Merge 359e7b8597 into 4b1c0526a7

internal/shader/delayed.go

@@ -0,0 +1,165 @@
+// Copyright 2024 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package shader
+
+import (
+	"fmt"
+	gconstant "go/constant"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
+)
+
+type delayedTypeValidator interface {
+	Validate(t shaderir.Type) (shaderir.Type, bool)
+	IsValidated() (shaderir.Type, bool)
+	Error() string
+}
+
+func isArgDefaultTypeInt(f shaderir.BuiltinFunc) bool {
+	return f == shaderir.IntF || f == shaderir.IVec2F || f == shaderir.IVec3F || f == shaderir.IVec4F
+}
+
+func isIntType(t shaderir.Type) bool {
+	return t.Main == shaderir.Int || t.IsIntVector()
+}
+
+func (cs *compileState) ValidateDefaultTypesForExpr(block *block, expr shaderir.Expr, t shaderir.Type) shaderir.Type {
+	if check, ok := cs.delayedTypeCheks[expr.Ast]; ok {
+		if resT, ok := check.IsValidated(); ok {
+			return resT
+		}
+		resT, ok := check.Validate(t)
+		if !ok {
+			return shaderir.Type{Main: shaderir.None}
+		}
+		return resT
+	}
+
+	switch expr.Type {
+	case shaderir.LocalVariable:
+		return block.vars[expr.Index].typ
+
+	case shaderir.Binary:
+		left := expr.Exprs[0]
+		right := expr.Exprs[1]
+
+		leftType := cs.ValidateDefaultTypesForExpr(block, left, t)
+		rightType := cs.ValidateDefaultTypesForExpr(block, right, t)
+
+		// Usure about top-level type, try to validate by neighbour type
+		// The same work is done twice. Can it be optimized?
+		if t.Main == shaderir.None {
+			cs.ValidateDefaultTypesForExpr(block, left, rightType)
+			cs.ValidateDefaultTypesForExpr(block, right, leftType)
+		}
+	case shaderir.Call:
+		fun := expr.Exprs[0]
+		if fun.Type == shaderir.BuiltinFuncExpr {
+			if isArgDefaultTypeInt(fun.BuiltinFunc) {
+				for _, e := range expr.Exprs[1:] {
+					cs.ValidateDefaultTypesForExpr(block, e, shaderir.Type{Main: shaderir.Int})
+				}
+				return shaderir.Type{Main: shaderir.Int}
+			}
+
+			for _, e := range expr.Exprs[1:] {
+				cs.ValidateDefaultTypesForExpr(block, e, shaderir.Type{Main: shaderir.Float})
+			}
+			return shaderir.Type{Main: shaderir.Float}
+		}
+
+		if fun.Type == shaderir.FunctionExpr {
+			args := cs.funcs[fun.Index].ir.InParams
+
+			for i, e := range expr.Exprs[1:] {
+				cs.ValidateDefaultTypesForExpr(block, e, args[i])
+			}
+
+			retT := cs.funcs[fun.Index].ir.Return
+
+			return retT
+		}
+	}
+
+	return shaderir.Type{Main: shaderir.None}
+}
+
+func (cs *compileState) ValidateDefaultTypes(block *block, stmt shaderir.Stmt) {
+	switch stmt.Type {
+	case shaderir.Assign:
+		left := stmt.Exprs[0]
+		right := stmt.Exprs[1]
+		if left.Type == shaderir.LocalVariable {
+			varType := block.vars[left.Index].typ
+			// Type is not explicitly specified
+			if stmt.IsTypeGuessed {
+				varType = shaderir.Type{Main: shaderir.None}
+			}
+			cs.ValidateDefaultTypesForExpr(block, right, varType)
+		}
+	case shaderir.ExprStmt:
+		for _, e := range stmt.Exprs {
+			cs.ValidateDefaultTypesForExpr(block, e, shaderir.Type{Main: shaderir.None})
+		}
+	}
+}
+
+type delayedShiftValidator struct {
+	shiftType      shaderir.Op
+	value          gconstant.Value
+	validated      bool
+	closestUnknown bool
+	failed         bool
+}
+
+func (d *delayedShiftValidator) IsValidated() (shaderir.Type, bool) {
+	if d.failed {
+		return shaderir.Type{}, false
+	}
+	if d.validated {
+		return shaderir.Type{Main: shaderir.Int}, true
+	}
+	// If only matched with None
+	if d.closestUnknown {
+		// Was it originally represented by an int constant?
+		if d.value.Kind() == gconstant.Int {
+			return shaderir.Type{Main: shaderir.Int}, true
+		}
+	}
+	return shaderir.Type{}, false
+}
+
+func (d *delayedShiftValidator) Validate(t shaderir.Type) (shaderir.Type, bool) {
+	if d.validated {
+		return shaderir.Type{Main: shaderir.Int}, true
+	}
+	if isIntType(t) {
+		d.validated = true
+		return shaderir.Type{Main: shaderir.Int}, true
+	}
+	if t.Main == shaderir.None {
+		d.closestUnknown = true
+		return t, true
+	}
+	return shaderir.Type{Main: shaderir.None}, false
+}
+
+func (d *delayedShiftValidator) Error() string {
+	st := "left shift"
+	if d.shiftType == shaderir.RightShift {
+		st = "right shift"
+	}
+	return fmt.Sprintf("left operand for %s should be int", st)
+}

