internal/shader: bug fix: stricter type checks for the built-in functions

Closes #2712

internal/shader/expr.go

@@ -291,14 +291,20 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 				}
 			case shaderir.IntF:
 				if len(args) == 1 && args[0].Const != nil {
-					if !canTruncateToInteger(args[0].Const) {
+					var v int64
-						cs.addError(e.Pos(), fmt.Sprintf("cannot convert %s to type int", args[0].Const.String()))
+					switch args[0].Const.Kind() {
-						return nil, nil, nil, false
+					case gconstant.Int:
+						v, _ = gconstant.Int64Val(args[0].Const)
+					case gconstant.Float:
+						fv, _ := gconstant.Float64Val(args[0].Const)
+						v = int64(fv)
+					default:
+						panic("not reached")
 					}
 					return []shaderir.Expr{
 						{
 							Type:      shaderir.NumberExpr,
-							Const:     gconstant.ToInt(args[0].Const),
+							Const:     gconstant.MakeInt64(v),
 							ConstType: shaderir.ConstTypeInt,
 						},
 					}, []shaderir.Type{{Main: shaderir.Int}}, stmts, true
@@ -357,19 +363,19 @@ func (cs *compileState) parseExpr(block *block, fname string, expr ast.Expr, mar
 				}
 				t = shaderir.Type{Main: shaderir.Vec4}
 			case shaderir.IVec2F:
-				if err := checkArgsForVec2BuiltinFunc(args, argts); err != nil {
+				if err := checkArgsForIVec2BuiltinFunc(args, argts); err != nil {
 					cs.addError(e.Pos(), err.Error())
 					return nil, nil, nil, false
 				}
 				t = shaderir.Type{Main: shaderir.IVec2}
 			case shaderir.IVec3F:
-				if err := checkArgsForVec3BuiltinFunc(args, argts); err != nil {
+				if err := checkArgsForIVec3BuiltinFunc(args, argts); err != nil {
 					cs.addError(e.Pos(), err.Error())
 					return nil, nil, nil, false
 				}
 				t = shaderir.Type{Main: shaderir.IVec3}
 			case shaderir.IVec4F:
-				if err := checkArgsForVec4BuiltinFunc(args, argts); err != nil {
+				if err := checkArgsForIVec4BuiltinFunc(args, argts); err != nil {
 					cs.addError(e.Pos(), err.Error())
 					return nil, nil, nil, false
 				}

