mirror of
https://github.com/hajimehoshi/ebiten.git
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145 lines
2.8 KiB
Go
145 lines
2.8 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package shaderir offers intermediate representation for shader programs.
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package shaderir
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type Program struct {
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Uniforms []Type
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Attributes []Type
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Varyings []Type
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Funcs []Func
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VertexFunc VertexFunc
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FragmentFunc FragmentFunc
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structNames map[string]string
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structTypes []Type
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}
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// TODO: How to avoid the name with existing functions?
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type Func struct {
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Name string
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InParams []Type
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InOutParams []Type
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OutParams []Type
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Return Type
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Block Block
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}
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// VertexFunc takes pseudo params, and the number if len(attributes) + len(varyings) + 1.
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// If 0 <= index < len(attributes), the params are in-params and treated as attribute variables.
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// If len(attributes) <= index < len(attributes) + len(varyings), the params are out-params and treated as varying
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// variables.
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// The last param represents the position in vec4 (gl_Position in GLSL).
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type VertexFunc struct {
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Block Block
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}
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// FragmentFunc takes pseudo in-params, and the number is len(varyings) + 1.
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// The last param represents the coordinate of the fragment (gl_FragCoord in GLSL)
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type FragmentFunc struct {
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Block Block
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}
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type Block struct {
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LocalVars []Type
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Stmts []Stmt
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}
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type Stmt struct {
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Type StmtType
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Exprs []Expr
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Blocks []Block
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ForInit int
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ForEnd int
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ForOp Op
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ForDelta int
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}
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type StmtType int
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const (
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ExprStmt StmtType = iota
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BlockStmt
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Assign
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If
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For
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Continue
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Break
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Return
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Discard
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)
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type Expr struct {
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Type ExprType
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Exprs []Expr
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Variable Variable
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Int int32
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Float float32
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Ident string
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Op Op
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}
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type ExprType int
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const (
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IntExpr ExprType = iota
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FloatExpr
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VarName
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Ident
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Unary
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Binary
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Selection
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Call
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FieldSelector
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Index
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)
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type Variable struct {
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Type VariableType
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Index int
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}
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type VariableType int
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const (
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Uniform VariableType = iota
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Local
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)
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type Op string
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const (
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Add Op = "+"
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Sub Op = "-"
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Neg Op = "!"
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Mul Op = "*"
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Div Op = "/"
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Mod Op = "%"
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LeftShift Op = "<<"
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RightShift Op = ">>"
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LessThan Op = "<"
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LessEqual Op = "<="
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GreaterThan Op = ">"
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GreaterEqual Op = ">="
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Equal Op = "=="
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NotEqual Op = "!="
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And Op = "&"
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Xor Op = "^"
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Or Op = "|"
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AndAnd Op = "&&"
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OrOr Op = "||"
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)
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