internal/shader/expr.go

@@ -36,7 +36,7 @@ func canTruncateToFloat(v gconstant.Value) bool {
 
 var textureVariableRe = regexp.MustCompile(`\A__t(\d+)\z`)
 
-func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, markLocalVariableUsed bool) ([]shaderir.Expr, []shaderir.Type, []shaderir.Stmt, bool) {
+func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, markLocalVariableUsed bool) (rexpr []shaderir.Expr, rtype []shaderir.Type, rstmt []shaderir.Stmt, ok bool) {
 	switch e := expr.(type) {
 	case *ast.BasicLit:
 		switch e.Kind {
@@ -105,7 +105,14 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 		}
 
 		// Resolve untyped constants.
-		l, r, ok := shaderir.ResolveUntypedConstsForBinaryOp(lhs[0].Const, rhs[0].Const, lhst, rhst)
+		var l gconstant.Value
+		var r gconstant.Value
+		origLvalue := lhs[0].Const
+		if op2 == shaderir.LeftShift || op2 == shaderir.RightShift {
+			l, r, ok = shaderir.ResolveUntypedConstsForBitShiftOp(lhs[0].Const, rhs[0].Const, lhst, rhst)
+		} else {
+			l, r, ok = shaderir.ResolveUntypedConstsForBinaryOp(lhs[0].Const, rhs[0].Const, lhst, rhst)
+		}
 		if !ok {
 			// TODO: Show a better type name for untyped constants.
 			cs.addError(e.Pos(), fmt.Sprintf("types don't match: %s %s %s", lhst.String(), op, rhst.String()))
@@ -113,27 +120,49 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 		}
 		lhs[0].Const, rhs[0].Const = l, r
 