internal/shader/syntax_test.go

@@ -1653,8 +1653,8 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "i := 1.0; a := vec3(i, i, i); _ = a", err: false},
 		{stmt: "a := vec3(vec2(1), 1); _ = a", err: false},
 		{stmt: "a := vec3(1, vec2(1)); _ = a", err: false},
-		{stmt: "a := vec3(ivec2(1), 1); _ = a", err: false},
+		{stmt: "a := vec3(ivec2(1), 1); _ = a", err: true},
-		{stmt: "a := vec3(1, ivec2(1)); _ = a", err: false},
+		{stmt: "a := vec3(1, ivec2(1)); _ = a", err: true},
 		{stmt: "a := vec3(vec3(1), 1); _ = a", err: true},
 		{stmt: "a := vec3(1, vec3(1)); _ = a", err: true},
 		{stmt: "a := vec3(vec3(1), vec3(1), vec3(1)); _ = a", err: true},
@@ -1678,15 +1678,15 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "i := 1.0; a := vec4(i, i, i, i); _ = a", err: false},
 		{stmt: "a := vec4(vec2(1), 1, 1); _ = a", err: false},
 		{stmt: "a := vec4(1, vec2(1), 1); _ = a", err: false},
-		{stmt: "a := vec4(ivec2(1), 1, 1); _ = a", err: false},
+		{stmt: "a := vec4(ivec2(1), 1, 1); _ = a", err: true},
-		{stmt: "a := vec4(1, ivec2(1), 1); _ = a", err: false},
+		{stmt: "a := vec4(1, ivec2(1), 1); _ = a", err: true},
 		{stmt: "a := vec4(1, 1, vec2(1)); _ = a", err: false},
 		{stmt: "a := vec4(vec2(1), vec2(1)); _ = a", err: false},
-		{stmt: "a := vec4(ivec2(1), ivec2(1)); _ = a", err: false},
+		{stmt: "a := vec4(ivec2(1), ivec2(1)); _ = a", err: true},
 		{stmt: "a := vec4(vec3(1), 1); _ = a", err: false},
 		{stmt: "a := vec4(1, vec3(1)); _ = a", err: false},
-		{stmt: "a := vec4(ivec3(1), 1); _ = a", err: false},
+		{stmt: "a := vec4(ivec3(1), 1); _ = a", err: true},
-		{stmt: "a := vec4(1, ivec3(1)); _ = a", err: false},
+		{stmt: "a := vec4(1, ivec3(1)); _ = a", err: true},
 		{stmt: "a := vec4(vec4(1), 1); _ = a", err: true},
 		{stmt: "a := vec4(1, vec4(1)); _ = a", err: true},
 		{stmt: "a := vec4(vec4(1), vec4(1), vec4(1), vec4(1)); _ = a", err: true},
@@ -1695,7 +1695,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := ivec2(1); _ = a", err: false},
 		{stmt: "a := ivec2(1.0); _ = a", err: false},
 		{stmt: "i := 1; a := ivec2(i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec2(i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec2(i); _ = a", err: true},
 		{stmt: "a := ivec2(vec2(1)); _ = a", err: false},
 		{stmt: "a := ivec2(vec3(1)); _ = a", err: true},
 		{stmt: "a := ivec2(ivec2(1)); _ = a", err: false},
@@ -1704,7 +1704,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := ivec2(1, 1); _ = a", err: false},
 		{stmt: "a := ivec2(1.0, 1.0); _ = a", err: false},
 		{stmt: "i := 1; a := ivec2(i, i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec2(i, i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec2(i, i); _ = a", err: true},
 		{stmt: "a := ivec2(vec2(1), 1); _ = a", err: true},
 		{stmt: "a := ivec2(1, vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec2(ivec2(1), 1); _ = a", err: true},
@@ -1714,9 +1714,9 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 
 		{stmt: "a := ivec3(1); _ = a", err: false},
 		{stmt: "a := ivec3(1.0); _ = a", err: false},
-		{stmt: "a := ivec3(1.1); _ = a", err: false},
+		{stmt: "a := ivec3(1.1); _ = a", err: true},
 		{stmt: "i := 1; a := ivec3(i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec3(i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec3(i); _ = a", err: true},
