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shader: Parse structs

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This commit is contained in:
Hajime Hoshi 2020-05-11 00:13:08 +09:00
parent 90fdececa0
commit 6d182c4b55
4 changed files with 152 additions and 72 deletions
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14
internal/shader/block.go
View File

@ -22,6 +22,7 @@ import (
)
type block struct {
types []typ
vars []variable
consts []constant
funcs []function
@ -35,20 +36,25 @@ func (b *block) dump(indent int) []string {
var lines []string
for _, t := range b.types {
ls := t.dump(indent)
ls[0] = fmt.Sprintf("type %s %s", t.name, ls[0])
lines = append(lines, ls...)
}
for _, v := range b.vars {
init := ""
if v.init != nil {
init = " = " + dumpExpr(v.init)
}
lines = append(lines, fmt.Sprintf("%svar %s %s%s", idt, v.name, v.basicType, init))
lines = append(lines, fmt.Sprintf("%svar %s %s%s", idt, v.name, v.typ, init))
}
for _, c := range b.consts {
lines = append(lines, fmt.Sprintf("%sconst %s %s = %s", idt, c.name, c.basicType, dumpExpr(c.init)))
lines = append(lines, fmt.Sprintf("%sconst %s %s = %s", idt, c.name, c.typ, dumpExpr(c.init)))
}
for _, f := range b.funcs {
var args []string
for _, a := range f.args {
args = append(args, fmt.Sprintf("%s %s", a.name, a.basicType))
args = append(args, fmt.Sprintf("%s %s", a.name, a.typ))
}
var rets []string
for _, r := range f.rets {
@ -56,7 +62,7 @@ func (b *block) dump(indent int) []string {
if name == "" {
name = "_"
}
rets = append(rets, fmt.Sprintf("%s %s", name, r.basicType))
rets = append(rets, fmt.Sprintf("%s %s", name, r.typ))
}
l := fmt.Sprintf("func %s(%s)", f.name, strings.Join(args, ", "))
if len(rets) > 0 {