-		// If either is typed, resolve the other type.
+		if op2 == shaderir.LeftShift || op2 == shaderir.RightShift {
-		// If both are untyped, keep them untyped.
+			if !(lhst.Main == shaderir.None && rhst.Main == shaderir.None) {
-		if lhst.Main != shaderir.None || rhst.Main != shaderir.None {
+				// If both are const
-			if lhs[0].Const != nil {
+				if rhs[0].Const != nil && (rhst.Main == shaderir.None || lhs[0].Const != nil) {
-				switch lhs[0].Const.Kind() {
+					rhst = shaderir.Type{Main: shaderir.Int}
-				case gconstant.Float:
+				}
-					lhst = shaderir.Type{Main: shaderir.Float}
+
-				case gconstant.Int:
+				// If left is untyped const
+				if lhst.Main == shaderir.None && lhs[0].Const != nil {
 					lhst = shaderir.Type{Main: shaderir.Int}
-				case gconstant.Bool:
+					// Left should be implicitly converted to the type it would assume if the shift expression were replaced by its left operand alone.
-					lhst = shaderir.Type{Main: shaderir.Bool}
+					if rhs[0].Const == nil {
+						defer func() {
+							if ok {
+								cs.addDelayedTypeCheck(expr, &delayedShiftValidator{value: origLvalue})
+							}
+						}()
+					}
 				}
 			}
-			if rhs[0].Const != nil {
+		} else {
-				switch rhs[0].Const.Kind() {
+			// If either is typed, resolve the other type.
-				case gconstant.Float:
+			// If both are untyped, keep them untyped.
-					rhst = shaderir.Type{Main: shaderir.Float}
+			if lhst.Main != shaderir.None || rhst.Main != shaderir.None {
-				case gconstant.Int:
+				if lhs[0].Const != nil {
-					rhst = shaderir.Type{Main: shaderir.Int}
+					switch lhs[0].Const.Kind() {
-				case gconstant.Bool:
+					case gconstant.Float:
-					rhst = shaderir.Type{Main: shaderir.Bool}
+						lhst = shaderir.Type{Main: shaderir.Float}
+					case gconstant.Int:
+						lhst = shaderir.Type{Main: shaderir.Int}
+					case gconstant.Bool:
+						lhst = shaderir.Type{Main: shaderir.Bool}
+					}
+				}
+				if rhs[0].Const != nil {
+					switch rhs[0].Const.Kind() {
+					case gconstant.Float:
+						rhst = shaderir.Type{Main: shaderir.Float}
+					case gconstant.Int:
+						rhst = shaderir.Type{Main: shaderir.Int}
+					case gconstant.Bool:
+						rhst = shaderir.Type{Main: shaderir.Bool}
+					}
 				}
 			}
 		}
@@ -153,6 +182,13 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 				v = gconstant.MakeBool(b)
 			case token.EQL, token.NEQ, token.LSS, token.LEQ, token.GTR, token.GEQ:
 				v = gconstant.MakeBool(gconstant.Compare(lhs[0].Const, op, rhs[0].Const))
+			case token.SHL, token.SHR:
+				shift, ok := gconstant.Int64Val(rhs[0].Const)
+				if !ok {
+					cs.addError(e.Pos(), fmt.Sprintf("unexpected %s type for: %s", rhs[0].Const.String(), e.Op))
+				} else {
+					v = gconstant.Shift(lhs[0].Const, op, uint(shift))
+				}
 			default:
 				v = gconstant.BinaryOp(lhs[0].Const, op, rhs[0].Const)
 			}
@@ -169,6 +205,7 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 			{
 				Type:  shaderir.Binary,
 				Op:    op2,
+				Ast:   expr,
 				Exprs: []shaderir.Expr{lhs[0], rhs[0]},
 			},
 		}, []shaderir.Type{t}, stmts, true

internal/shader/shader.go

@@ -61,6 +61,8 @@ type compileState struct {
 
 	varyingParsed bool
 
+	delayedTypeCheks map[ast.Expr]delayedTypeValidator
+
 	errs []string
 }
 
@@ -82,6 +84,13 @@ func (cs *compileState) findUniformVariable(name string) (int, bool) {
 	return 0, false
 }
 
+func (cs *compileState) addDelayedTypeCheck(at ast.Expr, check delayedTypeValidator) {
+	if cs.delayedTypeCheks == nil {
+		cs.delayedTypeCheks = make(map[ast.Expr]delayedTypeValidator, 1)
+	}
+	cs.delayedTypeCheks[at] = check
+}
+
 type typ struct {
 	name string
 	ir   shaderir.Type