 		{stmt: "a := ivec3(vec3(1)); _ = a", err: false},
 		{stmt: "a := ivec3(vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec3(vec4(1)); _ = a", err: true},
@@ -1726,11 +1726,11 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 
 		{stmt: "a := ivec3(1, 1, 1); _ = a", err: false},
 		{stmt: "a := ivec3(1.0, 1.0, 1.0); _ = a", err: false},
-		{stmt: "a := ivec3(1.1, 1.1, 1.1); _ = a", err: false},
+		{stmt: "a := ivec3(1.1, 1.1, 1.1); _ = a", err: true},
 		{stmt: "i := 1; a := ivec3(i, i, i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec3(i, i, i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec3(i, i, i); _ = a", err: true},
-		{stmt: "a := ivec3(vec2(1), 1); _ = a", err: false},
+		{stmt: "a := ivec3(vec2(1), 1); _ = a", err: true},
-		{stmt: "a := ivec3(1, vec2(1)); _ = a", err: false},
+		{stmt: "a := ivec3(1, vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec3(ivec2(1), 1); _ = a", err: false},
 		{stmt: "a := ivec3(1, ivec2(1)); _ = a", err: false},
 		{stmt: "a := ivec3(vec3(1), 1); _ = a", err: true},
@@ -1741,7 +1741,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := ivec4(1); _ = a", err: false},
 		{stmt: "a := ivec4(1.0); _ = a", err: false},
 		{stmt: "i := 1; a := ivec4(i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec4(i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec4(i); _ = a", err: true},
 		{stmt: "a := ivec4(vec4(1)); _ = a", err: false},
 		{stmt: "a := ivec4(vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec4(vec3(1)); _ = a", err: true},
@@ -1751,19 +1751,19 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 
 		{stmt: "a := ivec4(1, 1, 1, 1); _ = a", err: false},
 		{stmt: "a := ivec4(1.0, 1.0, 1.0, 1.0); _ = a", err: false},
-		{stmt: "a := ivec4(1.1, 1.1, 1.1, 1.1); _ = a", err: false},
+		{stmt: "a := ivec4(1.1, 1.1, 1.1, 1.1); _ = a", err: true},
 		{stmt: "i := 1; a := ivec4(i, i, i, i); _ = a", err: false},
-		{stmt: "i := 1.0; a := ivec4(i, i, i, i); _ = a", err: false},
+		{stmt: "i := 1.0; a := ivec4(i, i, i, i); _ = a", err: true},
-		{stmt: "a := ivec4(vec2(1), 1, 1); _ = a", err: false},
+		{stmt: "a := ivec4(vec2(1), 1, 1); _ = a", err: true},
-		{stmt: "a := ivec4(1, vec2(1), 1); _ = a", err: false},
+		{stmt: "a := ivec4(1, vec2(1), 1); _ = a", err: true},
-		{stmt: "a := ivec4(1, 1, vec2(1)); _ = a", err: false},
+		{stmt: "a := ivec4(1, 1, vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec4(ivec2(1), 1, 1); _ = a", err: false},
 		{stmt: "a := ivec4(1, ivec2(1), 1); _ = a", err: false},
 		{stmt: "a := ivec4(1, 1, ivec2(1)); _ = a", err: false},
-		{stmt: "a := ivec4(vec2(1), vec2(1)); _ = a", err: false},
+		{stmt: "a := ivec4(vec2(1), vec2(1)); _ = a", err: true},
 		{stmt: "a := ivec4(ivec2(1), ivec2(1)); _ = a", err: false},
-		{stmt: "a := ivec4(vec3(1), 1); _ = a", err: false},
+		{stmt: "a := ivec4(vec3(1), 1); _ = a", err: true},
-		{stmt: "a := ivec4(1, vec3(1)); _ = a", err: false},
+		{stmt: "a := ivec4(1, vec3(1)); _ = a", err: true},
 		{stmt: "a := ivec4(ivec3(1), 1); _ = a", err: false},
 		{stmt: "a := ivec4(1, ivec3(1)); _ = a", err: false},
 		{stmt: "a := ivec4(vec4(1), 1); _ = a", err: true},
@@ -1782,7 +1782,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := mat2(mat4(1)); _ = a", err: true},
 