95
internal/shader/shader.go
View File

@ -34,15 +34,15 @@ var (
)
type variable struct {
name string
basicType basicType
init ast.Expr
name string
typ typ
init ast.Expr
}
type constant struct {
name string
basicType basicType
init ast.Expr
name string
typ typ
init ast.Expr
}
type function struct {
@ -133,7 +133,9 @@ func (sh *Shader) parseDecl(b *block, d ast.Decl, global bool) {
// TODO: Parse other types
for _, s := range d.Specs {
s := s.(*ast.TypeSpec)
sh.parseStruct(s)
t := sh.parseType(s.Type)
t.name = s.Name.Name
b.types = append(b.types, t)
}
case token.CONST:
for _, s := range d.Specs {
@ -193,32 +195,28 @@ func (sh *Shader) parseStruct(t *ast.TypeSpec) {
continue
}
t := sh.parseType(f.Type)
if t != basicTypeVec4 {
if t.basic != basicTypeVec4 {
sh.addError(f.Type.Pos(), fmt.Sprintf("position must be vec4 but %s", t))
continue
}
sh.position = variable{
name: f.Names[0].Name,
basicType: t,
name: f.Names[0].Name,
typ: t,
}
continue
}
t := sh.parseType(f.Type)
if !t.numeric() {
sh.addError(f.Type.Pos(), fmt.Sprintf("members in %s must be numeric but %s", varyingStructName, t))
continue
}
for _, n := range f.Names {
sh.varyings = append(sh.varyings, variable{
name: n.Name,
basicType: t,
name: n.Name,
typ: t,
})
}
}
}
func (s *Shader) parseVariable(block *block, vs *ast.ValueSpec) []variable {
var t basicType
var t typ
if vs.Type != nil {
t = s.parseType(vs.Type)
}
@ -228,22 +226,22 @@ func (s *Shader) parseVariable(block *block, vs *ast.ValueSpec) []variable {
var init ast.Expr
if len(vs.Values) > 0 {
init = vs.Values[i]
if t == basicTypeNone {
if t.isNone() {
t = s.detectType(block, init)
}
}
name := n.Name
vars = append(vars, variable{
name: name,
basicType: t,
init: init,
name: name,
typ: t,
init: init,
})
}
return vars
}
func (s *Shader) parseConstant(vs *ast.ValueSpec) []constant {
var t basicType
var t typ
if vs.Type != nil {
t = s.parseType(vs.Type)
}
@ -251,9 +249,9 @@ func (s *Shader) parseConstant(vs *ast.ValueSpec) []constant {
var cs []constant
for i, n := range vs.Names {
cs = append(cs, constant{
name: n.Name,
basicType: t,
init: vs.Values[i],
name: n.Name,
typ: t,
init: vs.Values[i],
})
}
return cs
@ -274,8 +272,8 @@ func (sh *Shader) parseFunc(d *ast.FuncDecl, block *block) function {
t := sh.parseType(f.Type)
for _, n := range f.Names {
args = append(args, variable{
name: n.Name,
basicType: t,
name: n.Name,
typ: t,
})
}
}
@ -286,14 +284,14 @@ func (sh *Shader) parseFunc(d *ast.FuncDecl, block *block) function {
t := sh.parseType(f.Type)
if len(f.Names) == 0 {
rets = append(rets, variable{
name: "",
basicType: t,
name: "",
typ: t,
})
} else {
for _, n := range f.Names {
rets = append(rets, variable{
name: n.Name,
basicType: t,
name: n.Name,
typ: t,
})
}
}
@ -323,7 +321,7 @@ func (sh *Shader) parseBlock(outer *block, b *ast.BlockStmt) *block {
name: s.(*ast.Ident).Name,
}
if len(l.Rhs) > 0 {
v.basicType = sh.detectType(block, l.Rhs[i])
v.typ = sh.detectType(block, l.Rhs[i])
}
block.vars = append(block.vars, v)
}
@ -371,31 +369,33 @@ func (sh *Shader) parseBlock(outer *block, b *ast.BlockStmt) *block {
return block
}
func (s *Shader) detectType(b *block, expr ast.Expr) basicType {
func (s *Shader) detectType(b *block, expr ast.Expr) typ {
switch e := expr.(type) {
case *ast.BasicLit:
if e.Kind == token.FLOAT {
return basicTypeFloat
return typ{
basic: basicTypeFloat,
}
}
if e.Kind == token.INT {
s.addError(expr.Pos(), fmt.Sprintf("integer literal is not implemented yet: %s", e.Value))
} else {
s.addError(expr.Pos(), fmt.Sprintf("unexpected literal: %s", e.Value))
}
return basicTypeNone
return typ{}
case *ast.CompositeLit:
return s.parseType(e.Type)
case *ast.Ident:
n := e.Name
for _, v := range b.vars {
if v.name == n {
return v.basicType
return v.typ
}
}
if b == &s.global {
for _, v := range s.uniforms {
if v.name == n {
return v.basicType
return v.typ
}
}
}
@ -403,12 +403,12 @@ func (s *Shader) detectType(b *block, expr ast.Expr) basicType {
return s.detectType(b.outer, e)
}
s.addError(expr.Pos(), fmt.Sprintf("unexpected identity: %s", n))
return basicTypeNone
return typ{}
//case *ast.SelectorExpr:
//return fmt.Sprintf("%s.%s", dumpExpr(e.X), dumpExpr(e.Sel))
default:
s.addError(expr.Pos(), fmt.Sprintf("detecting type not implemented: %#v", expr))
return basicTypeNone
return typ{}
}
}
@ -417,27 +417,16 @@ func (s *Shader) Dump() string {
var lines []string
if s.position.name != "" {
lines = append(lines, fmt.Sprintf("var %s varying %s // position", s.position.name, s.position.basicType))
lines = append(lines, fmt.Sprintf("var %s varying %s // position", s.position.name, s.position.typ))
}
for _, v := range s.varyings {
lines = append(lines, fmt.Sprintf("var %s varying %s", v.name, v.basicType))
lines = append(lines, fmt.Sprintf("var %s varying %s", v.name, v.typ))
}
for _, u := range s.uniforms {
lines = append(lines, fmt.Sprintf("var %s uniform %s", u.name, u.basicType))
lines = append(lines, fmt.Sprintf("var %s uniform %s", u.name, u.typ))
}
lines = append(lines, s.global.dump(0)...)
return strings.Join(lines, "\n") + "\n"
}
func (s *Shader) GlslVertex() string {
var lines []string
for _, v := range s.varyings {
// TODO: variable names must be escaped not to conflict with keywords.
lines = append(lines, fmt.Sprintf("varying %s %s;", v.basicType.glslString(), v.name))
}
return strings.Join(lines, "\n") + "\n"
}