internal/shader/stmt.go

@@ -49,6 +49,10 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 			if !ok {
 				return nil, false
 			}
+			for i := range ss {
+				ss[i].IsTypeGuessed = true
+			}
+
 			stmts = append(stmts, ss...)
 		case token.ASSIGN:
 			if len(stmt.Lhs) != len(stmt.Rhs) && len(stmt.Rhs) != 1 {
@@ -60,7 +64,7 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 				return nil, false
 			}
 			stmts = append(stmts, ss...)
-		case token.ADD_ASSIGN, token.SUB_ASSIGN, token.MUL_ASSIGN, token.QUO_ASSIGN, token.REM_ASSIGN, token.AND_ASSIGN, token.OR_ASSIGN, token.XOR_ASSIGN, token.AND_NOT_ASSIGN:
+		case token.ADD_ASSIGN, token.SUB_ASSIGN, token.MUL_ASSIGN, token.QUO_ASSIGN, token.REM_ASSIGN, token.AND_ASSIGN, token.OR_ASSIGN, token.XOR_ASSIGN, token.AND_NOT_ASSIGN, token.SHL_ASSIGN, token.SHR_ASSIGN:
 			rhs, rts, ss, ok := cs.parseExpr(block, fname, stmt.Rhs[0], true)
 			if !ok {
 				return nil, false
@@ -100,6 +104,10 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 				op = shaderir.Or
 			case token.XOR_ASSIGN:
 				op = shaderir.Xor
+			case token.SHL_ASSIGN:
+				op = shaderir.LeftShift
+			case token.SHR_ASSIGN:
+				op = shaderir.RightShift
 			default:
 				cs.addError(stmt.Pos(), fmt.Sprintf("unexpected token: %s", stmt.Tok))
 				return nil, false
@@ -110,7 +118,7 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 					cs.addError(stmt.Pos(), fmt.Sprintf("invalid operation: operator / not defined on %s", rts[0].String()))
 					return nil, false
 				}
-				if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor {
+				if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor || op == shaderir.LeftShift || op == shaderir.RightShift {
 					if lts[0].Main != shaderir.Int && !lts[0].IsIntVector() {
 						cs.addError(stmt.Pos(), fmt.Sprintf("invalid operation: operator %s not defined on %s", stmt.Tok, lts[0].String()))
 					}
@@ -137,7 +145,7 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 						}
 					}
 				case shaderir.Float:
-					if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor {
+					if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor || op == shaderir.LeftShift || op == shaderir.RightShift {
 						cs.addError(stmt.Pos(), fmt.Sprintf("invalid operation: operator %s not defined on %s", stmt.Tok, lts[0].String()))
 					} else if rhs[0].Const != nil &&
 						(rts[0].Main == shaderir.None || rts[0].Main == shaderir.Float) &&
@@ -148,7 +156,7 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 						return nil, false
 					}
 				case shaderir.Vec2, shaderir.Vec3, shaderir.Vec4, shaderir.Mat2, shaderir.Mat3, shaderir.Mat4:
-					if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor {
+					if op == shaderir.And || op == shaderir.Or || op == shaderir.Xor || op == shaderir.LeftShift || op == shaderir.RightShift {
 						cs.addError(stmt.Pos(), fmt.Sprintf("invalid operation: operator %s not defined on %s", stmt.Tok, lts[0].String()))
 					} else if (op == shaderir.MatrixMul || op == shaderir.Div) &&
 						(rts[0].Main == shaderir.Float ||
@@ -469,6 +477,25 @@ func (cs *compileState) parseStmt(block *block, fname string, stmt ast.Stmt, inP
 		cs.addError(stmt.Pos(), fmt.Sprintf("unexpected statement: %#v", stmt))
 		return nil, false
 	}
+
+	// Need to run delayed checks
+	if len(cs.delayedTypeCheks) != 0 {
+		for _, st := range stmts {
+			cs.ValidateDefaultTypes(block, st)
+		}
+
+		// Collect all errors first
+		foundErr := false
+		for s, v := range cs.delayedTypeCheks {
+			if _, ok := v.IsValidated(); !ok {
+				foundErr = true
+				cs.addError(s.Pos(), v.Error())
+			}
+		}
+		if foundErr {
+			return nil, false
+		}
+	}
 	return stmts, true
 }
 

internal/shader/syntax_test.go

@@ -1314,6 +1314,263 @@ func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
 	}
 }
 