 		{stmt: "a := mat2(vec2(1), vec2(1)); _ = a", err: false},
-		{stmt: "a := mat2(ivec2(1), ivec2(1)); _ = a", err: false},
+		{stmt: "a := mat2(ivec2(1), ivec2(1)); _ = a", err: true},
 		{stmt: "a := mat2(1, 1); _ = a", err: true},
 		{stmt: "a := mat2(1, vec2(1)); _ = a", err: true},
 		{stmt: "a := mat2(vec2(1), vec3(1)); _ = a", err: true},
@@ -1810,7 +1810,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := mat3(mat4(1)); _ = a", err: true},
 
 		{stmt: "a := mat3(vec3(1), vec3(1), vec3(1)); _ = a", err: false},
-		{stmt: "a := mat3(ivec3(1), ivec3(1), ivec3(1)); _ = a", err: false},
+		{stmt: "a := mat3(ivec3(1), ivec3(1), ivec3(1)); _ = a", err: true},
 		{stmt: "a := mat3(1, 1, 1); _ = a", err: true},
 		{stmt: "a := mat3(1, 1, vec3(1)); _ = a", err: true},
 		{stmt: "a := mat3(vec3(1), vec3(1), vec4(1)); _ = a", err: true},
@@ -1838,7 +1838,7 @@ func TestSyntaxConstructorFuncType(t *testing.T) {
 		{stmt: "a := mat4(mat3(1)); _ = a", err: true},
 
