Documentation

Overview

Package shaderir offers intermediate representation for shader programs.

Index

Constants

This section is empty.

Variables

This section is empty.

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.

Source Files

Directories

Path Synopsis
glsl
metal