+// Issue: #2755
+func TestSyntaxOperatorShift(t *testing.T) {
+	cases := []struct {
+		stmt string
+		err  bool
+	}{
+		{stmt: "b := 2.0; a := 1.0 << 2.0 == b; _ = a", err: false},
+		{stmt: "s := 1; b := 2.0; a := 1.0<<s == b; _ = a", err: true},
+		{stmt: "s := 1; b := 2; a := 1.0<<s == b; _ = a", err: false},
+		{stmt: "s := 1; a := 2.0<<s + ivec2(3.0<<s); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0<<s + vec2(3); _ = a", err: true},
+		{stmt: "s := 1; a := 2.0<<s + ivec2(3); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0<<s + foo_int_int(3.0<<s); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0<<s + 3.0<<s; _ = a", err: true},
+		{stmt: "s := 1; a := 2<<s + 3.0<<s; _ = a", err: true},
+		{stmt: "s := 1; a := 2.0<<s + 3<<s; _ = a", err: true},
+		{stmt: "s := 1; a := 2<<s + 3<<s; _ = a", err: false},
+		{stmt: "s := 1; foo_multivar(0, 0, 2<<s)", err: false},
+		{stmt: "s := 1; foo_multivar(0, 2.0<<s, 0)", err: true},
+		{stmt: "s := 1; foo_multivar(2.0<<s, 0, 0)", err: false},
+		{stmt: "s := 1; a := foo_multivar(2.0<<s, 0, 0); _ = a", err: false},
+		{stmt: "s := 1; a := foo_multivar(0, 2.0<<s, 0); _ = a", err: true},
+		{stmt: "s := 1; a := foo_multivar(0, 0, 2.0<<s); _ = a", err: false},
+		{stmt: "a := foo_multivar(0, 0, 1.0<<2.0); _ = a", err: false},
+		{stmt: "a := foo_multivar(0, 1.0<<2.0, 0); _ = a", err: false},
+		{stmt: "s := 1; a := int(1) + 1.0<<s + int(float(1<<s)); _ = a", err: true},
+		{stmt: "s := 1; var a int = 1.0 << 2.0 << 3.0 << 4.0 << s; _ = a", err: false},
+		{stmt: "s := 1; var a float = 1 << 1 << 1 << 1 << s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 << s + 1.2; _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 << s + 1.2; _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 << s + foo_float_float(2); _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 << s + foo_float_int(2); _ = a", err: false},
+		{stmt: "s := 1; a := foo_float_int(1.0<<s) + foo_float_int(2); _ = a", err: true},
+		{stmt: "s := 1; a := foo_int_float(1<<s) + foo_int_float(2); _ = a", err: false},
+		{stmt: "s := 1; a := foo_int_int(1<<s) + foo_int_int(2); _ = a", err: false},
+		{stmt: "s := 1; t := 2.0; a := t + 1.0 << s; _ = a", err: true},
+		{stmt: "s := 1; t := 2; a := t + 1.0 << s; _ = a", err: false},
+		{stmt: "s := 1; b := 1 << s; _ = b", err: false},
+		{stmt: "var a = 1; b := a << 2.0; _ = b", err: false},
+		{stmt: "s := 1; var a float; a = 1 << s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 << s; _ = a", err: true},
+		{stmt: "s := 1; var a float = float(1.0 << s); _ = a", err: true},
+		{stmt: "s := 1; var a int = int(1 << s); _ = a", err: false},
+		{stmt: "s := 1; var a int = int(1.0 << s); _ = a", err: false},
+		{stmt: "s := 1; a := 1 << s; _ = a", err: false},
+		{stmt: "s := 1; a := 1.0 << s; _ = a", err: true},
+		{stmt: "s := 1; a := int(1.0 << s); _ = a", err: false},
+		{stmt: "s := 1; var a float = float(1.0 << s); _ = a", err: true},
+		{stmt: "s := 1; var a float = 1.0 << s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 << s; _ = a", err: true},
+		{stmt: "s := 1; var a int = 1.0 << s; _ = a", err: false},
+		{stmt: "s := 1; var a int = 1 << s; _ = a", err: false},
+		{stmt: "var a float = 1.0 << 2.0; _ = a", err: false},
+		{stmt: "var a int = 1.0 << 2; _ = a", err: false},
+		{stmt: "var a float = 1.0 << 2; _ = a", err: false},
+		{stmt: "a := 1 << 2.0; _ = a", err: false},
+		{stmt: "a := 1.0 << 2; _ = a", err: false},
+		{stmt: "a := 1.0 << 2.0; _ = a", err: false},
+		{stmt: "a := 1 << 2; _ = a", err: false},
+		{stmt: "a := float(1.0) << 2; _ = a", err: true},
+		{stmt: "a := 1 << float(2.0); _ = a", err: false},
+		{stmt: "a := 1.0 << float(2.0); _ = a", err: false},
+		{stmt: "a := ivec2(1) << 2; _ = a", err: false},
+		{stmt: "a := 1 << ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) << float(2.0); _ = a", err: true},
+		{stmt: "a := float(1.0) << ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) << ivec2(2); _ = a", err: false},
+		{stmt: "a := ivec3(1) << ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) << ivec3(2); _ = a", err: true},
+		{stmt: "a := 1 << vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) << 2; _ = a", err: true},
+		{stmt: "a := float(1.0) << vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) << float(2.0); _ = a", err: true},
+		{stmt: "a := vec2(1) << vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) << vec3(2); _ = a", err: true},
+		{stmt: "a := vec3(1) << vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) << ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) << vec2(2); _ = a", err: true},
+		{stmt: "a := vec3(1) << ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) << vec3(2); _ = a", err: true},