 		{stmt: "a := mat4(vec4(1), vec4(1), vec4(1), vec4(1)); _ = a", err: false},
-		{stmt: "a := mat4(ivec4(1), ivec4(1), ivec4(1), ivec4(1)); _ = a", err: false},
+		{stmt: "a := mat4(ivec4(1), ivec4(1), ivec4(1), ivec4(1)); _ = a", err: true},
 		{stmt: "a := mat4(1, 1, 1, 1); _ = a", err: true},
 		{stmt: "a := mat4(1, 1, 1, vec4(1)); _ = a", err: true},
 		{stmt: "a := mat4(vec4(1), vec4(1), vec4(1), vec2(1)); _ = a", err: true},
@@ -3341,3 +3341,40 @@ func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
 		}
 	}
 }
+
+// Issue #2712
+func TestSyntaxCast(t *testing.T) {
+	cases := []struct {
+		stmt string
+		err  bool
+	}{
+		{stmt: "a := int(1); _ = a", err: false},
+		{stmt: "a := int(1.0); _ = a", err: false},
+		{stmt: "a := int(1.1); _ = a", err: false},
+		{stmt: "a := float(1); _ = a", err: false},
+		{stmt: "a := float(1.0); _ = a", err: false},
+		{stmt: "a := float(1.1); _ = a", err: false},
+		{stmt: "a := 1; _ = int(a)", err: false},
+		{stmt: "a := 1.0; _ = int(a)", err: false},
+		{stmt: "a := 1.1; _ = int(a)", err: false},
+		{stmt: "a := 1; _ = float(a)", err: false},
+		{stmt: "a := 1.0; _ = float(a)", err: false},
+		{stmt: "a := 1.1; _ = float(a)", err: false},
+	}
+
+	for _, c := range cases {
+		stmt := c.stmt
+		src := fmt.Sprintf(`package main
+
+func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
+	%s
+	return position
+}`, stmt)
+		_, err := compileToIR([]byte(src))
+		if err == nil && c.err {
+			t.Errorf("%s must return an error but does not", stmt)
+		} else if err != nil && !c.err {
+			t.Errorf("%s must not return nil but returned %v", stmt, err)
+		}
+	}
+}

internal/shader/type.go

@@ -106,13 +106,17 @@ func (cs *compileState) parseType(block *block, fname string, expr ast.Expr) (sh
 	}
 }
 
-func canBeFloatImplicitly(expr shaderir.Expr, t shaderir.Type) bool {
+func canBeFloat(expr shaderir.Expr, t shaderir.Type) bool {
-	if expr.Const != nil && canTruncateToFloat(expr.Const) {
+	if expr.Const != nil {
-		return true
+		if t.Main == shaderir.Float {
+			return true
+		}
+		if canTruncateToFloat(expr.Const) {
+			return true
+		}
+		return false
 	}
 
-	// canBeFloatImplicitly is used for a cast-like functions like float() or vec2().
-	// A non-constant integer value is acceptable.
 	if t.Main == shaderir.Int {
 		return true
 	}
@@ -122,6 +126,23 @@ func canBeFloatImplicitly(expr shaderir.Expr, t shaderir.Type) bool {
 	return false
 }
 
