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internal/shader: refactoring

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This commit is contained in:
Hajime Hoshi 2022-07-10 16:02:50 +09:00
parent bf0f3d304b
commit 8c879c7bcf
1 changed files with 44 additions and 40 deletions
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84
internal/shader/stmt.go
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@ -442,62 +442,66 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
}
}
for i, r := range stmt.Results {
exprs, ts, ss, ok := cs.parseExpr(block, r, true)
var exprs []shaderir.Expr
var types []shaderir.Type
for _, r := range stmt.Results {
es, ts, ss, ok := cs.parseExpr(block, r, true)
if !ok {
return nil, false
}
stmts = append(stmts, ss...)
if len(exprs) > 1 {
if len(stmt.Results) > 1 || len(outParams) == 1 {
cs.addError(r.Pos(), "single-value context and multiple-value context cannot be mixed")
return nil, false
}
if len(es) > 1 && (len(stmt.Results) > 1 || len(outParams) == 1) {
cs.addError(r.Pos(), "single-value context and multiple-value context cannot be mixed")
return nil, false
}
if len(outParams) > 1 && len(stmt.Results) == 1 {
if len(exprs) == 1 {
if len(es) == 1 {
cs.addError(stmt.Pos(), fmt.Sprintf("the number of returning variables must be %d but %d", len(outParams), len(stmt.Results)))
return nil, false
}
if len(exprs) > 1 && len(exprs) != len(outParams) {
cs.addError(stmt.Pos(), fmt.Sprintf("the number of returning variables must be %d but %d", len(outParams), len(exprs)))
if len(es) > 1 && len(es) != len(outParams) {
cs.addError(stmt.Pos(), fmt.Sprintf("the number of returning variables must be %d but %d", len(outParams), len(es)))
return nil, false
}
}
for j, t := range ts {
expr := exprs[j]
if expr.Type == shaderir.NumberExpr {
switch outParams[i+j].typ.Main {
case shaderir.Int:
if !cs.forceToInt(stmt, &expr) {
return nil, false
}
t = shaderir.Type{Main: shaderir.Int}
case shaderir.Float:
t = shaderir.Type{Main: shaderir.Float}
}
}
if !t.Equal(&outParams[i+j].typ) {
cs.addError(stmt.Pos(), fmt.Sprintf("cannot use type %s as type %s in return argument", t.String(), &outParams[i].typ))
return nil, false
}
stmts = append(stmts, shaderir.Stmt{
Type: shaderir.Assign,
Exprs: []shaderir.Expr{
{
Type: shaderir.LocalVariable,
Index: len(inParams) + i + j,
},
expr,
},
})
}
exprs = append(exprs, es...)
types = append(types, ts...)
}
for i, t := range types {
expr := exprs[i]
if expr.Type == shaderir.NumberExpr {
switch outParams[i].typ.Main {
case shaderir.Int:
if !cs.forceToInt(stmt, &expr) {
return nil, false
}
t = shaderir.Type{Main: shaderir.Int}
case shaderir.Float:
t = shaderir.Type{Main: shaderir.Float}
}
}
if !t.Equal(&outParams[i].typ) {
cs.addError(stmt.Pos(), fmt.Sprintf("cannot use type %s as type %s in return argument", t.String(), &outParams[i].typ))
return nil, false
}
stmts = append(stmts, shaderir.Stmt{
Type: shaderir.Assign,
Exprs: []shaderir.Expr{
{
Type: shaderir.LocalVariable,
Index: len(inParams) + i,
},
expr,
},
})
}
stmts = append(stmts, shaderir.Stmt{
Type: shaderir.Return,
})