10
internal/shader/shader_test.go
View File

@ -53,13 +53,15 @@ func F1(a, b vec2) vec4 {
return c2
}
`,
Dump: `var Position varying vec4 // position
var Color varying vec4
var TexCoord varying vec2
var Bar uniform vec2
Dump: `var Bar uniform vec2
var Baz uniform vec3
var Foo uniform float
var Quux uniform vec3
type VertexOut struct {
Position vec4
TexCoord vec2
Color vec4
}
const C1 float = 1
const C2 float = 2
const C3 float = 3

105
internal/shader/type.go
View File

@ -17,6 +17,7 @@ package shader
import (
"fmt"
"go/ast"
"strings"
)
type basicType int
@ -33,33 +34,113 @@ const (
basicTypeMat3
basicTypeMat4
basicTypeSampler2d
basicTypeStruct
)
func (s *Shader) parseType(expr ast.Expr) basicType {
type structMember struct {
name string
typ typ
tag string
}
type typ struct {
basic basicType
name string
structMembers []structMember
}
func (t *typ) isNone() bool {
return t.basic == basicTypeNone
}
func (sh *Shader) parseType(expr ast.Expr) typ {
switch t := expr.(type) {
case *ast.Ident:
switch t.Name {
case "float":
return basicTypeFloat
return typ{
basic: basicTypeFloat,
}
case "vec2":
return basicTypeVec2
return typ{
basic: basicTypeVec2,
}
case "vec3":
return basicTypeVec3
return typ{
basic: basicTypeVec3,
}
case "vec4":
return basicTypeVec4
return typ{
basic: basicTypeVec4,
}
case "mat2":
return basicTypeMat2
return typ{
basic: basicTypeMat2,
}
case "mat3":
return basicTypeMat3
return typ{
basic: basicTypeMat3,
}
case "mat4":
return basicTypeMat4
return typ{
basic: basicTypeMat4,
}
case "sampler2d":
return basicTypeSampler2d
return typ{
basic: basicTypeSampler2d,
}
default:
s.addError(t.Pos(), fmt.Sprintf("unexpected type: %s", t.Name))
sh.addError(t.Pos(), fmt.Sprintf("unexpected type: %s", t.Name))
return typ{}
}
case *ast.StructType:
str := typ{
basic: basicTypeStruct,
}
for _, f := range t.Fields.List {
typ := sh.parseType(f.Type)
var tag string
if f.Tag != nil {
tag = f.Tag.Value
}
for _, n := range f.Names {
str.structMembers = append(str.structMembers, structMember{
name: n.Name,
typ: typ,
tag: tag,
})
}
}
return str
default:
sh.addError(t.Pos(), fmt.Sprintf("unepxected type: %v", t))
return typ{}
}
return basicTypeNone
}
func (t typ) dump(indent int) []string {
idt := strings.Repeat("\t", indent)
switch t.basic {
case basicTypeStruct:
ls := []string{
fmt.Sprintf("%sstruct {", idt),
}
for _, m := range t.structMembers {
ls = append(ls, fmt.Sprintf("%s\t%s %s", idt, m.name, m.typ))
}
ls = append(ls, fmt.Sprintf("%s}", idt))
return ls
default:
return []string{t.basic.String()}
}
}
func (t typ) String() string {
if t.name != "" {
return t.name
}
return t.basic.String()
}
func (t basicType) String() string {
@ -82,6 +163,8 @@ func (t basicType) String() string {
return "mat4"
case basicTypeSampler2d:
return "sampler2d"
case basicTypeStruct:
return "(struct)"
default:
return fmt.Sprintf("unknown(%d)", t)
}