+func canBeInt(expr shaderir.Expr, t shaderir.Type) bool {
+	if expr.Const != nil {
+		if t.Main == shaderir.Float {
+			return true
+		}
+		if canTruncateToInteger(expr.Const) {
+			return true
+		}
+		return false
+	}
+
+	if t.Main == shaderir.Int {
+		return true
+	}
+	return false
+}
+
 func checkArgsForBoolBuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) error {
 	if len(args) != len(argts) {
 		return fmt.Errorf("the number of arguments and types doesn't match: %d vs %d", len(args), len(argts))
@@ -150,7 +171,7 @@ func checkArgsForIntBuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) err
 	if argts[0].Main == shaderir.Int || argts[0].Main == shaderir.Float {
 		return nil
 	}
-	if args[0].Const != nil && canTruncateToInteger(args[0].Const) {
+	if args[0].Const != nil && (args[0].Const.Kind() == gconstant.Float || args[0].Const.Kind() == gconstant.Int) {
 		return nil
 	}
 	return fmt.Errorf("invalid arguments for int: (%s)", argts[0].String())
@@ -164,7 +185,10 @@ func checkArgsForFloatBuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) e
 	if len(args) != 1 {
 		return fmt.Errorf("number of float's arguments must be 1 but %d", len(args))
 	}
-	if canBeFloatImplicitly(args[0], argts[0]) {
+	if argts[0].Main == shaderir.Int || argts[0].Main == shaderir.Float {
+		return nil
+	}
+	if args[0].Const != nil && (args[0].Const.Kind() == gconstant.Float || args[0].Const.Kind() == gconstant.Int) {
 		return nil
 	}
 	return fmt.Errorf("invalid arguments for float: (%s)", argts[0].String())
@@ -177,14 +201,15 @@ func checkArgsForVec2BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
+		// Allow any vectors to perform a cast-like function.
 		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 {
 			return nil
 		}
 	case 2:
-		if canBeFloatImplicitly(args[0], argts[0]) && canBeFloatImplicitly(args[1], argts[1]) {
+		if canBeFloat(args[0], argts[0]) && canBeFloat(args[1], argts[1]) {
 			return nil
 		}
 	default:
@@ -205,21 +230,22 @@ func checkArgsForVec3BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
+		// Allow any vectors to perform a cast-like function.
 		if argts[0].IsVector() && argts[0].VectorElementCount() == 3 {
 			return nil
 		}
 	case 2:
-		if canBeFloatImplicitly(args[0], argts[0]) && argts[1].IsVector() && argts[1].VectorElementCount() == 2 {
+		if canBeFloat(args[0], argts[0]) && argts[1].IsFloatVector() && argts[1].VectorElementCount() == 2 {
 			return nil
 		}
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 && canBeFloatImplicitly(args[1], argts[1]) {
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 2 && canBeFloat(args[1], argts[1]) {
 			return nil
 		}
 	case 3:
-		if canBeFloatImplicitly(args[0], argts[0]) && canBeFloatImplicitly(args[1], argts[1]) && canBeFloatImplicitly(args[2], argts[2]) {
+		if canBeFloat(args[0], argts[0]) && canBeFloat(args[1], argts[1]) && canBeFloat(args[2], argts[2]) {
 			return nil
 		}
 	default:
@@ -240,34 +266,35 @@ func checkArgsForVec4BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
+		// Allow any vectors to perform a cast-like function.
 		if argts[0].IsVector() && argts[0].VectorElementCount() == 4 {
 			return nil
 		}
 	case 2:
-		if canBeFloatImplicitly(args[0], argts[0]) && argts[1].IsVector() && argts[1].VectorElementCount() == 3 {
+		if canBeFloat(args[0], argts[0]) && argts[1].IsFloatVector() && argts[1].VectorElementCount() == 3 {
 			return nil
 		}
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 && argts[1].IsVector() && argts[1].VectorElementCount() == 2 {
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 2 && argts[1].IsFloatVector() && argts[1].VectorElementCount() == 2 {
 			return nil
 		}
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 3 && canBeFloatImplicitly(args[1], argts[1]) {
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 3 && canBeFloat(args[1], argts[1]) {
 			return nil
 		}
 	case 3:
-		if canBeFloatImplicitly(args[0], argts[0]) && canBeFloatImplicitly(args[1], argts[1]) && argts[2].IsVector() && argts[2].VectorElementCount() == 2 {
+		if canBeFloat(args[0], argts[0]) && canBeFloat(args[1], argts[1]) && argts[2].IsFloatVector() && argts[2].VectorElementCount() == 2 {
 			return nil
 		}
-		if canBeFloatImplicitly(args[0], argts[0]) && argts[1].IsVector() && argts[1].VectorElementCount() == 2 && canBeFloatImplicitly(args[2], argts[2]) {
+		if canBeFloat(args[0], argts[0]) && argts[1].IsFloatVector() && argts[1].VectorElementCount() == 2 && canBeFloat(args[2], argts[2]) {
 			return nil
 		}
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 && canBeFloatImplicitly(args[1], argts[1]) && canBeFloatImplicitly(args[2], argts[2]) {
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 2 && canBeFloat(args[1], argts[1]) && canBeFloat(args[2], argts[2]) {
 			return nil
 		}
 	case 4:
-		if canBeFloatImplicitly(args[0], argts[0]) && canBeFloatImplicitly(args[1], argts[1]) && canBeFloatImplicitly(args[2], argts[2]) && canBeFloatImplicitly(args[3], argts[3]) {
+		if canBeFloat(args[0], argts[0]) && canBeFloat(args[1], argts[1]) && canBeFloat(args[2], argts[2]) && canBeFloat(args[3], argts[3]) {
 			return nil
 		}
 	default:
@@ -281,6 +308,120 @@ func checkArgsForVec4BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 	return fmt.Errorf("invalid arguments for vec4: (%s)", strings.Join(str, ", "))
 }
 
