Method eval

src/ast/ast_const_folding.cpp:336–351

    };

    vec4f FoldingVisitor::eval ( Expression * expr, bool & failed ) {
        ctx.restart();
        ctx.thisProgram = program;
        auto node = simulateExpression(ctx, expr);
        ctx.restart();
        auto fb = program->folding;
        vec4f result = ctx.evalWithCatch(node);
        program->folding = fb;
        if ( ctx.getException() ) {
            failed = true;
            return v_zero();
        } else {
            failed = false;
            return result;
        }
    }

    ExpressionPtr FoldingVisitor::evalAndFold ( Expression * expr ) {
        if ( expr->type->baseType == Type::tString ) return evalAndFoldString(expr);