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shader: Check the index is an exact integer

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This commit is contained in:
Hajime Hoshi 2020-08-12 13:05:37 +09:00
parent 6d113e4b0d
commit 39d829d3bf
1 changed files with 8 additions and 0 deletions
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8
internal/shader/expr.go
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@ -25,6 +25,10 @@ import (
"github.com/hajimehoshi/ebiten/internal/shaderir" "github.com/hajimehoshi/ebiten/internal/shaderir"
) )
func canTruncateToInteger(v gconstant.Value) bool {
return gconstant.ToInt(v).Kind() != gconstant.Unknown
}
var textureVariableRe = regexp.MustCompile(`\A__t(\d+)\z`) var textureVariableRe = regexp.MustCompile(`\A__t(\d+)\z`)
func (cs *compileState) parseExpr(block *block, expr ast.Expr) ([]shaderir.Expr, []shaderir.Type, []shaderir.Stmt, bool) { func (cs *compileState) parseExpr(block *block, expr ast.Expr) ([]shaderir.Expr, []shaderir.Type, []shaderir.Stmt, bool) {
@ -523,6 +527,10 @@ func (cs *compileState) parseExpr(block *block, expr ast.Expr) ([]shaderir.Expr,
} }
idx := exprs[0] idx := exprs[0]
if idx.Type == shaderir.NumberExpr { if idx.Type == shaderir.NumberExpr {
if !canTruncateToInteger(idx.Const) {
cs.addError(e.Pos(), fmt.Sprintf("constant %s truncated to integer", idx.Const.String()))
return nil, nil, nil, false
}
idx.ConstType = shaderir.ConstTypeInt idx.ConstType = shaderir.ConstTypeInt
} }