+func checkArgsForIVec2BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) error {
+	if len(args) != len(argts) {
+		return fmt.Errorf("the number of arguments and types doesn't match: %d vs %d", len(args), len(argts))
+	}
+
+	switch len(args) {
+	case 1:
+		if canBeInt(args[0], argts[0]) {
+			return nil
+		}
+		// Allow any vectors to perform a cast-like function.
+		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 {
+			return nil
+		}
+	case 2:
+		if canBeInt(args[0], argts[0]) && canBeInt(args[1], argts[1]) {
+			return nil
+		}
+	default:
+		return fmt.Errorf("invalid number of arguments for vec2")
+	}
+
+	var str []string
+	for _, t := range argts {
+		str = append(str, t.String())
+	}
+	return fmt.Errorf("invalid arguments for ivec2: (%s)", strings.Join(str, ", "))
+}
+
+func checkArgsForIVec3BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) error {
+	if len(args) != len(argts) {
+		return fmt.Errorf("the number of arguments and types doesn't match: %d vs %d", len(args), len(argts))
+	}
+
+	switch len(args) {
+	case 1:
+		if canBeInt(args[0], argts[0]) {
+			return nil
+		}
+		// Allow any vectors to perform a cast-like function.
+		if argts[0].IsVector() && argts[0].VectorElementCount() == 3 {
+			return nil
+		}
+	case 2:
+		if canBeInt(args[0], argts[0]) && argts[1].IsIntVector() && argts[1].VectorElementCount() == 2 {
+			return nil
+		}
+		if argts[0].IsIntVector() && argts[0].VectorElementCount() == 2 && canBeInt(args[1], argts[1]) {
+			return nil
+		}
+	case 3:
+		if canBeInt(args[0], argts[0]) && canBeInt(args[1], argts[1]) && canBeInt(args[2], argts[2]) {
+			return nil
+		}
+	default:
+		return fmt.Errorf("invalid number of arguments for vec3")
+	}
+
+	var str []string
+	for _, t := range argts {
+		str = append(str, t.String())
+	}
+	return fmt.Errorf("invalid arguments for ivec3: (%s)", strings.Join(str, ", "))
+}
+
+func checkArgsForIVec4BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) error {
+	if len(args) != len(argts) {
+		return fmt.Errorf("the number of arguments and types doesn't match: %d vs %d", len(args), len(argts))
+	}
+
+	switch len(args) {
+	case 1:
+		if canBeInt(args[0], argts[0]) {
+			return nil
+		}
+		// Allow any vectors to perform a cast-like function.
+		if argts[0].IsVector() && argts[0].VectorElementCount() == 4 {
+			return nil
+		}
+	case 2:
+		if canBeInt(args[0], argts[0]) && argts[1].IsIntVector() && argts[1].VectorElementCount() == 3 {
+			return nil
+		}
+		if argts[0].IsIntVector() && argts[0].VectorElementCount() == 2 && argts[1].IsIntVector() && argts[1].VectorElementCount() == 2 {
+			return nil
+		}
+		if argts[0].IsIntVector() && argts[0].VectorElementCount() == 3 && canBeInt(args[1], argts[1]) {
+			return nil
+		}
+	case 3:
+		if canBeInt(args[0], argts[0]) && canBeInt(args[1], argts[1]) && argts[2].IsIntVector() && argts[2].VectorElementCount() == 2 {
+			return nil
+		}
+		if canBeInt(args[0], argts[0]) && argts[1].IsIntVector() && argts[1].VectorElementCount() == 2 && canBeInt(args[2], argts[2]) {
+			return nil
+		}
+		if argts[0].IsIntVector() && argts[0].VectorElementCount() == 2 && canBeInt(args[1], argts[1]) && canBeInt(args[2], argts[2]) {
+			return nil
+		}
+	case 4:
+		if canBeInt(args[0], argts[0]) && canBeInt(args[1], argts[1]) && canBeInt(args[2], argts[2]) && canBeInt(args[3], argts[3]) {
+			return nil
+		}
+	default:
+		return fmt.Errorf("invalid number of arguments for vec4")
+	}
+
+	var str []string
+	for _, t := range argts {
+		str = append(str, t.String())
+	}
+	return fmt.Errorf("invalid arguments for ivec4: (%s)", strings.Join(str, ", "))
+}
+
 func checkArgsForMat2BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) error {
 	if len(args) != len(argts) {
 		return fmt.Errorf("the number of arguments and types doesn't match: %d vs %d", len(args), len(argts))
@@ -288,20 +429,20 @@ func checkArgsForMat2BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
 		if argts[0].Main == shaderir.Mat2 {
 			return nil
 		}
 	case 2:
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 2 && argts[1].IsVector() && argts[1].VectorElementCount() == 2 {
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 2 && argts[1].IsFloatVector() && argts[1].VectorElementCount() == 2 {
 			return nil
 		}
 	case 4:
 		ok := true
 		for i := range argts {
-			if !canBeFloatImplicitly(args[i], argts[i]) {
+			if !canBeFloat(args[i], argts[i]) {
 				ok = false
 				break
 			}
@@ -327,22 +468,22 @@ func checkArgsForMat3BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
 		if argts[0].Main == shaderir.Mat3 {
 			return nil
 		}
 	case 3:
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 3 &&
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 3 &&
-			argts[1].IsVector() && argts[1].VectorElementCount() == 3 &&
+			argts[1].IsFloatVector() && argts[1].VectorElementCount() == 3 &&
-			argts[2].IsVector() && argts[2].VectorElementCount() == 3 {
+			argts[2].IsFloatVector() && argts[2].VectorElementCount() == 3 {
 			return nil
 		}
 	case 9:
 		ok := true
 		for i := range argts {
-			if !canBeFloatImplicitly(args[i], argts[i]) {
+			if !canBeFloat(args[i], argts[i]) {
 				ok = false
 				break
 			}
@@ -368,23 +509,23 @@ func checkArgsForMat4BuiltinFunc(args []shaderir.Expr, argts []shaderir.Type) er
 
