shaderir

Documentation

Overview

Package shaderir offers intermediate representation for shader programs.

Index

• func IsValidSwizzling(s string) bool
• type BasicType
• type Block
• type BuiltinFunc
  • func ParseBuiltinFunc(str string) (BuiltinFunc, bool)
• type ConstType
• type Expr
• type ExprType
• type FragmentFunc
• type Func
• type Op
  • func OpFromToken(t token.Token) (Op, bool)
• type Program
  • func (p *Program) LocalVariableType(topBlock, block *Block, idx int) Type
• type Stmt
• type StmtType
• type Type
  • func (t *Type) Equal(rhs *Type) bool
  • func (t *Type) FloatNum() int
  • func (t *Type) String() string
• type VertexFunc

Functions

func IsValidSwizzling

func IsValidSwizzling(s string) bool

Types

type BasicType

type BasicType int

const (
	None BasicType = iota
	Bool
	Int
	Float
	Vec2
	Vec3
	Vec4
	Mat2
	Mat3
	Mat4
	Array
	Struct
)

type Block

type Block struct {
	LocalVars           []Type
	LocalVarIndexOffset int
	Stmts               []Stmt
}

type BuiltinFunc

type BuiltinFunc string

const (
	Len         BuiltinFunc = "len"
	BoolF       BuiltinFunc = "bool"
	IntF        BuiltinFunc = "int"
	FloatF      BuiltinFunc = "float"
	Vec2F       BuiltinFunc = "vec2"
	Vec3F       BuiltinFunc = "vec3"
	Vec4F       BuiltinFunc = "vec4"
	Mat2F       BuiltinFunc = "mat2"
	Mat3F       BuiltinFunc = "mat3"
	Mat4F       BuiltinFunc = "mat4"
	Radians     BuiltinFunc = "radians"
	Degrees     BuiltinFunc = "degrees"
	Sin         BuiltinFunc = "sin"
	Cos         BuiltinFunc = "cos"
	Tan         BuiltinFunc = "tan"
	Asin        BuiltinFunc = "asin"
	Acos        BuiltinFunc = "acos"
	Atan        BuiltinFunc = "atan"
	Atan2       BuiltinFunc = "atan2"
	Pow         BuiltinFunc = "pow"
	Exp         BuiltinFunc = "exp"
	Log         BuiltinFunc = "log"
	Exp2        BuiltinFunc = "exp2"
	Log2        BuiltinFunc = "log2"
	Sqrt        BuiltinFunc = "sqrt"
	Inversesqrt BuiltinFunc = "inversesqrt"
	Abs         BuiltinFunc = "abs"
	Sign        BuiltinFunc = "sign"
	Floor       BuiltinFunc = "floor"
	Ceil        BuiltinFunc = "ceil"
	Fract       BuiltinFunc = "fract"
	Mod         BuiltinFunc = "mod"
	Min         BuiltinFunc = "min"
	Max         BuiltinFunc = "max"
	Clamp       BuiltinFunc = "clamp"
	Mix         BuiltinFunc = "mix"
	Step        BuiltinFunc = "step"
	Smoothstep  BuiltinFunc = "smoothstep"
	Length      BuiltinFunc = "length"
	Distance    BuiltinFunc = "distance"
	Dot         BuiltinFunc = "dot"
	Cross       BuiltinFunc = "cross"
	Normalize   BuiltinFunc = "normalize"
	Faceforward BuiltinFunc = "faceforward"
	Reflect     BuiltinFunc = "reflect"
	Transpose   BuiltinFunc = "transpose"
	Texture2DF  BuiltinFunc = "texture2D"
	Dfdx        BuiltinFunc = "dfdx"
	Dfdy        BuiltinFunc = "dfdy"
	Fwidth      BuiltinFunc = "fwidth"
)

func ParseBuiltinFunc

func ParseBuiltinFunc(str string) (BuiltinFunc, bool)

type ConstType

type ConstType int

const (
	ConstTypeNone ConstType = iota
	ConstTypeBool
	ConstTypeInt
	ConstTypeFloat
)

type Expr

type Expr struct {
	Type        ExprType
	Exprs       []Expr
	Const       constant.Value
	ConstType   ConstType
	BuiltinFunc BuiltinFunc
	Swizzling   string
	Index       int
	Op          Op
}

type ExprType

type ExprType int

const (
	Blank ExprType = iota
	NumberExpr
	UniformVariable
	TextureVariable
	LocalVariable
	StructMember
	BuiltinFuncExpr
	SwizzlingExpr
	FunctionExpr
	Unary
	Binary
	Selection
	Call
	FieldSelector
	Index
)

type FragmentFunc

type FragmentFunc struct {
	Block *Block
}

FragmentFunc takes pseudo params, and the number is len(varyings) + 2. If index == 0, the param represents the coordinate of the fragment (gl_FragCoord in GLSL). If index == len(varyings), the param represents (index-1)th verying variable. If index == len(varyings)+1, the param is an out-param representing the color of the pixel (gl_FragColor in GLSL).

type Func

type Func struct {
	Index     int
	InParams  []Type
	OutParams []Type
	Return    Type
	Block     *Block
}

type Op

type Op string

const (
	Add                Op = "+"
	Sub                Op = "-"
	NotOp              Op = "!"
	Mul                Op = "*"
	Div                Op = "/"
	ModOp              Op = "%"
	LeftShift          Op = "<<"
	RightShift         Op = ">>"
	LessThanOp         Op = "<"
	LessThanEqualOp    Op = "<="
	GreaterThanOp      Op = ">"
	GreaterThanEqualOp Op = ">="
	EqualOp            Op = "=="
	NotEqualOp         Op = "!="
	And                Op = "&"
	Xor                Op = "^"
	Or                 Op = "|"
	AndAnd             Op = "&&"
	OrOr               Op = "||"
)

func OpFromToken

func OpFromToken(t token.Token) (Op, bool)

type Program

type Program struct {
	UniformNames []string
	Uniforms     []Type
	TextureNum   int
	Attributes   []Type
	Varyings     []Type
	Funcs        []Func
	VertexFunc   VertexFunc
	FragmentFunc FragmentFunc
}

func (*Program) LocalVariableType

func (p *Program) LocalVariableType(topBlock, block *Block, idx int) Type

type Stmt

type Stmt struct {
	Type        StmtType
	Exprs       []Expr
	Blocks      []*Block
	ForVarType  Type
	ForVarIndex int
	ForInit     constant.Value
	ForEnd      constant.Value
	ForOp       Op
	ForDelta    constant.Value
	InitIndex   int
}

type StmtType

type StmtType int

const (
	ExprStmt StmtType = iota
	BlockStmt
	Assign
	Init
	If
	For
	Continue
	Break
	Return
	Discard
)

type Type

type Type struct {
	Main   BasicType
	Sub    []Type
	Length int
}

func (*Type) Equal

func (t *Type) Equal(rhs *Type) bool

func (*Type) FloatNum

func (t *Type) FloatNum() int

func (*Type) String

func (t *Type) String() string

type VertexFunc

type VertexFunc struct {
	Block *Block
}

VertexFunc takes pseudo params, and the number if len(attributes) + len(varyings) + 1. If 0 <= index < len(attributes), the params are in-params and represent attribute variables. If index == len(attributes), the param is an out-param and repesents the position in vec4 (gl_Position in GLSL) If len(attributes) + 1 <= index < len(attributes) + len(varyings) + 1, the params are out-params and represent varying variables.