+
+		{stmt: "b := 2.0; a := 1.0 >> 2.0 == b; _ = a", err: false},
+		{stmt: "s := 1; b := 2.0; a := 1.0>>s == b; _ = a", err: true},
+		{stmt: "s := 1; b := 2; a := 1.0>>s == b; _ = a", err: false},
+		{stmt: "s := 1; a := 2.0>>s + ivec2(3.0>>s); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0>>s + vec2(3); _ = a", err: true},
+		{stmt: "s := 1; a := 2.0>>s + ivec2(3); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0>>s + foo_int_int(3.0>>s); _ = a", err: false},
+		{stmt: "s := 1; a := 2.0>>s + 3.0>>s; _ = a", err: true},
+		{stmt: "s := 1; a := 2>>s + 3.0>>s; _ = a", err: true},
+		{stmt: "s := 1; a := 2.0>>s + 3>>s; _ = a", err: true},
+		{stmt: "s := 1; a := 2>>s + 3>>s; _ = a", err: false},
+		{stmt: "s := 1; foo_multivar(0, 0, 2>>s)", err: false},
+		{stmt: "s := 1; foo_multivar(0, 2.0>>s, 0)", err: true},
+		{stmt: "s := 1; foo_multivar(2.0>>s, 0, 0)", err: false},
+		{stmt: "s := 1; a := foo_multivar(2.0>>s, 0, 0); _ = a", err: false},
+		{stmt: "s := 1; a := foo_multivar(0, 2.0>>s, 0); _ = a", err: true},
+		{stmt: "s := 1; a := foo_multivar(0, 0, 2.0>>s); _ = a", err: false},
+		{stmt: "a := foo_multivar(0, 0, 1.0>>2.0); _ = a", err: false},
+		{stmt: "a := foo_multivar(0, 1.0>>2.0, 0); _ = a", err: false},
+		{stmt: "s := 1; a := int(1) + 1.0>>s + int(float(1>>s)); _ = a", err: true},
+		{stmt: "s := 1; var a int = 1.0 >> 2.0 >> 3.0 >> 4.0 >> s; _ = a", err: false},
+		{stmt: "s := 1; var a float = 1 >> 1 >> 1 >> 1 >> s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 >> s + 1.2; _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 >> s + 1.2; _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 >> s + foo_float_float(2); _ = a", err: true},
+		{stmt: "s := 1; a := 1.0 >> s + foo_float_int(2); _ = a", err: false},
+		{stmt: "s := 1; a := foo_float_int(1.0>>s) + foo_float_int(2); _ = a", err: true},
+		{stmt: "s := 1; a := foo_int_float(1>>s) + foo_int_float(2); _ = a", err: false},
+		{stmt: "s := 1; a := foo_int_int(1>>s) + foo_int_int(2); _ = a", err: false},
+		{stmt: "s := 1; t := 2.0; a := t + 1.0 >> s; _ = a", err: true},
+		{stmt: "s := 1; t := 2; a := t + 1.0 >> s; _ = a", err: false},
+		{stmt: "s := 1; b := 1 >> s; _ = b", err: false},
+		{stmt: "var a = 1; b := a >> 2.0; _ = b", err: false},
+		{stmt: "s := 1; var a float; a = 1 >> s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 >> s; _ = a", err: true},
+		{stmt: "s := 1; var a float = float(1.0 >> s); _ = a", err: true},
+		{stmt: "s := 1; var a int = int(1 >> s); _ = a", err: false},
+		{stmt: "s := 1; var a int = int(1.0 >> s); _ = a", err: false},
+		{stmt: "s := 1; a := 1 >> s; _ = a", err: false},
+		{stmt: "s := 1; a := 1.0 >> s; _ = a", err: true},
+		{stmt: "s := 1; a := int(1.0 >> s); _ = a", err: false},
+		{stmt: "s := 1; var a float = float(1.0 >> s); _ = a", err: true},
+		{stmt: "s := 1; var a float = 1.0 >> s; _ = a", err: true},
+		{stmt: "s := 1; var a float = 1 >> s; _ = a", err: true},
+		{stmt: "s := 1; var a int = 1.0 >> s; _ = a", err: false},
+		{stmt: "s := 1; var a int = 1 >> s; _ = a", err: false},
+		{stmt: "var a float = 1.0 >> 2.0; _ = a", err: false},
+		{stmt: "var a int = 1.0 >> 2; _ = a", err: false},
+		{stmt: "var a float = 1.0 >> 2; _ = a", err: false},
+		{stmt: "a := 1 >> 2.0; _ = a", err: false},
+		{stmt: "a := 1.0 >> 2; _ = a", err: false},
+		{stmt: "a := 1.0 >> 2.0; _ = a", err: false},
+		{stmt: "a := 1 >> 2; _ = a", err: false},
+		{stmt: "a := float(1.0) >> 2; _ = a", err: true},
+		{stmt: "a := 1 >> float(2.0); _ = a", err: false},
+		{stmt: "a := 1.0 >> float(2.0); _ = a", err: false},
+		{stmt: "a := ivec2(1) >> 2; _ = a", err: false},
+		{stmt: "a := 1 >> ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) >> float(2.0); _ = a", err: true},
+		{stmt: "a := float(1.0) >> ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) >> ivec2(2); _ = a", err: false},
+		{stmt: "a := ivec3(1) >> ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) >> ivec3(2); _ = a", err: true},
+		{stmt: "a := 1 >> vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) >> 2; _ = a", err: true},
+		{stmt: "a := float(1.0) >> vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) >> float(2.0); _ = a", err: true},
+		{stmt: "a := vec2(1) >> vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) >> vec3(2); _ = a", err: true},
+		{stmt: "a := vec3(1) >> vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1) >> ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) >> vec2(2); _ = a", err: true},
+		{stmt: "a := vec3(1) >> ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1) >> vec3(2); _ = a", err: true},
+	}
+