 	switch len(args) {
 	case 1:
-		if canBeFloatImplicitly(args[0], argts[0]) {
+		if canBeFloat(args[0], argts[0]) {
 			return nil
 		}
 		if argts[0].Main == shaderir.Mat4 {
 			return nil
 		}
 	case 4:
-		if argts[0].IsVector() && argts[0].VectorElementCount() == 4 &&
+		if argts[0].IsFloatVector() && argts[0].VectorElementCount() == 4 &&
-			argts[1].IsVector() && argts[1].VectorElementCount() == 4 &&
+			argts[1].IsFloatVector() && argts[1].VectorElementCount() == 4 &&
-			argts[2].IsVector() && argts[2].VectorElementCount() == 4 &&
+			argts[2].IsFloatVector() && argts[2].VectorElementCount() == 4 &&
-			argts[3].IsVector() && argts[3].VectorElementCount() == 4 {
+			argts[3].IsFloatVector() && argts[3].VectorElementCount() == 4 {
 			return nil
 		}
 	case 16:
 		ok := true
 		for i := range argts {
-			if !canBeFloatImplicitly(args[i], argts[i]) {
+			if !canBeFloat(args[i], argts[i]) {
 				ok = false
 				break
 			}

internal/shaderir/check.go

@@ -39,10 +39,10 @@ func ResolveUntypedConstsForBinaryOp(lhs, rhs constant.Value, lhst, rhst Type) (
 	}
 
 	if lhst.Main == None {
-		if (rhst.Main == Float || rhst.isFloatVector() || rhst.IsMatrix()) && constant.ToFloat(lhs).Kind() != constant.Unknown {
+		if (rhst.Main == Float || rhst.IsFloatVector() || rhst.IsMatrix()) && constant.ToFloat(lhs).Kind() != constant.Unknown {
 			return constant.ToFloat(lhs), rhs, true
 		}
-		if (rhst.Main == Int || rhst.isIntVector()) && constant.ToInt(lhs).Kind() != constant.Unknown {
+		if (rhst.Main == Int || rhst.IsIntVector()) && constant.ToInt(lhs).Kind() != constant.Unknown {
 			return constant.ToInt(lhs), rhs, true
 		}
 		if rhst.Main == Bool && lhs.Kind() == constant.Bool {
@@ -52,10 +52,10 @@ func ResolveUntypedConstsForBinaryOp(lhs, rhs constant.Value, lhst, rhst Type) (
 	}
 
 	if rhst.Main == None {
-		if (lhst.Main == Float || lhst.isFloatVector() || lhst.IsMatrix()) && constant.ToFloat(rhs).Kind() != constant.Unknown {
+		if (lhst.Main == Float || lhst.IsFloatVector() || lhst.IsMatrix()) && constant.ToFloat(rhs).Kind() != constant.Unknown {
 			return lhs, constant.ToFloat(rhs), true
 		}
-		if (lhst.Main == Int || lhst.isIntVector()) && constant.ToInt(rhs).Kind() != constant.Unknown {
+		if (lhst.Main == Int || lhst.IsIntVector()) && constant.ToInt(rhs).Kind() != constant.Unknown {
 			return lhs, constant.ToInt(rhs), true
 		}
 		if lhst.Main == Bool && rhs.Kind() == constant.Bool {
@@ -122,7 +122,7 @@ func AreValidTypesForBinaryOp(op Op, lhs, rhs *Expr, lhst, rhst Type) bool {
 		if lhst.Main == IVec4 && rhst.Main == IVec4 {
 			return true
 		}
-		return (lhst.Main == Int || lhst.isIntVector()) && rhst.Main == Int
+		return (lhst.Main == Int || lhst.IsIntVector()) && rhst.Main == Int
 	}
 
 	if lhst.Equal(&rhst) {
@@ -164,16 +164,16 @@ func AreValidTypesForBinaryOp(op Op, lhs, rhs *Expr, lhst, rhst Type) bool {
 		// fallback
 	}
 
-	if lhst.isFloatVector() && rhst.Main == Float {
+	if lhst.IsFloatVector() && rhst.Main == Float {
 		return true
 	}
-	if rhst.isFloatVector() && lhst.Main == Float {
+	if rhst.IsFloatVector() && lhst.Main == Float {
 		return true
 	}
-	if lhst.isIntVector() && rhst.Main == Int {
+	if lhst.IsIntVector() && rhst.Main == Int {
 		return true
 	}
-	if rhst.isIntVector() && lhst.Main == Int {
+	if rhst.IsIntVector() && lhst.Main == Int {
 		return true
 	}
 

internal/shaderir/type.go

@@ -126,7 +126,7 @@ func (t *Type) IsVector() bool {
 	return false
 }
 
-func (t *Type) isFloatVector() bool {
+func (t *Type) IsFloatVector() bool {
 	switch t.Main {
 	case Vec2, Vec3, Vec4:
 		return true
@@ -134,7 +134,7 @@ func (t *Type) isFloatVector() bool {
 	return false
 }
 
-func (t *Type) isIntVector() bool {
+func (t *Type) IsIntVector() bool {
 	switch t.Main {
 	case IVec2, IVec3, IVec4:
 		return true