mirror of
https://github.com/hajimehoshi/ebiten.git
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108 lines
3.6 KiB
Go
108 lines
3.6 KiB
Go
// Copyright 2023 The Ebitengine 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
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import (
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"go/constant"
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)
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func ResolveUntypedConstsForBinaryOp(lhs, rhs constant.Value, lhst, rhst Type) (newLhs, newRhs constant.Value, ok bool) {
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if lhst.Main == None && rhst.Main == None {
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if lhs.Kind() == rhs.Kind() {
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return lhs, rhs, true
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}
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if lhs.Kind() == constant.Float && constant.ToFloat(rhs).Kind() != constant.Unknown {
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return lhs, constant.ToFloat(rhs), true
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}
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if rhs.Kind() == constant.Float && constant.ToFloat(lhs).Kind() != constant.Unknown {
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return constant.ToFloat(lhs), rhs, true
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}
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if lhs.Kind() == constant.Int && constant.ToInt(rhs).Kind() != constant.Unknown {
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return lhs, constant.ToInt(rhs), true
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}
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if rhs.Kind() == constant.Int && constant.ToInt(lhs).Kind() != constant.Unknown {
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return constant.ToInt(lhs), rhs, true
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}
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return nil, nil, false
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}
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if lhst.Main == None {
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if (rhst.Main == Float || rhst.isFloatVector() || rhst.IsMatrix()) && constant.ToFloat(lhs).Kind() != constant.Unknown {
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return constant.ToFloat(lhs), rhs, true
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}
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if (rhst.Main == Int || rhst.isIntVector()) && constant.ToInt(lhs).Kind() != constant.Unknown {
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return constant.ToInt(lhs), rhs, true
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}
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if rhst.Main == Bool && lhs.Kind() == constant.Bool {
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return lhs, rhs, true
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}
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return nil, nil, false
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}
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if rhst.Main == None {
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if (lhst.Main == Float || lhst.isFloatVector() || lhst.IsMatrix()) && constant.ToFloat(rhs).Kind() != constant.Unknown {
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return lhs, constant.ToFloat(rhs), true
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}
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if (lhst.Main == Int || lhst.isIntVector()) && constant.ToInt(rhs).Kind() != constant.Unknown {
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return lhs, constant.ToInt(rhs), true
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}
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if lhst.Main == Bool && rhs.Kind() == constant.Bool {
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return lhs, rhs, true
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}
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return nil, nil, false
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}
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// lhst and rhst might not match, but this has nothing to do with resolving untyped consts.
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return lhs, rhs, true
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}
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func AreValidTypesForBinaryOp(op Op, lhs, rhs *Expr, lhst, rhst Type) bool {
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if op == AndAnd || op == OrOr {
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return lhst.Main == Bool && rhst.Main == Bool
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}
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if op == VectorEqualOp || op == VectorNotEqualOp {
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return lhst.IsVector() && rhst.IsVector() && lhst.Equal(&rhst)
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}
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// Comparing matrices are forbidden (#2187).
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if op == LessThanOp || op == LessThanEqualOp || op == GreaterThanOp || op == GreaterThanEqualOp || op == EqualOp || op == NotEqualOp {
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if lhst.IsMatrix() || rhst.IsMatrix() {
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return false
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}
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}
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// If both are untyped consts, compare the constants and try to truncate them if necessary.
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if lhst.Main == None && rhst.Main == None {
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// Assume that the constant types are already adjusted.
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if lhs.Const.Kind() != rhs.Const.Kind() {
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panic("shaderir: const types for a binary op must be adjusted")
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}
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// For %, both operands must be integers if both are constants. Truncatable to an integer is not enough.
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if op == ModOp {
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return lhs.Const.Kind() == constant.Int && rhs.Const.Kind() == constant.Int
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}
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return true
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}
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// Both types must not be untyped.
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if lhst.Main == None || rhst.Main == None {
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panic("shaderir: cannot resolve untyped values")
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}
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return lhst.Equal(&rhst)
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}
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