPERATOR,
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TYPE_CONTROL_FLOW,
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TYPE_MEMBER
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};
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Node * parent;
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Type type;
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virtual DataType get_datatype() const { return TYPE_VOID; }
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virtual ~Node() {}
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};
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struct OperatorNode : public Node {
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DataType return_cache;
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Operator op;
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Vector<Node*> arguments;
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virtual DataType get_datatype() const { return return_cache; }
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OperatorNode() { type=TYPE_OPERATOR; return_cache=TYPE_VOID; }
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};
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struct VariableNode : public Node {
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bool uniform;
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DataType datatype_cache;
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StringName name;
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virtual DataType get_datatype() const { return datatype_cache; }
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VariableNode() { type=TYPE_VARIABLE; datatype_cache=TYPE_VOID; uniform=false; }
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};
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struct ConstantNode : public Node {
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DataType datatype;
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Variant value;
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virtual DataType get_datatype() const { return datatype; }
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ConstantNode() { type=TYPE_CONSTANT; }
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};
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struct BlockNode : public Node {
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Map<StringName,DataType> variables;
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List<Node*> statements;
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BlockNode() { type=TYPE_BLOCK; }
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};
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struct ControlFlowNode : public Node {
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FlowOperation flow_op;
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Vector<Node*> statements;
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ControlFlowNode() { type=TYPE_CONTROL_FLOW; flow_op=FLOW_OP_IF;}
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};
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struct MemberNode : public Node {
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DataType basetype;
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DataType datatype;
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StringName name;
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Node* owner;
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virtual DataType get_datatype() const { return datatype; }
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MemberNode() { type=TYPE_MEMBER; }
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};
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struct FunctionNode : public Node {
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struct Argument {
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StringName name;
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DataType type;
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};
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StringName name;
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DataType return_type;
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Vector<Argument> arguments;
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BlockNode *body;
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FunctionNode() { type=TYPE_FUNCTION; }
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};
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struct Uniform {
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int order;
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DataType type;
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Variant default_value;
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};
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struct ProgramNode : public Node {
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struct Function {
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StringName name;
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FunctionNode*function;
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};
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Map<StringName,DataType> builtin_variables;
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Map<StringName,Uniform> uniforms;
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Vector<Function> functions;
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BlockNode *body;
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ProgramNode() { type=TYPE_PROGRAM; }
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};
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struct Expression {
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bool is_op;
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union {
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TokenType op;
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Node *node;
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};
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};
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typedef Error (*CompileFunc)(void*,ProgramNode*);
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struct VarInfo {
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StringName name;
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DataType type;
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};
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private:
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static const char * token_names[TK_MAX];
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struct Token {
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TokenType type;
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StringName text;
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uint16_t line,col;
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Token(TokenType p_type=TK_EMPTY,const String& p_text=String()) { type=p_type; text=p_text; line=0; col=0; }
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};
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static Token read_token(const CharType* p_text,int p_len,int &r_line,int &r_chars);
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static Error tokenize(const String& p_text,Vector<Token> *p_tokens,String *r_error,int *r_err_line,int *r_err_column);
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class Parser {
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Vector<Token> tokens;
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int pos;
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String error;
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public:
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void set_error(const String& p_error) { error=p_error; }
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void get_error(String *r_error, int *r_line, int *r_column) {
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*r_error=error;
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*r_line=get_token(pos).line;
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*r_column=get_token(pos).col;
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}
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Token get_token(int ofs=0) const { int idx=pos+ofs; if (idx<0 || idx>=tokens.size()) return Token(TK_ERROR); return tokens[idx]; }
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TokenType get_token_type(int ofs=0) const { int idx=pos+ofs; if (idx<0 || idx>=tokens.size()) return TK_ERROR; return tokens[idx].type; }
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void advance(int p_amount=1) { pos+=p_amount; }
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bool is_at_end() const { return pos>=tokens.size(); }
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ProgramNode *program;
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template<class T>
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T* create_node(Node *p_parent) { T*n=memnew( T ); nodegc.push_back(n); n->parent=p_parent; return n; }
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List<Node*> nodegc;
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Parser(const Vector<Token>& p_tokens) { tokens=p_tokens; pos=0;}
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};
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struct IntrinsicFuncDef {
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enum { MAX_ARGS=5 };
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const char* name;
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DataType rettype;
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const DataType args[MAX_ARGS];
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};
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static const IntrinsicFuncDef intrinsic_func_defs[];
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struct OperatorDef {
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enum { MAX_ARGS=2 };
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Operator op;
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DataType rettype;
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const DataType args[MAX_ARGS];
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};
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static const OperatorDef operator_defs[];
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struct BuiltinsDef {
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const char* name;
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DataType type;
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};
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static const BuiltinsDef vertex_builtins_defs[];
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static const BuiltinsDef fragment_builtins_defs[];
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static const BuiltinsDef light_builtins_defs[];
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static const BuiltinsDef ci_vertex_builtins_defs[];
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static const BuiltinsDef ci_fragment_builtins_defs[];
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static const BuiltinsDef ci_light_builtins_defs[];
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static const BuiltinsDef postprocess_fragment_builtins_defs[];
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static DataType get_token_datatype(TokenType p_type);
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static String get_datatype_name(DataType p_type);
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static bool is_token_datatype(TokenType p_type);
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static bool is_token_nonvoid_datatype(TokenType p_type);
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static bool test_existing_identifier(Node *p_node,const StringName p_identifier,bool p_func=true,bool p_var=true,bool p_builtin=true);
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static bool parser_is_at_function(Parser& parser);
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static DataType compute_node_type(Node *p_node);
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static Node* validate_function_call(Parser&parser, OperatorNode *p_func);
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static Node* validate_operator(Parser& parser,OperatorNode *p_func);
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static bool is_token_operator(TokenType p_type);
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static Operator get_token_operator(TokenType p_type);
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static Error parse_expression(Parser& parser,Node *p_parent,Node **r_expr);
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static Error parse_variable_declaration(Parser& parser,BlockNode *p_block);
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static Error parse_function(Parser& parser,BlockNode *p_block);
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static Error parse_flow_if(Parser& parser,Node *p_parent,Node **r_statement);
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static Error parse_flow_return(Parser& parser,Node *p_parent,Node **r_statement);
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static Error parse_statement(Parser& parser,Node *p_parent,Node **r_statement);
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static Error parse_block(Parser& parser,BlockNode *p_block);
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static Error parse(const Vector<Token> &p_tokens,ShaderType p_type,CompileFunc p_compile_func,void *p_userdata,String *r_error,int *r_err_line,int *r_err_column);
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;
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public:
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static void get_keyword_list(ShaderType p_type,List<String> *p_keywords);
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static Error compile(const String& p_code,ShaderType p_type, CompileFunc p_compile_func,void *p_userdata,String *r_error,int *r_err_line,int *r_err_column);
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static String lex_debug(const String& p_code);
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};
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#endif // SHADER_LANGUAGE_H
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