+	for _, c := range cases {
+		_, err := compileToIR([]byte(fmt.Sprintf(`package main
+func foo_multivar(x int, y float, z int) int {return x}
+func foo_int_int(x int) int {return x}
+func foo_float_int(x float) int {return int(x)}
+func foo_int_float(x int) float {return float(x)}
+func foo_float_float(x float) float {return x}
+func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
+	%s
+	return dstPos
+}`, c.stmt)))
+		if err == nil && c.err {
+			t.Errorf("%s must return an error but does not", c.stmt)
+		} else if err != nil && !c.err {
+			t.Errorf("%s must not return nil but returned %v", c.stmt, err)
+		}
+	}
+}
+
+func TestSyntaxOperatorShiftAssign(t *testing.T) {
+	cases := []struct {
+		stmt string
+		err  bool
+	}{
+		{stmt: "a := 1; a <<= 2; _ = a", err: false},
+		{stmt: "a := 1; a <<= 2.0; _ = a", err: false},
+		{stmt: "a := float(1.0); a <<= 2; _ = a", err: true},
+		{stmt: "a := 1; a <<= float(2.0); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= 2; _ = a", err: false},
+		{stmt: "a := 1;  a <<= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= float(2.0); _ = a", err: true},
+		{stmt: "a := float(1.0); a <<= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= ivec2(2); _ = a", err: false},
+		{stmt: "a := ivec3(1); a <<= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= ivec3(2); _ = a", err: true},
+		{stmt: "a := 1; a <<= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a <<= 2; _ = a", err: true},
+		{stmt: "a := float(1.0); a <<= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a <<= float(2.0); _ = a", err: true},
+		{stmt: "a := vec2(1); a <<= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a <<= vec3(2); _ = a", err: true},
+		{stmt: "a := vec3(1); a <<= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a <<= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= vec2(2); _ = a", err: true},
+		{stmt: "a := vec3(1); a <<= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a <<= vec3(2); _ = a", err: true},
+		{stmt: "const c = 2; a := 1; a <<= c; _ = a", err: false},
+		{stmt: "const c = 2.0; a := 1; a <<= c; _ = a", err: false},
+		{stmt: "const c = 2; a := float(1.0); a <<= c; _ = a", err: true},
+		{stmt: "const c float = 2; a := 1; a <<= c; _ = a", err: true},
+		{stmt: "const c float = 2.0; a := 1; a <<= c; _ = a", err: true},
+		{stmt: "const c int = 2; a := ivec2(1); a <<= c; _ = a", err: false},
+		{stmt: "const c int = 2; a := vec2(1); a <<= c; _ = a", err: true},
+
+		{stmt: "a := 1; a >>= 2; _ = a", err: false},
+		{stmt: "a := 1; a >>= 2.0; _ = a", err: false},
+		{stmt: "a := float(1.0); a >>= 2; _ = a", err: true},
+		{stmt: "a := 1; a >>= float(2.0); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= 2; _ = a", err: false},
+		{stmt: "a := 1;  a >>= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= float(2.0); _ = a", err: true},
+		{stmt: "a := float(1.0); a >>= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= ivec2(2); _ = a", err: false},
+		{stmt: "a := ivec3(1); a >>= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= ivec3(2); _ = a", err: true},
+		{stmt: "a := 1; a >>= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a >>= 2; _ = a", err: true},
+		{stmt: "a := float(1.0); a >>= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a >>= float(2.0); _ = a", err: true},
+		{stmt: "a := vec2(1); a >>= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a >>= vec3(2); _ = a", err: true},
+		{stmt: "a := vec3(1); a >>= vec2(2); _ = a", err: true},
+		{stmt: "a := vec2(1); a >>= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= vec2(2); _ = a", err: true},
+		{stmt: "a := vec3(1); a >>= ivec2(2); _ = a", err: true},
+		{stmt: "a := ivec2(1); a >>= vec3(2); _ = a", err: true},
+		{stmt: "const c = 2; a := 1; a >>= c; _ = a", err: false},
+		{stmt: "const c = 2.0; a := 1; a >>= c; _ = a", err: false},
+		{stmt: "const c = 2; a := float(1.0); a >>= c; _ = a", err: true},
+		{stmt: "const c float = 2; a := 1; a >>= c; _ = a", err: true},
+		{stmt: "const c float = 2.0; a := 1; a >>= c; _ = a", err: true},
+		{stmt: "const c int = 2; a := ivec2(1); a >>= c; _ = a", err: false},
+		{stmt: "const c int = 2; a := vec2(1); a >>= c; _ = a", err: true},
+	}
+
+	for _, c := range cases {
+		_, err := compileToIR([]byte(fmt.Sprintf(`package main
+
+func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
+	%s
+	return dstPos
+}`, c.stmt)))
+		if err == nil && c.err {
+			t.Errorf("%s must return an error but does not", c.stmt)
+		} else if err != nil && !c.err {
+			t.Errorf("%s must not return nil but returned %v", c.stmt, err)
+		}
+	}
+}
+
 // Issue #1971
 func TestSyntaxOperatorMultiplyAssign(t *testing.T) {
 	cases := []struct {

internal/shaderir/check.go

@@ -18,6 +18,29 @@ import (
 	"go/constant"
 )
 
+func ResolveUntypedConstsForBitShiftOp(lhs, rhs constant.Value, lhst, rhst Type) (newLhs, newRhs constant.Value, ok bool) {
+	cLhs := lhs
+	cRhs := rhs
+
+	// Right is const -> int
+	if rhs != nil {
+		cRhs = constant.ToInt(rhs)
+		if cRhs.Kind() == constant.Unknown {
+			return nil, nil, false
+		}
+	}
+
+	// Left if untyped const -> int
+	if lhs != nil && lhst.Main == None {
+		cLhs = constant.ToInt(lhs)
+		if cLhs.Kind() == constant.Unknown {
+			return nil, nil, false
+		}
+	}
+
+	return cLhs, cRhs, true
+}
+
 func ResolveUntypedConstsForBinaryOp(lhs, rhs constant.Value, lhst, rhst Type) (newLhs, newRhs constant.Value, ok bool) {
 	if lhst.Main == None && rhst.Main == None {
 		if lhs.Kind() == rhs.Kind() {
@@ -121,6 +144,16 @@ func TypeFromBinaryOp(op Op, lhst, rhst Type, lhsConst, rhsConst constant.Value)
 		panic("shaderir: cannot resolve untyped values")
 	}
 
+	if op == LeftShift || op == RightShift {
+		if (lhst.Main == Int || lhst.IsIntVector()) && rhst.Main == Int {
+			return lhst, true
+		}
+		if lhst.IsIntVector() && rhst.IsIntVector() && lhst.VectorElementCount() == rhst.VectorElementCount() {
+			return lhst, true
+		}
+		return Type{}, false
+	}
+
 	if op == AndAnd || op == OrOr {
 		if lhst.Main == Bool && rhst.Main == Bool {
 			return Type{Main: Bool}, true

internal/shaderir/program.go

@@ -16,6 +16,7 @@
 package shaderir
 
 import (
+	"go/ast"
 	"go/constant"
 	"go/token"
 	"sort"
@@ -74,16 +75,17 @@ type Block struct {
 }
 
 type Stmt struct {
-	Type        StmtType
+	Type          StmtType
-	Exprs       []Expr
+	Exprs         []Expr
-	Blocks      []*Block
+	Blocks        []*Block
-	ForVarType  Type
+	ForVarType    Type
-	ForVarIndex int
+	ForVarIndex   int
-	ForInit     constant.Value
+	ForInit       constant.Value
-	ForEnd      constant.Value
+	ForEnd        constant.Value
-	ForOp       Op
+	ForOp         Op
-	ForDelta    constant.Value
+	ForDelta      constant.Value
-	InitIndex   int
+	InitIndex     int
+	IsTypeGuessed bool
 }
 
 type StmtType int
@@ -109,6 +111,7 @@ type Expr struct {
 	Swizzling   string
 	Index       int
 	Op          Op
+	Ast         ast.Expr
 }
 
 type ExprType int